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81
The centre of gravity of a triangle is at the point where three
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Answer: Option A
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82
If a flywheel increases its speed from 10 rpm to 20 rpm in 10 seconds, then its angular acceleration is
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Answer: Option C
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83
A ball of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/sec hits an identical stationary ball ‘B’ on the table. If the impact is perfectly plastic, the velocity of the ball ‘B’ just after impact would be
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Answer: Option A
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84
Ball ‘A’ of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/s hits an identical stationary ball ‘B’ on the table. If the impact is perfectly elastic, the velocity of the ball ‘B’ just after impact would be
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Answer: Option C
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85
The diagram showing the point of application and line of action of forces in their plane is called
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Answer: Option B
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86
One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg. The reaction between the sphere and the wall of the arrangement made is
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Answer: Option A
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87
A rigid body suspended vertically at a point and oscillating with a small amplitude under the action of the force of gravity, is called
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Answer: Option B
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88
When a body falls freely under gravitational force, it possesses
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Answer: Option C
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89
Moment of inertia of a squares of side ‘b’ about an axis through its centre of gravity, is
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Answer: Option B
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90
When two forces, each equal to P, act at 90° to each other, then the resultant will be
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Answer: Option B
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