COMEDK 2024 Afternoon Shift

An ideal gas changes its state from \(\mathrm{A}\) to \(\mathrm{C}\) in two different paths \(\mathrm{ABC}\) and \(\mathrm{AC}\). The internal energy of the gas at state \(\mathrm{C}\) is \(20 \mathrm{~J}\) and at state \(\mathrm{B}\) is $$...

A man standing in a truck moving with constant velocity throws a ball vertically into air, ball falls

A cube bar slides thrice the time with friction than that without friction when it slides on an inclined plane of inclination \(45^{\circ}\). The coefficient of friction between the block and the surface is

The magnetic susceptibility of an ideal diamagnetic substance is

The percentage increase in magnetic field \(\mathrm{B}\) when the space within a current carrying solenoid is filled with a medium of susceptibility 0.004 is

Two balls are thrown horizontally, one from the window of first floor which is \(3 \mathrm{~m}\) high from the ground and second from the second floor which is \(6 \mathrm{~m}\) high from the ground, of a multi storey building, with the sam...

The graph of an object moving with speed v for a time t is shown below.

The graph that shows the distance s travelled by the same object for a time t is

A long horizontal wire \(\mathrm{P}\) carries current of \(50 \mathrm{~A}\) from left to right. It is rigidly fixed. Another fine wire \(\mathrm{Q}\) is placed directly above and parallel to \(\mathrm{P}\). The mass of the wire is '$$\mathr...

A charge of \(+1 \mathrm{C}\) is moving with velocity \(\vec{V}=(2 \mathrm{i}+2 \mathrm{j}-\mathrm{k}) \mathrm{ms}^{-1}\) through a region in which electric field \(\vec{E}=(\mathrm{i}+\mathrm{j}-3 \mathrm{k}) \quad \mathrm{NC}^{-1}\) and m...

To increase the current sensitivity of a moving coil galvanometer by \(25 \%\), its resistance is increased so that the new resistance becomes twice its initial resistance. By what factor does the voltage sensitivity change?

An object is placed at a distance of \(12 \mathrm{~cm}\) from a convex lens on its principal axis and a virtual image of certain size is formed. If the object is moved \(4 \mathrm{~cm}\) away from the lens, a real image of the same size as ...

Light enters at an angle of incidence in a transparent rod of refractive index '\(n\)'. The least value of '\(n\)' for which the light once entered into it will not leave it through its lateral face whatsoever be the value of the angle of i...

In a container of height \(21 \mathrm{~cm}\), certain transparent liquid is taken to a height of \(12 \mathrm{~cm}\). When seen from above, it appears half filled. The refractive index of the liquid is

To a fish under water, viewing obliquely, a fisherman standing on the bank of a lake looks

A record player is spinning at an angular velocity of \(45 \mathrm{~rpm}\) just before it is turned off. It then decelerates at a constant rate of \(0.8 \mathrm{~rad} \mathrm{~s}^{-1}\). The angular displacement is

An object of mass \(1 \mathrm{~kg}\) is allowed to hang tangentially from the rim of the wheel of radius R. When released from the rest, the block falls vertically through \(4 \mathrm{~m}\) height in 2 seconds. The moment of inertia is $$1 ...

The mobility of the charge carriers increases with

In intrinsic semiconductors at room temperature, number of electrons and holes are

A semiconductor \(\mathrm{X}\) is made by doping silicon with phosphorous. A second semiconductor \(\mathrm{Y}\) is made by doping silicon with aluminium. The two are joined by a suitable technique to form a \(\mathrm{p}\)-\(\mathrm{n}\) ju...

\(\text { In a p-n junction, the depletion layer of thickness } 1 \mu \mathrm{m} \text { has } 0.05 \mathrm{~V} \text { potential across it. The electric field in } N C^{-1} \text { is }\)

A circular disc of mass \(20 \mathrm{~kg}\), having radius \(10 \mathrm{~cm}\) is suspended by a wire attached to its centre. The wire is twisted by rotating the disc and released. The time period of torsional oscillations is found to be $$...

If units of mass, length and gravitational constant are chosen to fundamental units, the dimensions of time would be

If \(\alpha, \beta\) and \(\gamma\) are the angles between the vectors \(\overrightarrow{\mathrm{P}}, \overrightarrow{\mathrm{Q}}\), and \(\overrightarrow{\mathrm{R}}\) and \(\alpha=90^{\circ}\) as shown in figure. the product of $$(\vec{Q}...

In Young's double slit experiment the ratio of phase difference between light waves reaching the third bright fringe and third dark fringe is

A slit of width \(10 \times 10^{-7} \mathrm{~m}\) is illuminated by light of wavelength \(500 \mathrm{~nm}\). Angular position of the first minimum is

In Young's double slit experiment, the intensity of light at a point on the screen where the path difference is \(\lambda\) is \(\mathrm{K}\) units (\(\lambda\) is the wavelength of light used). The percentage change in intensity at a point...

In Young's double slit experiment, the ratio of intensities of light from one slit to the other is \(9: 1\). If Im is the maximum intensity, what is the resultant intensity when they interfere at phase difference \(\phi\) ?

A tuning fork of unknown frequency produces 4 beats with tuning fork of frequency \(310 \mathrm{~Hz}\). It gives the same number of beats on filing. The initial frequency of a tuning fork is

An object of mass \(3 \mathrm{~kg}\) moves due to an applied constant force such that its position along \(\mathrm{X}\) axis is given by \(x=\frac{t^3}{3}\) where \(x\) is in meters and $t$ in seconds. The work done in 1 second is

An electric motor raises a mass of \(1.5 \mathrm{~kg}\), a distance of \(1.128 \mathrm{~m}\) in time of \(4.79 \mathrm{~s}\). Calculate the power to an appropriate significant figures.
(take \(g=9.81 \mathrm{~ms}^{-2}\))