List of top Questions asked in COMEDK UGET- 2009

If $\alpha , \beta , \gamma$ are the roots of the equation $x^3 + px + q = 0$, then the value of the determinant $\begin{vmatrix}\alpha&\beta&\gamma\\ \beta&\gamma&\alpha\\ \gamma&\alpha&\beta\end{vmatrix} = $
$\cos^2 \frac{\pi}{12} + \cos^2 \frac{\pi}{4} \cos^2 \frac{5 \pi}{12} = $
Horn silver is
Tetrahedral structure is formed by
The standard temperature used in thermo- chemical calculations is
$2p_x$ atomic orbital undergoes linear combination with
To dry ammonia gas the drying agent used is
50 cc of oxalic acid is oxidized by 25 cc of 0.20 $ { N \, KMnO_4}$. The mass of oxalic acid present in 500 cc of the solution is
50% of a first order reaction is completed in 30 min. The velocity constant of the reaction is
0.5 g of an acid is neutralized by 40 cc of 0.125 N NaOH. The equivalent mass of the acid is
Which of the following is an intensive property?
A reaction is spontaneous at all temperatures when
The adsorption of an inert gas on activated charcoal increases with
When the same amount of electricity is passed through solutions of silver nitrate and copper sulphate, 0.4 g copper is deposited. The amount of silver deposited is
With the addition of impurities surface tension of a liquid
Viscosity decreases with increase in temperature is the reason for (i) hot water moving faster than cold water (ii) more viscous oils are used in motor cars during summer than in winter
A star is moving away from the Earth with speed $V$. Change in wavelength $(d\lambda)$ observed on Earth is
$_6C^{14}$ and $7_N^{15}$ are examples of
If the Earth shrinks in its size (radius) mass remaining the same, the value of g on its surface will
Distance between two point charges is increased by 20%. Force of interaction between the charges
A $CE$ amplifier has current gain 50. Load resistance is $4 \, k\Omega$ and input resistance is $500 \, \Omega . 10 \, m V \, AC$ signal is applied. Peak value of output signal is
A calcite crystal is placed over a dot on a paper sheet and the crystal is rotated. On viewing through the calcite one sees
90 dB sound is x times more intense than 40 dB sound, then x is
The square of the resultant of two equal forces acting at a point is equal to three times their product. Angle between them is
Two rods of same area of cross section and lengths, and conductivities $K_1$ and $K_2$ are connected in series. Then, in steady state conductivity of the combination is