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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper I covers general studies.

UPSC Combined Geo-Scientist, Prelims · 2024 · Paper I, General Studies

UPSC Geo-Scientist Prelims 2024 General Studies (Paper I): answer key and solutions

All 120 questions of the 2024 Combined Geo-Scientist Prelims Paper I (general studies), each with the answer and a short explanation in the hint-sheet style: the key fact first, numericals worked with units. Tap a number in the key to jump to the question; every question also has its own page.

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Answer key

Question paper: read or download the 2024 Paper I paper. Solutions are original work by VKC; question paper belongs to UPSC.

Q1Chemistry in everyday life / natural acids

Which one of the following sources contains tartaric acid ?

  1. (a) Lemon juice
  2. (b) Orange juice
  3. (c) Tamarind paste
  4. (d) Vinegar

Answer: (c) Tamarind paste

Tartaric acid is the main acid of tamarind (also grapes). Lemon and orange juice contain citric acid; vinegar contains acetic acid. → (c). Remember: sour milk/curd – lactic acid; apple – malic acid; ant sting – formic acid; tomato – oxalic acid.

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Q2Acids and bases / Lewis concept

Which one among the following statements regarding acids and bases is *not* correct ?

  1. (a) A conjugate base of a strong acid is a weak base.
  2. (b) In aqueous solution, the hydroxide ion is hydrated to give several ionic species like H₃O₂⁻, H₅O₃⁻ and H₇O₄⁻ etc.
  3. (c) AlCl₃ is an electron deficient compound, and can act as a Lewis base.
  4. (d) Fluoride ion acts as a Lewis base as it can donate any one of its four electron lone pairs.

Answer and explanation with the VKC plan

Q3Atomic structure / dual nature

Which one of the following experiments explains the wave nature of electromagnetic radiation ?

  1. (a) Black-body radiation
  2. (b) Photoelectric effect
  3. (c) Rutherford's scattering experiment
  4. (d) Diffraction of light

Answer and explanation with the VKC plan

Q4Atomic structure / electronic configuration

Which one among the following is the correct ground state electronic configuration of Cr atom ?

  1. (a) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁴ 4s²
  2. (b) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹
  3. (c) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s⁰
  4. (d) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d³ 4s²

Answer and explanation with the VKC plan

Q5Periodic table / history

Who among the following scientists developed the Modern Periodic Table ?

  1. (a) Henry Moseley
  2. (b) Dmitri Ivanovich Mendeleev
  3. (c) John Alexander Newlands
  4. (d) Johann Döbereiner

Answer and explanation with the VKC plan

Q6Periodic table / classification

Which one of the following blocks of elements is called 'Representative elements' ?

  1. (a) s-block elements only
  2. (b) f-block elements only
  3. (c) d-block elements only
  4. (d) p-block elements together with s-block elements

Answer and explanation with the VKC plan

Q7World geography / Africa

Which of the following statements regarding Mount Kilimanjaro in Africa is/are correct ?

  1. It is situated on the Equator.
  2. It is the highest free standing mountain in the world.

Select the answer using the code given below :

  1. (a) 1 only
  2. (b) 2 only
  3. (c) Both 1 and 2
  4. (d) Neither 1 nor 2

Answer and explanation with the VKC plan

Q8World geography / Central Asia

Aral Sea in Central Asia is situated along which of the following two countries ?

  1. (a) Kazakhstan and Kyrgyzstan
  2. (b) Kazakhstan and Uzbekistan
  3. (c) Uzbekistan and Turkmenistan
  4. (d) Uzbekistan and Kyrgyzstan

Answer and explanation with the VKC plan

Q9World geography / islands

Which of the following statements regarding Galápagos Islands in the Pacific Ocean is/are correct ?

  1. They are formed due to volcanic activity.
  2. They are part of the South American nation Peru.

Select the answer using the code given below :

  1. (a) 1 only
  2. (b) 2 only
  3. (c) Both 1 and 2
  4. (d) Neither 1 nor 2

Answer and explanation with the VKC plan

Q10Ancient history / sites

The ancient city of Taxila is situated in which one among the following provinces of Pakistan ?

  1. (a) Baluchistan
  2. (b) Khyber Pakhtunkhwa
  3. (c) Punjab
  4. (d) Sindh

Answer and explanation with the VKC plan

Q11World geography / latitudes and longitudes

The Prime Meridian (zero degree longitude) does *not* pass through which of the following country/countries ?

  1. England
  2. France
  3. Portugal
  4. Scotland

Select the correct answer using the code given below :

  1. (a) 1 and 2
  2. (b) 2 and 3
  3. (c) 3 and 4
  4. (d) 3 only

Answer and explanation with the VKC plan

Q12Biology / transport

Which one of the following processes describes the movement of particles or molecules from a region of higher concentration to a region of lower concentration ?

  1. (a) Diffusion
  2. (b) Osmosis
  3. (c) Plasmolysis
  4. (d) Deplasmolysis

Answer and explanation with the VKC plan

Q13Plant physiology / water absorption

Which among the following correctly shows the pathway of water movement in a root ?

  1. (a) Pericycle → Endodermis → Cortex → Epidermis
  2. (b) Epidermis → Pericycle → Endodermis → Cortex
  3. (c) Epidermis → Endodermis → Cortex → Pericycle
  4. (d) Epidermis → Cortex → Endodermis → Pericycle

Answer and explanation with the VKC plan

Q14Plant physiology / tropisms

After few days of sowing of maize seeds in the soil, irrespective of their position, the radicle always grows downwards, whereas the coleoptile always grows upwards. This phenomenon is known as :

  1. (a) Phototropism
  2. (b) Hydrotropism
  3. (c) Chemotropism
  4. (d) Geotropism

Answer and explanation with the VKC plan

Q15Biology / vegetative propagation

Which one of the following is the technique of joining parts of two plants to form a composite plant ?

  1. (a) Layering
  2. (b) Grafting
  3. (c) Cutting
  4. (d) Budding

Answer and explanation with the VKC plan

Q16Plant anatomy / vascular bundles

Which one of the following statements is/are correct for a vascular bundle in which xylem and phloem are jointly situated along the same radius ?

  1. These are called conjoint vascular bundles.
  2. Cambium may be present in such vascular bundles.
  3. Conjoint vascular bundles are always of closed type.

Select the answer using the code given below :

  1. (a) 1 only
  2. (b) 1 and 2 only
  3. (c) 2 and 3 only
  4. (d) 1, 2 and 3

Answer and explanation with the VKC plan

Q17Modern history / Revolt of 1857

Match List I with List II and select the correct answer using the code given below the Lists :

List I (Book)List II (Author)
P. Eighteen Fifty-seven1. S.N. Sen
Q. Civil Rebellion in the Indian Mutinies (1857 – 1859)2. R.C. Majumdar
R. The Sepoy Mutiny and the Revolt of 18573. S.B. Chaudhuri
S. Awadh in Revolt, 1857 – 18584. Rudrangshu Mukherjee

Code :

  1. (a) P-1, Q-2, R-3, S-4
  2. (b) P-4, Q-3, R-2, S-1
  3. (c) P-4, Q-2, R-3, S-1
  4. (d) P-1, Q-3, R-2, S-4

Answer and explanation with the VKC plan

Q18Medieval history / Vijayanagara (Hampi)

Which among the following statements about Vijayanagara are correct ?

  1. Colin Mackenzie was the first Surveyor General of India to visit Vijayanagara.
  2. John Marshall was the first to take detailed photographs of the site.
  3. James Burgess was the first to undertake conservation of Hampi.

Select the answer using the code given below :

  1. (a) 1 only
  2. (b) 2 and 3 only
  3. (c) 1, 2 and 3
  4. (d) 1 and 2

Answer and explanation with the VKC plan

Q19Medieval history / foreign travellers

Match List I with List II and select the correct answer using the code given below the Lists :

List I (Traveller)List II (Country)
P. Seydi Ali Reis1. Morocco
Q. Ibn Battuta2. Turkey
R. Peter Mundy3. Portugal
S. Duarte Barbosa4. England

Code :

  1. (a) P-2, Q-1, R-4, S-3
  2. (b) P-3, Q-4, R-1, S-2
  3. (c) P-3, Q-1, R-4, S-2
  4. (d) P-2, Q-4, R-1, S-3

Answer and explanation with the VKC plan

Q20Environmental chemistry / ozone depletion

Consider the following statements about Chlorofluorocarbons (CFCs) :

  1. CFCs remain inert in the troposphere but slowly diffuse into the stratosphere.
  2. CFCs in the upper atmosphere are subjected to UV radiations, generating free radical chlorine that immediately reacts with O₃ to form a radical called chlorine monoxide (ClO).
  3. Each ClO can initiate a series of chemical reactions, leading to the destruction of the ozone layer.

How many of the statements given above is/are correct ?

  1. (a) 1
  2. (b) 2
  3. (c) 3
  4. (d) None

Answer and explanation with the VKC plan

Q21Ecology / nitrogen cycle

Nitrogen cycle is one of the most important microorganisms-mediated chemical reactions in aquatic and soil environments. In this context consider the following statements :

  1. Nitrogen fixation is the process of oxidising NH₃ to NO₃⁻.
  2. Nitrification process causes reduction of NO₃ and NO₃⁻, to NO₂⁻, followed by recycling of N₂ to the atmosphere.
  3. Denitrification converts molecular N₂ into a fixed form as an organic nitrogen.

How many of the statements given above is/are correct ?

  1. (a) 1
  2. (b) 2
  3. (c) 3
  4. (d) None

Answer and explanation with the VKC plan

Q22Ecology / biomes

Consider the following statements about different biomes :

  1. Tropical Savanna Biome is a tropical grassland with scattered drought-resistant trees.
  2. Temperate Deciduous Forest Biome is a high altitude region in the Himalayas.
  3. Temperate Coniferous Forest Biome is found in very dry environment where temperature ranges from very cold to very hot.
  4. Tundra Biome is found in polar regions and characterised by the absence of trees, dwarf plants and wet, spongy, and rough upper ground surface.

Which of the statements given above are correct ?

  1. (a) 1 and 2 only
  2. (b) 1, 2 and 4
  3. (c) 2 and 4 only
  4. (d) 1, 3 and 4

Answer and explanation with the VKC plan

Q23Nuclear physics / binding energy

Nucleus ²⁴⁰U, which has a binding energy per nucleon as 7·6 MeV, disintegrates into two nuclei of ¹¹⁹·⁹Sn. Take ¹¹⁹·⁹Sn elements atomic mass number as 120 and binding energy per nucleon as 8·4 MeV. Which one among the following is the correct value of the energy released in the disintegration process ?

  1. (a) 192 MeV
  2. (b) 190 MeV
  3. (c) 188 MeV
  4. (d) 3840 MeV

Answer and explanation with the VKC plan

Q24Mechanics / Atwood machine

A frictionless pulley has a rope of negligible mass passing over it. Blocks of mass 15 kg and 5 kg are attached at the two ends of the rope and held stationary. When the masses are released to move freely, their speed in m s⁻¹, after the rope has slipped by 0·25 m over the pulley, is closest to : (take g = 10·0 m s⁻²)

  1. (a) 5·0
  2. (b) 2·2
  3. (c) 1·6
  4. (d) 1·2

Answer and explanation with the VKC plan

Q25Optics / refraction of EM waves

An electromagnetic wave \(\vec{E} = \vec{E}_0 e^{i[k_0(3x+4y)-\omega t]}\) travelling in air is incident on the x – z plane of a glass slab. The glass slab has a refractive index of 1·5. Which one among the following is the correct direction of propagation of the transmitted electromagnetic wave ?

  1. (a) \(0.4\hat{i} + 0.2\sqrt{21}\,\hat{j}\)
  2. (b) \(0.4\hat{i} - 0.2\sqrt{21}\,\hat{j}\)
  3. (c) \(0.4\hat{i} + \sqrt{21}\,\hat{j}\)
  4. (d) \(0.4\hat{i} - \sqrt{21}\,\hat{j}\)

Answer and explanation with the VKC plan

Q26Electrostatics / boundary conditions

Two dielectric media D1 and D2 have dielectric constants 3 and 2, respectively. They are separated by x – z plane. A uniform electric field \(\vec{E} = 3\hat{i} + 2\hat{j}\) exists in D1. Which one among the following is the correct electric field in D2 at the xz plane ?

  1. (a) \(\vec{E} = 2\hat{j}\)
  2. (b) \(\vec{E} = 3\hat{i} + 3\hat{j}\)
  3. (c) \(\vec{E} = 3\hat{i} - 2\hat{j}\)
  4. (d) \(\vec{E} = 2\hat{i} + 3\hat{j}\)

Answer and explanation with the VKC plan

Q27Electromagnetic waves

At a given point in space, the electric field associated with an electromagnetic wave is given by \(\vec{E} = (2\hat{i} - 1.5\hat{j})e^{i[k_0(3x+4y)-\omega t]}\). At the same point, which one among the following is the correct value of the unit vector (\(\hat{B}\)) of the magnetic field associated with this electromagnetic wave ?

  1. (a) \(-\hat{k}\)
  2. (b) \(1.5\hat{i} + 2\hat{j}\)
  3. (c) \(1.5\hat{i} - 2\hat{j}\)
  4. (d) \(3\hat{i} - 4\hat{j}\)

Answer and explanation with the VKC plan

Q28Polity / CAG

As per the Constitution of India, which one among the following statements is correct ?

  1. (a) The Comptroller and Auditor General of India (CAG) is appointed by the President of India and remains in office during the pleasure of the President of India.
  2. (b) Administrative expenses of the office of the CAG are charged upon the Contingency Fund of India.
  3. (c) The reports of the CAG relating to the accounts of the Union and States are submitted to the President of India.
  4. (d) The President of India shall cause the reports of the CAG relating to the accounts of the Union to be laid before each House of Parliament.

Answer and explanation with the VKC plan

Q29Polity / elections

Which of the following statements is/are correct as per the Constitution of India ?

  1. The Parliament of India has the power to make provisions with respect to delimitation of constituencies.
  2. The validity of a law made by the Parliament of India with respect to delimitation of constituencies shall not be called in question in a court.

Select the answer using the code given below :

  1. (a) 1 only
  2. (b) 2 only
  3. (c) Both 1 and 2
  4. (d) Neither 1 nor 2

Answer and explanation with the VKC plan

Q30Polity / constitutional and statutory bodies

Consider the following statements :

  1. A special provision was made in the Constitution of India by the Constitution (Eighty-ninth Amendment) Act, 2003 to establish the National Commission for Scheduled Tribes.
  2. National Commission for Backward Classes, National Commission for Minorities and National Commission for Scheduled Castes are constitutional bodies.
  3. National Commission for Women is not a constitutional body.

Which of the statements given above is/are *not* correct ?

  1. (a) 1, 2 and 3
  2. (b) 1 and 3 only
  3. (c) 2 only
  4. (d) 3 only

Answer and explanation with the VKC plan

Q31Periodic properties / ionic radii

Which one among the following is the correct arrangement in increasing order of ionic radii of O²⁻, F⁻, Na⁺, Mg²⁺ ?

  1. (a) Mg²⁺ < Na⁺ < F⁻ < O²⁻
  2. (b) O²⁻ < F⁻ < Na⁺ < Mg²⁺
  3. (c) Mg²⁺ < Na⁺ < O²⁻ < F⁻
  4. (d) O²⁻ < F⁻ < Mg²⁺ < Na⁺

Answer and explanation with the VKC plan

Q33Chemical bonding / dipole moment

Which one among the following is the correct arrangement of molecules in increasing order of their dipole moment ?

  1. (a) NF₃ < NH₃ < BF₃
  2. (b) BF₃ < NH₃ < NF₃
  3. (c) BF₃ < NF₃ < NH₃
  4. (d) NF₃ < BF₃ < NH₃

Answer and explanation with the VKC plan

Q34Chemical bonding / VSEPR and hybridisation

Which one of the following represents the correct combination of shape and hybridisation of PF₅ ?

  1. (a) Square pyramidal, dsp³
  2. (b) Trigonal bipyramidal, dsp³
  3. (c) Square pyramidal, sp³d
  4. (d) Trigonal bipyramidal, sp³d

Answer and explanation with the VKC plan

Q35Chemical bonding / MO theory (LCAO)

Which one of the following conditions is *not* correct for the combination of atomic orbitals to form molecular orbitals ?

  1. (a) The combining atomic orbitals must have same or nearly the same energy.
  2. (b) The combining atomic orbitals must show lateral overlap with each other.
  3. (c) The combining atomic orbitals must have the same symmetry about the molecular axis.
  4. (d) The combining atomic orbitals must overlap to the maximum extent.

Answer and explanation with the VKC plan

Q37Coordination compounds / nomenclature

Which one of the following is the IUPAC name of [Ag(NH₃)₂] [Ag(CN)₂] ?

  1. (a) Diammine dicyanidodisilver(I)
  2. (b) Diammine dicyanidodiargentate(I)
  3. (c) Diamminesilver(I) dicyanidoargentate(I)
  4. (d) Dicyanidoargentate(I) diamminesilver(I)

Answer and explanation with the VKC plan

Q38Coordination compounds / isomerism

Which one of the following types of isomerisms is shown by [CoCl₂(en)₂]Cl ?

  1. (a) Optical isomerism only
  2. (b) Geometrical isomerism only
  3. (c) Both ionisation and geometrical isomerisms
  4. (d) Both geometrical and optical isomerisms

Answer and explanation with the VKC plan

Q39Coordination compounds / VBT and magnetism

Which one of the following Ni(II) complexes is diamagnetic and has tetrahedral geometry ?

  1. (a) [NiCl₄]²⁻
  2. (b) [Ni(CO)₄]
  3. (c) [Ni(NH₃)₄]²⁺
  4. (d) [Ni(CN)₄]²⁻

Answer and explanation with the VKC plan

Q40Biogeography / Wallacea

Which one among the following islands in South-East Asia is situated between Wallace's Line and Weber's Line that are related to Bio-diversity ?

  1. (a) Borneo
  2. (b) Celebes (Sulawesi)
  3. (c) Java
  4. (d) New Guinea

Answer and explanation with the VKC plan

Q41Indian geography / natural vegetation

Which of the following statements regarding Tropical Deciduous forests in India is/are correct ?

  1. They are the most widespread forests in India.
  2. They spread over regions which receive annual rainfall between 70 – 200 cm.

Select the answer using the code given below :

  1. (a) 1 only
  2. (b) 2 only
  3. (c) Both 1 and 2
  4. (d) Neither 1 nor 2

Answer and explanation with the VKC plan

Q42Indian geography / agriculture

Which of the following statements regarding groundnut cultivation in India is/are correct ?

  1. Groundnut is a Rabi crop.
  2. Gujarat is an important state for Groundnut cultivation.

Select the answer using the code given below :

  1. (a) 1 only
  2. (b) 2 only
  3. (c) Both 1 and 2
  4. (d) Neither 1 nor 2

Answer and explanation with the VKC plan

Q43Indian geography / minerals

Which two of the following states are the leading producers of Bauxite in India as per the Annual Report of the Ministry of Mines 2022 – 23 ?

  1. Odisha
  2. Chhattisgarh
  3. Jharkhand
  4. Gujarat

Select the answer using the code given below :

  1. (a) 1 and 2
  2. (b) 1 and 3
  3. (c) 1 and 4
  4. (d) 2 and 4

Answer and explanation with the VKC plan

Q44Environment / forest cover

As per the India State of Forest Report 2021, which of the following states has maximum percentage of its geographical area under forest cover ?

  1. (a) Madhya Pradesh
  2. (b) Manipur
  3. (c) Meghalaya
  4. (d) Mizoram

Answer and explanation with the VKC plan

Q45Botany / seed dispersal

Many fruits burst with a sudden jerk because of which the seeds are scattered a few yards from the parent plant. This type of dispersal of seeds is known as :

  1. (a) Anemochory
  2. (b) Hydrochory
  3. (c) Autochory
  4. (d) Zoochory

Answer and explanation with the VKC plan

Q46Health / occupational diseases

Which one among the following diseases is characteristically and specifically linked to asbestosis ?

  1. (a) Liver fibrosis
  2. (b) Lung fibrosis
  3. (c) Mesothelioma
  4. (d) Pleural effusion

Answer and explanation with the VKC plan

Q47Health / vaccines

Which one among the following diseases does *not* yet have any effective vaccine ?

  1. (a) Chicken pox
  2. (b) Typhoid
  3. (c) Viral Hepatitis C
  4. (d) Human Papilloma virus

Answer and explanation with the VKC plan

Q49Genetics / chromosomal disorders

Which one of the following examples of genetic-disorder or disease is due to the numerical abnormalities in the sex chromosome ?

  1. (a) Turner's syndrome
  2. (b) Down's syndrome
  3. (c) Haemophilia
  4. (d) Alkaptonuria

Answer and explanation with the VKC plan

Q50Medieval history / Delhi Sultanate

The two medieval period canals originating from the Sutlej and Yamuna rivers and joining at Karnal were made at the orders of :

  1. (a) Alauddin Khalji
  2. (b) Mohammad Tughlaq
  3. (c) Firuz Tughlaq
  4. (d) Ibrahim Lodi

Answer and explanation with the VKC plan

Q51Medieval history / music

Who among the following has written three works on the science of music called *Sangitaraja*, *Sangita Mimansa* and *Sudha Prabandha* ?

  1. (a) Tansen
  2. (b) Ibrahim Adil Shah
  3. (c) Amir Khusro
  4. (d) Maharana Kumbha of Mewar

Answer and explanation with the VKC plan

Q52Art and culture / Chalukya architecture

Which one among the following temples, constructed by Queen Loka Mahadevi in Pattadakal, is a UNESCO World Heritage site ?

  1. (a) Kailasanatha Temple
  2. (b) Virupaksha Temple
  3. (c) Brihadishvara Temple
  4. (d) Srirangam Temple

Answer and explanation with the VKC plan

Q53Medieval history / Bhakti movement

Which among the following statements is/are correct ?

  1. Nalayira Divyaprabandham is an anthology of Alvar saints' compositions.
  2. Tevaram is the collection of Tamil Shaiva hymns.
  3. Nalayira Divyaprabandham is also described as the Tamil Veda.

Select the answer using the code given below :

  1. (a) 1 and 2 only
  2. (b) 2 and 3 only
  3. (c) 1, 2 and 3
  4. (d) 1 only

Answer and explanation with the VKC plan

Q55Modern history / land revenue

Which one of the following propositions from the book 'History of British India' by James Mill is correct ?

  1. (a) The tax payable by the zamindars should not be more than thirty percent of the total produce
  2. (b) The rights of cultivators should be protected by the State
  3. (c) The State should remain as the landlord and that each peasant should hold land directly from the State as its tenant
  4. (d) Sufficient advances should be given to the peasants so that they are encouraged to cultivate cash crops

Answer and explanation with the VKC plan

Q56Modern history / revolutionary nationalism

In April 1908, Prafulla Chaki and Khudiram Bose threw a bomb at a carriage in Muzaffarpur which they believed to be occupied by Kingsford. Which among the following correctly describes the profession of Kingsford ?

  1. (a) Revenue Officer
  2. (b) Judge
  3. (c) Police Officer
  4. (d) Army Personnel

Answer and explanation with the VKC plan

Q57Environmental chemistry / smog

Which of the following statements about Photochemical Smog is/are correct ?

  1. It irritates the eyes.
  2. It leads to cracking of rubber.
  3. It causes considerable damage to plant life.

Select the answer using the code given below :

  1. (a) 1, 2 and 3
  2. (b) 2 and 3 only
  3. (c) 1 and 2 only
  4. (d) 3 only

Answer and explanation with the VKC plan

Q59Climatology / atmosphere structure

Consider the following combinations of lapse rate in relation to atmospheric region :

  1. Troposphere : Negative lapse rate
  2. Stratosphere : Negative lapse rate
  3. Mesosphere : Negative lapse rate
  4. Thermosphere : Positive lapse rate

How many of the combinations given above is/are correct ?

  1. (a) 1
  2. (b) 2
  3. (c) 3
  4. (d) 4

Answer and explanation with the VKC plan

Q60Climatology / ozone layer

In which sphere of the atmosphere is harmful ultraviolet (UV) radiation from the Sun absorbed ?

  1. (a) Mesosphere
  2. (b) Thermosphere
  3. (c) Troposphere
  4. (d) Stratosphere

Answer and explanation with the VKC plan

Q62Physics / electromagnetic spectrum

Which one of the following sequences of electromagnetic spectrum is correct in terms of ascending wavelength order ?

  1. (a) X-rays – Gamma rays – UV – Infrared – Visible – Microwaves – Radio and TV waves
  2. (b) Gamma rays – X-rays – UV – Infrared – Visible – Microwaves – Radio and TV waves
  3. (c) Gamma rays – X-rays – UV – Visible – Infrared – Microwaves – Radio and TV waves
  4. (d) UV – Gamma rays – X-rays – Visible – Infrared – Microwaves – Radio and TV waves

Answer and explanation with the VKC plan

Q63Hydrogeology / water chemistry

Which one of the following pairs of principal chemical constituents in water and their source is correct ?

  1. (a) Ca : Amphiboles, Feldspars, Gypsum
  2. (b) NO₃ : Apatite, Fluorite, Mica
  3. (c) CO₃ : Feldspars, Clay minerals
  4. (d) F : Dolomite, Gypsum, Anhydrite

Answer and explanation with the VKC plan

Q65Ecology / succession

Which one of the following is the appropriate sequential order of ecological succession ?

  1. (a) Invasion – Nudation – Competition and coaction – Reaction – Stabilization
  2. (b) Nudation – Invasion – Competition and coaction – Reaction – Stabilization
  3. (c) Nudation – Invasion – Reaction – Competition and coaction – Stabilization
  4. (d) Invasion – Nudation – Reaction – Competition and coaction – Stabilization

Answer and explanation with the VKC plan

Q67Electrostatics / E = −dV/dx

In a region, the electric potential varies as shown in the figure. Which one among the following is the correct representation of the magnitude of the associated electric field ?

UPSC Combined Geo-Scientist Prelims 2024 Paper I (General Studies), Q67: figure printed with the question
UPSC Combined Geo-Scientist Prelims 2024 Paper I (General Studies), Q67: answer options as printed
  1. (a) Step graph: E decreases from each region to the next across all five regions
  2. (b) Step graph: E decreases over the first three regions, rises in the fourth, then falls in the fifth
  3. (c) Step graph: E decreases over the first three regions, then rises in the fourth and rises again in the fifth
  4. (d) A graph of the same shape as the potential curve

Answer and explanation with the VKC plan

Q68Electrostatics / conductors in a field

Which one among the following is the correct representation of the electric field when a conducting spherical shell is placed between the plates of a parallel plate capacitor ?

UPSC Combined Geo-Scientist Prelims 2024 Paper I (General Studies), Q68: answer options as printed
  1. (a) Straight parallel field lines passing through the shell undisturbed
  2. (b) Parallel field lines stopping at the shell surface without bending, none inside
  3. (c) Field lines bending to meet the shell surface normally, no field lines inside
  4. (d) Field lines bending towards the shell and also passing through its interior

Answer and explanation with the VKC plan

Q69Thermal physics / Newton's law of cooling

A cup of tea is placed at a table, and the room temperature is 35°C. The tea cools from 90°C to 70°C in 5 minutes. Which one among the following is the correct time taken for the tea to cool from 70°C to 50°C ?

  1. (a) 5 minutes
  2. (b) 7 minutes
  3. (c) 9 minutes
  4. (d) 11 minutes

Answer and explanation with the VKC plan

Q70Thermal physics / energy conversion

An ice bullet of temperature – 10°C is fired upon an object. The bullet spends 20% of its kinetic energy in penetrating into the object and remaining kinetic energy is spent into melting the bullet at 0°C. The latent heat of fusion of ice is 3·4 × 10⁵ J kg⁻¹ and its specific heat capacity is 2000 J kg⁻¹ K⁻¹. Which one among the following is the correct initial speed of the bullet ?

  1. (a) 300√10 m s⁻¹
  2. (b) 3600 m s⁻¹
  3. (c) 300√5 m s⁻¹
  4. (d) 900 m s⁻¹

Answer and explanation with the VKC plan

Q71Thermodynamics / isobaric process

Molar heat capacity at constant pressure of a diatomic gas is 3·5 R, where R is universal gas constant. The gas is heated by providing energy of 1400 J and is allowed to expand isobarically. Which one among the following represents the work done by the gas in this process ?

  1. (a) 400 J
  2. (b) 4900 J
  3. (c) 560 J
  4. (d) 280 J

Answer and explanation with the VKC plan

Q72Optics / lens combinations

The eyepiece of a telescope is a system of two biconvex lenses L1 and L2, of focal length 30 cm and 20 cm respectively, with a separation of 2 cm between them. Lens L2 faces the eye. This eyepiece is to be replaced by a single bi-convex lens L. Which one among the following is the correct combination of the focal length (F in cm) of the lens L and its distance from the position of lens L1 (δ in cm) ?

  1. (a) F = 12·5 and δ = 1·17
  2. (b) F = 12·5 and δ = 1·15
  3. (c) F = 11·5 and δ = 1·17
  4. (d) F = 11·5 and δ = 1·15

Answer and explanation with the VKC plan

Q73Polity / Scheduled Castes (Art. 341)

Consider the following statements :

  1. The President of India may specify a 'race' to be treated under the Scheduled Caste category for all purposes under the Constitution of India.
  2. The President of India may specify a 'tribe' to be treated under the Scheduled Caste category for all purposes under the Constitution of India.
  3. Parliament by law can include a caste or tribe in the list of Scheduled Castes.

How many of the above statements is/are correct ?

  1. (a) 1
  2. (b) 2
  3. (c) 3
  4. (d) None

Answer and explanation with the VKC plan

Q74Polity / official language and minorities

Which one among the following statements is *not* correct as per the Constitution of India ?

  1. (a) National Commission for Minorities appoints a Special Officer for linguistic minorities.
  2. (b) It shall be the duty of the Union to develop the Hindi language as a medium of expression for all the elements of the composite culture of India.
  3. (c) The word 'Hindustani' is mentioned in the Constitution with reference to the enrichment of the Hindi language.
  4. (d) Every state shall endeavour to provide adequate facilities for instruction in the mother-tongue at the primary stage of education to children belonging to minority groups.

Answer and explanation with the VKC plan

Q75Polity / legal maxims

Given below are four legal terms/maxims. Which one of them means 'no man (person) shall be condemned unheard' ?

  1. (a) *Autrefois convict*
  2. (b) *Non bis in idem*
  3. (c) *Habeas Corpus*
  4. (d) *Audi Alteram Partem*

Answer and explanation with the VKC plan

Q76Polity / Third Schedule oaths

Which of the following statements as per the Third Schedule of the Constitution of India is/are correct ?

  1. A Member of Parliament is free to take the oath or affirmation by 'swearing in the name of God'.
  2. Judge of the Supreme Court has to take the oath or affirmation by 'swearing in the name of the Constitution of India'.

Select the answer using the code given below :

  1. (a) 1 only
  2. (b) 2 only
  3. (c) Both 1 and 2
  4. (d) Neither 1 nor 2

Answer and explanation with the VKC plan

Q77Environment / ICFRE institutes

Which of the following pairs of Forest Research Centres and their locations are correctly matched ?

  1. Forest Research Centre for Eco-Rehabilitation : Prayagraj
  2. Forest Research Centre for Livelihood Extension : Shillong
  3. Forest Research Centre for Skill Development : Bhopal
  4. Forest Research Centre for Coastal Ecosystems : Visakhapatnam

Select the answer using the code given below :

  1. (a) 1 and 3
  2. (b) 1 and 4
  3. (c) 2 and 3
  4. (d) 2 and 4

Answer and explanation with the VKC plan

Q79Environment / Ramsar sites

Which of the following pairs is/are *not* correctly matched ?

(Ramsar site)(State)
1. Kolleru lakeTelangana
2. Satkosia gorgeOdisha
3. Kanjli lakePunjab
4. Pala wetlandMizoram

Select the answer using the code given below :

  1. (a) 1 only
  2. (b) 1 and 2
  3. (c) 2 and 3
  4. (d) 4 only

Answer and explanation with the VKC plan

Q80Environment / tiger reserves

Which of the following tiger reserves is/are *not* situated in the state of Rajasthan ?

  1. Mukundra Hills
  2. Ramgarh Vishdhari
  3. Kawal
  4. Bhadra

Select the correct answer using the code given below :

  1. (a) 1 only
  2. (b) 1 and 2
  3. (c) 3 and 4
  4. (d) 4 only

Answer and explanation with the VKC plan

Q81Indian geography / urbanisation

Which of the following statements regarding Urban Population in India as per Census 2011 is/are correct ?

  1. More than 31% of the total population lives in towns.
  2. The number of towns was more than 7500.

Select the answer using the code given below:

  1. (a) 1 only
  2. (b) 2 only
  3. (c) Both 1 and 2
  4. (d) Neither 1 nor 2

Answer and explanation with the VKC plan

Q82Environment / biodiversity conservation

Which one among the following is *not in-situ* conservation ?

  1. (a) Wildlife sanctuary
  2. (b) Botanical garden
  3. (c) Biosphere reserve
  4. (d) National park

Answer and explanation with the VKC plan

Q84Oceanography / coral reefs

Which one of the following types of coral reefs are developed along the edges of continental shelves and separated by lagoon ?

  1. (a) Patch reefs
  2. (b) Fringing reefs
  3. (c) Barrier reefs
  4. (d) Atoll reefs

Answer and explanation with the VKC plan

Q85Soil science / soil horizons

Which one of the following is the correct sequence of a typical soil profile from top to bottom ?

  1. (a) Topsoil, Humus, Eluviation zone, Subsoil, Weathered parent material
  2. (b) Subsoil, Topsoil, Humus, Weathered parent material, Eluviation zone
  3. (c) Humus, Subsoil, Topsoil, Eluviation zone, Weathered parent material
  4. (d) Humus, Topsoil, Eluviation zone, Subsoil, Weathered parent material

Answer and explanation with the VKC plan

Q88Rotational mechanics / axis theorems

A planar, irregular shaped object has a mass of 2 kg. Its moment of inertia along the two orthogonal axes in the plane of the object are 3 kg m² and 4 kg m², respectively. The moment of inertia of the object along an axis perpendicular to the plane and passing through a point 0·5 m away from its centre of mass is represented by *I*. Which one among the following is the correct value of *I* ?

  1. (a) 7·5 kg m²
  2. (b) 7 kg m²
  3. (c) 5 kg m²
  4. (d) 1 kg m²

Answer and explanation with the VKC plan

Q89Mechanics / work-energy theorem

A ball of mass 100 g falls freely from a height of h = 20 m and hits the ground at a speed of 1·4 √gh . Take g = 10 m s⁻². Which one among the following is the correct value of the work done on the ball by air friction ?

  1. (a) 0·4 J
  2. (b) 0·5 J
  3. (c) 0·3 J
  4. (d) 1 J

Answer and explanation with the VKC plan

Q90Kinematics / circular motion

A particle moves in a circle of radius 4 m. Its linear speed is given by 4√3 t, where t is the time measured in seconds. At t = 1 s, the angle made by the resultant acceleration – r̂ with direction (+ r̂ is the radial direction) is given by ϕ. Which one among the following is the correct value of ϕ ?

  1. (a) \(\tan^{-1}\left(\frac{1}{\sqrt{3}}\right)\)
  2. (b) \(\tan^{-1}\left(\frac{1}{\sqrt{2}}\right)\)
  3. (c) \(\tan^{-1}\left(\frac{2}{\sqrt{3}}\right)\)
  4. (d) \(\tan^{-1}(\sqrt{3})\)

Answer and explanation with the VKC plan

Q91Electrostatics / charged conductors

Consider metallic spheres of different radii r, all at the same electrostatic potential. Then the magnitude E of the electric field just outside these spheres depends on r as :

  1. (a) E ∝ r⁻²
  2. (b) E ∝ r⁻¹
  3. (c) E ∝ r⁰
  4. (d) E ∝ r

Answer and explanation with the VKC plan

Q92Magnetism / magnetic moment

Magnetic dipole moment of a square current loop of side 1 cm and carrying a current of 0·10 A is :

  1. (a) 3·14 × 10⁻⁵ A m²
  2. (b) 1·00 × 10⁻⁵ A m²
  3. (c) 6·28 × 10⁻³ A m²
  4. (d) 4·00 × 10⁻³ A m²

Answer and explanation with the VKC plan

Q93Electricity / ionic conduction

Ions in a solution are subject to a uniform electric field. If each ion carries charge q and has radius R, then the ionic current *I* due to the applied field will depend on q and R as :

  1. (a) *I* ∝ qR²
  2. (b) *I* ∝ q²R
  3. (c) *I* ∝ qR⁰
  4. (d) *I* ∝ q²R⁻¹

Answer and explanation with the VKC plan

Q94Thermal physics / calorimetry

100 grams of ice at 0°C is put in 240 grams of water at 5°C. The mixture finally comes to equilibrium at 0°C with m grams of ice having melted in the process. Value of m is close to : (latent heat of ice = 3·33 × 10⁵ J/kg and specific heat of water = 4·2 J g⁻¹ °C)

  1. (a) 0 g
  2. (b) 10 g
  3. (c) 5 g
  4. (d) 15 g

Answer and explanation with the VKC plan

Q95Current electricity / Wheatstone bridge

Shown in the circuit is a 20 V battery connected to an arrangement of four resistors. If the potential difference between points P and Q in the circuit is zero then :

UPSC Combined Geo-Scientist Prelims 2024 Paper I (General Studies), Q95: figure printed with the question
  1. (a) R = 2 Ω
  2. (b) R = 8 Ω
  3. (c) R = 18 Ω
  4. (d) R = 4 Ω

Answer and explanation with the VKC plan

Q96Electrostatics / induced charges

A small metallic sphere is held in a non-uniform electrostatic field as shown in the figure. Also shown are two points P and Q on the surface of the sphere. Which one of the following statements is true for the sphere ?

UPSC Combined Geo-Scientist Prelims 2024 Paper I (General Studies), Q96: figure printed with the question
  1. (a) Sphere does not experience a force in the field.
  2. (b) Surface charge density at point P is positive while at point Q is negative.
  3. (c) Sphere experiences a force towards the left.
  4. (d) Sphere experiences a force towards the right.

Answer and explanation with the VKC plan

Q97Polity / parliamentary questions

Which of the following statements is *not* correct with respect to the types of questions asked in the Lok Sabha ?

  1. (a) A 'Starred Question' is the one to which only a written answer is given.
  2. (b) A 'Short Notice Question' is the one which relates to a matter of urgent public importance.
  3. (c) An 'Unstarred Question' is the one to which an oral answer is not given.
  4. (d) No supplementary question can be asked on an 'Unstarred Question'.

Answer and explanation with the VKC plan

Q98Polity / parliamentary procedure

Which of the following statements is/are *not* correct about the parliamentary practice of asking Questions in the Parliament of India ?

  1. The first hour of every sitting in both the Houses of Parliament is devoted to asking questions, referred to as the 'Question Hour'.
  2. Questions are generally asked by the Members of Parliament from the Ministers.
  3. 'Half-an-Hour Discussions' on matters arising out of questions already answered can be held only in the Lok Sabha.
  4. Questions cannot be addressed to a private member.

Select the answer using the code given below :

  1. (a) 1 and 2
  2. (b) 2 and 3
  3. (c) 3 and 4
  4. (d) 2 and 4

Answer and explanation with the VKC plan

Q99Polity / censure and no-confidence motions

Consider the following statements with respect to 'Motions' in the Parliament of India :

  1. A Censure Motion must specify the ground on which it is based.
  2. A Censure Motion can be moved even against an individual minister.
  3. A No-confidence Motion can be initiated in either House of the Parliament. However, a government will fall only if the No-confidence Motion is passed in the Lok Sabha.
  4. A No-confidence Motion must specify the charges against the Council of Ministers on the basis of which the Motion is to be based.

How many of the above statements is/are correct ?

  1. (a) 1
  2. (b) 2
  3. (c) 3
  4. (d) 4

Answer and explanation with the VKC plan

Q100International organisations / UN

Which one among the following statements about the United Nations (UN) is *not* correct ?

  1. (a) All the main bodies of the United Nations, such as the General Assembly, the Security Council, the Trusteeship Council, etc. were established with the founding of the UN in 1945.
  2. (b) The United Nations System comprises not only the main bodies, but also many funds, programmes and specialized agencies.
  3. (c) Specialized agencies of the UN System are funded by both voluntary and assessed contributions.
  4. (d) The programmes and funds of the UN System are financed only through assessed contributions.

Answer and explanation with the VKC plan

Q101Current affairs / gender reports

Consider the following statements with reference to a Report titled 'The Paths to Equal', published in 2023, prepared by 'UN Women' and 'UNDP' (United Nations Development Programme) :

  1. This Report introduces two new indices : Women's Empowerment Index (WEI) and Global Gender Parity Index (GGPI).
  2. Less than 1% of women and girls live in a country with high women's empowerment and a small gender gap.

Which of the above statements is/are correct ?

  1. (a) 1 only
  2. (b) 2 only
  3. (c) Both 1 and 2
  4. (d) Neither 1 nor 2

Answer and explanation with the VKC plan

Q102Polity / constitutional amendments

Arrange the following events in the correct chronological order :

  1. Passage of the Anti-defection law by the Parliament of India
  2. Mizoram was made a state
  3. Voting age was reduced from 21 to 18
  4. Maithili was added to the Eighth Schedule of the Constitution of India

Select the answer using the code given below :

  1. (a) 2, 3, 1, 4
  2. (b) 1, 3, 2, 4
  3. (c) 4, 3, 2, 1
  4. (d) 1, 2, 3, 4

Answer and explanation with the VKC plan

Q103Current affairs / governance indices

Which of the following statements about 'Good Governance Index' (GGI) is/are *not* correct ?

  1. The first Good Governance Index, prepared by the Department of Administrative Reforms and Public Grievances (DARPG) in partnership with the Centre for Good Governance, Hyderabad, was brought out in 2019.
  2. The framework of assessment includes some sectors and indicators. GGI 2021 excluded 'Agriculture and Allied sectors' from the framework of assessment.
  3. According to GGI 2021, Jharkhand is one of the few states that has performed badly.
  4. Union Territories are not under the purview of GGI.

Select the answer using the code given below :

  1. (a) 1 and 2
  2. (b) 2, 3 and 4
  3. (c) 2 only
  4. (d) 4 only

Answer and explanation with the VKC plan

Q104International organisations / World Bank Group

Which one of the following institutions is *not* in the 'World Bank Group' ?

  1. (a) International Centre for Settlement of Investment Disputes (ICSID)
  2. (b) Multilateral Investment Guarantee Agency (MIGA)
  3. (c) Investment Policy Framework for Sustainable Development (IPFSD)
  4. (d) International Finance Corporation (IFC)

Answer and explanation with the VKC plan

Q107Ecology / ecotone

Which one among the following statements regarding Ecotone is correct ?

  1. (a) It represents a transitional region between two ecosystems.
  2. (b) It represents a region which is ecologically perfect.
  3. (c) It represents a region which is ecologically barren of organisms.
  4. (d) It represents an ecosystem containing deep marine organisms.

Answer and explanation with the VKC plan

Q108Biogeography / zones of India

Which one among the following biogeographic zones of India covers the largest area ?

  1. (a) Trans-Himalayas
  2. (b) Desert
  3. (c) Semi-arid region
  4. (d) Himalayan region

Answer and explanation with the VKC plan

Q109Environment / protected areas

Keibul Lamjao National Park is located in which one of the following wetlands ?

  1. (a) Chilika Lagoon of Odisha
  2. (b) Loktak Lake of Manipur
  3. (c) Deepor Beel of Assam
  4. (d) Gurudongmar Lake of Sikkim

Answer and explanation with the VKC plan

Q110Environment / IUCN categories

According to IUCN Red list, a 'vulnerable' species is one which :

  1. (a) is likely to become endangered in the near future.
  2. (b) has a very high risk of getting extinct in the wild.
  3. (c) is known only to survive in the wild.
  4. (d) is known only to survive in captivity, or as a naturalized population outside its historic range.

Answer and explanation with the VKC plan

Q111Economy / dairy sector

Which of the following statements with respect to milk production in India is/are *not* correct ?

  1. From 2013 – 14 to 2021 – 22, the milk production in India has registered an increase of more than 50 percent.
  2. Although the milk production over the above period has increased, per capita availability of milk has decreased.

Select the answer using the code given below :

  1. (a) 1 only
  2. (b) 2 only
  3. (c) Both 1 and 2
  4. (d) Neither 1 nor 2

Answer and explanation with the VKC plan

Q112Sports / governing bodies

Which one of the following is the world governing body for Badminton recognized by the International Olympic Committee and the International Paralympic Committee ?

  1. (a) World Badminton League
  2. (b) Badminton World Federation
  3. (c) International Badminton Federation
  4. (d) International Federation of Badminton

Answer and explanation with the VKC plan

Q113Current affairs / sports

Which of the following was the official song for the FIFA Women's World Cup 2023 ?

  1. (a) Lets Get Together Now
  2. (b) The Time of Our Lives
  3. (c) Live It Up
  4. (d) Do It Again

Answer and explanation with the VKC plan

Q114Current affairs / international indices

Arrange the following countries in the descending order of their rank in the World Happiness Report, based on a three-year average 2020 – 2022, published by the Sustainable Development Solutions Network :

  1. Israel
  2. United Kingdom
  3. United States of America
  4. Switzerland

Select the answer using the code given below :

  1. (a) 1, 4, 3, 2
  2. (b) 4, 3, 2, 1
  3. (c) 2, 4, 3, 1
  4. (d) 3, 4, 2, 1

Answer and explanation with the VKC plan

Q115Current affairs / UNESCO

Which one of the following is *not* correct about the UNESCO Creative Cities of Literature ?

  1. (a) Kozhikode is India's first UNESCO City of Literature
  2. (b) UNESCO launched it in 2004
  3. (c) Edinburgh was the first UNESCO City of Literature
  4. (d) There are four cities of India in this list

Answer and explanation with the VKC plan

Q116Government schemes / agriculture

Which one among the following statements about PDMC scheme (Per Drop More Crop) is *not* correct ?

  1. (a) This scheme focuses on enhancing water use efficiency at farm level through micro-irrigation.
  2. (b) The cost borne in implementing this scheme is shared by the Central Government and the State Governments in the ratio of 50 : 50.
  3. (c) It is a Centrally sponsored scheme.
  4. (d) This scheme is implemented under *Rashtriya Krishi Vikas Yojna*.

Answer and explanation with the VKC plan

Q117Current affairs / environment campaigns

Which of the following statements about 'Rehydrating the Earth' is/are correct ?

  1. It is a global campaign for raising consciousness about the water crisis.
  2. It is an impact-driven campaign that highlights achievements at key global events such as COP28.
  3. It is a campaign undertaken by a philanthropic organization 'Football for Peace'.

Select the answer using the code given below :

  1. (a) 1 and 2 only
  2. (b) 2 and 3 only
  3. (c) 1, 2 and 3
  4. (d) 2 only

Answer and explanation with the VKC plan

Q118Current affairs / technology

Which of the following statements about GPAI (Global Partnership on Artificial Intelligence) is/are correct ?

  1. It is a multi-stakeholder initiative, which aims to bridge the gap between theory and practice on AI by supporting cutting edge research.
  2. The Annual GPAI Summit was held at New Delhi in December 2023.

Select the answer using the code given below :

  1. (a) 1 only
  2. (b) 2 only
  3. (c) Both 1 and 2
  4. (d) Neither 1 nor 2

Answer and explanation with the VKC plan

Q119Current affairs / international relations

Which of the following statements about the 'Blue Line' is correct ?

  1. It is a learning ecosystem created by the UN System Staff College.
  2. It is a line of withdrawal, set by the UN for the purpose of confirming the withdrawal of Israeli forces from the south of Lebanon.

Select the answer using the code given below :

  1. (a) 1 only
  2. (b) 2 only
  3. (c) Both 1 and 2
  4. (d) Neither 1 nor 2

Answer and explanation with the VKC plan

Q120Current affairs / education

In December 2023, the Parliament of India passed a Bill to establish 'the Sammakka Sarakka Central Tribal University' in which one among the following states ?

  1. (a) Telangana
  2. (b) Jharkhand
  3. (c) Chhattisgarh
  4. (d) Andhra Pradesh

Answer and explanation with the VKC plan

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