List of top Physics Questions

The electric power delivered by a transmission cable of resistance \( R_c \) at a voltage \( V \) is \( P \). The power dissipated is
Mobility \( \mu \) of an electron is related to average collision time \( \tau \) as: \[ \mu = \frac{e \tau}{m} \] (where \( e \) is the electronic charge, and \( m \) is the mass of the electron)
1 g of ice at 0°C is converted into water by supplying a heat of 418.72 J. The quantity of heat that is used to increase the temperature of water from 0°C is (Latent heat of fusion of ice = \( 3.35 \times 10^5 \, {Jkg}^{-1} \)):
In which one among the following cases the convex lens does not give a real image?
A freely suspended needle of a magnetic compass comes to rest along the geographic
The ratio of the velocities of the electron in the second, third and fourth Bohr’s orbits of the hydrogen atom is:
Which of the following is not a measuring function of a multimeter?
The stars appear twinkling. The principle involved in it is
The length of the side of a cube is \( 1.1 \times 10^{-2} \) m. Its volume in \( m^3 \) up to correct significant figures is:
A particle moves under the influence of a force in the XY-plane such that the components of its linear momentum $\vec{p}$ at any time $t$ are given by $p_x = p \sin t$ and $p_y = p \cos t$. The angle between $\vec{F}$ and $\vec{p}$ at that time is

A zener diode of zener voltage 30 V is connected in a circuit as shown in the figure. The maximum current through the Zener diode is:
 

Three capacitances 1 \(\mu\)F, 4 \(\mu\)F, and 5 \(\mu\)F are connected in parallel with a supply voltage. If the total charge flowing through the capacitors is 50 \(\mu\)C, then the supply voltage is:
0.5 mole of \( {N}_2 \) at 27°C is mixed with 0.5 mole of \( {O}_2 \) at 42°C. The temperature of the mixture is:
The kinetic energy of 3 moles of a diatomic gas molecules in a container at a temperature \( T \) is same as that of kinetic energy of \( n \) moles of monoatomic gas molecules in another container at the same temperature \( T \). The value of \( n \) is:
Three identical masses are at the three corners of the triangle, connected by massless identical springs (rest length \( l_0 \)) forming an isosceles right angle triangle. If the two sides of equal length (of length \( 2l_0 \)) lie along the positive x-axis and positive y-axis, then the force on the mass that is not at the origin but on the x-axis is given by \( \hat{i} + \hat{j} \) with \( a \) and \( b \).
A light ray passing along the principal axis of a lens is

If the ratio of lengths, radii and Young's Moduli of steel and brass wires in the figure are $ a $, $ b $, and $ c $ respectively, then the corresponding ratio of increase in their lengths would be:

A parallel plate capacitor is filled by a dielectric whose relative permittivity varies with the applied voltage (U) as $ \epsilon = 2U $. A similar capacitor with no dielectric is charged to $ U_0 = 78 \, \text{V} $. It is then connected to the uncharged capacitor with the dielectric. Find the final voltage on the capacitors.
A convex lens kept in a medium with refractive index less than the refractive index of the lens behaves like
The appearance of red colour of the Sun during Sunrise and Sunset is due to
The formula for refractive index of a prism is
The least distance of distinct vision of a healthy person is
The process of an eye lens to adjust its focal length to form a sharp image on retina is called
The width of the fringes obtained in the Young's double slit experiment is 2.6 mm when light of wavelength 6000$^\circ$A is used. If the whole apparatus is immersed in a liquid of refractive index 1.3 the new fringe width will be:
Two circular coils of radius 'a' and '2a' are placed coaxially at a distance 'x' and '2x' respectively from the origin along the X-axis. If their planes are parallel to each other and perpendicular to the X-axis and both carry the same current in the same direction, then the ratio of the magnetic field induction at the origin due to the smaller coil to that of the bigger one is: