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11
The tension in a cable supporting a lift
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Answer: Option D
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12
Three forces which act on a rigid body to keep it in equilibrium. The forces must be coplanar and
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Answer: Option A
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13
A stone is thrown up a slope of inclination 60° to the horizontal. At what angle to the slope must the stone be thrown so as to land as far as possible from the point of projection ?
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Answer: Option A
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14
Two shots fired simultaneously from the top and bottom of a vertical tower with elevations of 30° and 45° respectively strike a target simultaneously. If horizontal distance of the target from the tower is 1000 m, the height of the tower is
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Answer: Option D
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15
A body of weight 14 g appears to weight 13 g when weighed by a spring balance in a moving lift. The acceleration of the lift at that moment was
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Answer: Option B
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16
A Second's pendulum gains 2 minutes a day. To make it to keep correct time its length
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Answer: Option B
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17
The centre of gravity of a homogeneous body is the point at which the whole
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Answer: Option C
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18
The following is in unstable equilibrium
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Answer: Option C
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19
Time required to stop a car moving with a velocity 20 m/sec within a distance of 40 m, is
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Answer: Option C
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20
A uniform rod 9 m long weighing 40 kg is pivoted at a point 2 m from one end where a weight of 120 kg is suspended. The required force acting at the end in a direction perpendicular to rod to keep it equilibrium, at an inclination 60° with horizontal, is
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Answer: Option C
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