List of top Physics Questions

A simple pendulum of length 1m is released from horizontal position. If 20% its initial energy is lost due to air resistance in reaching the mean position, then the speed of the bob of the pendulum at mean position is (Acceleration due to gravity = 10 m s\textsuperscript{-2})
The work done to take a body of mass 100 kg to the top of a building of height 20 m is (Acceleration due to gravity = 10 m s\textsuperscript{-2})
A block of mass 2 kg is kept on a rough horizontal surface. If a horizontal force of 4 N is applied on the block, then the acceleration of the block is (Coefficient of static friction between the block and the surface is 0.3)
A swimmer who can swim in still water at a speed of 20 kmph wants to cross a river flowing at speed of 10 kmph along shortest path, then the angle with the direction of flow in which he has to swim is
If \(\sigma\) denotes Stefan constant and S denotes heat capacity, then the dimensional formula of \(\frac{\text{S}}{\sigma}\) is
A body moving along a straight line path travels first 10 m distance in a time of 3 seconds and the next 10 m distance with a velocity of 5 m s\textsuperscript{-1}. The average velocity of the body is
If a bullet of mass 2 g travels with velocity of 3 × 103 cm s-1, its wavelength (in m) is: (h = 6.6 × 10-34 Js)

In the given circuit, the input voltage across base resistance 10V. If base-emitter and collector-emitter voltages are zero, then the current amplification factor of the transistor is:

If the junction diodes $D_1$ and $D_2$ in the given circuit are ideal, then the forward biased resistance and reverse biased resistance is infinity:

The ratio of the wavelengths of the spectral lines in the Lyman series of the hydrogen spectrum when the transitions take place from 7th and 9th states to the ground state is:
In a photoelectric experiment, when the wavelength of the incident light on a metal is λ, the maximum kinetic energy of the emitted photoelectron is E. When the wavelength of incident light is \(\frac{\lambda}{3}\), the maximum kinetic energy of the emitted photoelectron becomes 4E. The work function of the metal is:
If the magnitude of the electric field of an electromagnetic wave in a medium is given by E = 107 sin(6 × 108 t - 0.01x) N C-1, then the frequency and speed of the electromagnetic wave respectively are: (In the equation x is in metre and t is in second)
The magnetic field at the centre of a circular coil of radius 10 cm, having 250 turns and carrying a current of \(\frac{8}{\pi}\) A is:

The ratio of the currents i$_1$, i$_2$ and i$_3$ in the circuit is:

If five parallel plate capacitors are connected to the battery of 240 V as shown in the figure, the charge on 1$\mu$F capacitor is:

A vehicle moves on a banked curve of radius \( r \) with banking angle \( \theta \). What is the speed \( v \) of the vehicle to avoid slipping without friction?
Three point charges +Q and +q are placed on x-axis at distances 0, d/2, and d respectively from the origin. If the resultant electrostatic force on the charge +Q placed at x = 0 is zero, then the value of q is:
If the intensities of two interfering light waves in a medium are I and 4I, then the maximum and minimum intensities are respectively:
The mean translational kinetic energy of a gas molecule at a temperature of 47 $^\circ$C is: (Boltzmann constant = 1.38 $\times$ 10$^{-23}$ J K$^{-1}$)
If the differences between the specific heat capacities at constant pressure and constant volume of hydrogen and another gas are in the ratio 16 : 1, then the other gas is:

Two moles of an ideal gas undergoes a cyclic process as shown in the figure. If AB is an isothermal process at 223 $^\circ$C, then the net work done in the complete cycle is nearly: (Universal gas constant = 8.3 J mol$^{-1}$ K$^{-1}$ and take ln(2) = 0.7)

If the relation of the absolute temperature (T) and volume (V) of an ideal gas which expands adiabatically is T ∝ 1 / √V, then the ratio of the specific heat capacities of the gas is:

An incompressible fluid is flowing through a horizontal Y-shaped tube as shown in the figure. The velocity (v) of the fluid in the tube of area of cross-section 1.5A m$^2$ is:

Three steel rods having lengths 1L, 3L, 3L and cross-sectional areas A, 2A, 3A respectively are joined in the form of a single rod. If the cross rod is subjected to a stretching force F, then the increase in length is: (Y = Young's modulus of steel)
The time period of oscillations of a spring of force constant 65 N m-1 with its upper end fixed to a rigid support and carrying a mass of 650 g at its lower end is: