List of top Physics Questions

A ball of mass 10g is dropped from a height of 50m. If 30J energy is lost due to air resistance, then what is the velocity of the ball when it hits the ground?

Find the magnification of a lens having focal length 5 cm (Least distance of distinct vision = 25 cm).

A wire of length 1m is clamped at half of its length. If the fundamental frequency is 3kHz, then find the velocity.

Specific heat capacity of diatomic gas at constant volume:

Find the frequency of the waveform shown in the graph.

If \(T\) and \(n\) are surface tension and coefficient of viscosity, if temperature increases, then:

A body is rotated about a fixed axis. Which of the following is correct about angular velocity?

Young's modulus and shear modulus are applicable for:

The force between two point charges separated by a distance \(d\) is \(F\). If one charge is moved away by a distance \(d\), then the new force is:

If a p-n junction diode is forward biased, then:

A particle moves along the x-axis and has its displacement x varying with time t according to the equation \( x = c_0 (t^2 - 2) + c (t - 2)^2 \) where \( c_0 \) and \( c \) are constants of appropriate dimensions. Then, which of the following statements is correct?

An electric bulb rated as 100 W-220 V is connected to an ac source of rms voltage 220 V. The peak value of current through the bulb is :

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 :

Pressure of an ideal gas, contained in a closed vessel, is increased by 0.4% when heated by \( 1^\circ \text{C} \). Its initial temperature must be :

A motor operating on 100 V draws a current of 1 A. If the efficiency of the motor is 91.6%, then the loss of power in units of cal/s is

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : If oxygen ion (O\(^{-2}\)) and Hydrogen ion (H\(^{+}\)) enter normal to the magnetic field with equal momentum, then the path of O\(^{-2}\) ion has a smaller curvature than that of H\(^{+}\).
Reason R : A proton with same linear momentum as an electron will form a path of smaller radius of curvature on entering a uniform magnetic field perpendicularly.
In the light of the above statements, choose the correct answer from the options given below

Light from a point source in air falls on a spherical glass surface (refractive index, \( \mu = 1.5 \) and radius of curvature \( R = 50 \) cm). The image is formed at a distance of 200 cm from the glass surface inside the glass. The magnitude of distance of the light source from the glass surface is 1cm.

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The Bohr model is applicable to hydrogen and hydrogen-like atoms only. Reason R : The formulation of Bohr model does not include repulsive force between electrons. In the light of the above statements, choose the correct answer from the options given below :

Using a battery, a 100 pF capacitor is charged to 60 V and then the battery is removed. After that, a second uncharged capacitor is connected to the first capacitor in parallel. If the final voltage across the second capacitor is 20 V, its capacitance is : (in pF)

A monochromatic light of frequency \( 5 \times 10^{14} \) Hz travelling through air, is incident on a medium of refractive index '2'. Wavelength of the refracted light will be :