List of top Physics Questions

According to Bohr atom model, in which of the following transitions will the frequency be maximum ?

Two solids A and B of mass 1 kg and 2 kg respectively are moving with equal linear momentum. The ratio of their kinetic energies (K.E.)A : (K.E.)B will be A/1, so the value of A will be ______

A uniform thin bar of mass 6 kg and length 2.4 meter is bent to make an equilateral hexagon. The moment of inertia about an axis passing through the centre of mass and perpendicular to the plane of hexagon is __________ x 10\^{-1} kg m².

The root mean square speed of molecules of a given mass of a gas at 27°C and 1 atmosphere pressure is 200 m s⁻¹. The root mean square speed of molecules of the gas at 127°C and 2 atmosphere pressure is $ \dfrac{x}{\sqrt{3}} $ m s⁻¹. The value of $ x $ will be __________.

A point charge of +12 µC is at a distance 6 cm vertically above the centre of a square of side 12 cm. The magnitude of the electric flux through the square will be ________ × 10³ Nm²/C.

A cylindrical wire of radius 0.5 mm and conductivity $5 \times 10^7$ S/m is subjected to an electric field of 10 mV/m. The expected value of current in the wire will be $x^3 \pi$ mA. The value of $x$ is ______.

A series LCR circuit is designed to resonate at an angular frequency $ \omega_0 = 10^5 $ rad/s. The circuit draws 16 W power from a 120 V source at resonance. The value of resistance $ R $ in the circuit is _____ Ω.

An electromagnetic wave of frequency 3 GHz enters a dielectric medium of relative electric permittivity 2.25 from vacuum. The wavelength of this wave in that medium will be ________ × 10⁻² cm.

A signal of 0.1 kW is transmitted in a cable. The attenuation of the cable is −5 dB per km and the cable length is 20 km. The power received at the receiver is $10^{-x}$ W. The value of $x$ is __________.

Two cars are approaching each other at an equal speed of 7.2 km/hr. When they see each other, both blow horns having frequency of 676 Hz. The beat frequency heard by each driver will be ______ Hz. [Velocity of sound in air is 340 m/s.]

An electric appliance supplies 6000 J/min heat to the system. If the system delivers a power of 90 W. How long it would take to increase the internal energy by $2.5 \times 10^3$ J ?

A uniform metallic wire is elongated by 0.04 m when subjected to a linear force F. The elongation, if its length and diameter is doubled and subjected to the same force will be ________ cm.

A body of mass 2 kg moving with a speed of 4 m/s makes an elastic collision with another body at rest and continues to move in the original direction but with one fourth of its initial speed. The speed of the two body centre of mass is $\frac{x}{10}$ m/s. Then the value of $x$ is ________.

A source producing sound of frequency 170 Hz is approaching a stationary observer with a velocity of 17 m/s. The apparent change in the wavelength of sound heard by the observer is (speed of sound in air = 340 m/s):

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A particle of mass 10 kg is moving with a velocity of 5 m/s. The kinetic energy of the particle is:

The root mean square velocity of hydrogen molecules at 300 K is 1930 meters/second. The velocity of oxygen molecules at 1200 K will be:

A magnetic field of 5 T is applied perpendicular to a coil with 5 turns. The induced emf in the coil is 10 V. The rate of change of magnetic flux is:

A parallel plate capacitor with air between the plates has a capacitance of 3 μF. Calculate the capacitance if the distance between the plates is reduced by half and the space between them is filled with a substance of dielectric constant $ k $.

A radioactive sample contains 5 × 10$^7$ kg of each of two isotopes A and B with half-lives of 5 days and 8 days respectively. The fraction of A that decays in 3 days after a period of 3 days is:

A string of length 3 m and mass 0.035 kg is stretched with a tension of 50 N. The speed of the wave on the string is:

A body executing SHM has displacement $ y = A \cos \omega t $. Identify the graph which represents the variation of potential energy (PE) as a function of time $ t $ and displacement.

Two point charges $ +3 \, \mu C $ and $ +8 \, \mu C $ repel each other with a force of 40 N. If a charge of $ -5 \, \mu C $ is added to each of them, then the force between them will become:

A sphere rolls down an inclined plane of inclination $ \theta $. What is the acceleration as the sphere reaches the bottom?

A given ray of light suffers minimum deviation in an equilateral prism P. Additional prisms Q and R of identical shape and same material such that P, Q, and R are now combined as shown in figure. The ray will now suffer