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Physics -- Kinematics and Forces
1.
A bird flies for 4 s with a velocity of |t - 2| m/s in a straight line, where t = time in seconds. It covers a distance of
- A.2m
- B.4m
- C.6m
- D.8m
- Answer
- Report
Answer : [B]
2.
A particle has an initial velocity of 9 m/s due east and a constant acceleration of 2 m/s2 due west. The distance covered by the particle in the fifth second of its motion is
- A.0
- B.0.5
- C.2m
- D.none of these
- Answer
- Report
Answer : [B]
3.
A particle moves in a straight line with a retardation proportional to its displacement. Its loss of kinetic energy for any displacement x is proportional to
- A.x
- B.x2
- C.ln x
- D.ex
- Answer
- Report
Answer : [B]
4.
For a particle moving along a straight line, the displacement x depends on time t as x = αt3 + βt2 + γt + δ. The ratio of its initial acceleration to its initial velocity depends
- A.only on α and β
- B.only on β and γ
- C.only on α and γ
- D.only on α
- Answer
- Report
Answer : [B]
5.
Water drops fall at regular intervals from a roof. At an instant when a drop is about to leave the roof, the separations between 3 successive drops below the roof are in the ratio
- A.1 : 2 : 3
- B.1 : 4 : 9
- C.1 : 3 : 5
- D.1 : 5 : 13
- Answer
- Report
Answer : [C]
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