NEET Physics Motion of Connected Bodies Pulley and Equillibrium of Forces MCQs Set A

a) 24 N

b) 74 N

c) 15 N

d) 49 N

Answer: 24 N

Question: If rope of lift breaks suddenly, the tension exerted by the surface of lift (a = acceleration of lift)

a) 0

b) m(g – a)

c) m(g + a)

d) mg

Answer: 0

Question:  Which equation holds true for the given figure?

a)

b)

c)

d)

Answer:

Question: A monkey is climbing up a rope, then the tension in the rope

a) must be equal to the force applied by the monkey on the rope

b) must be less than the force applied by the monkey on the rope.

c) must be greater than the force applied by the monkey on the rope

d) may be equal to, less than or greater the force applied by the monkey on the rope.

Answer: must be equal to the force applied by the monkey on the rope

Question: When an elevator cabin falls down, the cabin and all the bodies fixed in the cabin are accelerated with respect to

a) man standing on earth

b) ceiling of elevator

c) floor of elevator

d) man standing in the cabin

Answer:  man standing on earth

Question:

a) 45°

b) 0°

c) 90°

d) 30°

Answer: 45°

Question: Which of the following is true about acceleration, a for the system?

a) Acceleration is same and does not depend on whether the force is applied on m₁ or m₂

b) Acceleration depends on the tension in the string

c) Acceleration is more in B, when force is applied on B

d) Acceleration is more in A, when force is applied on A

Answer: Acceleration is same and does not depend on whether the force is applied on m₁ or m₂

Question:

a)

b)

c)

d)

Answer:

Question:  If two masses (M & m) are connected on a horizontal plane and a force is applied on the combination, then the tension T depends on

a) whether force is applied on M or m

b) the force applied on the system

c) Can’t be predicted.

d) both

Answer: whether force is applied on M or m

Question:  A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration 1.0 m/s². If g = 10 ms–2, the tension in the supporting cable is

a) 11000 N

b) 1200 N

c) 9680 N

d) 8600 N

Answer: 11000 N

More Questions.....................................

Question:   A light string ABCDE whose extremity A is fixed, has weights W₁ and W₂ attached to it at B and C. It passes round a small smooth peg at D carrying a weight of 300 N at the free end E as shown in figure. If in the equilibrium position, BC is horizontal and AB and CD make 150° and 120° with CB. Match the columns

a)

b)

c)

d)

Answer:

Question:  Three identical blocks of masses m = 2 kg are drawn by a force F = 10. 2 N with an acceleration of 0. 6 ms^-2 on a frictionless surface, then what is the tension (in N) in the string between the blocks B and C?

a) 3.4

b) 4

c) 9.8

d) 9.2

Answer: 3.4

Question:  A solid sphere of 2 kg is suspended from a horizontal beam by two supporting wires as shown in fig. Tension in each wire is approximately (g = 10 ms^–2)

a) 20 N

b) 10 N

c) 5 N

d) 30 N

Answer: 20 N

Question:  Two blocks of masses 2 kg and 4 kg are attached by an inextensible light string as shown in the figure. If a force of 120 N pulls the blocks vertically upward, the tension in the string is (take g = 10 ms^–2)

a) 40 N

b) 35 N

c) 15 N

d) 20 N

Answer: 40 N

Question: A 1 kg block and a 0.5 kg block move together on a horizontal frictionless surface . Each block exerts a force of 6 N on the other. The block move with a uniform acceleration of

a) 12 ms^-2

b) 6ms^-2

c) 3ms^-2

d) 9 ms^-2

Answer: 12 ms^-2

Question:  A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves downward with an acceleration of 5 m/s2, the reading of the spring balance will be

a) 24 N

b) 74 N

c) 15 N

d) 49 N

Answer: 24 N

Question:  The elevator shown in fig. is descending with an acceleration of 2 m/s². The mass of the block A = 0.5 kg. The force exerted by the block A on block B is

a) 4 N

b) 2 N

c) 6 N

d) 8 N

Answer: 4 N

Question:  A block A of mass 7 kg is placed on a frictionless table. A thread tied to it passes over a frictionless pulley and carries a body B of mass 3 kg at the other end. The acceleration of the system is (given g = 10 ms^–2)

a) 3 ms^–2

b) 30 ms^–2

c) 100 ms^–2

d) 10 ms^–2

Answer: 3 ms^–2

Question:  A triangular block of mass M with angles 30°, 60°, and 90° rests with its 30°–90° side on a horizontal table. A cubical block of mass m rests on the 60°–30° side. The acceleration which M must have relative to the table to keep m stationary relative to the triangular block assuming frictionless contact is

a)

b)

c)

d)

Answer:

Question: When an elevator cabin falls down, the cabin and all the bodies fixed in the cabin are accelerated with respect to

a) None of these

b) man standing in the cabin

c) floor of elevator

d) ceiling of elevator

Answer:  None of these