List of top Questions asked in JEE Main, KCET

Identify the gas which is readily adsorbed by activated charcoal

In the manufacture of ammonia by the Haber's process, ${N_{2(g)} +3H_{2(g)} <=> 2NH_{3(g)} + 92.3 kJ} $, which of the following conditions is unfavourable ?

SI unit of permittivity is ...........

Two equal forces ($P$ each) act at a point inclined to each other at an angle of $120^\circ$. The magnitude of their resultant is _____

An uncharged sphere of metal is placed inside a charged parallel plate capacitor. The lines of force will look like .........

In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to :

Aluminium displaces hydrogen from dilute HCl whereas silver does not. The E.M.F. of a cell prepared by combining $Al /Al^{+3}$ and $Ag/Ag^{+}$ is $2.46\, V.$ The reduction potential of silver electrode is $+ 0.80\, V$. The reduction potential of aluminium electrode is :

Motor cells are found in______

H - polaroid is prepared by _____

A thread is tied slightly loose to a wire frame as in figure and the frame is dipped into a soap solution and taken out. The frame is completely covered with the film. When the portion $A$ is punctured with a pin, the thread ..........

The loudness and pitch of a sound note depends on .........

A beam of light of wavelength $600\, nm$ from a distant source falls on a single slit $1\, mm$ wide and the resulting diffraction pattern is observed on a screen $2\, m$ away. The distance between the first dark fringes on either side of the central bright fringe is

When $50\, cm ^{3}$ of $0.2\, N$ $H_{2} SO _{4}$ is mixed with $50 cm ^{3}$ of $1 N\, KOH$, the heat liberated is :

The refractive index of a particular material is $1.67$ for blue light, $1.65$ for yellow light and $1.63$ for red light. The dispersive power of the material is .........

Stainless steel does not rust because :

A man, standing between two cliffs, claps his hands and starts hearing a series of echoes at intervals of one second. If the speed of sound in air is $340 \,ms ^{-1}$, the distance between the cliffs is ..........

Curie-Weiss law is obeyed by iron at a temperature ...........

The Law of Limiting Factors was proposed by ______

When light is incident on a diffraction grating the zero order principal maximum will be _____

Rainbow is formed due to.............

The set of all integral multiples of $5$ is a subgroup of

Select the $pK_a$ value of the strongest acid from the following :

When a body is earth connected, electrons from the earth flow into the body. This means the body is .............

The emitter-base junction of a transistor is ............. biased while the collector-base junction is ............. biased.

The coal tar fraction which contains phenol is :