List of practice Questions

A potentiometer is considered a versatile and accurate device to make an electrical measurement of EMF. Why?
At a distance \( r \), two equal charges are kept and they exert a force \( F \) on each other. What is the force acting on each charge, if the distance between them is doubled and charges are halved?
What does an electric dipole experience when it is kept in a non-uniform electric field?
For a hollow spherical shell, potential \( V \) changes with respect to distance \( r \) from the centre. Which graph from the following represents this?
What will be the flux coming out of any surface of a cube, if a charge \( Q\,\mu\text{C} \) is placed at the centre of the cube?
The image formed by the convex mirror is \( \frac{1}{n} \) times the object and has a focal length \( f \). What is the distance of the object from the mirror?
Which of the following does not exhibit polarization?
A spring has a spring constant \( k \). When the spring is stretched through 1 cm, the potential energy is \( U \). What will be the potential energy if it is stretched by 4 cm?
Efficiency of a Carnot heat engine working between the temperatures \(27^\circ \text{C}\) and \(227^\circ \text{C}\) is –
Which of the following is the largest unit of energy?
Curie temperature is the temperature above which –
What is the time taken by a particle executing SHM with a time period \( T \) sec from a positive extreme position to half of the amplitude?
When the angle of contact between a solid and a liquid is \( 90^\circ \), then
Choose the correct statement
The total energy of a rolling ring of mass \( M \), velocity \( V \), and radius \( R \) is -
The equation of trajectory of a projectile is given by \( y = x - 10x^2 \). Its speed of projection is – \((g = 10 \, \text{m/s}^2)\)
What happens to the weight of the body if the weight becomes \( \frac{1}{16} \) at a certain height? Also, consider the radius of the Earth to be \( R \).
A body of mass \( m \) moving with a constant velocity \( v \) hits another body of the same mass moving with the same velocity \( v \) but in the opposite direction and sticks to it. The velocity of the compound body after the collision is
The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is –
Plane angle and solid angle have –
Which is a constant for a freely falling object?
The frame of reference attached to a satellite of the earth is
What is the need for laminating the core of a transformer?
Number of significant figures in 42306, 0.0007 and \(6.5 \times 10^{-3}\) are respectively.
The angle between centripetal acceleration and tangential acceleration is.