List of practice Questions

When the cold and hot junctions of a thermocouple are interchanged, the thermo emf
The one which decreases with dilution is
The ore that is concentrated by Froth Floatation process is
The characteristic not related to alkali metal is
A covalent molecule $AB_3$ has pyramidal structure. The number of lone pair and bond pair electrons in the molecule are respectively
In electrophillic aromatic substitution reaction, the nitro group is meta directing because it
If $'n '$ is a positive integer, then $n^3 + 2n$ is divisible by
On the set of integers $Z$. define $f: Z \to Z$ as $ f(n) = \begin{cases} n/2 & \quad \text{if } n \text{ is even}\\ 0 & \quad \text{if } n \text{ is odd}\\ \end{cases} $ then $'f'$ is
$\cos^2 \frac{\pi}{12} + \cos^2 \frac{\pi}{4} \cos^2 \frac{5 \pi}{12} = $
$_6C^{14}$ and $7_N^{15}$ are examples of
A stone dropped from the top of a tower reaches ground in 4 s. Height of the tower is $(g = 10 \, m/s^2)$
In the group $\{1, 2, 3, 4, 5, 6\}$ under multiplication mod $7, 2^{-1} \times 4 =$
If only 2% of the main current is to be passed through a galvanometer of resistance G, the resistance of shunt should be
In the detection of III group basic radicals, $ {NH4OH}$ is added after $ {NH_4Cl}$ to
In the titration of Mohr's salt against $ {KMnO_4}$ the indicator used is
Lysine is
The value of $\int \frac{10^{x/2}}{\sqrt{10^{-x} - 10^{x}}}dx$ is
With the addition of impurities surface tension of a liquid
The square of the resultant of two equal forces acting at a point is equal to three times their product. Angle between them 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
Electrolysis of brine gives a mixture of
$n $ type and $p$ type semiconductors can be obtained by doping pure silicon respectively with
Potential energy of two charges $10 \, nC$ each separated by a distance of 0.09 m in air is
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
The standard temperature used in thermo- chemical calculations is