Q. According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through centre of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

View solution

Q. The resultant of two equal forces P making an angle θ, is given by

View solution

Q. The force, by which the body is attracted, towards the centre of the earth, is called

View solution

Q. Coplaner concurrent forces are those forces which

View solution

Q. The power developed by a body acted upon by a torque T newton metre (N - m) and revolving at ω radian/s is given by

View solution

Q. When two elastic bodies collide with each other,

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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.

View solution

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

View solution