# Mechanics – Old Year Questions

1. A simple machine helps a person in doing :

(a) Less work
(b) The same amount of work with lesser force
(c) The same amount of work slowly
(d) The same amount of work much faster

[I.A.S. (Pre) 1996]

2. A man is standing on a sensitive balance. If he inhales deeply, the reading of the balance –

(a) Increases
(b) Decreases
(c) Remains unaffected
(d) May increase or decrease depending on the atmospheric pressure

[U.P.P.C.S. (Mains) 2013]

3. Which of the following is not a vector quantity?

(a) Displacement
(b) Velocity
(c) Force
(d) Volume

[45th B.P.S.C. (Pre) 2001]

4. Which of the following is a vector quantity?

(a) Time
(b) Speed
(c) Displacement
(d) Distance

[U.P.R.O./A.R.O. (Mains) 2014]

5. Which one of the following is a scalar quantity?

(a) Force
(b) Pressure
(c) Velocity
(d) Acceleration
(e) None of the above/More than one of the above

[65th B.P.S.C. (Pre) 2019]

6. Which one of the following is a vector quantity?

(a) Momentum
(b) Pressure
(c) Energy
(d) Work

[I.A.S. (Pre) 1997]

7. Which physical quantity is represented by the ratio of momentum and velocity of the body?

(a) Velocity
(b) Acceleration
(c) Mass
(d) Force

[45th B.P.S.C. (Pre) 2001]

8. Force is the product of –

(a) Mass and velocity
(b) Mass and acceleration
(c) Weight and velocity
(d) Weight and acceleration

[45th B.P.S.C. (Pre) 2001]

9. If the number represents volume and surface area of a cube are equal, then the length of the edge of the cube in terms of the unit of measurement will be –

(a) 3
(b) 4
(c) 5
(d) 6

[I.A.S. (Pre) 1997]

10. Energy conservation means –

(a) Generation and destruction of energy
(b) Energy could be created
(c) Energy could not be created but destroyed
(d) Energy can neither be created nor destroyed

[M.P.P.C.S. (Pre) 2000]

11. The energy of wind is –

(a) Only potential
(b) Only kinetic
(c) Electrical
(d) Potential and kinetic both

[Uttarakhand Lower Sub. (Pre) 2010]

12. In wind power, which form of energy is converted into electrical energy?

(a) Kinetic energy
(b) Potential energy
(c) Solar energy

[U.P. PCS (Pre) 2016]

13. Match List I with List II and choose the correct answer from the code given below list-I List –II

 (Energy Conversion) (Device/Mechanism) A. Heat to electric 1. Car Braking B. Electric to sound 2. Nuclear reactor C. Mass to heat 3. Loudspeaker D. Chemical to heat and light 4. Solar cell 5. Fuel combustion

Code :
A B C D

(a) 1 2 3 4
(b) 4 3 2 5
(c) 2 1 3 5
(d) 3 1 2 4

[U.P.P.C.S. (Mains) 2002]

14. Newton’s first law of motion is known as

(a) Gravity
(b) Law of Inertia
(c) Law of conservation of momentum
(d) Vertical motion

[Chhattisgarh P.C.S. (Pre) 2019]

15. As the train starts moving, the head of the passenger sitting inside leans backward because of –

(a) Inertia of Rest
(b) Inertia of Motion
(c) Moment of Inertia
(d) Conservation of Mass

[U.P. U.D.A./L.D.A. (Pre) 2010]

16. Static science is associated with –

(a) Dynamic situation
(b) Situation of rest
(c) Mental situation
(d) Data analyzing

[M.P. P.C.S. (Pre) 2012]

17. Assertion (A): A man standing on a completely frictionless surface can propel himself by whistling.
Reason (R): If no external force acts on a system, its momentum cannot change.

Code :

(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

[I.A.S. (Pre) 2000]

18. It is more difficult to walk on the ice than on the road because :

(a) Ice is harder than the road.
(b) The road is harder than the ice.
(c) Ice does not offer any reaction when we push it with our foot.
(d) Ice has a lesser friction than the road.

[U.P.P.C.S. (Pre) 1994]

19. Consider the following statement and conclusions which can be drawn from it. Choose the  correct conclusion.

Statement: In starting a loaded cart, one has to push harder than to keep it moving.
Conclusion :

(a) The weight of a moving object is less.
(b) The wheels tend to slip initially.
(c) There is less friction once the cart starts moving.
(d) Practice makes perfect.

[U.P.P.C.S. (Mains) 2013]

20. For every action there is an equal and opposite reaction. The law was given by :

(a) Newton
(b) Albert Einstein
(c) Bohr
(d) Handane

[U.P. R.O./A.R.O. (Mains) 2017]

21. A man jumped at a speed of 5 meters per second from a stationary boat and the boat moved off at the speed of 0.5 meters per second. How many times is the mass of the boat greater than that of the man?

(a) 5.5 times
(b) 4.5 times
(c) 2.5 times
(d) 10 times

[I.A.S. (Pre) 1994]

22. A truck, a car, and a motorcycle have equal kinetic energies. If equal stopping forces are applied and they stop after traveling a distance of X, Y, and Z respectively, then –

(a) X > Y > Z
(b) X < Y < Z
(c) X = Y = Z
(d) X 4Y 8 Z

[I.A.S. (Pre) 1996]

23. The ratio of kinetic energies of two bodies of the same mass is 4: 9, the ratio of their velocities will be

(a) 4: 9
(b) 2 : 3
(c) 16: 81
(d)√2:√3

[U.P. R.O./A.R.O. (Pre) 2017]

24. Cycles and cars use ball bearings, because-

(a) The actual area of contact between the wheel and axle is increased.
(b) The effective area of contact between the wheel and axle is increased.
(c) The effective area of contact between the wheel and axle is reduced.
(d) None of the above statements is correct.

[I.A.S. (Pre) 2013]

25. A person is sitting in a car which is at rest. The reaction from the road at each of the four wheels of the car is R. When the car runs on a straight level road, how will the reaction at either of the front wheels vary?

(a) It will be greater than R
(b) It will be less than R
(c) It will be equal to R
(d) It shall depend on the material of the road

[I.A.S. (Pre) 2008]

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

(a) Remains horizontal
(b) Is inclined to the horizontal with a smaller depth at the rear end
(c) Is inclined to the horizontal with a larger depth at the rear end
(d) Assumes parabolic curve

[I.A.S. (Pre) 2003]

27. Consider the following statements : A 4-wheel vehicle moving in a sharp circular path at high speed will :

1. Overturn about its outer wheels
2. Overturn about its inner wheels
3. Skid outwards
4. Skid inwards

Which of these statements are correct?

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

[I.A.S. (Pre) 2003]

28. A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because

(a) The batsman did not hit the ball hard enough
(b) Velocity is proportional to the force exerted on the ball
(c) There is a force on the ball opposing the motion
(d) There is no unbalanced force on the ball, so the ball would try to come to rest

[M.P.P.C.S. (Pre) 2017]

29. What is the correct equation for finding the acceleration?

(a) a = v-u/t
(b) a = u + vt
(c) a = v+u/t
(d) a= v+u/2

[U.P.P.S.C. (Pre) 2003]

30. The working principle of a washing machine is :

(a) Centrifugation
(b) Dialysis
(c) Reverse osmosis
(d) Diffusion

[I.A.S. (Pre) 1997, U.P.P.C.S. (Mains) 2004, Uttarakhand Lower Sub. (Pre) 2010]

31. The separation of cream from milk by churning is due to –

(a) Gravitational force
(b) Cohesive force
(c) Centrifugal force
(d) None of the above

[Jharkhand P.C.S. (Pre) 2013]