List of practice Questions

The total energy of an electron in an orbit of hydrogen atom is \( E \). The potential energy of the electron in the same orbit is
Positron is the antiparticle of
In the given circuit, when \( A = 1 \), \( B = 1 \) the values of \( X \) and \( Y \) respectively are
A = 1, B = 1 the values of X and Y respectively
In a transistor amplifier, the voltage gain is
The radio horizon of the transmission of an antenna placed on the 20\(^\text{th}\) floor in a shopping mall, where the height of each floor is 2 m is
Two metal wires of same length, same area of cross-section have conductivities of their material \( \sigma_1 \) and \( \sigma_2 \). If they are connected in series, the effective conductivity is:
In the circuit, the cells are having negligible resistances. If the galvanometer shows null deflection, then the value of \( V \) is:
galvanometer shows null deflection,
If \( q \) is electric charge, \( B \) is magnetic field, \( R \) is the dee radius and \( m \) is the mass of ions, the kinetic energy of the ions in cyclotron is given by:
Curl the palm of your right hand around the circular wire with the fingers pointing in the direction of current and the thumb gives the direction of the magnetic field. In this case the upper side of the loop may be thought of as:
The Curie temperature \( T_c \) represents:
Physically, the self-inductance plays the role of:
A resistor of 100 \( \Omega \), an inductor of \( \frac{25}{\pi} \) mH, and a capacitor of 0.1 \( \mu \)F are connected in series to an ac source. The impedance of the circuit is minimum for a frequency of:
If the rms speeds of helium and oxygen are equal, then the ratio of the temperatures of helium and oxygen is:
The ratio of radii of two wires is 1:2 and the density of their materials are in the ratio 1:4. If same tension is applied to both the wires then the ratio of the speed of transverse waves produced in them is:
The frequency of a light ray is \( 6 \times 10^{14} \) Hz. Its frequency when it propagates in a medium of refractive index 1.5, will be:
Two charges \( Q \) and \( 4Q \) are separated by a distance of 6 cm. The distance of the point from \( 4Q \) at which the net electric field is zero is:
Inside a charged hollow sphere, at any point the electric field \( E \) and potential \( V \) are:
The equivalent capacitance between A and B in the given figure is:
equivalent capacitance between A and B
A uniform solid sphere of mass \( M \) and radius \( a \) is surrounded by a concentric uniform thin spherical shell of mass 0.5M and radius 1.5a. The gravitational potential energy of a unit mass kept at a distance of 2.5a from the center is:
A cylindrical rod made of aluminum has length 1 meter and diameter of 10 cm. The rod is subjected to a tensile force of 100 kN. The elongation in the rod is:
A large open top water tank is completely filled with water. A small hole of diameter 4 mm is made 10 m below the water level. The flow rate of water through the hole is:
The phenomena of lowering freezing point of water by the application of pressure is known as:
A steel ball of mass 200 g falls freely from a height of 20 m and bounces to a height of 10.8 m from the ground. If the energy lost in this process is absorbed by the ball, the rise in its temperature is:
A work of 166.28 J is done to adiabatically compress one mole of a gas. If the increase in the temperature of the gas is \( 8^\circ C \), the gas is:
In a Carnot’s engine, as the gas absorbs heat energy from the source, then the temperature of the source: