List of top Physics Questions

Two vessels A and B of cross-section as shown in figure contain a liquid upto the same height. As the temperature rises, the liquid pressure at the bottom (neglecting expansion of the vessels) will:

For a gas undergoing an adiabatic process, the relation between temperature and volume is found to be $ T{{V}^{0.4}}= $ constant. This gas must be:

During an experiment, an ideal gas is found to obey an additional law $ V{{P}^{2}}= $ constant. The gas is initially at a temperature T, and volume V. When it expands to a volume 2V, the temperature becomes:

If the distance of the far point for a myopia pa dent is doubled, the focal length of the lens required to cure it will become:

The amplification factor of a triode depends on the:

A body is projected at an angle $ \alpha $ from a point O. Its angular momentum will be zero at:

Which of the following is a paramagnetic group?

Focal length of a convex lens will be maximum for:

The de Broglie wavelength of an electron in the first Bohr orbit is

A magnet is dropped down an infinitely long vertical copper tube. Then

Light appears to travel in straight line because

A whistle revolves in a circle with angular speed $\omega= 20 \,rad/sec$ using a string of length 50 cm. If the frequency of sound from the whistle is 385 Hz, then what is the minimum frequency heard by an observer which is far away from the centre :-$\left( V _{\text {sound }}=340 m / s \right)$

A wave travelling in positive X-direction with a = 0.2 mt., velocity = 360 mt/sec. and $\lambda= 60 \,mts, $ then correct expression for the wave is:-

A solid sphere of radius R is placed on smooth horizontal surface. A horizontal force F is applied at height h from the lowest point. For the maximum acceleration of centre of mass, which is correct?

Unit of Stefan's constant is

In the ideal double-slit experiment, when a glass-plate (refractive index 1.5) of thickness t is introduced in the path of one of the interfering beams (wavelength $\lambda$), the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass-plate is

Two plane mirrors are inclined to each other ray of light incident on one face at $ 30{}^\circ $ after reflection from the second retraces the path. What is the angle between the mirrors?

One end of a copper rod of length 1.0 m and area of cross-section $ {{10}^{-3}}{{m}^{2}} $ is immersed in boiling water and the other end in ice. If the coefficient of thermal conductivity of copper is $ 92\text{ }cal\text{/}m-s\text{ }{}^\circ C $ and the latent heat of ice is $ 8\times {{10}^{4}}cal\text{/}kg, $ then the amount of ice which will melt in one minute is:

A disc is placed on a surface of pond which has refractive index 5/3. A source of light is placed 4 m below the surface of liquid. The minimum radius of disc needed so that light is not coming out is

A particle is projected making an angle of 45$^{\circ}$ with horizontal having kinetic energy K. The kinetic energy at highest point will be

The horizontal range of a projectile is $ 4\sqrt{3} $ times its maximum height, then the angle of projection is

For a coil having L = 2 mH, current flow through it is $I= t^2e^{-l}$ then, the time at which emf become zero

A capacitor of capacity C and reactance X if capacitance and frequency become double then

For a common emitter circuit if \(\frac{IC}{IE}=0.98\) then current gain for common emitter circuit will be