List of top Physics Questions asked in COMEDK UGET

The magnetic flux linked with a coil is given by the equation: $ \phi = 8t^2 + t + 10 $ The e.m.f. induced in the coil in the 3rd second will be

The resistance of a 10 m long wire is 10 $ \Omega $. Its length is increased by 25\% by stretching the wire uniformly. The new resistance is

A satellite is revolving around the earth in a circular orbit with kinetic energy of $1.69 \times 10^{10}$ J. The additional kinetic energy required for just escaping into the outer space is

A solid cylinder of mass 2 kg and radius 0.2 m is rotating about its own axis without friction with angular velocity 5 rad/s. A particle of mass 1 kg moving with a velocity of 5 m/s strikes the cylinder and sticks to it as shown in figure.


The angular velocity of the system after the particle sticks to it will be:

In a given semiconductor, the ratio of the number density of electron to number density of hole is 2 : 1. If $ \frac{1}{7} $th of the total current is due to the hole and the remaining is due to the electrons, the ratio of the drift velocity of holes to the drift velocity of electrons is :

A transformer which steps down 330 V to 33 V is to operate a device having impedance 110 $\Omega$. The current drawn by the primary coil of the transformer is:

In the Young's double slit experiment, the 2nd bright fringe for red light coincides with the 3rd bright fringe for violet light. Then the value of 'n' is: (Given: wavelength of red light = 6300 $\text{Å}$ and wavelength of violet light = 4200 $\text{Å}$)

A coil of inductance 1H and resistance 100Ω is connected to an alternating current source of frequency $ \frac{50}{\pi} $ Hz. What will be the phase difference between the current and voltage?

A glass of hot water cools from 90°C to 70°C in 3 minutes when the temperature of the surroundings is 20°C. What is the time taken by the glass of hot water to cool from 60°C to 40°C if the surrounding temperature remains the same at 20°C?

The resistance of the galvanometer and shunt of an ammeter are 90 ohms and 10 ohms respectively, then the fraction of the main current passing through the galvanometer and the shunt respectively are:

If $ A $ is the areal velocity of a planet of mass $ M $, then its angular momentum is:

A square shaped aluminium coin weighs 0.75 g and its diagonal measures 14 mm. It has equal amounts of positive and negative charges. Suppose those equal charges were concentrated in two charges (+Q and -Q) that are separated by a distance equal to the side of the coin, the dipole moment of the dipole is:

For a $30^\circ$ prism, when a ray of light is incident at an angle $60^\circ$ on one of its faces, the emergent ray passes normal to the other surface. Then the refractive index of the prism is:

An electric bulb of volume 300 cm$^3$ was sealed off during manufacture at a pressure of 1 mm of mercury at 27°C. The number of air molecules contained in the bulb is, (R = 8.31 J mol$^{-1}$ K$^{-1}$ and $N_A = 6.02 \times 10^{23}$)

When two objects are moving along a straight line in the same direction, the distance between them increases by 6 m in one second. If the objects move with their constant speed towards each other, the distance decreases by 8 m in one second. Then the speed of the objects are:

A stone of mass 2 kg is hung from the ceiling of the room using two strings. If the strings make an angle $ 60^\circ $ and $ 30^\circ $ respectively with the horizontal surface of the roof, then the tension on the longer string is:

If the ratio of lengths, radii and Young's Moduli of steel and brass wires in the figure are $ a $, $ b $, and $ c $ respectively, then the corresponding ratio of increase in their lengths would be:

A parallel plate capacitor is filled by a dielectric whose relative permittivity varies with the applied voltage (U) as $ \epsilon = 2U $. A similar capacitor with no dielectric is charged to $ U_0 = 78 \, \text{V} $. It is then connected to the uncharged capacitor with the dielectric. Find the final voltage on the capacitors.

The width of the fringes obtained in the Young's double slit experiment is 2.6 mm when light of wavelength 6000$^\circ$A is used. If the whole apparatus is immersed in a liquid of refractive index 1.3 the new fringe width will be:

Two circular coils of radius 'a' and '2a' are placed coaxially at a distance 'x' and '2x' respectively from the origin along the X-axis. If their planes are parallel to each other and perpendicular to the X-axis and both carry the same current in the same direction, then the ratio of the magnetic field induction at the origin due to the smaller coil to that of the bigger one is: