List of top Physics Questions

Match the LIST-I with LIST-II

LIST-I		LIST-II
A.	Boltzmann constant	I.	$ \text{ML}^2\text{T}^{-1} $
B.	Coefficient of viscosity	II.	$ \text{MLT}^{-3}\text{K}^{-1} $
C.	Planck's constant	III.	$ \text{ML}^2\text{T}^{-2}\text{K}^{-1} $
D.	Thermal conductivity	IV.	$ \text{ML}^{-1}\text{T}^{-1} $

Choose the correct answer from the options given below :

Given below are two statements: Statement I : In a vernier callipers, one vernier scale division is always smaller than one main scale division. Statement II : The vernier constant is given by one main scale division multiplied by the number of vernier scale divisions. In light of the above statements, choose the correct answer from the options given below.

A tiny metallic rectangular sheet has length and breadth of 5 mm and 2.5 mm, respectively. Using a specially designed screw gauge which has pitch of 0.75 mm and 15 divisions in the circular scale, you are asked to find the area of the sheet. In this measurement, the maximum fractional error will be $ \frac{x}{100} $, where $ x $ is:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Time period of a simple pendulum is longer at the top of a mountain than that at the base of the mountain.
Reason (R): Time period of a simple pendulum decreases with increasing value of acceleration due to gravity and vice-versa. In the light of the above statements.
choose the most appropriate answer from the options given below:

Two bodies A and B of equal mass are suspended from two massless springs of spring constant $ k_1 $ and $ k_2 $, respectively. If the bodies oscillate vertically such that their amplitudes are equal, the ratio of the maximum velocity of A to the maximum velocity of B is:

A wire of resistance $ X \, \Omega $ is gradually stretched till its length becomes twice its original length. If its new resistance becomes 40 $ \Omega $, find the value of $ X $.

An electron in Bohr model of hydrogen atom makes a transition from energy level $-1.51 \, \text{eV}$ to $-3.40 \, \text{eV}$. Calculate the change in the radius of its orbit. The radius of orbit of electron in its ground state is $0.53 \, \text{\AA}$.

The electric field ($ \vec{E} $) and electric potential ($ V $) at a point inside a charged hollow metallic sphere are respectively:

A capacitor, $ C_1 = 6 \, \mu F $, is charged to a potential difference of $ V_1 = 5 \, \text{V} $ using a 5V battery. The battery is removed and another capacitor, $ C_2 = 12 \, \mu F $, is inserted in place of the battery. When the switch 'S' is closed, the charge flows between the capacitors for some time until equilibrium condition is reached. What are the charges $ q_1 $ and $ q_2 $ on the capacitors $ C_1 $ and $ C_2 $ when equilibrium condition is reached?

Two point charges, 4 µC and -3 µC (with no external field) are placed at (-6 cm, 0, 0) and (6 cm, 0, 0), respectively. The amount of work required to separate the two charges infinitely away from each other will be

A current carrying circular loop of area A produces a magnetic field $ B $ at its centre. Show that the magnetic moment of the loop is $ \frac{2BA}{\mu_0} \sqrt{\frac{A}{\pi}} $.

Two slits 0.1 mm apart are arranged 1.20 m from a screen. Light of wavelength 600 nm from a distant source is incident on the slits. How far apart will adjacent bright interference fringes be on the screen?

A closed organ and an open organ tube filled by two different gases having the same bulk modulus but different densities $ \rho_1 $ and $ \rho_2 $, respectively. The frequency of the 9th harmonic of the closed tube is identical with the 4th harmonic of the open tube. If the length of the closed tube is 10 cm and the density ratio of the gases is $ \rho_1 : \rho_2 = 1 : 16 $, then the length of the open tube is:

A light wave is propagating with plane wave fronts of the type $ x + y + z = \text{constant} $. The angle made by the direction of wave propagation with the $ x $-axis is:

In a resonance tube experiment at one end, resonance is obtained at two consecutive lengths $ l_1 = 100 \, \text{cm} $ and $ l_2 = 140 \, \text{cm} $. If the frequency of the sound is 400 Hz, the velocity of sound is:

The displacement $ x $ versus time graph is shown below.

The displacement $ x $ is plotted against time $ t $. Choose the correct answer from the options given below:

A sub-atomic particle of mass $ 10^{-30} $ kg is moving with a velocity of $ 2.21 \times 10^6 $ m/s. Under the matter wave consideration, the particle will behave closely like (h = $ 6.63 \times 10^{-34} $ J.s)

Two ropes of the same material of radius $ R $ and $ \frac{R}{2} $, what will be the ratio of wave speed in the second rope to the first? (They both are with the same tension)

The amplitude and phase of the wave when two travelling waves given as $ y_1(x, t) = 4 \sin(\omega t - kx) $ and $ y_2(x, t) = 2 \sin\left(\omega t - kx + \frac{2\pi}{3}\right) $ are superimposed.

Displacement of a wave is expressed as $$ x(t) = 5 \cos \left( 628t + \frac{\pi}{2} \right) \, \text{m}. $$ The wavelength of the wave when its velocity is 300 m/s is:

A composite sound wave is represented by $ y = A \cos \omega t \cdot \cos \omega' t $. The observed beat frequency is:

Two plane polarized light waves combine at a certain point, whose "E" components are: \[ E_1 = E_0 \sin \omega t, \quad E_2 = E_0 \sin \left( \omega t + \frac{\pi}{3} \right) \] Find the amplitude of the resultant wave.

The equation of a wave travelling on a string is $ y = \sin[20\pi x + 10\pi t] $, where x and t are distance and time in SI units. The minimum distance between two points having the same oscillating speed is :

The magnetic field of an E.M. wave is given by: \[ \vec{B} = \left( \frac{\sqrt{3}}{2} \hat{i} + \frac{1}{2} \hat{j} \right) 30 \sin \left( \omega \left( t - \frac{z}{c} \right) \right) \] The corresponding electric field in S.I. units is:

A plane electromagnetic wave of frequency 20 MHz travels in free space along the +x direction. At a particular point in space and time, the electric field vector of the wave is $ E_y = 9.3 \, \text{V/m} $. Then, the magnetic field vector of the wave at that point is: