List of top Physics Questions

Refractive index of prism is $ \sqrt{2} $. What should be the angle of incidence for a light ray such that the emerging ray grazes out of the surface?

Find $A$ for dispersion without deviation.

Find the angle $A$ of the second prism so that the light ray suffers dispersion without deviation:

A ray parallel to the x-axis (principal axis of curved surface) is incident. The x-coordinate where the ray cuts the x-axis is: (The radius of curvature is 50 cm and $ \mu = 1.5 $).

The minimum deviation produced by a prism is equal to the refracting angle of prism, then choose the range of refractive index ($\mu$) of material of prism:

Power of convex lens is $5$ D. Four students measure object and image distances as shown.

Combination of lenses are arranged in case I and case II as shown in the figure. In case I, $ f_1 = 5 \, \text{cm} $, and in case II, $ f_2 = 4 \, \text{cm} $, the object is at $ -10 \, \text{cm} $. Magnification in two cases are $ m_1 $ and $ m_2 $. Find $ \left| \frac{m_1}{m_2} \right| $.

Two rods of equal length $60\,\text{cm}$ each are joined together end to end. The coefficients of linear expansion of the rods are $24\times10^{-6}\^{\circ}\text{C}^{-1}$ and $1.2\times10^{-5}\^{\circ}\text{C}^{-1}$. Their initial temperature is $30^{\circ}\text{C}$, which is increased to $100^{\circ}\text{C}$. Find the final length of the combination (in cm).

A brass rod is fixed rigidly at two ends at 27$^\circ$C. If it is cooled to temperature -43$^\circ$C, tension in rod becomes T$_{0}$. Find temperature (in $^\circ$C) at which tension will be 1.4 T$_{0}$ :

Find the change in internal energy of gas if its temperature changes by 10K. Number of moles of gas is 10, $ C_P $ (specific heat at constant pressure of the gas) is 7 cal/K-mol and $ R $ (gas constant) = 2 cal/K.

As shown in the figure, six rods of same geometry are connected and maintained at temperatures $100^\circ\text{C}$ and $40^\circ\text{C}$. The temperature at points $A$ and $B$ are:

Hydrogen and oxygen gases have the same RMS speed. If hydrogen gas is at $27^\circ\mathrm{C}$, find the temperature of oxygen gas.

For the following change, \[ \mathrm{H_2O(l)} \xrightarrow[100^\circ C]{5^\circ C} \mathrm{H_2O(g)} \] Select the correct answer:

Match List-I (Isothermal Process) with List-II (work done)

Internal energy of a gas is given as U = 3nRT. 1 mole of He gas takes 126 J of heat and its temperature rises by 4°C. Atmospheric pressure is $P_0 = 10^5$ Pa and area of piston is 17 cm$^2$. Find distance moved by piston.

In an adiabatic process, the temperature reduces to $ \frac{1}{4} $th and volume increases to 8 times. Find the adiabatic constant of the gas.

Two balls made of the same material collide perfectly inelastically as shown. The energy lost in the collision is completely utilized in raising the temperature of each ball. Find the rise in temperature of the balls. (Specific heat $=31$ cal/kg-$^\circ$C):

Find heat given to gas to take it from A to B. (Given: $C_v = 21$ S.I. units, $P_2 = 30$ Pa, $P_1 = 21.7$ Pa, $R = 8.3$ S.I. units, $n = 10$ moles)