List of top Questions asked in COMEDK UGET

A bar magnet is oscillating in the earth’s magnetic field with a period \( T \). What happens to its period and motion, if its mass is quadrupled?
Which of the following statement is incorrect?
The magnifying power of a telescope is 9. When adjusted for parallel rays, the distance between the objective and eyepiece is 20 cm. The focal lengths of lenses are:
Ba-122 has half-life of 2 min. Experiment has to be done using Ba-122 and it takes 10 min to set up the experiment. It initially had 80 g of Ba-122. How much Ba-122 was left when the experiment started?
Two masses of 1g and 9g are moving with equal kinetic energy. The ratio of magnitude of their momentum is
What should be the value of self-inductance of an inductor that should be connected to 220 V, 50 Hz supply, so that a maximum current of 0.9 A flows through it?
When two bodies collide with each other such that their kinetic energy remains constant, their collision is said to be
In a detector, the output circuit consists of \( R = 10 \, \text{k}\Omega \) and \( C = 100 \, \text{pF} \). The frequency of carrier signal it can detect is:
When the speed of light becomes \( \frac{2}{3} \) of its present value, then the energy released in a given atomic explosion would
According to Pascal’s law, pressure in a fluid at rest is the same at all points, if
The surface tension of a liquid at its boiling point
The motion of a particle of mass \( m \) is described by \( y = ut + g t^2 \). The force acting on the particle will be
When a car of mass \( m \) is moving with speed \( v \) along a circle of radius \( r \) on a level road, the centripetal force is provided by \( f \), where \( f \) denotes
Newton’s second law of rotational motion of a system of particles having angular momentum \( L \) is given by
A wire is stretched to double of its length. The strain is
A long solenoid has 20 turns cm\(^{-1}\). The current necessary to produce a magnetic field of 20 mT inside the solenoid is approximately
If an electron in hydrogen atom jumps from an orbit of level \( n = 3 \) to an orbit at level \( n = 2 \), emitted radiation has a frequency of
\( (R = \text{Rydberg’s constant}, \ c = \text{speed of light}) \)
A constant potential energy of a satellite is given as \[ PE = r \cdot KE \] where PE = potential energy and KE = kinetic energy. The value of \( r \) will be
Within the elastic limit, the corresponding stress is known as
Kepler’s second law of planetary motion corresponds to
An unpolarised beam of intensity \( I_0 \) is incident on a pair of nicols making an angle of \( 60^\circ \) with each other. The intensity of light emerging from the pair is
The average energy associated with a monoatomic molecule is
The resistance of a wire is \( R \) ohm. If it is melted and stretched to \( n \) times its original length, its new resistance will be
The collision of the molecules of an ideal gas is taken as
What is the electric field near an infinite plane sheet of charge density \( \sigma \)?