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Q: Which of the following is incorrect statement -
  • A. Gravitational acceleration (g) does not depend on the form, shape and mass of the body.
  • B. Gravitational acceleration (g) is maximum at the poles.
  • C. Gravitational acceleration (g) is minimum at the equator.
  • D. If the lift is moving upwards with an acceleration, the virtual weight of a body is less than its actual weight.
Correct Answer: Option D - Weight of body in lift- (i) When the lift moving upward at a uniform speed, there is no change in the weight of the body. (ii) When the lift goes up at an accelerated speed, the weight of the body increases. The weight of the body decreases while the lift descending at an accelerated speed. (iii) If the lift lanyard (rope) breaks down while descending, the lift falls down in a free state, in which case the body becomes weightless i.e. the weight of the body feels zero. (But not mass)
D. Weight of body in lift- (i) When the lift moving upward at a uniform speed, there is no change in the weight of the body. (ii) When the lift goes up at an accelerated speed, the weight of the body increases. The weight of the body decreases while the lift descending at an accelerated speed. (iii) If the lift lanyard (rope) breaks down while descending, the lift falls down in a free state, in which case the body becomes weightless i.e. the weight of the body feels zero. (But not mass)

Explanations:

Weight of body in lift- (i) When the lift moving upward at a uniform speed, there is no change in the weight of the body. (ii) When the lift goes up at an accelerated speed, the weight of the body increases. The weight of the body decreases while the lift descending at an accelerated speed. (iii) If the lift lanyard (rope) breaks down while descending, the lift falls down in a free state, in which case the body becomes weightless i.e. the weight of the body feels zero. (But not mass)