Q. The centre of gravity of a triangle lies at a point where its medians intersect each other.

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Q. In order to double the period of simple pendulum, the length of the string should be

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Q. The moment of inertia of a square of side a about its base is a⁴/ 3.

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Q. If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys

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Q. The time of flight (t) of a projectile on a horizontal plane is given by

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Q. The velocity ratio for the third system of pulleys is

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Q. If the gravitational acceleration at any place is doubled, then the weight of a body will be

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Q. The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is

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Q. The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

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Q. Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

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Q. If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

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Q. Efficiency of a screw jack is given by(where α = Helix angle, and φ = Angle of friction.)

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Q. When a train is rounding a curve, the side thrust on the wheel flanges is prevented by raising the outer edge of the rail.

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Q. Frequency of vibrations means the number of cycles per second.

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Q. The time taken by a particle for one complete oscillation is known as periodic time.

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Q. The velocity ratio of a first system of pulleys with 4 pulleys is

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Q. One joule means that

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Q. The moment of inertia of a sphere of mass m and radius r, about an axis tangential to it, is

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Q. The velocity ratio for the first system of pulleys is(where n is the number of pulleys.)

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Q. The ideal angle of banking provided on the curves on roads depends upon

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