List of top Physics Questions asked in JEE Main

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):

Work done in an isobaric process is 100 Joules. If adiabatic constant for the gas is 1.4, find the heat given to the gas.

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

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)

The temperature of 5 moles of an ideal gas increases by 20 K.
Given:
$C_{p} = 9 \text{ cal mol}^{-1}\text{K}^{-1}$, $R = 2 \text{ cal mol}^{-1}\text{K}^{-1}$
The change in internal energy of the gas is:

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

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.

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).

Find work done by gas in cyclic process:

Find change in internal energy of gas if its temperature changes by $10$ K. 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) is $2$ 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:

For the given circuit, if R = 12$\Omega$, balancing length is 180 cm. When value of R is 4 $\Omega$, then balancing length is 120 cm. Find internal resistance of cell E.

If resistance between $A$ and $C$ is increased by $10%$ through heating, then calculate $|V_A - V_B|$.

In a circuit, there is a battery of emf $E$ and internal resistance $r$, connected to an external load resistance $R$ as shown. Find the value of $R$ so that maximum power is dissipated across $R$.

In a series R-L circuit, the voltage of the battery is 10 V. Resistance and inductance are $ 10 \, \Omega $ and $ 10 \, \text{mH} $ respectively. Find the energy stored in the inductor when the current reaches $ \frac{1}{e} $ times of its maximum value.

Figure shows a meter bridge. Initially null point was achieved at a distance of $40\ \text{cm}$. When resistance $16\,\Omega$ is attached in parallel with $R_2$, new balance point was achieved at $50\ \text{cm}$. Then find the values of $R_1$ and $R_2$:

For the given resistive network, the net resistance across $ AB = x $. Then find the value of $ x $.

Figure shows two combinations of real cells with 6 $\Omega$ internal resistance. If reading of ammeters are same in both cases, find the value of 'r'.

There is a galvanometer of resistance $100\Omega$ and full scale current $I_g = 1$ mA. Find shunt resistance required to increase its range to $5$ mA.

Figure shows a meter-bridge. Initially null point was achieved at point P as shown in the figure. When an unknown resistance "R" is connected in parallel with 3$\Omega$ the null point was shifted by 22.5 cm. Then the value of unknown resistance is :

A circular ring and two wires $AC$ and $BC$ are joined as shown in the figure. If all wires have resistance $\lambda\Omega$/m, find the equivalent resistance across $A$ and $B$:

Two resistors of resistances R$_{1}$ = 100$\Omega$ and R$_{2}$ = 100$\Omega$ are connected in series. A voltmeter of resistance 400$\Omega$ is connected in parallel to one of the resistance. Find the reading of voltmeter. The emf of battery is 9V. :

An experiment is performed for comparing EMF of two cells using a potentiometer. For 1st cell, balancing length was achieved at 200 cm and for 2nd cell it was 150 cm. If least count of measurement of length of potentiometer wire is 1cm, the percentage error in the ratio of emf of two cells is :

If equivalent resistance between points A and B is $\frac{X}{5}$ (in $\Omega$), then find value of X:

In a potentiometer, the null point for two resistances $ R_1 $ and $ R_2 $ is at 40 cm as shown. If 16 $ \Omega $ is connected in parallel to $ R_2 $, then the null point is at 50 cm. Find $ R_1 $ and $ R_2 $ respectively.