List of top Physics Questions asked in JEE Main, KCET

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 \(R_2\):
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 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 :

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

In a meter bridge, two balancing resistances are \(30\,\Omega\) and \(20\,\Omega\).
If the galvanometer shows zero deflection for the jockey’s contact point \(P\), find the length \(AP\).

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. 

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 $B$:
 

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'. 

What will be the number of significant figures in the summation of \(0.153,\; 153.2\) and \(153.2\)?
A capacitor of capacitance 10 μF is connected with a battery of emf 6V. Now the battery is disconnected and another uncharged capacitor of capacitance 20 μF is connected to the capacitor. Find the charge on the 20 μF capacitor.
Find the percentage change in height risen by liquid if density of fluid, radius of capillary, and surface tension of liquid are decreased by 1%. Assume contact angle doesn’t change and capillary is of sufficient length.
Statement-1: Kinetic energy of system = \( \frac{1}{2} m_1 v_1^2 + \frac{1}{2} m_2 v_2^2 + \dots + \frac{1}{2} m_n v_n^2 \) Statement-2: Kinetic energy of system = Kinetic energy of center of mass + kinetic energy with respect to center of mass.
In hydrogen type atom, shortest wavelength in Lyman series is given as 91 nm. Then the longest wavelength in Paschen series of this atom shall be
If the string connecting \( m \) and the ground is cut, find the speed with which the \( 2m \) block hits the ground as shown. \( g = 10 \, \text{m/s}^2 \)
Choose the correct graph between time period \( T \) and length of pendulum \( l \).
For the given arrangement of charges, find the strength of electric field \( E \) and potential \( V \) at the geometrical center \( O \).
Which of the following is/are true for YDSE experiment?
Three identical liquid drops, each carrying the same charge, coalesce to form a single drop. The ratio of the potential of the large drop and the smaller drop is \( 3^{1/3} \). Then, \( N \) is:
If position vector is given as \(\vec{r} = x\hat{i} + y\hat{j} + z\hat{k}\) and if its signs are reversed, then which of the following physical quantity remains unaffected?
Find number of photons emitted per second by a light source of wavelength \(663\,\text{nm}\) at power \(6\,\text{mW}\). If \(h = 6.63 \times 10^{-34}\,\text{Js}\) is \(N \times 10^{15}\), then find \(N\).
Block of mass \(3\,\text{kg}\) is connected to a flywheel of mass \(3\,\text{kg}\) and radius \(5\,\text{m}\) through a massless string wrapped around the flywheel. Find kinetic energy (in J) of flywheel when block descends by \(3\,\text{m}\).
Find time taken by the block to reach the bottom.
Mass number of a nucleus is \(\alpha\) and its radius is \(R_\alpha\). Radius of another nucleus of mass number \(\beta\) is \(R_\beta\). If \(\beta = 8\alpha\), then find \(\dfrac{R_\alpha}{R_\beta}\).
For a particle moving in x-direction according to the relation \(x = 4t^3 - 3t\), consider the following statements:

[(a)] At \(t = 0.866\), \(x = 0\)
[(b)] Direction of velocity of particle remains same
[(c)] Direction of velocity of particle changes at \(x = -1\)
[(d)] Direction of velocity of particle changes at \(x = 0.5\,\text{m}\)
[(e)] Acceleration is non-negative
Correct statements are:
If percentage increase in Young's modulus \(Y\) is \(1%\), percentage increase in density of material is \(0.5%\) and longitudinal wave traveling in a metallic bar has wave velocity of \(400\,\text{m/s}\), then find final velocity of the wave.