ROTATIONAL MOTION MCQ Quiz: GKFix - Bridge of Knowledge - Page 273

Question 1361

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What happens to the centre of gravity when a body is taken to the moon?

It moves to the centre
It disappears
It remains the same relative to the body
It becomes heavier

Question 1362

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How does the principle of moments apply to the balanced cardboard?

It applies only to liquids
It requires no forces
The sum of clockwise moments equals sum of counterclockwise moments
It doubles the weight

Question 1363

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What is the effect of the pencil's material on balancing the cardboard?

It changes the CG
It alters gravity
Minimal, as long as it provides sufficient reaction force
It makes the experiment invalid

Question 1364

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Why can't a body rotate when net torque is zero?

Because it is too heavy
Because friction stops it
Because there is no angular acceleration
Because gravity vanishes

Question 1365

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What is the significance of the vector sum Σ rᵢ × mᵢg = 0?

It measures speed
It calculates temperature
It defines the location of the centre of gravity
It shows the object is moving