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🔥Laws of Motion Multiple Choice Question| Set C🔥
Q.1 A player catches a ball of 200g moving with a speed of 20 m/s . If the time taken to complete the catch is 0.5 s , the force exerted on the players hand is
(A) 8 N
(B) 4 N
(C) 2 N
(D) 0
Q.2 If force F = 500 -100t, then impulse as a function of time will be:
(A) 500t - 50t²
(B) 50t - 10
(C) 50 - t²
(D) 100t²
Q.3 If the force on a rocket moving in force free space with an exhaust velocity of gases 300 m/s is 210 N, then the rate of combustion of the fuel, is m:
(A) 0.7 kg/s
(B) 1.4 kg/s
(C) 2.7 kg/s
(D) 10.7 kg/s
Q.4 bullet strike per second elastically on a wall and rebound. What will be the force exerted on the wall by bullets if mass of each bullet is :
(A) mnv
(B) 4mnv
(C) 2mnv
(D) mnv/2
Q.5 A person is standing in an elevator. In which situation he finds his weight less?
(A) when the elevator moves upward with constant acceleration
(B) when the elevator moves downward with
constant acceleration
(C) the elevator moves upward with uniform
velocity
(D) when the elevator moves downward with uniform velocity
Q.6 A 150g tennis ball coming at a speed of 40 m/s is hit straight back by a bat to speed of 60 m/s. The magnitude of the average force F on the ball, when it is in contact for 5 ms with the bat is:
(A) 2500 N
(B) 3000 N
(C) 3500 N
(D) 4000 N
Answer
Q.1 (A)
Q.2 (A)
Q.3 (A)
Q.4 (C)
Q.5 (B)
Q.6 (B)