List of top Physics Questions

Two spheres of masses $m$ and $M$ are situated in 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 :
The potential energy of a simple harmonic oscillator when the particle is half way to its end point is - (where, $E$ is the total energy)
The acceleration due to gravity becomes $\left(\frac{g}{2}\right)$ where (g = acceleration due to gravity on the surface of the earth) at a height equal to
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 $2\, m$ on the surface of $A.$ What is the height of jump by the same person on the planet $B$.
An equiconvex lens is cut into two halves along (i) $XOX'$ and (ii) $YOY'$ as shown in the figure. Let ${f, f', f'' }$be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively.
Choose the correct statement from the following
A wire is suspended by one end. At the other end a weight equivalent to 20 N force is applied. If the increase in length is 1 mm, the increase in the energy of the wire will be
A spring balance and a physical balance are kept in a lift. In these balances equal masses are placed. lf now the lift starts moving upwards with constant acceleration, then
A sample of radioactive element has a mass of $10\, g$ at an instant $t = 0$. The approximate mass of this element in the sample after two mean lives is
A particle is thrown vertically upwards. Its velocity at half of the height is $ 10\, ms^{ - 1} $ . Then the maximum height attained by it is (Take $g = 10\,ms^{ -2} $ )
Barrier potential of $a p-n$ junction diode does not depend on
A man weighs $80\, kg$. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of $5 \,ms^{-2}$ What would be the reading on the scale? ($g = 10\, ms^{-2})$
An observer moves towards a stationary source of sound with a speed $1 / 5\, th$ of the speed of sound. The wavelength and frequency of the source emitted are $\lambda$ and $f$ respectively. The apparent frequency and wavelength recorded by the observer are respectively
The kinetic energy of $1 \,g$ molecule of a gas, at normal temperature and pressure is $( R = 8.31 \,J \, mol^{-1} \, K^{-1} )$
Consider a compound slab consisting of two different materials having equal thickness and thermal conductivities $K$ and $2K$ respectively. The equivalent thermal conductivity of the slab is
When a car moves on a road with uniform speed of $30\,km /h$, then the net resultant force on the car is
A ball rolls without slipping. The radius of gyration of the ball about an axis passing through its center of mass is $K$. If radius of the ball be $R,$ then the fraction of total energy associated with its rotational energy will be
The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of $^{4}_{2}He$ is Given, mass of helium nucleus $\approx4.0015 u.$
A ball is projected horizontally with a velocity of $4\,m s^{-1}$ from the top of a tower. The velocity of the ball after 0.7 s is (Take g = 10 $m s^{-2}$)
Which of the following phenomenon exhibits particle's nature of light ?
Graph of input characteristic of common emitter amplifier is
$8$ bits form
In the depletion region of an unbiased $p-n$ junction diode, there are
Electrons with de-Broglie wavelength $ \lambda $ fall on the target in an $X-ray$ tube. The cut-off wavelength of the emitted $X-rays$ is
An inductive coil has a resistance of $100 \, \Omega $ When an AC signal of frequency $1000\, Hz$ is applied to the coil, the voltage leads the current by $ 45^{\circ} $ . The inductance of the coil is
A solid sphere of mass $2\, kg$ rolls up a $ 30^{\circ} $ incline with an initial speed of $10 \,m/s$. The maximum height reached by the sphere is $(g = 10\,m/s^2)$