Question Library

The escape velocity of an object from the gravitational field of a planet I. Increases with the mass of the object II. Increases with the mass of the planet III. Is smaller on the moon than on the earth. Which of the above statements is/are correct?

Which of the following is a non-renewable energy source?

An object of mass 5.0 cg moving with a velocity of 12ms-1 due north hits a stationary body of mass 7.0kg. If they stick together after collision and move with velocity V due north, calculate the magnitude of V.

Which of the following statements is/are correct in any machine? I. The velocity ratio is usually greater than the mechanical advantage. II. Efficiency work inputwork outputIII. The velocity ratio is independent of friction.

A box is pulled a distance s along a smooth horizontal floor by a force of magnitude F, inclined at an angle θ to the horizontal. The work done is

Three non-parallel coplanar forces which can be represented both in magnitude and direction by the three sides of a triangle taken in order will

A constant force acts on a body of mass 50kg and changes its speed from 20ms-1 to 90ms-1 in 10 seconds. Calculate the magnitude of the force applied.

The wave theory of light does not explain photoelectricity because

A stone thrown horizontally from the top of a vertical ice is completely melted. Determine the total mass of wall with a velocity of 15ms\(^{-1}\), hits the horizontal ground water in the container at a point 45m from the base of the wall. Calculate the specific latent heat of steam = 2.3 x 10\(^3\) Jg\(^{-1}\) height of the wall. [g = 10ms\(^{-2}\)]

A ball is projected specific latent heat of ice = 3.4 x 10\(^{2}\) Jg\(^{-1}\) horizontally from a height of 20m above the ground specific heat capacity of water = 4.2 Jg\(^{-1}\) K\(^{-1}\) with an initial velocity of 0.4ms\(^{-1}\). Calculate the horizontal distance moved by the ball before hitting the ground. [g = 10ms\(^{-1}\)]

State (a) the principle upon which the lightening in fluorescent tubes operate; (b) two factors on which the colour of light from a fluorescent tube depends.

(a) Define Young modulus of elasticity; (b) A spiral spring extends from a length of 10.0 cm to 10.01 cm when a force of 20 N is applied on it. Calculate the force constant of the spring.

(a) Define elastic limit (b) State Hookes laws of elasticity

Using the kinetic theory of matter, explain the definite structure of solids.

(a) Sketch a diagram of a simple pendulum performing simple harmonic motion and indicate positions of maximum potential energy and kinetic energy. (b) A body moving with simple harmonic motion in a straight line has velocity, v and acceleration, a, when the instantaneous displacement, x in cm, from its maximum position is given by x = 2.5 sin 0.4 \(\pi t\), where t is in seconds. Determine the magnitude of the maximum (i) veloxity; (ii) acceleration (c) A mass m attached to a light spiral is caused to perform simple harmonic motion of frequency f = \(\frac{1}{2 \pi} \sqrt{\frac{k}{m}}\), where k is the force constant of the spring. (i) Explain the physical significance of \(\sqrt{\frac{k}{m}}\). (ii) If m = 0.30 kg, k = 30Nm\(^{-1}\) and the maximum position is 0.015m, calculate the maximum; (i) kinetic energy (ii) tension in the spring during the motion [g = 10 ms\(^{-1}\), \(\pi\) = 3.142]