COMEDK 2024 Evening Shift

The coefficient of volume expansion of glycerine is \(49 \times 10^{-5} \mathrm{~K}^{-1}\). The percentage change in its density for a \(50^{\circ} \mathrm{C}\) rise in temperature is

The latent heat of vaporisation of water is \(2240 \mathrm{~J}\). If the work done in the process of vaporisation of \(1 \mathrm{~g}\) is \(168 \mathrm{~J}\), the increase in internal energy is

Internal energy of \(\mathrm{n}_1\) moles of hydrogen at temperature T is equal to internal energy of \(\mathrm{m}_2\) moles of helium at temperature 2T. The ratio \(\frac{n_1}{n_2}\) is

A cylinder of fixed capacity 44.81 contains hydrogen gas at STP. What is the amount of heat needed to raise the temperature of the gas in the cylinder by \(20^{\circ} \mathrm{C}\) ? ($$R=8.31 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$...

Action and reaction can never balance out because

A body initially at rest undergoes rectilinear motion. The forcetime (F-t) graph for the motion of the body is given below. Find the linear momentum gained by the body in \(2 \mathrm{~s}\).

For a paramagnetic material, the dependence of the magnetic susceptibility \(\chi\) on the absolute temperature is given as

A bar magnet is held perpendicular to a uniform field. If the couple acting on the magnet is to be halved, by rotating it, the angle by which it is to be rotated is

A cricketer of height \(2.5 \mathrm{~m}\) throws a ball at an angle of \(30^{\circ}\) with the horizontal such that it is received by another cricketer of same height standing at a distance of \(50 \mathrm{~m}\) from the first one. The maxi...

A wire of length \(2 \mathrm{~m}\) carries a current of \(1 \mathrm{~A}\) along the \(\mathrm{x}\) axis. A magnetic field \(B=B_0(i+j+k)\) tesla exists in space.
The magnitude of magnetic force on the wire is

A current I flows in an infinitely long wire with cross section in the form of semi-circular ring of radius \(1 \mathrm{~m}\). The magnitude of the magnetic induction along its axis is

A negative charge particle is moving upward in a magnetic field which is towards north. The particle is deflected towards

When a biconvex lens of glass of refractive index 1.5 is dipped in a liquid, it acts like a plane sheet of paper.
This means the refractive index of the liquid is

A hollow prism is filled with water and placed in air. It will deviate the incident rays

A telescope has an objective of focal length \(60 \mathrm{~cm}\) and eyepiece of focal length \(5 \mathrm{~cm}\). The telescope is focussed for least distance of distinct vision \(300 \mathrm{~cm}\) away from the object. The magnification p...

Figure below shows a lens of refractive index, \(\mu=1.4\). \(C_1\) and \(C_2\) are the centres of curvature of the two faces of the lens of radii of curvature \(4 \mathrm{~cm}\) and \(8 \mathrm{~cm}\) respectively.

The lens behaves as a

Joule second is the unit of

A solid cylinder of mass \(2 \mathrm{~kg}\) and radius \(0.2 \mathrm{~m}\) is rotating about its own axis without friction with angular velocity \(5 \mathrm{~rad} \mathrm{s}^{-1}\). A particle of mass \(1 \mathrm{~kg}\) moving with a veloci...

The conductivity of a semiconductor increases with increase in temperature because
A) number density of free current carriers increases
B) relaxation time increases
C) both number density of carriers and relaxation time increase
D) number d...

The output of the given circuit is
A. Negatively rectified half wave
B. Positively rectified half wave
C. Negatively rectified full wave
D. Zero all times

The following are the graphs of potential barrier versus width of the depletion region for a p-n junction diode.

Which of the following is correct?

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A body is executing SHM. When its displacements from the mean position are \(4 \mathrm{~cm}\) and \(5 \mathrm{~cm}\) it has velocity \(10 \mathrm{~cms}^{-1}\) and \(8 \mathrm{~cms}^{-1}\) respectively. Its periodic time \(\mathrm{t}\) is

The dimension \([\mathrm{ML}^{-1} \mathrm{~T}^{-2}]\) is the physical quantity of

In Young's double slit experiment light of wavelength \(500 \mathrm{~nm}\) is used to form interference pattern. A uniform glass plate of refractive index 1.5 and thickness \(0.1 \mathrm{~mm}\) is introduced in the path of one of the interf...

Two narrow parallel slits illuminated by a coherent monochromatic light produces an interference pattern on a screen
placed at a distance \(\mathrm{D}\) from the slits. The separation between the dark lines of the interference pattern can b...

Incident light of wavelength \(\lambda=800 \mathrm{~nm}\) produces a diffraction pattern on a screen \(1.5 \mathrm{~m}\) away when it passes through a single slit of width \(0.5 \mathrm{~mm}\). The distance between the first dark fringes on...

A monochromatic light of wavelength \(800 \mathrm{~nm}\) is incident normally on a single slit of width \(0.020 \mathrm{~mm}\) to produce a diffraction pattern on a screen placed \(1 \mathrm{~m}\) away. Estimate the number of fringes obtain...

The number of possible natural oscillations of air column in a pipe closed at one end of length \(85 \mathrm{~cm}\) whose frequencies lie below \(1250 \mathrm{~Hz}\) are (velocity of sound \(=340 \mathrm{~ms}^{-1}\))

A scooter moves with a speed of \(7 \mathrm{~ms}^{-1}\), on a straight road and is stopped by applying the brakes. Before stopping, the scooter travels \(10 \mathrm{~m}\). If the weight of the scooter is \(\mathrm{W}\), then the total resis...

When water falls from a height of \(80 \mathrm{~m}\) at the rate of \(20 \mathrm{~kg} \mathrm{~s}^{-1}\) to operate a turbine the losses due to frictional force are \(20 \%\) of input energy. How much power is generated by the turbine?