**Q1. A car goes around a flat curved road. Which of the following can provide for the centripetal force? **

- weight
- Friction
- Electrostatic attraction
- Air resistance

**Answer :- (2)**

**Q2. A mass of 100 kg is resting on a rough inclined plane of 60 ^{o}. If the coefficient of friction is 0.5, then the least force acting parallel to the plane to keep the mass in equilibrium is**

- 603.7 N
- 605.5 N
- 500 N
- 100 N

**Answer :- (1)**

**Q3.The inability of body to change its state of uniform motion or rest is known as**

- Law of inertia
- Newton’s third law of motion
- Newton’s law of gravitation
- Newton’s second law of motion

**Answer :- (1)**

**Q4. A train is moving along a horizontal track. A pendolum suspended from the roof of the train makes an angle of 5 ^{o} with the vertical. The acceleration of the train is**

- 0.87 ms
^{-2} - 0.70 ms
^{-2} - 0.60 ms
^{-2} - 1 ms
^{-2}

**Answer :- (1)**

**Q5. A book is lying on the table. What is the angle between the action of the book on the table and reaction of table on the book?**

- Zero degree
- Ninty degree
- Hundred eighty degrees
- Forty five degree

**Answer :- (3)**

**Q6. A lift is moving down with the acceleration 3 m/s ^{2}. A ball is released 1.7 m above the the lift floor. How long will it take to hit the lift floor.**

- 0.5 s
- 1.7 s
- 0.71 s
- 7.1 s

**Answer :- (3)**

**Q7. The SI unit of impolse is**

- Ns
- Nm
^{2} - Nm
- Nm
^{-1}

**Answer :- (1)**

**Q8. After the body starts moving, the friction involved with motion is**

- Static Friction
- Kinetic Friction
- Rolling Friction
- Sliding friction

**Answer :- (2)**

**Q9. When a wheel rolls on a level road, the direction of frictional force at the point of contact of wheel and ground is**

- forward direction
- backward direction
- along the tangent to the wheel
- along the centre of the wheel

**Answer :- (1)**

**Q10. The mass of lift is 1000 kg. The tension in the cable of the lift while the lift is moving upward with the acceleration of 2 ms ^{-2} is:**

- 20000 N
- 9800 N
- 11800 N
- 11000 N

**Answer :- (3)**

**Q11. Which of the following is called a fictitious force?**

- Centripetal force
- Centrifugal force
- Gravitational force
- Frictional force

**Answer :- (2)**

**Q12. A man in the lift weighs more, when the lift**

- begins to go up
- moves up with constant velocity
- moves down with constant velocity
- is in free fall

**Answer :- (1)**

**Q13. If newton is the unit of force in MKS system then, in CGS system 1N= ______ dyne**

- 10
^{5} - 10
^{4} - 10
^{6} - 10
^{3}

**Answer :- (1)**

**Q14. It is easier to roll a cylindrical container than to poll it along the road because**

- Large contact area between cylinder and surface
- Rolling friction is lesser compared to sliding friction
- Sliding friction is more than rolling friction
- Cylindrical container rolls automatically after small push

**Answer :- (2)**

**Q15. When an apple tree is shaken apples are detached from the branches because:**

- There is no option to them except to fall down
- Branches tend to continue in the state of rest and apples go into motion
- Apples experience a net downward poll towards ground
- Apples tend to continue in the state of rest and branches go into motion

**Answer :- (4)**

**Q16.** **A block of mass m is pushed by applying a force F at an angle θ with the horizontal surface. The normal force on the block is given as –**

- F = mg + F sin θ
- F = mg – F sin θ
- F = F sin θ
- F = mg

**Answer :- (1)**

**Q17. A ball of mass 150 g moving at 10 ms ^{-1}is stopped by a force which acts on it for 0.1 s, then the impolsive force is**

- 70N
- 15 N
- 150 N
- 1500 N

**Answer :- (2)**

**Q18. A machine gun has a mass of 20 kg fires 35 g bollets at the rate of 400 bollets per second with a speed of 400ms ^{-1} .What force must be applied to the gun to keep in the position?**

- 5600 N
- 5800 N
- 560 N
- 56 N

**Answer :- (1)**

**Q19. In cgs system the gravitational unit of force is gram weight (g wt).Then 1g wt (or g f) =_______ dyne.**

- 980 dyne
- 9.8 dyne
- 9.8 N
- 980 N

**Answer :- (1)**

**Q20. Which of the conditions shows that the particles are in equilibrium state for two forces F _{1} and F_{2} acting on the body?**

- F
_{1 }= -F_{2} - F
_{1}= F_{2} - 2F
_{1}=F_{2} - F
_{1}= 2F_{2}

**Answer :- (1)**

**Q21. A cyclist bends while taking a sharp turn so that**

- friction is reduced
- component of his weight provides centripetal force
- he can go fast
- it looks nice

**Answer :- (2)**

**Q22. In which direction does the friction act, when a block is moved down the inclined plane?**

- Parallel to inclined plane
- Normal to inclined plane
- Parallel and in upward direction along the inclined plane
- Normal and in upward direction along the inclined plane

**Answer :- (3)**

**Q23. The component of contact force parallel to the surface in contact is called ______ .**

- Reaction force
- Friction
- Gravitational force
- Centrifugal force

**Answer :- (2)**

**Q24. A block of mass 1 kg lies on a horizontal surface in a truck. The coefficient of static friction between the block and the surface is 0.6. If the acceleration of the truck is 5 ms ^{-2}, the frictional force acting on the block is**

- 4 N
- 5 N
- 6 N
- 7 N

**Answer :- (2)**

**Q25. A particle moves in a circle with a constant speed of 6m /s. Its centripetal acceleration is 120 m/s ^{2}, The radius of the circle is**

- 30 cm
- 300 cm
- 20 cm
- 200 cm

**Answer :- (1)**

**Q26. The maximum speed at which a car can turn round a curve of 40 m radius on a level road is: (Given: coefficient of friction between the tyres and road is 0.5)**

- 14 m/s
- 20 m/s
- 21 m/s
- 26 m/s

**Answer :- (1)**

**Q27. The principle of working of a rocket is based on**

- conservation of linear momentum and third law of motion
- conservation of energy
- conservation of mass
- conservation of charge

**Answer :- (1)**

**Q28. If two ends of a spring balance are polled by a force of 10N, then the reading of the spring balance will be**

- 0 N
- 10 N
- 20 N
- 30 N

**Answer :- (2)**

**Q29. Two forces F _{1} and F_{2} are acting on a particle. The particle will remain at rest if two forces are**

- Equal
- Opposite
- Equal and Opposite
- Unequal and in same direction

**Answer :- (3)**

**Q30. A particle moves in a circle of radius 0.30m with a constant speed of 6m/s. Its centripetal acceleration is**

- 20 m/s
^{2} - zero
- 120 m/s
^{2} - 12 m/s
^{2}

**Answer :- (3)**

**Q31. It is advised to drive along the slippery road slowly, because:**

- Friction is reduced
- Normal reaction gets reduced
- water on the road opposes the motion
- advice is not correct

**Answer :- (1)**

**Q32. A body in equilibrium:**

- has two equal forces acting in opposite directions
- has zero resoltant of all the external forces acting on it.
- has external forces balanced by internal forces
- has zero resoltant of all internal forces but not of external ones

**Answer :- (2)**

**Q33. A lift of mass 1000kg , which is moving with an acceleration of 1 m/s ^{2} in upward direction has tension developed in its string equal to:**

- 9800 N
- 10800 N
- 11000 N
- 10000 N

**Answer :- (3)**

**Q34. A body of mass 2kg is hung from a spring balance which is hung vertically in a lift. If the lift falls downward with an acceleration of 9.8m/s ^{2}, then reading of the spring balance is**

- zero
- more than 2 kg
- less than 2 kg but not zero
- 0.2 kg

**Answer :- (1)**

**Q35. An average force of 100N acts on a body to create an acceleration of 1 m/s ^{2} . What is the mass of the body?**

- 0.1 kg
- 10 kg
- 100 kg
- 100000 kg

**Answer :- (3)**

**Q36. If no resoltant force acts on a body then the body will be in**

- rest
- motion
- earlier state (no change in state)
- none of the above

**Answer :- (3)**

**Q37. The product of forceand the duration of time for which it acts on a body is equal to the**

- rate of change of momentum
- change of momentum
- rate of change of acceleration
- change of acceleration

**Answer :- (2)**

**Q38. Another name for the first law of motion is**

- Law of gravitation
- Law of conservation of energy
- Law of inertia
- Law of conservation of energy

**Answer :- (3)**

**Q39. The property of a body due to which it resists any change in its state of rest or of uniform motion is called its:**

- Mass
- Moment of inertia
- Inertia
- Weight

**Answer :- (3)**

**Q40. At which place of the earth, the centripetal force is maximum**

- At the north pole
- At the south pole
- At the equator
- At the earth surface

**Answer :- (3)**