Q. A lift moves downwards with an acceleration of 9.8 m/s². The pressure exerted by a man on the floor of the lift is zero.

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Q. Non-coplaner concurrent forces are those forces which

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Q. Which of the following statement is correct?

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Q. The maximum efficiency of a screw jack is

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Q. The force which acts along the radius of a circle and directed towards the centre of the circle is known as centripetal force.

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Q. Moment of inertia of a triangular section of base (b) and height (h) about an axis through its base, is

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Q. If a number of forces acting at a point be represented in magnitude and direction by the three sides of a triangle, taken in order, then the forces are not in equilibrium.

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Q. The periodic time of a particle with simple harmonic motion is __________ proportional to the angular velocity.

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Q. The motion of a particle round a fixed axis is

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Q. If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.

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Q. The point, through which the whole weight of the body acts, irrespective of its position, is known as

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Q. The loss of kinetic energy during elastic impact is zero.

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Q. The overturning of a vehicle on a level circular path can be avoided if the velocity of vehicle is __________ .

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Q. Which of the following is a scalar quantity?

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Q. The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as

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Q. In ideal machines, mechanical advantage is __________ velocity ratio.

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Q. The minimum force required to slide a body of weight W on a rough horizontal plane is

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Q. The moment of inertia of a square of side a about its diagonal is

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Q. The angular velocity (in rad / s) of a body rotating at N revolutions per minute is

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Q. The maximum efficiency of a lifting machine is

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