Basic Concepts PYQs — 22 UPSC CSE Previous Year Questions

Question 1

Ball bearings are used in bicycles, cars, etc., because

Accepted Answer

C. the effective area of contact between the wheel and axle is reduced

Question 2

Consider the following statements: If there were no phenomenon of capillarity it would be difficult to use a kerosene lamp one would not be able to use a straw to consume a soft drink the blotting paper would fail to function the big trees that we see around would not have grown on the Earth Which of the statements given above are correct?

Accepted Answer

B. 1, 3 and 4 only

Question 3

Four wires of same material and of dimensions as under are stretched by a load of same magnitude separately. Which one of them will be elongated maximum?

Accepted Answer

C. Wire of 3in length and 1.5 mm diameter

Question 4

Which of the following pairs are correctly matched? Inventor Invention 1. Christopher Hovercraft Cockerel 2. David Bushnell Submarine 3. J. C. Perrier Steamship

Accepted Answer

A. 1, 2 & 3

Question 5

A weightless rubber balloon is filled with 200 cc of water. Its weight in water is equal to:

Accepted Answer

D. zero

Question 6

A spherical body moves with a uniform angular velocity (() around a circular path of radius r. Which one of the following statements is correct?

Accepted Answer

B. The body has a radial acceleration (2r directed toward centre of path

Question 7

A car is running on a road at a uniform speed of 60 km/h. The net resultant force on the car is:

Accepted Answer

D. equal to zero

Question 8

Consider the following statements:

A 4-wheel vehicle moving in a sharp circular path at high speed will:

overturn about its outer wheels
overturn about its inner wheels
skid outwards
skid inwards

Which of these statements are correct?

Accepted Answer

A. 1 and 3

Question 9

Assertion (A): The weight of a body decreases with the increase of altitude on earth. Reason (R) : The earth is not a perfect sphere. Codes:

Accepted Answer

B. Both A and R are true but R is not a correct explanation of A

Question 10

An oil tanker partially filled with oil moves forward on a level road with uniform acceleration. The free surface of oil then:

Accepted Answer

C. is inclined to the horizontal with larger depth at the rear end

Question 11

Assertion (a): Artificial satellites are always launched from the earth in the eastward direction. Reason (R) : The earth rotates from west to east and so the satellite attains the escape velocity.

Accepted Answer

C. A is true but R is false

Question 12

Assertion (A): An iron ball floats on mercy but gets immersed in water. Reason (R): The specific gravity of iron is more than that of mercury. Codes:

Accepted Answer

C. A is true but R is false

Question 13

Consider the following statements:

A simple pendulum is set into oscillation. Then:

The acceleration is zero when the bob passes through the mean position.
In each cycle the bob attains a given velocity twice.
Both acceleration and velocity of the bob are zero when it reaches its extreme position during the oscillation.
The amplitude of oscillation of the simple pendulum decreases with time.

Which of these statements are correct?

Accepted Answer

C. 1, 2 and 4

Question 14

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

List I (Institute)	List II (Location)
I. Central Institute of Higher Tibetan Studies	A) Hyderabad
II. Indira Gandhi Institute of Development Research	B) Mumbai
III. National Institute of Mental Health and Neurosciences	C) Bangalore
IV. Central Institute of English and Foreign Languages	D) Dharamshala
	E) Varanasi

Accepted Answer

B. I-E, II-B, III-C, IV-A

Question 15

A hunter aims his gun at a point between the eyebrows of a monkey sitting on a branch of a tree. Just as he fires, the monkey jumps down. The bullet will:

Accepted Answer

A. hit the monkey at the point aimed

Question 16

A girl is swinging on a swing in sitting position. When the girl stands up, the period of swing will:

Accepted Answer

A. be shorter

Question 17

The working principle of a washing machine is:

Accepted Answer

A. centrifugation

Question 18

Which one of the following is a vector quantity?

Accepted Answer

A. Momentum

Question 19

A simple machine helps a person in doing:

Accepted Answer

B. the same amount of work with lesser force

	Inventor	Invention
1.	Christopher	Hovercraft Cockerel
2.	David Bushnell	Submarine
3.	J. C. Perrier	Steamship