COMEDK 2022

The escape velocity of a projectile on the earth's surface is 11.2 km/s. A body is projected out with thrice this speed. The speed of the body far away from the earth will be

If heat engine is filled at temperature 27\(^\circ\)C and heat of 100 k cal is taken from source at temperature 677\(^\circ\)C. Work done (in J) is

From the following p-V diagram, an ideal gas undergoing a change of state from A to B. Four different processes I, II, III and IV as shown in the figure may lead to same change of state.

An ideal gas is taken through the cycle A \(\to\) B \(\to\) C \(\to\) A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process
C \(\to\) A is,

The average kinetic energy of a molecule in air at room temperature of 20\(^\circ\)C

There are two identical containers C\(_1\) and C\(_2\) containing to identical gases. Gas in C\(_1\) is reduced to half of its original volume adiabatically, while the gas in container C\(_2\) is also reduced to half of its initial volume i...

In which mode of transmission, the heat waves travel along straight line with the speed of light?

Consider a compound slab consisting of two different materials having equal lengths, thickness and thermal conductivities K and 2K respectively. The equivalent thermal conductivity of the slab is

With what minimum acceleration can a fireman slide down a rope while breaking strength of the rope is \(\frac{2}{3}\) of the weight?

A bar magnet of length \(6 \mathrm{~cm}\), is placed in the magnetic meridian with \(N\) pole, pointing towards the geographical north. Two neutral points, separated by a distance of \(8 \mathrm{~cm}\) are obtained on the equitorial axis of...

The displacement \(x\) of a particle in a straight line motion is given by \(x=1-t-t^2\). The correct representation of the motion is

Two guns P and Q can fire bullets at speeds 2 km/s and 4 km/s, respectively. From a point on a horizontal ground, they are fired in all possible directions. The ratio of maximum or areas covered by the bullets fired by the two guns, on the ...

A car is moving with a speed of 54 km/h. If after 3 s, the driver applies brakes and it stops, then how much distance is covered by the car before coming to rest?

An electric current $I$ enters and leaves a uniform circular wire of radius $r$ through diametrically opposite points. A charged particle \(q\) moves along the axis of circular wire passes through its centre with speed \(v\). The magnetic f...

A regular hexagon of side \(m\) which is a wire of length 24 m is coiled on that hexagon. If current in hexagon is \(I\), then the magnetic moment,

A point object is placed on the optic axis of a convex lens of focal length \(f\) at a distance of \(2f\) to the left of it. The diameter of the lens is \(d\). An eye is placed at a distance of \(3f\) to the right of the lens and a distance...

A plane glass mirror of thickness 3 cm of material of \(\mu=\frac{3}{2}\) is silvered on the black surface. When a point object is placed 9 cm from the front surface of the mirror, then the position of the brightest image from the front sur...

A disc of moment of inertia 4 kg - m\(^2\) revolving with 16 rad/s is placed on another disc of moment of inertia 8 kg - m\(^2\) revolving 4 rad/s. The angular frequency of composite disc

For CE transistor amplifier, the audio signal voltage across the collector resistance of 4 k\(\Omega\) is 5 V. If the current amplification factor of the transistor is 100 and base resistance is 2 k\(\Omega\), then input signal voltage is

Which of the following gate give the similar output as the output of circuit diagram shown in the figure?

Choose the incorrect statements.

A particle is performing simple harmonic motion. Equation of its motion is \(x = 5\sin \left( {4t - {\pi \over 6}} \right),x\) being the displacement from mean position. Velocity (in ms\(^{-1}\)) of the particle at the instant when its dis...

The resultant of two forces acting at an angle of 120\(^\circ\) is 10 kg-W and is perpendicular to one of the forces. That force is

In Young's double slit experiment, the two slits are separated by 0.2 mm and they are 1 m from the screen. The wavelength of the light used is 500 nm. The distance between 6th maxima and 10th minima on the screen is closest to

In Young's double slit experiment, the fringe width is found to be 0.4 mm. If the whole apparatus is immersed in a liquid of refractive index \(\frac{4}{3}\) without changing geometrical arrangement, the new fringe width will be

A bat emitting an ultrasonic wave of frequency 4.5 \(\times\) 104 Hz at speed of 6 m/s between two parallel walls. The two frequencies heard by the bat will be

A source of sound emits sound waves at frequency \(f_0\). It is moving towards an observer with fixed speed \({v_s}\) (\({v_s},v\), where \(v\) is the speed of sound in air.) If the observers were to move towards the source with speed $$v_0...

The string of length 2 m is fixed at both ends. If the string vibrates in its fourth normal mode with a frequency of 500 Hz, then the waves would travel on it with a velocity of

If kinetic energy of a body is increased by 300%, then percentage change in momentum will be

A particle of mass \(m\) is moving in a horizontal circle of radius \(r\) under a centripetal force given by \(\left(\frac{-K}{r^2}\right)\), where \(K\) is a constant. Then