List of top Physics Questions

A ball of mass 200 g moving with certain velocity collides with another ball of mass 600 g at rest. If the coefficient of restitution is 0.6, the ratio of the velocity of 600 g ball after collision and the velocity of 200 g ball before collision is:

Two positive point charges are separated by a distance of 4 m in air. If the sum of the two charges is $ 36 \mu C $ and the electrostatic force between them is $ 0.18 $ N, then the bigger charge is:

Match the devices given in List I with their uses given in List II:

A solid sphere rolls down without slipping from the top of an inclined plane of height 28 m and angle of inclination 30Â°. The velocity of the sphere when it reaches the bottom of the plane is (Acceleration due to gravity $ g = 10 \, \text{m/s}^2 $)

Consider an isolated system of two concentric spherical black bodies. The inner sphere of radius $ R $ is at temperature $ T $, and the outer sphere of radius $ 4R $ is at temperature $ 2T $. The rate of absorption of radiant energy by the outer sphere is:

A black body at a temperature of 125$^\circ$C emits heat at the rate of 32 W. The rate of heat emitted by the body when the temperature of the body is increased by 398 K is:

After the decay of a single $ \beta^- $ particle, the parent and daughter nuclei are?

A block of mass 2 kg is tied to one end of a 2 m long metal wire of 1.0 mmÂ² area of cross-section and rotated in a vertical circle such that the tension in the wire is zero at the highest point. If the maximum elongation in the wire is 2 mm, the Young's modulus of the metal is:

The displacement of a particle in simple harmonic motion is given by: \[ x = A_0 \cos \left( \frac{\pi}{2} t \right) \] The distance traveled by the particle in the interval between $ t = 2 $ and $ t = 5 $ seconds and its position at $ t = 5 $ second are:

A cell of emf 2 V is connected to an external resistor. If the current through the resistor is 200 mA and the terminal voltage of the cell is 87.5% of the emf of the cell, then the internal resistance of the cell is:

The gas that gives the highest fractional conversion of heat to work in an isobaric process is:

An alphabet 'a' made of two similar thin uniform metal plates of each length $ L $ and width $ a $ is placed on a horizontal surface as shown in the figure. If the alphabet is vertically inverted, the shift in the position of its center of mass from the horizontal surface is:

Resonance phenomenon is exhibited by a circuit only if:

The escape speed of a body from the surface of the earth is 11.2 km/s. The escape speed of a body from the surface of a planet whose mass is 8 times that of the earth and mean density same as that of the earth is:

Young's double slit experiment is performed with monochromatic light of wavelength $ 6000 \text{Ã…} $. If the intensity of light at a point on the screen where the path difference is $ 2000 \text{Ã…} $ is $ I_1 $ and the intensity of light at a point where path difference is $ 1000 \text{Ã…} $ is $ I_2 $, then the ratio $ I_1: I_2 $ is:

The refractive index of the material of a small angled prism is $ 1.6 $. If the angle of minimum deviation is $ 4.2^\circ $, the angle of the prism is?

The maximum range of a projectile is 80 m. If the projectile is projected with the same speed at an angle of $ \frac{\pi}{12} $ with the horizontal, then the range of the projectile is:

A current $ i $ flows through a circular loop of radius $ R $. The ratio of the magnetic field produced at its centre to the field produced at a point at a distance $ \frac{R}{\sqrt{3}} $ from its centre on its axis is:

Magnetic field on the axis of a short bar magnet of magnetic moment $ M $, at a distance $ x $ from its centre is:

The most exotic diamagnetic materials are:

A current $ i $ flows through a circular loop of radius $ R $. The ratio of the magnetic field produced at its centre to the field produced at a point at a distance $ \frac{R}{\sqrt{3}} $ from its centre on its axis is:

A voltmeter of resistance $400 \, \Omega$ is used to measure the emf of a cell with an internal resistance of $4 \, \Omega$. The error in the measurement of emf of the cell is:

The electric flux due to an electric field \[ \vec{E} = (8\hat{i} + 13\hat{j}) \text{ NC}^{-1} \] through an area 3 m$^2$ lying in the XZ plane is:

In a time ‘’t", the amplitude of vibrations of a damped oscillator becomes half of its initial value, then the mechanical energy of the oscillator decreases by:

A constant force of \[ \mathbf{F} = (8\hat{i} - 2\hat{j} + 6\hat{k}) \text{ N} \] acts on a body of mass 2 kg, displacing it from \[ \mathbf{r_1} = (2\hat{i} + 3\hat{j} - 4\hat{k}) \text{ m to } \mathbf{r_2} = (4\hat{i} - 3\hat{j} + 6\hat{k}) \text{ m}. \] The work done in the process is: