List of practice Questions

In an $n-p-n$ transistor, $p$ is

Nylon is a

Among second period elements/the correct order for first ionisation enthalpy is

$H A$ is a weak acid. At $25^{\circ} C$, the molar conductivity of $0.02\, M\, H A$ is $150\, \Omega^{-1} cm ^{2} mol ^{-1}$. If its $\Lambda_{ m }^{ o }$ is $300\, \Omega^{-1} cm ^{2} mol ^{-1}$, then equilibrium constant of $H A$ dissociation is

The number of integer value(s) of $k$ for which the expression $ {{x}^{2}}-2(4k-1)x+15{{k}^{2}} $ $ -2k-7>0 $ for every real number $x$ is/are

$K_{p} / K_{c}$ for the reaction $A(g)+2 B_{2}(g) \rightleftharpoons A B_{2}(g)$ is

A satellite revolves around the earth of radius $R$ in a circular orbit of radius $3R.$ The percentage increase in energy required to lift it to an orbit of radius $5R$ is

n-hexane on heating to $773 \,K$ at $10-20$ atmospheric pressure in the presence of oxides of vanadium supported over alumina, yields

Which of the following is incorrect about sky waves?

Which of the following is correct statement about the magnitude of the acceleration $a$ of the particle executing simple harmonic motion?

A gas at high temperature is cooled. The highest temperature at which liquefaction of gas first occurs is called

Two capillary tubes A and B of diameter $1\, mm$ and $2\, mm$ respectively are dipped vertically in a liquid. If the capillary rise in A is 6 cm, then the capillary rise in B is

The compound formed upon combustion of potassium metal in excess air is

Let $A$ and $B$ be points $ (8,\,\,10) $ and $ (18,\,20), $ respectively. If the point $Q$ divides AB externally in the ratio $ 2:3 $ and $M$ is the $S$ mid-point of $AB$, then the length $MQ $ is equal to

If the plane $ 2x-3y+6z-11=0 $ makes an angle $ \theta $ with the $x-axis$, then the value of $ \tan \theta $ is equal to

The number of tetrahedral and octahedral void per unit cell of cubic closed packed structure is

Assuming density $d$ of a planet to be uniform, we can say that the time period of its artificial satellite is proportional to

In an acidified aqueous solution of $Mn ^{2+}, Ni ^{2+}, Cu ^{2+}$ and $Hg ^{2+}$ ions, $H _{2} S$ gas was passed. Precipitates are

When the following amide is treated with $Br_{2}/KOH$, it gives

If the image of the point $ (1,\,-2,3) $ in the plane $ 2x+3y-z=7 $ is the point $ (\alpha ,\beta ,\gamma ) $ then $ \alpha +\beta +\gamma $ is equal to

Consider the diagram shown below.

A voltmeter of resistance $ 150 \,\Omega $ . is connected across $A$ and $B$. The potential drop across and $C$ measured by voltmeter is

A ray of light is incident at an angle $i$ on a glass slab of refractive index $\mu$. The angle between reflected and refracted light is $90^{\circ}$. Then, the relationship between $i$ and $\mu$ is

The current $I$ in the circuit shown is

One mole of NaCl contains 6.023 ??10 molecules of sodium chloride. 58.5 g of NaCl also contains 6.023 ??10 molecules of NaCl.

A balloon which always remains spherical is being inflated by pumping in $10$ cubic centimeters of gas per second. Find the rate at which the radius of the balloon is increasing when the radius is $15$ cms.