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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Q. A machine having an efficiency less than 50%, is known as

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Q. The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called

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Q. The velocity ratio of a differential pulley block with D and d as the diameters of larger and smaller pulley, is

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Q. The unit of mass moment of inertia in S.I. units is kg-m².

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Q. The moment of inertia of a solid cylinder of mass m, radius r and length l about the longitudinal axis or polar axis is

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Q. In a screw jack, the effort required to lift the load is given by(where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

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Q. The terms 'leverage' and 'mechanical advantage' Of a compound lever have got the same meaning.

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Q. A couple produces

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Q. Energy may be defined as the capacity of doing work.

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Q. An irregular body may have more than one centre of gravity.

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Q. The rate of doing work is known as

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Q. In a wormed geared pulley block, if the number of teeth on the worm wheel is doubled, then its velocity ratio is also doubled.

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Q. Moment of inertia of a circular section about its diameter (d) is

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Q. The radius of gyration is the distance where the whole mass (or area) of a body is assumed to be concentrated.

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Q. If three coplaner forces acting on a point are in equilibrium, then each force is proportional to the sine, of the angle between the other two.

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Q. A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of

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Q. When the spring of a watch is wound, it will possess

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Q. For a self locking machine, the efficiency must be

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