List of practice Questions

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
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
Distance between two point charges is increased by 20%. Force of interaction between the charges
A star is moving away from the Earth with speed $V$. Change in wavelength $(d\lambda)$ observed on Earth is
An example of a sulphur containing amino acid is
Power factor of a series $LCR $ circuit is
Proton and $\alpha$ particle have the same deBroglie wavelength. Which one is the same for both of them ?
The argument of the complex number $\sin\left(\frac{6\pi}{5}\right) + i\left(1 +\cos \frac{6\pi}{5}\right) $ is
The metal hydroxide which is soluble in excess of ammonium hydroxide is
When phenol is treated with chloromethane in presence of $AlCl_3$ we get
90 dB sound is x times more intense than 40 dB sound, then x is
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
Pure water is neutral because
The ebullioscopic constant is the elevation in boiling point produced by
Which one of the following pairs of animals comprises 'jawless fishes'?
Which one of the following order is correct for the first ionisation energies of the elements ?
0.5 g of an acid is neutralized by 40 cc of 0.125 N NaOH. The equivalent mass of the acid is
In the Molisch reagent, the substance used is
$2p_x$ atomic orbital undergoes linear combination with
The adsorption of an inert gas on activated charcoal increases with
If $A= \begin{bmatrix}1&2\\ 0&1\end{bmatrix} $, then $A^n$ is
The number of distinct real roots of $\begin{vmatrix}\sin x&\cos x&\cos x\\ \cos x&\sin x&\cos x\\ \cos x &\cos x&\sin x\end{vmatrix}$ in the interval $ \left[\frac{-\pi}{4}, \frac{\pi}{4}\right] $ is
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} = $
$\displaystyle\lim_{n\to\infty} \frac{\left(1^{2} +2^{2} + ....+n^{2}\right) \sqrt[n]{n}}{ \left(n+1\right)\left(n+10\right)\left(n+100\right)} = $