List of top Physics Questions

A resistor of $ 10 \, \Omega $ is connected in series with a 12 V battery. What is the current flowing through the resistor?

A 5 $ \, \text{kg} $ mass is moving at a speed of $ 10 \, \text{m/s} $. What is the kinetic energy of the mass?

When we push a wooden crate on the concrete floor, then which of the following statements is true?

If the speed of a vehicle increases by 2m/s, its kinetic energy is doubled. Then, the original speed of the vehicle is:

An $LCR$ series $AC$ circuit is at resonance with $10\, V$ each across $L, C$ and $R$. If the resistance is halved, the respective voltages across $L, C$ and $R$ are

In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume that all layers are thin)?

Two magnets of equal magnetic moment ($ m_1 = m_2 $) are placed as shown in the figure. If the magnetic field intensity at P due to magnet A1 is $ 2 \times 10^{-3} \, \text{Tesla} $, then find out the total magnetic field intensity at P due to both the magnets.

A uniform electric field E-3×10⁵NC^-1 is acting along the positive Y-axis. The electric flux through a rectangle of area 10cm × 30 cm whose plane is parallel to the Z-X plane is

A particle of mass 500 g is at rest. It is free to move along a straight line. The power delivered to the particle varies with time according to the following graph :
The momentum of the particle at t=5s is

A convergent beam of light passes through a diverging lens of focal length $0.2\, m$ and comes to focus $0.3\, m$ behind the lens. The position of the point at which the beam would converge in the absence of the lens is

A point charge A of +10µC and another point charge B of +20µC are kept Im apart in free space. The electrostatic force on A due to B is $\overrightarrow{F_1}$, and the electrostatic force on B due to A is $\overrightarrow{F_2}$. Then

Show that the wavelength of electromagnetic radiation is equal to the de Broglie wavelength of its quantum (photon).

The current drawn by the primary of a transformer, which steps down $200\,V$ to $20\,V$ to operate a device of resistance $20\,\Omega $. is (Assume the efficiency of the transformer to be $80\, \%$)

A body has a charge of -3.2μC . The number of excess electrons it has is

The angular velocity of earth's rotation about its axis is $'\omega'.$ An object weighed by a spring balance gives the same reading at the eiquator as at a height 'h' above the poles. The value o f 'h' will be

An electric blub of 60 W, 120 V is to be connected to 220 V source. What resistance should be connected in series with the bulb, so that the bulb glows properly?

A particle moves in xy plane according to the law x = a sin ωt and y = a(1 - cos ωt), where a and w are constant. The particle traces

Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards as shown in Fig. 9.29. A current in the coil produces a deflection of 3.5o of the mirror. What is the displacement of the reflected spot of light on a screen placed 1.5 m away?

Current flows through uniform, square frames as shown in the figure. In which case is the magnetic field at the centre of the frame not zero?

Among two discs $A$ and $B$, first has radius $10 \,cm$ and charge $ 10^{-6} \mu C$ and second has radius $30 \,cm$ and charge $10^{-5}C$ . When they are touched, charges on both are, $q_{A}$ and $q_{B}$ respectively, will be

The graphs shows, angular velocity as a function of time. In which one is the magnitude of the angular acceleration constantly decreasing?

The ratio of the respective de Broglie wavelengths associated with electrons accelerated from rest with the voltages 100 V, 200 V and 300 V is

A cube of side 1 cm contains 100 molecules each having an induced dipole moment of 0.2×10^-6C-m in an external electric field of 4NC^-1. The electric susceptibility of the materials is_____ C2N^-1m^-2

A cell of constant emf first connected to a resistance $ {{R}_{1}} $ and then connected to a resistance $ {{R}_{2}} $ . If power delivered in both cases is same, then the internal resistance of the cell is

An electron moves in a circle of radius $1.0 \,cm$ with a constant speed of $ 4.0\times {{10}^{6}}m/s $ , the electric current at a point on the circle will be $ (e=1.6\times {{10}^{-19}}C) $