List of top Physics Questions

A block A of mass 1.6 kg is executing SHM with amplitude of 10 cm. A block B of mass 0.9 kg is kept on A. When A passes through its equilibrium, the amplitude of oscillation of the system of block A and B is

If $ q $ is electric charge, $ B $ is magnetic field, $ R $ is the dee radius and $ m $ is the mass of ions, the kinetic energy of the ions in cyclotron is given by:

The de Broglie wavelength of a charged particle accelerated through a potential difference $ V $ is $ \lambda $. If the potential difference is increased by 21%, the de Broglie wavelength of the charged particle is:

In the given pressure ($ P $) - absolute temperature ($ T $) graph of an ideal gas, the relation between volumes $ V_1, V_2, V_3, $ and $ V_4 $ is:

In a hydrogen atom, an electron in an orbit with principal quantum number $ n $ jumps to the first excited state, emitting a photon of wavelength $ \lambda $. Then the value of $ n $ is:

If the speed of a wave doubles as it passes from shallow water into deeper water, its wavelength will be

When an external force with angular frequency $ \omega_0 $ acts on a system of natural angular frequency $ \omega $, the system oscillates with angular frequency $ \omega_d $. The condition for the amplitude of oscillations to be maximum is:

A 50 g ice cube at -10°C is added to 200 g of water at 30°C. The final temperature of the mixture is: (Specific heat of water = 1 cal g$^{-1}$°C$^{-1}$, latent heat of fusion of ice = 80 cal g$^{-1}$, specific heat of ice = 0.5 cal g$^{-1}$°C$^{-1}$)

Positron is the antiparticle of

The material used in the fabrication of infrared LED's is

A gas is compressed from a volume of $23~\text{m}^3$ to $17~\text{m}^3$ at a constant pressure of $50~\text{Nm}^{-2}$. If $50~\text{J}$ of heat is added to the gas, then the change in its internal energy is

Among the following, Ampere’s circuital law is represented by:

Satellites which give high value data for remote sensing, meteorology, and environmental studies are

The time taken by a net force of 10 N to change the velocity by 4 m/s of a body of mass 10 kg is:

According to Newton's law of cooling, the temperature of a body is $ T $ at time $ t $ and the temperature of the surroundings is $ T_s $. The rate of change of temperature is given by \[ \frac{dT}{dt} = k(T_s - T) \] If the initial temperature at time $ t = 0 $ is $ T_0 $, then the temperature $ T $ is:

A work of 166.28 J is done to adiabatically compress one mole of a gas. If the increase in the temperature of the gas is $ 8^\circ C $, the gas is:

Two electric dipoles, each of dipole moment ‘P’, are placed at points A ($a,0$) and B ($-a,0$) as shown in the figure. The work done in rotating both the dipoles through 90° in clockwise direction is (E = Electric field)

For parallel conductors and steady currents, the results in accordan with Newton's third law are

A truck of mass $ M $ and a car of mass $ \frac{M}{10} $ moving with the same momentum are brought to halt by the application of the same breaking force. The ratio of the distances travelled by the truck and car before they come to stop is:

The angle between two vectors $\vec{i} + \vec{j}$ and $\vec{j} + \vec{k}$ is

A 567 W bulb has a tungsten filament of length 40 cm and radius $\dfrac{2}{\pi}$ mm. If the radiation of the filament is 81% of that of a perfect black body, then the temperature of the filament is
(Stefan's constant, $\sigma = 5.67 \times 10^{-8}$ W m$^{-2}$ K$^{-4}$)

A metal wire with circular cross section and length one metre is pulled with tensile force of 1000 N on each side. For the wire to be stretched not more than 0.25 cm, the minimum diameter of the wire required is:
(Young's modulus of the metal $= 10^{11}$ \text{ Pa, take } $\sqrt{\pi} = 1.77$)

A cylindrical rod made of aluminum has length 1 meter and diameter of 10 cm. The rod is subjected to a tensile force of 100 kN. The elongation in the rod is:

When light of wavelength $ \lambda $ incidents on a photosensitive material, photoelectrons are emitted. If the wavelength of the incident light is reduced by 50\%, the maximum kinetic energy of the emitted photoelectrons becomes 3 times the initial maximum kinetic energy. The work function of the material is:

The electric field of an electromagnetic wave propagating in vacuum is given by $E = 35 \cos(kx - 4.5 \times 10^8 t)$ where $E_x$ and $t$ are in V/m and s respectively. The magnitude of the propagation vector $k$ is