List of top Physics Questions asked in COMEDK UGET

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:
Though Sn and Si are 4th group elements, Sn is a metal while Si is a semiconductor because
A one kg block of ice at $ -1.5^\circ C $ falls from a height of 1.5 km and is found melting. The amount of ice melted due to fall, if 60% energy is converted into heat is (Specific heat capacity of ice is 0.5 cal g$^{-1}$ C$^{-1}$, Latent heat of fusion of ice = 80 cal g$^{-1}$)
The closest approach of an alpha particle when it makes a head-on collision with a gold nucleus is $ 10 \times 10^{-14} $ m. Then the kinetic energy of the alpha particle is:

If potential (in volt) in a region is expressed as $ V(x, y, z) = 6xy - y + 2yz $, the electric field (in} $ \text{N/C} $ at point (1, 0, 1) is:

Which of the given dimensional formula represents heat capacity?
A circular coil of radius 0.1 m is placed in the X-Y plane and a current 2 A is passed through the coil in the clockwise direction when looking from above. Find the magnetic dipole moment of the current loop.
A cubical box of side 1 m contains Boron gas at a pressure of 100 Nm$^{-2}$. During an observation time of 1 second, an atom travelling with the rms speed parallel to one of the edges of the cube, was found to make 500 hits with a particular wall, without any collision with other atoms. The total mass of gas in the box in gram is:
A string of length 25 cm and mass $ 10^{-3} $ kg is clamped at its ends. The tension in the string is 2.5 N. The identical wave pulses are generated at one end and at regular interval of time, $ \Delta t $. The minimum value of $ \Delta t $, so that a constructive interference takes place between successive pulses is:
On increasing the temperature of a conductor, its resistance increases because
When light wave passes from a medium of refractive index $ \mu $ to another medium of refractive index $ 2\mu $, the phase change occurs to the light is:
Which of the following statement is true regarding the centre of mass of a system?
An ideal diode is connected in series with a capacitor. The free ends of the capacitor and the diode are connected across a 220 V ac source. Now the potential difference across the capacitor is:
A coil offers a resistance of 20 ohms for a direct current. If we send an alternating current through the same coil, the resistance offered by the coil to the alternating current will be:
The current through a conductor is $ a $ when the temperature is 0°C. It is $ b $ when the temperature is 100°C. The current through the conductor at 220°C is:

Which of the following graph shows the variation of velocity with mass for the constant momentum?

The mass of a particle A is double that of particle B and the kinetic energy of B is $ \frac{1}{8} $ that of A. Then the ratio of the de-Broglie wavelength of A to that of B is:

Current flows through uniform, square frames as shown in the figure. In which case is the magnetic field at the centre of the frame not zero?

Steel is preferred to soft iron for making permanent magnets because,
A metal ball of mass m is projected at an angle $\theta$ with the horizontal with an initial velocity $ u $. If the mass and angle of projection are doubled keeping the initial velocity the same, the ratio of the maximum height attained in the former to the latter case is: