List of top Physics Questions

The electric field required to keep a water drop of mass in just to remain suspended, when charged with one electron:
The best material for the core of a transformer, is
Longitudinal strain is possible in
Light appears to travel in a straight line, because
If a person with a spring balance and a body hanging from it goes up and up in an aeroplane, then the reading of the weight of the body as indicated by the spring balance, will
Heat travels through vaccum by
Gravitational mass is proportional to gravitational
The ratio $C_p /C_v$ for a diatomic gas is more than that for a monotomic gas. The molecules of a monotomic gas have more degree of freedom than those of a diatomic gas.
Newton?? rings are formed in the reflected system. When the space between the lens and the glass plate is filled with a liquid of refractive index greater than that of glass, the central spot of the pattern is bright. This is because the reflections in these cases will be from a denser to a rarer medium and the two interfering rays are reflected under similar conditions.
In series LCR circuit, the resonance occurs at one frequency only. At resonance the inductive reactance is equal and opposite to the capacitive reactance.
According to Maxwell?? hypothesis, a changing electric field gives rise to
A spring $40 \,mm$ long is stretched by the application of a force. If $10 \,N$ force required to stretch the spring through $1 \,mm$, then work done in stretching the spring through $40\, mm$, is
All the resistors are equal in value each being 2 ohm. The equivalent resistance of the combination is:
Velocity of light, according to this theory, is greater in a denser medium than in a rarer medium
Numerical aperture of an oil immersion objective using oil of R.I. 1.5 is 0.75. Then, its numerical aperture, when kept in air is
A mirror produces a magnified erect image of an object. The nature of the mirror is
Time of exposure for a photographic print is 10 s, when a lamp of 50 cd is placed at 1 m from it. Then another lamp of luminous intensity I is used, and is kept at 2 m from it. If the time of exposure now is 20 sec, the value of I is (cd)
A quanity of heat required to change the unit mass of a solid substance, from solid state to liquid state, while the temperature remains constant, is known as
The waves in which the particles of the medium vibrate in a direction perpendicular to the direction of wave motion is known as
If the kinetic energy of a body becomes four times of its initial value, then new momentum will
The dimensions of angular velocity, is
If the equation for the displacement of a particle moving on a circular path is given by $(\theta)=$ $2 t^{3}+0.5$ where $\theta$ is in radians and $t$ in seconds, then the angular velocity of the particleat $t = 2\, sec$, is
A bullet is fired from a rifle. If the rifle recoils freely, then the kinetic energy of the rifle, is
A metal beam having coefficient of linear expansion $ \alpha $ Youngs modulus $ Y $ , area of across section a and length L, is clamped at both ends. After cooling by $ t{}^\circ C, $ the force exerted in the clamp is
A vessel contains a mixture of one mole of oxygen and two moles of nitrogen at 300 K. The ratio of the average rotational kinetic energy per O$_2$ molecule to per N$_2$ molecule is