List of top Physics Questions

If the frequency of the incident light on a metal surface is increased by 10%, then the kinetic energy of the emitted photoelectrons is increased from 0.5 eV to 0.7 eV. Then the work function of the metal is:
In an Young double slit experiment without varying the distance of the screen and the slit separation, if the wavelength of monochromatic source is changed one by one in the ratio 2:3:4, then the corresponding fringe widths measured will be in the ratio:
The equipotential surface is:
The ratio of the respective rms velocities of the gas molecules of an ideal gas at 327°C and at 627°C is:
The ratio of the velocities of the electron in the second, third and fourth Bohr’s orbits of the hydrogen atom is:
A proton with kinetic energy of 2 MeV is describing a circular path of radius \( R \) in a uniform magnetic field. The kinetic energy of the deuteron to describe the same circular path in the same field is:
A body of mass \( M \) is at equilibrium under the action of four forces \( F_1, F_2, F_3 \), and \( F_4 \). If \( F_1 \) is removed from the body, then the body moves with an acceleration of:
If an ideal engine needs to transmit a torque of 200 Nm to maintain a rotor at a uniform angular speed of 300 rads\(^{-1}\), then the power required for the engine is:
If an ideal gas, in an insulated vessel, is allowed to expand into another similar evacuated vessel through a valve then:
The total energy of a gas mixture of one mole of oxygen and 3 moles of argon at a temperature \( T \) by neglecting vibrational modes is:
Two spheres A and B having respective charges 6 C and 12 C placed at a distance \( d \) repel each other by a force \( F \). The charge given to sphere A to reverse the force as \( -F \) is:
The de Broglie wavelength associated with the electrons accelerated by a potential of 81 V is lying in the region of electromagnetic waves:
Two gases under the same thermal conditions have the same number of molecules per unit volume. If the respective molecular diameters of the gases are in the ratio 1 : 3, then their respective mean free paths are in the ratio:
Two straight long parallel wires carrying equal amounts of current in opposite directions placed 5 cm apart repel each other by a force \( F \). If the current in one of the wires is doubled and reversed, then the force between them is:
A man fires bullets at two hillocks, one shorter and the other taller. The taller one is behind the smaller one. If the first echo is heard after 6 s and the second echo after 12 s, then the distance between the hillocks is (velocity of sound in air = 330 m/s):
If a body at rest undergoes one dimensional motion with constant acceleration, then the power delivered to it at a time \( t \) is proportional to:
In a Carnot engine, the temperature of the sink is 350 K. If the efficiency of the engine is 50%, the temperature of the source should be:
In an LCR resonance circuit at resonance frequency \( \omega_0 \), the quality factor \( Q \) is:
The analogy between linear motion and rotational motion are given. The FALSE one is:
If the power of a lens is -2.0 D, then the type and focal length \( f \) of the lens are:
Find the TRUE statement of the algebraic operations of scalar and vector quantities.
If a freely falling body covers 80 m in the first 4 seconds, then in the next 4 seconds it covers a distance of:
The mutual inductance between a pair of coils A and B placed close to each other depends upon:
The work done by a source in taking unit charge from lower to higher potential energy is called the source's:
At what distance above and below the surface of the earth a body will have the same weight (take radius of earth as R)?