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Physics -- Kinematics and Forces
21.
A strip of wood of length l is placed on a smooth horizontal surface. An insect starts from one end of the strip, walks with
constant velocity and reaches the other end in time t1. It then flies off vertically. The strip moves a further distance l in time t2.
- A.t2 = t1
- B.t2 < t1
- C.t2 > t1
- D.Either (b) or (c) depending on the masses of the insect and the strip
- Answer
- Report
Answer : [C]
22.
In a tug-of-war contest, two men pull on a horizontal rope from
opposite sides. The winner will be the man who
- A.exerts greater force on the rope
- B.exerts greater force on the ground
- C.exerts a force on the rope which is greater than the tension in the rope
- D.makes a smaller angle with the vertical
- Answer
- Report
Answer : [B]
23.
A bicycle moves on a horizontal road with some acceleration. The forces of friction between the road and the front and rear wheels are F1 and F2 respectively.
- A.Both F1 and F2 act in the forward direction.
- B.Both F1 and F2 act in the reverse direction.
- C.F1 acts in the forward direction, F2 acts in the reverse direction.
- D.F2 acts in the forward direction, F1 acts in the reverse direction.
- Answer
- Report
Answer : [D]
24.
An observer moves with a constant speed along the line joining
two stationary objects. He will observe that the two objects (Choose Multiple Answers)
- A.have the same speed
- B.have the same velocity
- C.move in the same direction
- D.move in opposite directions
- Answer
- Report
Answer : [A,B,C]
25.
Which of the following statements are true for a moving body? (Choose Multiple Answers)
- A.If its speed changes, its velocity must change and it must have some acceleration.
- B.If its velocity changes, its speed must change and it must have some acceleration.
- C.If its velocity changes, its speed may or may not change, and it must have some acceleration.
- D.If its speed changes but direction of motion does not change, its velocity may remain constant.
- Answer
- Report
Answer : [A,C]
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