List of practice Questions

A solid cylinder of mass M and radius R rolls without slipping down an inclined plane of length L and height h. What is the speed of its centre of mass when the cylinder reaches its bottom-
When a long spring is stretched by 2 cm, its potential energy is U. If the spring is stretched by 10 cm, the potential energy stored in it will be:
The acceleration due to gravity on the planet A is 9 times the acceleration due to gravity on planet B. A man jumps to a height of 2m on the surface of A. What is the height of jump by the same person on the planet B.
A man weighs 80 kg, he stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5 m/s2. What would be the reading on the scale? (g=10 m/s2) 
The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of  \(_2^4 He\) is (Given: helium nucleus mass ≈ 4.0015 u) 
Barrier potential of a p-n junction diode does not depend on:
If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be:
A n-p-n transistor conducts when
J.J. Thomson's cathode-ray tube experiment demonstrated that
Reverse bias applied to a junction diode
In which of the following systems will be radius of the first orbit (n=1) be minimum:
A stationary particle explodes into two particles of masses m1 and m2 which move in opposite directions with velocities v1 and v2. The ratio of their kinetic energies \(\frac{E_1}{E_2}\) is:
A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then-

The value of Planck's constant is 6.63×10–34Js. The velocity of light is 3.0×108 ms–1. Which value is closest to the wavelength in nanometers of a quantum of light with a frequency of 8×1015 s–1:

What is the entropy change (in JK–1mol–1) when one mole of ice is converted into water at 0ºC?(The enthalpy change for the conversion of ice to liquid water is 6.0 KJ mol–1 at 0ºC)

IUPAC name of the compound given below is:

H3CCH3CH3CH3

The volume occupied by an atom is greater than the volume of the nucleus by a factor of about

The compound on reaction with NaIO4 in the presence of KMnO4 given:

A bar magnet is oscillating in the Earth's magnetic field with a period T. What happens to this period and motion if this mass is quadrupled:
A charged particle moves through a magnetic field in a direction perpendicular to it. Then the

Two spheres of masses m and M are situated in the air and the gravitational force between them is F. The space around the masses in now filled with a liquid of specific density 3. The gravitational force will now be:

A particle of mass m oscillates with simple harmonic motion between points x1 and x2, the equilibrium position being O. Its potential energy is plotted. It will be as given below in the graph:

A charge q is located at the centre of a cube. The electric flux through any face is:
The potential energy of a simple harmonic oscillator when the particle is half way to its end point is:
We consider the radiation emitted by the human body. Which of the following statements is true: