List of top Questions asked in UPCATET

Cyclotron cannot accelerate
Two sources of light are said to be coherent when both give out light waves of the same
What does the area under acceleration-time graph represent for any given time interval?
For which of the following is magnetic susceptibility negative?
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
Why can't the DC ammeter measure an alternating current?
The electrical resistance of the depletion layer is large because
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?
For a hollow spherical shell, potential \( V \) changes with respect to distance \( r \) from the centre. Which graph from the following represents this?
What does an electric dipole experience when it is kept in a non-uniform electric field?
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?
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?
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 –
The total energy of a rolling ring of mass \( M \), velocity \( V \), and radius \( R \) is -
When the angle of contact between a solid and a liquid is \( 90^\circ \), then
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
Which is a constant for a freely falling object?
The frame of reference attached to a satellite of the earth is
Plane angle and solid angle have –
The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is –