**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/s
^{2}

**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/s ^{2 }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 = 3t ^{2 }– 2t^{3}**

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 = at ^{3} where a is a constant. Find the velocity as a function of time.**

- v = a.t
^{4}/4 - v = a.3/t
^{2} **v = a.3t**^{2}- v = 3t
^{2}

**Answer :- (3)** **v = a.3t ^{2}**

**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
- Canâ€™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 = 6t ^{2}-t^{3}**

The time in seconds at which the particle will attain zero velocity again, is

- 2
**4**- 6
- 8

**Answer :- (2) 4**