List of top Physics Questions

The given four terminal network is part of a larger circuit. The points $A, B, C$ are at the same potential. The potential difference between any one of $A, B $ or $C$ and $D$ is $40\, V$. The potential difference between $A$ and $O$ is
A $p-n$ photodiode is made of a material with a band gap of $2\, eV$. The minimum frequency of the radiation that can be absorbed by the material is nearly (he = 1240 eV nm)
A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of $3 \times 10^6 \, ms^{-1}. $ The velocity of the particle is (mass of electron=$9.1 \times 10^{-31} \, kg) $
On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are 39$^{\circ}$W and 239$^{\circ}$W respectively. What will be the temperature on the new scale, corresponding to a temperature of 39$^{\circ}$C on the Celsius scale?
The energy required to charge a parallel plate condenser of plate separation d and plate area of cross-section A such that the uniform electric field between the plates is E, is
The ground state energy of hydrogen atom is -13.6 eV. When its electron is in the first excited state, its excitation energy is
The resistance of a metal increases with increasing temperature because
A circular disc of radius 0.2 meter is placed in a uniform magnetic field of induction $\frac{1}{\pi}\big(\frac{Wb}{m^2}\big)$ in such a way that its axis makes an angle of 60$^{\circ}$ with $\overrightarrow{B}$ . The magnetic flux linked with the disc is
In an a.c. circuit the emf (e) and the current (i) at any instant core given respectively by \(e = E_0 sin ωt\), \(I = I_0 sin (ωt – ɸ)\). The average power in the circuit over one cycle of a.c. is.
A closed mesh has a potential \( V' \), current \( I \), and resistance \( R \). If \( V' = 0.5 \,\text{V} \), \( I = 0.1 \,\text{A} \), and \( R = 20 \,\Omega \), the total voltage \( V \) is:
Work done to rotate a dipole from \( \theta_{1} = 0^\circ \) to \( \theta_{2} = 60^\circ \) is \( W \). The work required to rotate it to \( 180^\circ \) is:
The frequency of a light wave in a material is \( 2 \times 10^{14} \,\text{Hz} \) and wavelength is \( 5000 \,\text{\AA} \). The refractive index of material is:
A nuclear reaction is given by \( {}_{Z}X^{A} \rightarrow {}_{Z+1}Y^{A} + {}_{-1}e^{0} + \bar{\nu} \). This reaction represents:
The escape velocity from the surface of the earth is \( v_{e} \). The escape velocity from the surface of a planet whose mass and radius are 3 times those of the earth will be:
The velocity of sound in air at STP is 332 m/s. The velocity of sound in air at \( 27^\circ \text{C} \) is:
The magnetic susceptibility of a paramagnetic material at \( -73^\circ \text{C} \) is 0.0075. Its value at \( -173^\circ \text{C} \) will be:
A particle moves in a circle of radius 25 cm at two revolutions per second. The acceleration of the particle in \( \text{m/s}^{2} \) is:
The power of a water pump is 2 kW. If \( g = 10 \text{ m/s}^{2} \), the amount of water it can raise in one minute to a height of 10 m is:
Which of the following is not an electromagnetic wave?
The escape velocity of a body from the surface of the earth is 11.2 km/s. If a body is projected with a velocity twice the escape velocity, then the velocity of the body far away from the earth will be:
The focal length of a convex lens is minimum for:
If the temperature of a hot body is increased by 50%, the amount of radiation emitted by it increases by approximately:
A source of frequency 500 Hz emits waves of wavelength 0.4 m. How long does it take the wave to travel 600 m?
The dimensional formula for Impulse is same as that of:
A copper wire and a steel wire of same length and same cross-section are joined end to end to form a composite wire. The composite wire is stretched by a force. The ratio of elongation in copper to steel is ($Y_{steel} = 2 \times 10^{11} \text{ Pa}, Y_{copper} = 1.1 \times 10^{11} \text{ Pa}$):