List of top Physics Questions

Escape velocity when a body of mass \( m \) is thrown vertically from the surface of the earth is \( v \). What will be the escape velocity of another body of mass 4m thrown vertically?
A particle covers half of the circle of radius \( r \). Then the displacement and distance of the particle are respectively:
The figure below shows currents in a part of electric circuit. The current \( i \) is:
A mass of 0.5 kg moving with a speed of 1.5 m/s on a horizontal smooth surface, collides with a nearly weightless spring of force constant \( k = 50 \, \text{N/m} \). The maximum compression of the spring would be:
A solid sphere is rotating in free space. If the radius of the sphere is increased keeping the mass the same, which one of the following will not be affected?
Consider a pair of insulating blocks with thermal resistances \( R_1 \) and \( R_2 \) as shown in the figure. The temperature \( \theta \) at the boundary between the two blocks is:
A rain drop of radius 0.3 mm has a terminal velocity in air is 1 m/s. The viscosity of air is \( 8 \times 10^{-5} \) poise. The viscous force on it is:
The Young’s modulus of a perfectly rigid body is:
The magnetic field at a distance \( r \) from a long wire carrying current is 0.4 tesla. The magnetic field at a distance \( 2r \) is:
The velocity-time graph of a body moving in a straight line is shown in the figure. Find the displacement and distance travelled by the body in 10 seconds.
In a common base mode of a transistor, the collector current is 5.488 mA for an emitter current of 5.60 mA. The value of the base current amplification factor \( \beta \) will be:
A person swims in a river aiming to reach exactly on the opposite point on the bank of a river. His speed of swimming is 0.5 m/s at an angle of 120° with the direction of flow of water. The speed of water is:
The half-life period and the mean life period of a radioactive element are denoted respectively by \( T_h \) and \( T_m \). Then:
The equivalent capacitance of the combination of the capacitors is:
An electric dipole is kept in a uniform electric field. It experiences:
Which of the following gates will have an output of 1?
Radioactive element decays to form a stable nuclide, then the rate of decay of reactant is shown by:
A point charge \( q \) is rotated along a circle in the electric field generated by another point charge \( Q \). The work done by the electric field on the rotating charge in one complete revolution is:
If the kinetic energy of a free electron doubles, its de-Broglie wavelength changes by the factor:
The ratio of the energies of the hydrogen atom in its first to second excited states is:
The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then:
Two thin lenses are in contact and the focal length of the combination is 80 cm. If the focal length of one lens is 20 cm, then the power of the other lens will be:
The radius of the first zone in a zone plate of focal length 40 cm for light of wavelength 4000 Å is:
Which of the following is an optically active substance?
The acceleration of a frame of reference, fixed on the earth’s surface at the equator and rotating with the earth, once a day will be: