List of top Physics Questions

A body of weight \( W \) is suspended from the ceiling of a room through a chain of weight \( w \). The ceiling pulls the chain by a force.
The velocity (\( v \))-time (\( t \)) graph for the motion of a body is a straight line making an angle \( 60^\circ \) with the time axis. Then the body is moving with an acceleration (in m\( s^{-2} \)) of:
If \(\vec{a} = 0.4\hat{i} + 0.3\hat{j} + b\hat{k}\) is a unit vector, then the value of b is

A particular color of light has a wavelength of 663 nm. What is the energy possessed by the light? 
(Planck’s constant $h = 6.63 \times 10^{-34}$ J·s; Velocity of light $c = 3 \times 10^8$ m/s)

Isobars are atoms with the same
The number of significant figures in 0.0500L is
Which one of the following is not a semiconductor?
In a p-n junction diode, reverse biasing
Half-life of radon is 3.5 days. The amount of radon left out of 12 mg mass undecayed after 35 days is nearly
If the nuclear radius of $^{125}_{52}\text{Te}$ is 6 fermi, then the nuclear radius of $^{27}_{13}\text{Al}$ in fermi is
In a nuclear decay, after the emission of one $\alpha$-particle and one $\beta$-particle
When the hydrogen atom is excited from the ground state,
The photoelectric work function for a photosensitive material is 5.2 eV. The energy of the incident radiation for which the stopping potential is 6 V is

If the speed of a moving particle is decreased by 1%, the de Broglie wavelength of the wave associated with it

In Young’s double slit experiment, to change the bandwidth from $\beta$ to $\frac{\beta}{4}$ without changing the experimental setup, the wavelength of light $\lambda$ used must be changed to

If the ratio of amplitudes of two light waves is 2 : 1, then the ratio between the intensities of the two waves is
The correct order of arrangement of electromagnetic waves according to their wavelengths is
The number of windings in the primary and secondary of a transformer are 100 and 2000 respectively. If 50 V a.c is applied to the primary, the potential difference across the secondary is
The magnetic moment $\mu$ associated with a charged particle carrying charge $q$ moving in a circle of radius $a$ with uniform speed $v$ is
The magnetic force acting on a charged particle carrying a charge $3 \mu C$ in a magnetic field of $5$ T acting in the $y$-direction, when the particle velocity is \[ (\hat{i} + \hat{j}) \times 10^5 { ms}^{-1} \] is
Kirchhoff’s junction rule is based on conservation of
Resistivity of a conductor increases with
When \(n\) identical cells are connected in parallel, they give
In bringing a proton towards another proton, the electrostatic potential energy of the system
When a glass rod is rubbed with silk thread, it loses 1000 electrons. Then the charge on the glass rod is (electronic charge $e = 1.6 \times 10^{-19}$ C)