321. Minimum number of unequal forces whose vector sum can equal zero is?
(A) 1
(B) 2
C) 3
(D) 4
322. An elevator is moving down with a speed of 9.8 m/sec. The apparent weight of ‘m’ will be:
A. Equal to mg
B. Greater than mg
C. Less than mg
D. Zero
323. An object moves with a constant speed of 1 m/sec in a circle of radius 1 m. The acceleration will be:
A. Zero
B. 1 m/sec²
C. 4π² m/sec²
D. None
324. When a stone of mass ‘m’ at the end of a string is rotated in a vertical circle at a constant speed, then tension in the string:
A. Stays constant
B. Is least at the bottom
C. Is mg
D. Maximum at the bottom
325. If a lift accelerates upwards with acceleration ‘a’, then the apparent weight:
A. Increase by ma
B. Decrease by ma
C. Increase by mg
D. Decrease by mg
326. A body of mass ‘m’ is falling; its weight is:
A. Equal to mg
B. Less than mg
C. Greater than mg
D. Equal to zero
327. The angular displacement by the minute’s hand of a watch after 5.0 minutes is:
A. 30 Degrees
B. 180 Degrees
C. 360 Degrees
D. 120 Degrees
328. The ratio of angular speed of the minute’s hand of a watch to the second hand of the watch is:
A. 60:1
B. 1:60
C. 1:12
D. 21:1
329. A particle rotating in a circular orbit has a frequency of 100 Hz. The angular speed of a particle will be:
A. 100π rad/s
B. 100 rad/s
C. 200π rad/s
D. 200 rad/s
330. A body rotates in a circle under the influence of external torque, the acceleration possessed by the body is:
A. Tangential only
B. Angular only
C. Centripetal only
D. All A, B, and C
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