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.
Take this paper offlineAll 120 questions with answers and explanations in one PDF.
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 ?
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 :
Consider the following statements about Chlorofluorocarbons (CFCs) :
CFCs remain inert in the troposphere but slowly diffuse into the stratosphere.
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).
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 ?
Nitrogen cycle is one of the most important microorganisms-mediated chemical reactions in aquatic and soil environments. In this context consider the following statements :
Nitrogen fixation is the process of oxidising NH₃ to NO₃⁻.
Nitrification process causes reduction of NO₃ and NO₃⁻, to NO₂⁻, followed by recycling of N₂ to the atmosphere.
Denitrification converts molecular N₂ into a fixed form as an organic nitrogen.
How many of the statements given above is/are correct ?
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 ?
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)
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 ?
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 ?
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 ?
As per the Constitution of India, which one among the following statements is correct ?
(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.
(b) Administrative expenses of the office of the CAG are charged upon the Contingency Fund of India.
(c) The reports of the CAG relating to the accounts of the Union and States are submitted to the President of India.
(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.
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.
National Commission for Backward Classes, National Commission for Minorities and National Commission for Scheduled Castes are constitutional bodies.
National Commission for Women is not a constitutional body.
Which of the statements given above is/are *not* correct ?
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 :
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 ?
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 ?
(a) Step graph: E decreases from each region to the next across all five regions
(b) Step graph: E decreases over the first three regions, rises in the fourth, then falls in the fifth
(c) Step graph: E decreases over the first three regions, then rises in the fourth and rises again in the fifth
(d) A graph of the same shape as the potential curve
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 ?
(a) Straight parallel field lines passing through the shell undisturbed
(b) Parallel field lines stopping at the shell surface without bending, none inside
(c) Field lines bending to meet the shell surface normally, no field lines inside
(d) Field lines bending towards the shell and also passing through its interior
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 ?
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 ?
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 ?
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) ?
Which one among the following statements is *not* correct as per the Constitution of India ?
(a) National Commission for Minorities appoints a Special Officer for linguistic minorities.
(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.
(c) The word 'Hindustani' is mentioned in the Constitution with reference to the enrichment of the Hindi language.
(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.
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* ?
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 ?
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 ?
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 :
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 :
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)
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 :
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 ?
(a) Sphere does not experience a force in the field.
(b) Surface charge density at point P is positive while at point Q is negative.
Consider the following statements with respect to 'Motions' in the Parliament of India :
A Censure Motion must specify the ground on which it is based.
A Censure Motion can be moved even against an individual minister.
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.
A No-confidence Motion must specify the charges against the Council of Ministers on the basis of which the Motion is to be based.
Which one among the following statements about the United Nations (UN) is *not* correct ?
(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.
(b) The United Nations System comprises not only the main bodies, but also many funds, programmes and specialized agencies.
(c) Specialized agencies of the UN System are funded by both voluntary and assessed contributions.
(d) The programmes and funds of the UN System are financed only through assessed contributions.
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) :
This Report introduces two new indices : Women's Empowerment Index (WEI) and Global Gender Parity Index (GGPI).
Less than 1% of women and girls live in a country with high women's empowerment and a small gender gap.
Which of the following statements about 'Good Governance Index' (GGI) is/are *not* correct ?
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.
The framework of assessment includes some sectors and indicators. GGI 2021 excluded 'Agriculture and Allied sectors' from the framework of assessment.
According to GGI 2021, Jharkhand is one of the few states that has performed badly.
Union Territories are not under the purview of GGI.
Which one of the following is the world governing body for Badminton recognized by the International Olympic Committee and the International Paralympic Committee ?
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 :
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 ?