List of practice Questions

Photons and alpha particles have the same de-Broglie wavelength. What is the same for both of them?
Displacement current is due to -
An Astronomical Unit, or AU, is the average distance between
The isotope generally used for the treatment of cancer is -
In Young's double slit experiment, the central point on the screen is -
Which of the following materials is the most suitable for making a permanent magnet?
Cyclotron cannot accelerate
What does the area under acceleration-time graph represent for any given time interval?
For which of the following is magnetic susceptibility negative?
Two sources of light are said to be coherent when both give out light waves of the same
Why can't the DC ammeter measure an alternating current?
A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is \( B \). It is then bent into a circular coil of \( n \) turns. The magnetic field at the centre of this coil of \( n \) turns will be
The electrical resistance of the depletion layer is large because
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?
A potentiometer is considered a versatile and accurate device to make an electrical measurement of EMF. Why?
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?
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?
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?
Which of the following does not exhibit polarization?
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?
Curie temperature is the temperature above which –
Efficiency of a Carnot heat engine working between the temperatures \(27^\circ \text{C}\) and \(227^\circ \text{C}\) is –
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?
Which of the following is the largest unit of energy?