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Physics -- Circular, Rotational and Simple Harmonic Motions
16.
A uniform horizontal metre scale of mass m is suspended by two
vertical strings attached to its two ends. A body of mass 2m is
placed on the 75-cm mark. The tensions in the two strings are in
the ratio
- A.1 : 2
- B.1 : 3
- C.2 : 3
- D.3 : 4
- Answer
- Report
Answer : [A]
17.
The line of action of the resultant of two like parallel forces shifts
by one-fourth of the distance between the forces when the two forces are interchanged. The ratio of the two forces is
- A.1 : 2
- B.2 : 3
- C.3 : 4
- D.3 : 5
- Answer
- Report
Answer : [D]
18.
A uniform metre scale balances at the 40-cm mark when weights of 10 g and 20 g are suspended from the 10-cm and 20-cm marks
respectively. The weight of the metre scale is
- A.50 g
- B.60 g
- C.70 g
- D.80 g
- Answer
- Report
Answer : [C]
19.
Weights of 1 g, 2 g, .., 100 g are suspended from the 1-cm, 2-cm, .., 100-cm marks respectively of a light metre scale. Where should it be supported for the system to be in equilibrium?
- A.55-cm mark
- B.60-cm mark
- C.66-cm mark
- D.72-cm mark
- Answer
- Report
Answer : [C]
20.
A flywheel rotates with a uniform angular acceleration. Its angular velocity increases from 20π rad/s to 40π rad/s in
10 seconds. How many rotations did it make in this period?
- A.80
- B.100
- C.120
- D.150
- Answer
- Report
Answer : [D]
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