General Science PYQ – Measurement, Motion and Properties of Matter – Part 2 (Q 33–64)
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A falling raindrop's air drag increases until it equals the weight, giving zero net force and acceleration at a constant non-zero terminal speed, so statement (4) is incorrect.
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General Science PYQ – Measurement, Motion and Properties of Matter – Part 2 (Q 33–64) – 32 questions, subject: Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.
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1.
GSCE 2021
If a person moving from pole to equator, the centrifugal force acting on himCorrect Answer: A [Increases]
Explanation:
Centrifugal force due to Earth's rotation is m w^2 r, which is zero at the pole and maximum at the equator, so it increases from pole to equator.
2.
Group 1B/1C 2024
When two solid balls/surfaces in contact move relative to each other, ______ opposes their relative motion.Correct Answer: A [Friction]
Explanation:
Friction is the force that opposes the relative motion between surfaces in contact.
3.
EO Group VII (HR&CE) 2022
It is difficult to walk on ice bar becauseCorrect Answer: D [Friction is low]
Explanation:
Ice is very smooth and offers very little friction, so the foot cannot get the grip needed to walk.
4.
(a) Static friction – 1. Viscosity
(b) Kinetic friction – 2. Least friction
(c) Rolling friction – 3. Objects are in motion
(d) Friction between the liquid layers – 4. Objects are at rest
Asst. Training Officer (Textile) 2023
Match the following:(a) Static friction – 1. Viscosity
(b) Kinetic friction – 2. Least friction
(c) Rolling friction – 3. Objects are in motion
(d) Friction between the liquid layers – 4. Objects are at rest
Correct Answer: A [4 3 2 1]
Explanation:
Static friction acts on bodies at rest, kinetic friction on moving bodies, rolling friction is the least, and viscosity is friction between fluid layers, matching 4 3 2 1.
5.
AGGS 2021
A good lubricant should have the following propertyCorrect Answer: A [It should be capable of conducting away heat produced by friction]
Explanation:
A good lubricant should carry away the heat produced by friction and also resist chemical change and decomposition at high temperature.
6.
ARGS 2020
Newton's law of gravitation states thatCorrect Answer: D [F = G m1 m2 / r²]
Explanation:
Newton's law of gravitation says the force is proportional to the product of the masses and inversely proportional to the square of the distance, F = G m1 m2 / r^2.
7.
Group 1B/1C 2024
Two objects of masses 1 kg each separated by a distance of 1 m attract each other. The force of attraction is F. The gravitational constant is G. ThenCorrect Answer: D [F/G = 1]
Explanation:
With m1 = m2 = 1 kg and r = 1 m, F = G m1 m2 / r^2 reduces to F = G, so F/G = 1.
8.
AD Social Welfare 2022
The relation between gravitational constant 'G' and acceleration due to gravity 'g' isCorrect Answer: A [GM = gR²]
Explanation:
At Earth's surface the weight mg equals GMm/R^2, so g = GM/R^2, giving GM = gR^2.
9.
VAS AHGS 2020
The value of acceleration due to gravity from equator to the poleCorrect Answer: A [Increases]
Explanation:
Because Earth is flattened at the poles (smaller radius) and has no rotational effect there, g increases from the equator to the pole.
10.
Fisheries Inspector / SI 2023
The relation between weight and gravitational mass isCorrect Answer: A [w = mg]
Explanation:
Weight is the gravitational force on a body, so w = mg.
11.
Group 3A 2023
If a man has a mass of 50 kg on Earth, then what is his weight?Correct Answer: A [490 N]
Explanation:
Weight w = mg = 50 x 9.8 = 490 N; weight is a force measured in newtons.
12.
Asst. Training Officer (Textile) 2023
The mass of a body is measured on Earth as M kg. When it is taken to a planet of radius half that of the earth, then its value will be ______ kg.Correct Answer: C [1M]
Explanation:
Mass is the quantity of matter in a body and does not change with place, so it remains M kg on any planet.
13.
1. Potential energy
2. Momentum
3. Kinetic energy
Group 1 2022
When a ball is projected upwards there is an increase in its1. Potential energy
2. Momentum
3. Kinetic energy
Correct Answer: A [1 only]
Explanation:
As a ball rises its height increases, so potential energy (mgh) increases while its speed, kinetic energy and momentum decrease.
14.
CSSS 2023
Which of the following is a conservative force?Correct Answer: D [Both (A) and (B) are correct]
Explanation:
Gravitational and electrostatic forces are conservative because the work they do depends only on the initial and final positions, not the path.
15.
Bursar 2023
How is the Thanjavur doll performing a dance-like continuous movement without falling?Correct Answer: C [Centre of gravity]
Explanation:
The Thanjavur doll has a heavy hemispherical base, so its centre of gravity is very low and returns it upright when tilted, giving its continuous dance-like movement.
16.
GSHA 2021
A rod has a mass of 100 g and length 1 m. Its radius of gyration perpendicular to its length and passing through its centre of gravity isCorrect Answer: A [0.2886 m]
Explanation:
For a thin rod about a perpendicular axis through its centre, I = ML^2/12, so the radius of gyration K = L/sqrt(12) = 1/3.464, about 0.2886 m.
17.
Executive Officer Gr. IV (HR&CE) 2022
More number of wheels are provided for a heavy goods carrier in order to decrease the ______, thereby increasing the area of contact on the road.Correct Answer: A [Pressure]
Explanation:
Pressure equals force divided by area, so more wheels increase the contact area and decrease the pressure on the road.
18.
Group 4 2022
In automobile service stations, the vehicles are lifted upward using the hydraulic lift, which works based onCorrect Answer: C [Pascal's law]
Explanation:
A hydraulic lift works on Pascal's law, which says pressure applied to a confined fluid is transmitted equally in all directions.
19.
Hostel Supdt. cum PTO 2024
An upward force exerted by the liquid on a floating body isCorrect Answer: D [Buoyant force]
Explanation:
The upward force exerted by a liquid on a floating or immersed body is the buoyant force, equal to the weight of liquid displaced.
20.
Field Surveyor 2022
Which one of the following has the highest density?Correct Answer: B [Water]
Explanation:
Among air, water, kerosene and wood, water has the highest density, about 1000 kg per cubic metre.
21.
Reason [R]: Metacentre (M) coincides with centre of gravity (G) all the time and it continues to float in all positions.
District Educational Officer 2023
Assertion [A]: In the case of a sphere floating in a liquid, a tilt one way or other does not change the shape of the displaced liquid and it is said to be in neutral equilibrium.Reason [R]: Metacentre (M) coincides with centre of gravity (G) all the time and it continues to float in all positions.
Correct Answer: B [Both [A] and [R] are true, and [R] is the correct explanation of [A]]
Explanation:
A floating sphere tilting does not change the shape of the displaced liquid, so the centre of buoyancy stays unchanged and the equilibrium is neutral, so R explains A.
22.
District Child Protection Officer 2022
During the storm wind, blowing off of roofs is the application ofCorrect Answer: C [Bernoulli's theorem]
Explanation:
By Bernoulli's theorem, fast-moving air over a roof lowers the pressure above it, so higher pressure inside lifts the roof off during a storm.
23.
VAS AHGS 2020
When detergent is mixed with water, the dirt from clothes is easily removed. This is due toCorrect Answer: C [Surface tension]
Explanation:
Detergent lowers the surface tension of water, letting it penetrate fabric fibres and lift dirt and grease away.
24.
AD Co-operation 2022
Mosquitoes breed on the surface of fresh water because ofCorrect Answer: B [Surface tension]
Explanation:
Surface tension makes the surface of fresh water act like a thin elastic film, on which mosquito eggs and larvae can rest.
25.
Bursar 2023
All liquid drops assume spherical shapes, on account ofCorrect Answer: B [Surface tension]
Explanation:
Surface tension tends to minimise the surface area, and a sphere has the least area for a given volume, so liquid drops are spherical.
26.
Group 1 2021
Water drop in space is spherical because in the absence/reduced effects of gravity, the forces governing the objects are all the same and therefore the dropCorrect Answer: A [attains a shape having the least amount of surface area.]
Explanation:
In space gravity's effect is negligible and surface tension dominates, so a water drop takes the shape with the least surface area, a sphere.
27.
GSHA 2021
The wettability of a surface by a liquid depends primarily onCorrect Answer: D [angle of contact between the surface and the liquid]
Explanation:
Whether a liquid wets a surface depends on the angle of contact, which is less than 90 degrees for wetting liquids like water on glass.
28.
District Educational Officer 2023
Water rises upto a height h in a capillary tube of a certain diameter. The capillary tube is replaced by a similar capillary tube of half the diameter. The water will rise to a height ofCorrect Answer: C [2h]
Explanation:
Capillary rise is h = 2T cos(theta)/(r rho g), so h is inversely proportional to radius; halving the diameter doubles the rise to 2h.
29.
Combined Accounts Service 2024
Which of the following is related to poise?Correct Answer: B [Viscosity]
Explanation:
The poise is the CGS unit of the coefficient of viscosity, where 1 poise equals 0.1 Pa s.
30.
VCGS 2022
Viscosity is a transport phenomenon in whichCorrect Answer: D [Momentum is transported]
Explanation:
In viscous flow, momentum is transferred from faster-moving fluid layers to slower ones, so viscosity is a momentum transport phenomenon.
31.
Asst. Director (Fisheries) 2022
Terminal velocity is related toCorrect Answer: A [Viscosity]
Explanation:
Terminal velocity is reached when viscous drag plus buoyancy balances the weight of a body falling through a viscous medium.
32.
(1) Upward air drag force increases
(2) It comes with zero acceleration
(3) It comes with zero net force
(4) It comes with zero terminal velocity
District Educational Officer 2023
Which of the following is incorrect? As a rain drop descends towards earth,(1) Upward air drag force increases
(2) It comes with zero acceleration
(3) It comes with zero net force
(4) It comes with zero terminal velocity
Correct Answer: A [(4) only]
Explanation:
A falling raindrop's air drag increases until it equals the weight, giving zero net force and acceleration at a constant non-zero terminal speed, so statement (4) is incorrect.
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› General Science PYQ – Genetics, Evolution and Biotechnology – Part 1 (Q 1–26)
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