List of top Questions asked in COMEDK UGET

\( \sum_{n=1}^{m} n \cdot n! \) is equal to
A 30 mW laser beam has a cross-sectional area of 15 mm\(^2\). The magnitude of the maximum electric field in this electromagnetic wave is given by: \[ \text{Permittivity of space, } \varepsilon_0 = 9 \times 10^{-12}, \quad \text{Speed of light, } c = 3 \times 10^8 \text{ m/s} \]
A particle is performing simple harmonic motion. Equation of its motion is \( x = 5 \sin \left( 4t - \frac{\pi}{6} \right) \), \( x \) being the displacement from the mean position. Velocity (in ms\(^{-1}\)) of the particle at the instant when its displacement is 3, will be
Barbiturates are used to treat
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
O\(_2^{−}\), F\(^−\), Mg\(^{2+}\), Al\(^{3+}\), O\(_2\), F\(_2\). How many of the species given above are isoelectronic?
In which mode of transmission, the heat waves travel along straight line with the speed of light?
A circular coil of 20 turns and radius 10 cm is placed in a uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in the coil is 5 A, then the average force on each electron in the coil due to the magnetic field is
Calculate the molar conductance of 0.025M aqueous solution of calcium chloride at 25°C. The specific conductance of calcium chloride is \( 12.04 \times 10^{-2} \, \text{S} \, \text{m}^{-1} \)
There are 12 points in a plane out of which 3 points are collinear. How many straight lines can be drawn by joining any two of them?
Charge on electron is
If \(K_1\) and \(K_2\) are maximum kinetic energies of photoelectrons emitted when lights of wavelengths \(\lambda_1\) and \(\lambda_2\), respectively incident on a metallic surface and \(\lambda_1 = 3\lambda_2\), then
Choose the incorrect statements.
The solution of the differential equation \( \frac{dy}{dx} + \sqrt{\frac{1 - y^2}{1 - x^2}} = 0 \) is
A raft of density 600 g/m\(^3\) and mass 120 kg floats in water. How much weight can be put on the raft to make it just sink?
Increasing order of bond order of oxygen and its ions is
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
A regular polygon of \( n \) sides has 170 diagonals. Then \( n \) is equal to:
Speed of electromagnetic wave in a medium having relative permittivity \( \epsilon_r \) and relative permeability \( \mu_r \) is (speed of light in air, \( c = 3 \times 10^8 \, \text{m/s} \))
The height at which the acceleration due to gravity becomes \( \frac{g}{16} \) (where \( g \) is the acceleration due to gravity on the surface of the earth) in terms of \( R \), if \( R \) is the radius of the Earth.
The first and fifth terms of an A.P. are -14 and 2 respectively and the sum of its $n$ terms is 40. The value of $n$ is
The spectrum of He\(^+\) is similar to
If \( \sin A + \sin B = a \) and \( \cos A + \cos B = b \), then \( \cos(A + B) \) equals?
In Young's double slit experiment, the two slits are separated by 0.2 mm and they are 1m 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
The relation between work done in reversible and irreversible process is