List of top Physics Questions

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:
Which of the following is a paramagnetic group?
Focal length of a convex lens will be maximum for:
A body is projected at an angle $ \alpha $ from a point O. Its angular momentum will be zero at:
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:
For a coil having L = 2 mH, current flow through it is $I= t^2e^{-l}$ then, the time at which emf become zero
If a ^b aX species emits firstly a positron, then two α and two β and at last one α is also after intially it fainally convets into stable ^c dY species so correct relation will be
For a common emitter circuit if \(\frac{IC}{IE}=0.98\) then current gain for common emitter circuit will be

Following truth table represent which logic gate -

ABC
110
011
101
001

The current (I) in the circuit will be : -
 

current (I) in the circuit
250 N force is required to raise 75 kg mass from a pulley. If rope is pulled 12 m then the load is lifted to 3m, the efficiency of pulley system will be

On the horizontal surface of a truck a block of mass 1 kg is placed (µ = 0.6) and truck is moving with acceleration 5 m/s2 then the frictional force on block will be : -

A disc is rolling the velocity of its centre of mass is Vcm then which one will be correct
Among which the magnetic susceptibility does not depend on the temperature

A charge Q µc is placed at the centre of cube, the flux coming out from any surfaces will be : -

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