List of top Physics Questions

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 \( \left| \frac{m_1}{m_2} \right| \).

A prism with angle of prism 75° and having refractive index \(\sqrt{3}\) has a slab of refractive index 1.5 kept on one side of the prism as shown. Find angle of incidence such that TIR occurs at slab prism interface. (Given sin 15° = 0.25 and sin 25° = 0.43) :

The refractive index of a 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?

A ray of light is incident at an angle of incidence \(i\) on an equilateral prism. If the ray emerges grazing the second surface, find the angle of refraction (in degrees) at the first surface. Refractive index of the prism is \(\sqrt{2}\).

Light is incident at such an angle so that minimum deviation takes place. Now a film of refractive index RI = \(n/2\) is stick on other face such that total internal reflection takes place on second surface. Find angle of prism :

When an object is kept at distance 8 cm and 24 cm from a convex lens, magnitude of magnification is same in both cases. Find focal length (in cm) of the lens :

Two media of refractive indices $n_1$ and $n_2$ have a plane interface. In the first medium, speed of light is $2.4\times10^8$ m/s and in the second medium, it is $2.8\times10^8$ m/s. Find the critical angle when light travels from 1st medium to 2nd medium:

Find \(A\) for dispersion without deviation.

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?

Focal length of objective lens and eyepiece lens are 1.25 cm and 5 cm and tube length is 26 cm. Find magnification of compound microscope in normal adjustment.

Find magnification due to lens:

Given: \[ R_1 = 15\,\text{cm}, \quad R_2 = 12\,\text{cm}, \quad \text{Object distance } = 30\,\text{cm} \]

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 \( \mu = 1.5 \)).

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:

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.

One mole of a diatomic gas is expanding isothermally from V to 2V at 27°C. If the magnitude of work done by gas in this case is same as the work done in an adiabatic process where initial temperature is 27°C and final temperature is T. Find T in °C.

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

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.

Find work done by gas in cyclic process:

Match the column with the correct numerical values of energy/heat in column-II (R is universal gas constant)