List of top Questions asked in COMEDK UGET- 2007

The ratio of forces between two point charges in the two cases when their separation is halved and when it is doubled, is
To increase the angular width of interference fringes
A charge $Q$ is to be divided into two parts, $q$ and $(Q- q)$, such that force between them is maximum. Then
In Young's double slit experiment, intensity at a bright fringe is $I_0$. One of the slits is closed. Intensity at the same position is
In an interference experiment, when a glass plate of refractive index 1.5 is introduced in the path of one of the beams; fringes are displaced by $x$. When the glass plate is replaced by another transparent plate of same thickness, shift in the fringe is $ \frac{3}{2} x .$ Refractive index of $2^{nd}$ transparent plate is
An object radiates at temperature $127^{\circ} C$. Temperature. at which radiates 16 times more is
$A, B$ and $C$ are three voltmeters of resistances $4000 \, \Omega , 6000 \Omega$ and $12000 \Omega$. When a potential difference? is applied between $X$ and $Y$, voltmeter readings are $V_A, V_B$ and $V_C$. Then
A particular solution of $ \frac{dy}{dx} = (x+9y)^2$ when $ x = 0, y = \frac{1}{27}$ is
A train moving with a speed of 36 kmph takes 14 s to cross a bridge of length 100 m. The length of the train is
Escape velocity from Earth is about 11 km/s. The escape velocity from a planet, 4 times the size of the Earth with same mean density is
Force per unit length between long parallel wires in the circuit is $3.6 \times 10^{-3} \, N \, m^{-1}$. Resistance of the circuit is
The angle between the asymptotes of the hyperbola $x^2 - 3y^2 = 12$ is
The amplitude of $\sin \frac{\pi}{5} + i\left( 1 - \cos \frac{\pi}{5}\right) $
Decarboxylation of an acid can be carried out using
In a galvanic cell, the reaction that occurs at the cathode is
The solution having lowest freezing point is
Which one of the following is least electropositive element?
Coordination number of nickel in$[Ni(C_2O_4)_3]^{4-}$ is
Two points separated by a distance of 0.1 mm can just be observed using a microscope when light $\lambda = 600\: nm$ is used. If light of wavelength 480 nm is used, this limit of resolution becomes
The maximum value of $ f(x) = \frac{\log x}{x} , 0 < x < \infty$ is
The speed of electromagnetic radiation in vacuum
The kinetic energy of the photoelectrons increases by $0.52 \, eV$ when the wavelength of incident light is changed from $500 \, nm$ to another wavelength which is approximately
The capacitance of the Earth considered as a conducting sphere of radius $6408 \, km$ is
Cuprous ion is
Geometrical isomerism is exhibited by