List of top Physics Questions

In an LC oscillator, if the values of inductance and capacitance become twice and eight times, respectively, then the resonant frequency of the oscillator becomes $ x $ times its initial resonant frequency $ \omega_0 $. The value of $ x $ is:

The ratio of intensities at two points $ P $ and $ Q $ on the screen in a Young's double-slit experiment, where the phase difference between two waves of the same amplitude are $ \frac{\pi}{3} $ and $ \frac{\pi}{2} $, respectively, is:

A disc is rolling without slipping on a surface. The radius of the disc is $ R $. At $ t = 0 $, the topmost point on the disc is $ A $ as shown in the figure. When the disc completes half of its rotation, the displacement of point $ A $ from its initial position is:

An object moves with speed $ v_1 $, $ v_2 $, and $ v_3 $ along a line segment $ AB $, $ BC $, and $ CD $ respectively as shown in the figure. Where $ AB = BC $ and $ AD = 3 AB $, then the average speed of the object will be:

At any instant the velocity of a particle of mass 500g is $ \left( 2t \hat{i} + 3t^2 \hat{j} \right) \, \text{ms}^{-1} $. If the force acting on the particle at $ t = 1 $ s is $ \left( \hat{i} + x \hat{j} \right) \, \text{N} $, then the value of $ x $ will be:

The effect of an increase in temperature on the number of electrons in the conduction band ($ n_e $) and the resistance of a semiconductor will be as follows:

The resistance of a wire is $ 5 \Omega $. What will be its new resistance in ohms if stretched to 5 times its original length?

A 100m long wire having cross-sectional area $ 6.25 \times 10^{-4} \, {m}^2 $ and Young's modulus is $ 10^{10} \, {Nm}^{-2} $ is subjected to a load of 250N, then the elongation in the wire will be:

The free space inside a current carrying toroid is filled with a material of susceptibility $ \chi = 2 \times 10^{-2} $. The percentage increase in the value of magnetic field inside the toroid will be:

A radioactive material is reduced to $ \frac{1}{8} $ of its original amount in 3 days. If $ 8 \times 10^{-3} $ kg of the material is left after 5 days, what was the initial amount of the material?

Which of the following Maxwell's equations is valid for time varying conditions but not valid for static conditions:

Why did the time period of rotation of Earth decrease by microseconds after the Japan 2011 earthquake?

The force between two small charged spheres having charges of $ 1 \times 10^{-7} $ C and $ 2 \times 10^{-7} $ C placed 20 cm apart in air is:

A conducting loop of radius $ \frac{10}{\sqrt{\pi}} $ cm is placed perpendicular to a uniform magnetic field of 0.5T. The magnetic field is decreased to zero in 0.5 s at a steady rate. The induced emf in the circular loop at 0.25s is:

Two planets $ A $ and $ B $ have radii $ R $ and $ 1.5R $, and densities $ \rho $ and $ \frac{\rho}{2} $ respectively. The ratio of acceleration due to gravity at the surface of $ B $ to $ A $ is:

In a reflecting telescope, a secondary mirror is used to:

A charged particle is moving in a uniform magnetic field $ \mathbf{B} = 2\hat{i} + 3\hat{j} $ T. If it has an acceleration of $ \mathbf{a} = \alpha\hat{i} - 4\hat{j} $ m/s², then the value of $ \alpha $ will be:

The ratio of the speed of sound in hydrogen gas to the speed of sound in oxygen gas at the same temperature is:

In a current carrying coil of inductance 60 mH,the current is changed from 2.5 A in one direction to 2.5 A in the opposite direction in 0.10 sec. The average induced EMF in the coil will be:

At a certain depth "$d$" below surface of earth, value of acceleration due to gravity becomes four times that of its value at a height $3 R$ above earth surface Where $R$ is Radius of earth (Take $R =6400\, km$ ) The depth $d$ is equal to

A parallel plate capacitor consists of two square metal plates 5.0 cm of side and separated by 1 cm. A sulphur slab of thickness 5 mm is placed on the lower plate. What will be the capacitance of the capacitor? (Dielectric constant of sulphur = 4)

Light of wavelength $ \lambda_A $ and $ \lambda_B $ falls on two identical metal plates A and B respectively. The maximum kinetic energy of photoelectrons is $ K_A $ and $ K_B $ respectively. Given that $ \lambda_A = 2\lambda_B $, which one of the following relations is true?

An electron (mass = $ 9 \times 10^{-31} $ kg, charge = $ 1.6 \times 10^{-19} $ C) moving with a velocity of $ 10^6 $ m/s enters a magnetic field. If it describes a circle of radius $ 0.1 $ m, then the strength of the magnetic field must be:

A square frame of side $ 10 $ cm and a long straight wire carrying current $ 1A $ are in the plane of the paper. Starting from close to the wire, the frame moves towards the right with a constant speed of $ 10 $ m/s (see figure). The induced EMF at the time the left arm of the frame is at $ x = 10 $ cm from the wire is:

In YDSE, how many maximas can be obtained on a screen, including central maxima, on both sides of the central fringe if $ \lambda = 3000$ Å, $ d = 5000$ Å?