BITSAT Physics Motion In A Straight Line MCQs

Question: A frictionless wire AB is fixed on a sphere of radius R. A very small spherical ball slips on this wire. The time taken by this ball to slip from A to B is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: A 2 m wide truck is moving with a uniform speed v₀ = 8 m/s along a straight horizontal road. A pedestrain starts to cross the road with a uniform speed v when the truck is 4 m away from him. The minimum value of v so that he can cross the road safely is 

• a) 2.62 m/s
• b) 4.6 m/s
• c) 3.57 m/s
• d) 1.414 m/s

Answer: 3.57 m/s

Question: A body is thrown vertically upwards from A, the top of the tower, reaches the ground in time t¹. If it is thrown vertically downwards from A with the same speed, it reaches the ground in time t². If it is allowed to fall freely from A, then the time it takes to reach the ground is given by

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: A ball is released from the top of height h metre. It takes T second to reach the ground. Where is the ball at the time T/2 sec :

• a) At (h/4) m from the ground
• b) At (h/2) m from the ground
• c) At (3h/4) m from the ground
• d) Depends upon the mass and volume of the ball

Answer: At (3h/4) m from the ground

Question: A particle is moving in a straight line with initial velocity and uniform acceleration a. If the sum of the distance travelled in t^th and (t + 1)^th seconds is 100 cm, then its velocity after t seconds, in cm/s, is 

• a) 80
• b) 50
• c) 20
• d) 30

Answer: 50

Question: The position x of a particle varies with time (t) as x = A t² – B t³. The acceleration at time t of the particle will be equal to zero. What is the value of t?

• a)

  

• b)

  

• c)

  

• d) zero

Answer:

Question: The velocity acquired by a body moving with uniform acceleration is 30 ms^-1 in 2 seconds and 60 ms^-1 in four seconds .The initial velocity is

• a) 4 ms^–1
• b) 0 ms^–1
• c) 2 ms^–1
• d) 10 ms^–1

Answer: 0 ms^–1

Question: A balloon starts rising from the ground with an acceleration of 1.25 ms^–2. After 8 s, a stone is released from the balloon. The stone will (Taking g = 10 m s^–2)

• a) Begin to move down after being released
• b) Reach the ground in 4 s
• c) Cover a distance of 40 m in reaching the ground
• d) Will have a displacement of 50 m

Answer: Reach the ground in 4 s

Question: A bus starts moving with acceleration 2 m/s². A cyclist 96 m behind the bus starts simultaneously towards the bus at 20 m/s. After what time will he be able to overtake the bus?

• a) 4 sec
• b) 8 sec
• c) 12 sec
• d) 16 sec

Answer: 8 sec

Question: A body, thrown upwards with some velocity reaches the maximum height of 50m. Another body with double the mass thrown up with double the initial velocity will reach a maximum height of

• a) 100 m
• b) 200 m
• c) 300 m
• d) 400 m

Answer: 200 m