List of top Physics Questions

The relation between the current $ i $ (in ampere) in a conductor and the time $ t $ (in second) is given by $ i = 12t + 9t^2 $. The charge passing through the conductor between the times $ t = 2 \, \text{s} $ and $ t = 10 \, \text{s} $ is.

Two spherical rain drops of radii in the ratio 4:5 are falling vertically through air. The ratio of the terminal velocities of the rain drops 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:

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:

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:

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:

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

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 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:

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:

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

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:

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 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?

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 $)

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:

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

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

The thickness of a uniform rectangular metal plate is 5 mm and the area of each surface is 3750 cm$^2$. In steady state, the temperature difference between the two surfaces of the plate is 14Â°C. If the heat flowing through the plate in one second from one surface to the other surface is 42 J, then the thermal conductivity of the metal is:

The operation of a nuclear reactor is said to be critical when the value of neutron multiplication factor $ K $ is

If the amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is $ 270 $ nT, the amplitude of the electric field part of the wave is:

An incompressible fluid is flowing through a tube of uniform cross-section. The increase in the power of the pump required to double the rate of flow is: