(Set 3) Force and Law of Motion

Q1. 
A person is standing on a frictionless horizontal ground. How can he move by a certain distance on this ground
  1. By sneezing
  2. By jumping
  3. By junning
  4. by rolling

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Correct Answer : A

Q2. 
The movement of a horse lawn carriage is an example of which principle of physics.
  1. Newton's third Law
  2. Ohm's Law
  3. Archimedes Principle
  4. Avogadro's Law

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Correct Answer : A

Q3. 
In cricket match, while catching a fast moving ball, a fielder in the ground gradually pulls his hands backwards with the moving ball to reduce the velocity to zero. The act represents
  1. Newton's first law of motion
  2. Newton's Second law of Motion
  3. Newton's third law of motion
  4. Law of conservation of energy

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Correct Answer : B

Q4. 
A bullet of mass 10 g is fired with a velocity of 20 m/s from a gun of mass 2 kg. Find the recoil velocity (in m/s) of the gun.
  1. 1
  2. 0.2
  3. 0.1
  4. 2

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Correct Answer : C

Q5. 
Conservation of momentum in a collision between particles can be understood on the basis of
  1. Newton's First law of Motion
  2. Newton's Second law of Motion
  3. Both Newton's second law of motion and Newton's third law of motion
  4. conservation of energy

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Correct Answer : C

Q6. 
A man is at rest in the middle of a horizontal plane of perfectly smooth ice. He can move himself to the shore by making use of Newton's
  1. first law
  2. second law
  3. third law
  4. All of this

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Correct Answer : C

Q7. 
A person throws an object on a horizontal frictionless plane surface. It is noticed that, there are two forces acting on this object (a) gravitational pull and (b) normal reaction of the surface. According to the third law of motion, the net resultant force is zero. Which one of the following can be said for the motion of the object?
  1. The object will move with acceleration.
  2. The object will move with deceleration.
  3. The object will move with constant speed but varying direction.
  4. the object will move with constant velocity.

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Correct Answer : D

Q8. 
The impulse on a particle due to a force acting on it during a given time interval is equal to the change in its
  1. force
  2. momentum
  3. work done
  4. energy

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Correct Answer : B

Q9. 
A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to
  1. exert large force on the ball
  2. reduce the force exerted by the ball on hands
  3. increase the rate of change of momentum
  4. decrease the rate of change of momentum

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Correct Answer : B

Q10. 
The quantity 'weight' is measured by
  1. beam balance
  2. common balance
  3. spring balance
  4. balance wheel

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Correct Answer : C

Q11. 
A man weighing 70 kg is coming down in lift. If the cable of the lift breaks sudden, the weight of the man would become
  1. 70 kg
  2. 35 kg
  3. 140 kg
  4. zero

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Correct Answer : D

Q12. 
Rough surfaces have
  1. high friction
  2. very low friction
  3. no friction
  4. none of these

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Correct Answer : A

Q13. 
On applying brakes, the car stops, due to .........
  1. Central force
  2. centrifugal force
  3. inertia
  4. friction

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Correct Answer : D

Q14. 
We slip on a muddy road due to
  1. gravitational forces.
  2. relative velocity
  3. lack of friction
  4. excess of friction

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Correct Answer : C

Q15. 
Angle of friction and angle of repose are
  1. equal to each other
  2. not equal to each other
  3. proportional to each other
  4. None of the above

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Correct Answer : A

Q16. 
Consider a vehicle going on a horizontal road towards east. Neglect any force by the air. The frictional force on the vehicle by the road
  1. is zero if the vehicle is moving with a non-uniform velocity
  2. is towards east if the vehicle is accelerating
  3. must be towards east
  4. must be towards west

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Correct Answer : B

Q17. 
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?
  1. It will be greater than R
  2. It will be less than R
  3. It will be equal to R
  4. It shall depend on the materials of the road

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Correct Answer : A

Q18. 
The friction of ball bearing in a wheel is
  1. to increase friction
  2. to convert kinetic friction into rolling friction
  3. to convert static friction into kinetic friction
  4. just for convenience

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Correct Answer : B

Q19. 
Railway tracks are banked on curves so that
  1. necessary centrifugal force may be obtained from the vertical component of the weight of the train
  2. no frictional force may be produced between the tracks and the wheels of the train
  3. necessary centripetal force may be obtained from the horizontal component of the weight of the train
  4. the train may not fall down inwards

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Correct Answer : C

Q20. 
Ball bearing are used in bicycles, cars, etc because
  1. the actural area of contact between the wheel and axle is increased
  2. the effective area of contact between the wheel and axle is increased
  3. the effective area of contact between the wheel and axle is reduced
  4. none of these

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Correct Answer : C

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