Q1. If the path length covered by a body is zero then
- its displacement is zero.
- the displacement > 0.
- the displacement < 0.
- displacement may or may not be zero.
Answer :- (1) its displacement is zero.
Q2. A man starts from his home with a speed of 4 km/h on a straight road up to his office 5 km away and returns to home, then the path length covered is
- 10 km
- 5 km
- zero
- -5 km
Answer :- (1) 10 km
Q3. Which of the following measurements could be a velocity?
- 5 m North
- 5 m/s North
- 5 s North
- 5 m/s2
Answer :- (2) 5 m/s North
Q4. An object is in uniform motion along a straight line if it
- moves equal distances in unequal intervals of time.
- moves unequal distances in unequal intervals of time
- moves equal distances in equal intervals of time.
- does not move
Answer :- (3) moves equal distances in equal intervals of time.
Q5. An aeroplane lands on a runway with a velocity of 50 m/s. It decelerates at 10 m/s2 to a velocity of 20 m/s. Find the time elapsed.
- 3 s
- 1 s
- 2 s
- 4 s
Answer :- (1) 3 s
Q6. Which of the following quantity remains constant during the uniform circular motion?
- Velocity
- Angular acceleration
- Angular velocity
- Speed
Answer :- (4) Speed
Q7. On acceleration-time graph the area under the curve equals the:
- Displacement
- Change in velocity
- Change in acceleration
- Meaningless
Answer :- (2) Change in velocity
Q8. The position x of a particle varies with time (t) as x = 3t2 – 2t3
The acceleration of the particle will be zero at time
- 1
- 3 / 2
- 1 / 2
- 0
Answer :- (3) 1 / 2
Q9. On acceleration-time graph, a horizontal line indicates:
- zero displacement
- Zero acceleration
- constant velocity
- Constant acceleration
Answer :- (4) Constant acceleration
Q10. The steeper the tangent drawn to the position time graph, the larger will be the speed of the object at that instant. Choose the correct option
- True
- False
- Can’t predict
- none
Answer :- (1) True
Q11. A bullet fired into a fixed target loses half of its velocity after penetrating 3 cm. How much further will it penetrate before coming to rest?
- 1 cm
- 2 cm
- 3 cm
- 4 cm
Answer :- (1) 1 cm
Q12. If a car increases its speed by unequal amounts in equal interval of time, then the car is said to be moving with
- uniform acceleration
- non uniform acceleration
- uniform velocity
- zero velocity
Answer :- (2) non uniform acceleration
Q13. An orange is dropped from a building. One second after dropping the orange, it falls one storey. Two seconds after the orange is dropped, how many stories has it fallen?
- 1 story
- 2 stories
- 3 stories
- 4 stories
Answer :- (4) 4 stories
Q14. bWhat does the slope of a velocity – time represent?
- Displacement
- Momentum
- Acceleration
- Distance
Answer :- (3) Acceleration
Q15. Which of the following quantity remains constant during the uniform circular motion?
- Velocity
- Angular acceleration
- Angular velocity
- Speed
Answer :- (4) Speed
Q16. On velocity-time graph, a horizontal line indicates:
- zero displacement
- zero acceleration
- zero velocity
- constant acceleration
Answer :- (2) zero acceleration
Q17. A stone and a feather are dropped from the same height H=1 m in an evacuated chamber. Which object will reach the bottom of the chamber first?
- The stone reaches the bottom first
- The feather reaches the bottom first
- Both stone and feather reach at the same time
- Cannot answer unless you know the mass of the stone and feather
Answer :- (3) Both stone and feather reach at the same time
Q18. The dimensions of (change in velocity / time) is
- [LT-1]
- [LT-2]
- [L/T-2]
- [L/T-1]
Answer :- (2) [LT-2]
Q19. The magnitude of average velocity is equal to the average speed if the motion of an object is along a straight line and in the same direction.
- True
- False
- sometimes true and sometimes false
- can’t predict
Answer :- (1) True
Q20. The kinematic equation of motion v = u+at is not applicable if :
- acceleration is not constant
- velocity is not constant
- displacement is not constant
- motion is non-uniform.
Answer :- (1) acceleration is not constant
Q21. 36 km/h is equal to:
- 600 ms-1
- 10 ms-1
- 129. 6 ms-1
- 12.96 ms-1
Answer :- (2) 10 ms-1
Q22. Slope of displacement time graph or x-t graph gives us the particles’ ____________.
- Displacement
- Velocity
- Acceleration
- Deceleration
Answer :- (2) Velocity
Q23. The area of acceleration time graph indicates:
- Acceleration
- Average Speed
- Velocity
- Displacement
Answer :- (2) Average Speed
Q24. If the signs of the velocity and acceleration of a particle are the same, the speed of the particle ______________.
- Decreases
- Increases
- Remains same
- Cannot conclude anything
Answer :- (2) Increases
Q25. The motion of a freely falling body is an example of:
- uniformly accelerated motion
- non uniformly accelerated motion
- uniform motion
- none of the above
Answer :- (1) uniformly accelerated motion
Q26. Choose the incorrect statement
- Time rate of change of displacement is called velocity
- Velocity is a vector quantity
- Velocity gives no idea about the direction of motion of the objects
- Velocity can be positive, negative or zero
Answer :- (3) Velocity gives no idea about the direction of motion of the objects
Q27. A train 100 m long is running with speed of 40 km/h. In what time shall it cross a bridge of 1 km length?
- 99 s
- 100 s
- 101s
- 95 s
Answer :- (1) 99 s
Q28. The position of a particle is given by x = at3 where a is a constant. Find the velocity as a function of time.
- v = a.t4/4
- v = a.3/t2
- v = a.3t2
- v = 3t2
Answer :- (3) v = a.3t2
Q29. A ball is thrown vertically upward. At the highest point in its path, which of the following statements is correct?
- The velocity and acceleration are both zero
- The velocity is zero and the acceleration is pointing down
- The acceleration is zero and the velocity is pointing down
- The acceleration is zero and the velocity is pointing up
Answer :- (2) The velocity is zero and the acceleration is pointing down
Q30. Two escalators move people up and down between floors of a shopping mall at the same rate, either up or down. What of the following statements regarding the motion of the escalators is true?
- The escalators have different speeds and velocities.
- The escalators have the same velocity, but different speeds.
- The escalators have the same speed, but different velocities.
- The escalators have the same speed and velocity.
Answer :- (3) The escalators have the same speed, but different velocities.
Q31. If a body does not change its direction during the course of its motion, then
- Path length and displacement are equal
- Path length is greater than displacement
- Displacement is greater than path length
- Path length is either greater or equal to displacement
Answer :- (1) Path length and displacement are equal
Q32. Rain falls at a speed of 50m/s and a child walks on a straight road from east to west at a speed of 100m/s. To find the direction in which the child should hold the umbrella use
- relative speed of child with respect to rain
- relative speed of rain with respect to child
- resultant speed of child and rain
- resultant speed of rain and child
Answer :- (2) relative speed of rain with respect to child
Q33. The velocity-time graph will be a straight line with a non-zero slope for the motion of a ball which is launched vertically up and then comes back down under the influence of gravitational acceleration. Choose the correct option
- True
- False
- Can’t predict
- none
Answer :- (1) True
Q34.The ratio of displacement to distance is
- Less than 1
- Equal to 1
- Greater than 1
- Either less than or equal to 1
Answer :- (4) Either less than or equal to 1
Q35. The speed of an object in a particular direction is called
- uniform speed
- velocity
- distance
- displacement
Answer :- (2) velocity
Q36. For uniform circular motion:
- velocity is along circle and acceleration is towards the centre of circle
- velocity and acceleration is towards the centre of circle
- velocity is along tangent and acceleration is towards the centre of circle
- velocity and acceleration is along the tangent
Answer :- (3) velocity is along tangent and acceleration is towards the centre of circle
Q37. A boy throws up a ball in a stationary lift and the ball returns to his hands in 10 s. Now if the lift starts moving up at a speed of 5 m/s. The time taken for a ball thrown straight up to return to his hands is:
- less than 10 s
- more than 10 s
- equal to 10 s
- insufficient information given
Answer :- (3) equal to 10 s
Q38. Which of the following is not an example of a rectilinear motion?
- A car moving on a straight road
- A rain drop falling towards the earth
- A wooden block sliding down the inclined plane
- A car moving in a circular path
Answer :- (4) A car moving in a circular path
Q39. Two stones of different masses are thrown vertically upward with same initial velocity. Which one will rise to a greater height?
- Stone of lower mass
- Stone of higher mass
- Both will rise to the same height
- Information given is insufficient
Answer :- (3) Both will rise to the same height
Q40. The displacement of a particle starting from rest (at t = 0) is given by s = 6t2-t3
The time in seconds at which the particle will attain zero velocity again, is
- 2
- 4
- 6
- 8
Answer :- (2) 4