List of top Physics Questions

If Young’s modulus of elasticity is $Y = \dfrac{2mg l^2}{5b t e}$, where ‘g’ is the acceleration due to gravity, ‘m’ is the mass, ‘l’ is the length, ‘b’ is the breadth, ‘t’ is the thickness and ‘e’ is the elongation, then the value of $k$ is

The figure shows a part of a circuit. The voltage across A and B is 4V. Then the voltages across 2 $\mu$F and 1.5 $\mu$F are respectively

Two equipotential surfaces A and B are separated by a distance x. The work done in moving a charge -q from A to B is (Assume $\varepsilon_0$ = permittivity of free space)

A body executes simple harmonic motion under the action of a force $F_1$ with a frequency $n_1$ and under another force $F_2$ with frequency $n_2$. If both forces act simultaneously in the same direction, the frequency of oscillation of the body is
The waves that are used for line-of-sight (LOS) communication are
A ball of mass 50 g moving with a velocity of 10 ms$^{-1}$ is hit by a bat and the ball retraces back with a velocity of 20 ms$^{-1}$. Then the impulse on the ball is
The ratio of the shortest and the longest wavelengths observed in all the five spectral series of hydrogen spectrum is
A wave is reflected from a rigid support. The change in phase on reflection will be

In the given volume (V) - absolute temperature (T) graph of an ideal gas, the relation between the pressures $ P_1 $ and $ P_2 $ is

In the circuit given below, the charge on the capacitor $ C_1 $ is

The particles with the following speed pass undeflected in the region of crossed fields

A torch bulb rated as 4.5 W, 1.5 V is connected in the circuit as shown in the figure. If the bulb glows with maximum intensity, then the emf (E) is nearly

The existence of neutrino emitted in the β-decay along with electron was predicted by
A capacitor and a resistor are connected in series to an ac source of variable frequency. When the frequency of the ac source becomes $ \frac{1}{3} $rd of its initial value, the current in the circuit decreases by 50%. The power factor of the circuit at the initial frequency is
The relation between focal length (f) and radius of curvature (R) of a spherical mirror is
The materials which can be stretched to cause large strains are called as
An electron, a proton and an alpha particle are moving with same kinetic energy. If $ \lambda_1, \lambda_2, \lambda_3 $ are the de Broglie wavelengths of the electron, proton and alpha particle respectively, then
Two cars of different masses have same kinetic energy, then
For two vectors $ \mathbf{A} $ and $ \mathbf{B} $, if $ \mathbf{A} + \mathbf{B} = |\mathbf{A} - \mathbf{B}| $, then
The force between two spheres with charges +7 $ \mu C $ and -5 $ \mu C $ is F. If each sphere is given an additional charge of +2 $ \mu C $, the new force of attraction will be
A body is projected from the ground with a speed 10 m/s at angle 30° with the horizontal. The height of the body after 5 seconds of its projection is (Acceleration due to gravity = 10 m/s²)
A body of mass 90 g is connected to a string of 100 cm length and whirled in a horizontal circle. If the string can withstand a tension of 2.25 N, then permissible maximum velocity of the body is
A motor cycle of mass 100 kg is moving with a velocity of 15 m/s on a circular path having radius of curvature 20 m. Then the centrifugal force acting on it is (Acceleration due to gravity = 10 m/s²)
A solid sphere of mass 1 kg and radius 25 cm is at rest at the top of an inclined plane of height 175 cm and angle of inclination 30°. If the sphere rolls down without slipping, the maximum velocity of the sphere when it reaches the bottom of the inclined plane is (Acceleration due to gravity = 10 m/s²)
The attenuation of a signal is compensated by