GS: Hindi / English · Language questions stay in their original language.
150 questions · 150 marks · 2 hours 30 minutes
Choose one option per question.
Tap an option to check it, or open “See answer”.
Correct answer: (C) 10
To divide a segment in the ratio 3 : 7 one marks 3 + 7 = 10 equal parts on it.
Correct answer: (D) 25°
With ∠APB = 50°, ∠AOB = 180° − 50° = 130°. In triangle OAB, OA = OB, so ∠OAB = (180° − 130°) ÷ 2 = 25°.
Correct answer: (A) 3.3 m²
The surface area of the tank = the curved surface of the cylinder + that of the hemisphere = 2πrh + 2πr². Putting r = 0·3 m and h = 1·45 m gives about 3·3 m².
Correct answer: (D) 1
Every power of 6 ends in 6 and every power of 5 ends in 5, so 6ⁿ − 5ⁿ always ends in 1.
Correct answer: (E) None of these
x = a is a vertical line and y = b a horizontal one, so they meet at (a, b)—not at (b, a). None of the options is correct.
Correct answer: (D) 4/5
He hit the boundary off 8 of the 40 balls, so not off 32 of them. The probability = 32/40 = 4/5.
Correct answer: (A) 30°
tan A = cot(30° + A) means A + (30° + A) = 90°, so 2A = 60° and A = 30°.
Correct answer: (C) 15.5
The x-coordinate of the point where the ‘less than’ and ‘more than’ ogives cross is the median—here 15·5.
Correct answer: (C) 1/7
An ordinary year has 365 days—52 weeks and one day over. That day may be any of the seven, so the probability of 53 Sundays is 1/7.
Correct answer: (A) 50 m
The angles of elevation and depression being equal, the top of the tower is as far above the cliff as its foot is below—that is 25 m. The whole height = 25 + 25 = 50 m.
Correct answer: (A) Frictional force
The force applied to keep an object at a constant velocity only balances the frictional force; the net force stays zero.
Correct answer: (C) Ethene
Ethene (C₂H₄) has a double bond between its carbons, so it is an unsaturated hydrocarbon. Methane and ethane have only single bonds.
Correct answer: (B) Plasma membrane
The membrane surrounding the cell is the plasma membrane. The cell wall is found only in plant cells, outside it.
Correct answer: (E) None of the above
The study of the inheritance of traits is called genetics. ‘Heredity’ is the phenomenon itself, not the branch of study—so none of the options is correct.
Correct answer: (C) 50 km/h
Average speed = total distance ÷ total time = 200 ÷ 4 = 50 km/h.
Correct answer: (B) Mitochondria
The breakdown of pyruvate into carbon dioxide, water and energy happens in the mitochondria, which is why they are called the powerhouse of the cell.
Correct answer: (C) Electron
The electron's mass is about 1/1836 of a proton's or a neutron's, so it is taken as negligible.
Correct answer: (B) Steel
Sound travels fastest in a solid, where the particles are close together and strongly bound—so its speed is greatest in steel.
Correct answer: (B) Zinc is more reactive than tin
Zinc is more reactive than tin and can react with the acids in food, so the less reactive tin makes the safer coating.
Correct answer: (A) It becomes one-fourth
The gravitational force is inversely proportional to the square of the distance, so doubling the distance leaves it one-fourth.
Correct answer: (D) More than one of the above
Saving electricity, walking, and carrying a cloth bag are all environment-friendly habits, so the answer is ‘more than one’.
Correct answer: (B) Ketone
The ending ‘-one’ in butanone shows that it holds the ketone group.
Correct answer: (B) Growth
The cells of the meristematic tissue keep dividing, so its work is the growth of the plant.
Correct answer: (A) 156250 J
30 km/h = 25/3 m/s and 60 km/h = 50/3 m/s. The work done = the change in kinetic energy = ½ × 1500 × [(50/3)² − (25/3)²] = 156250 J.
Correct answer: (C) Sulphur dioxide
Lichens are very sensitive to sulphur dioxide and vanish from polluted areas, which is why they are called its biological indicator.
Correct answer: (A) Troposphere
All the happenings of weather—cloud, rain, storm—take place in the troposphere, since the water vapour and the dust are there.
Correct answer: (A) Synapse
The gap between two nerve cells is called a synapse, where the impulse is carried across by chemicals.
Correct answer: (C) 2, 5
Nitrogen's atomic number is 7, so its configuration is 2, 5.
Correct answer: (A) Grass, goat and human
In a food chain the energy passes from one level to the next—grass, goat and human come in just that order. In the other options all the living things stand at the same level.
Correct answer: (C) Concentric circles
Round a straight current-carrying wire the magnetic field lines form concentric circles, with their centre on the wire.
Correct answer: (C) Hydrogen gas and iron chloride are produced
Dilute hydrochloric acid reacts with iron filings to give ferrous chloride and hydrogen gas.
Correct answer: (A) Excretion
The kidneys filter nitrogenous waste out of the blood and make urine, so they belong to the system of excretion.
Correct answer: (A) IR²
Electrical power is written as VI, I²R or V²/R. ‘IR²’ is none of these, so it does not represent power.
Correct answer: (A) Ability to flow easily
It is a mark of a solid that it does not flow—flowing belongs to liquids and gases. The other two are properties of solids.
Correct answer: (C) Scattering
The fine particles of the atmosphere scatter blue light more, since its wavelength is shorter—which is why the sky looks blue.
Correct answer: (A) 0.2 m s⁻² and −0.4 m s⁻²
In the first part the acceleration = (6 − 0) ÷ 30 = 0·2 m s⁻². In the second, (4 − 6) ÷ 5 = −0·4 m s⁻², the minus sign showing retardation.
Correct answer: (C) They lose the ability to divide
The cells of a permanent tissue are formed from the meristem and then set into a particular work, losing the power to divide.
Correct answer: (B) Turn blue litmus paper red
It is a mark of an acid that it turns blue litmus red; bases turn red litmus blue, and an acid's pH is below 7.
Correct answer: (D) More than one of the above
By Newton's second law a = F/m, so the acceleration is proportional to the force and also to the inverse of the mass—both statements hold.
Correct answer: (D) More than one of the above
Gibberellin, cytokinin and auxin are all plant hormones, so the answer is ‘more than one’.
Correct answer: (B) Sublimation
A substance passing straight from solid to gas is said to sublime—as camphor or naphthalene does.
Correct answer: (B) Pollen grains
The pollen grains are formed in the anther. The ovules lie in the ovary.
Correct answer: (C) Slaked lime
Calcium hydroxide is called slaked lime. Its clear solution is lime water.
Correct answer: (C) Robert Hooke
Robert Hooke first saw cells in 1665, in a thin slice of cork, and gave them the name ‘cell’.
Correct answer: (C) Joule
The SI unit of work is the joule. The newton is the unit of force and the watt of power.
Correct answer: (A) Burning of coal
Burning coal makes new substances and leaves nothing as it was, so it is a chemical change. Salt dissolving and ice melting are physical changes.
Correct answer: (B) Tuberculosis
Tuberculosis is spread through the air by a bacterium, not by any insect vector. Dengue and malaria are carried by mosquitoes.
Correct answer: (C) It bends towards the normal
Glass is denser than air, so light entering it bends towards the normal.
Correct answer: (C) Applying grease
Paint or a coating of zinc will not do for a frying pan, since it goes on the fire and food is cooked on it. So it is kept from rusting by greasing or oiling.
Correct answer: (D) More than one of the above
The acceleration due to gravity at the Earth's surface is 9·8 m/s², which is also taken as about 10 for ease of calculation—so more than one option is correct.