List of practice Questions

A wire loop is rotated in magnetic field. The frequency of change of direction of the induced e.m.f. is :

A particle of mass $m$ is kept at rest at a height $3R$ from the surface of earth, where $R$ is radius of earth and $M$ is mass of earth. The minimum speed with which it should be projected, so that it does not return back, is : (g is acceleration due to gravity on the surface of earth)

A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using :

The radius of a planet is twice the radius of earth. Both have almost equal average mass-densities. $v_P$ and $v_E$ are escape velocities of the planet and the earth, respectively, then

Among the following ethers, which one will produce methyl alcohol on treatement with hot concentrated HI ?

The structure of isobutyl group in an organic compound is :-

What is the hybridisation state of benzyl carbonium ? :-

Which group includes protozoa, protistan algae and slime moulds

During the process of isolation of DNA, chilled ethanol is added to :

Enzymes present in gastric juice of stomach are

Which one of the following is one of the paths followed by air or O2 during respiration in the adult male Periplaneta americana as it enters the animal body?

A wire of resistance $4 \, \Omega$ is stretched to twice its original length. The resistance of stretched wire would be :

During muscle contraction in humans, the

Dettol is the mixture of :

A metal has a $fcc$ lattice. The edge length of the unit cell is $404\, pm$. The density of the metal is $2.72\,g$ $cm^{-3}$. The molar mass of the metal is :

Cell-mediated immunity in the human body is carried out by

How many grams of cobalt metal will be deposited when a solution of cobalt (II) chloride is electrolyzed with a current of 10 amperes for 109 minutes (1 Faraday = 96,500 C; Atomic mass of Co = 59 u) :

According to Darwin, the organic evolution is due to :

Product of sexual reproduction generally generates

What is the correct sequence of sperm formation?

If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child ?

If two persons with 'AB' blood group marry and have sufficiently large number of children, these children could be classified as 'A' blood group : 'AB' blood group 'B' blood group in 1 : 2 : 1 ratio. Modern technique of protein electrophoresis reveals presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of :

Down's syndrome in humans is due to

The pair of species that has the same bond order in the following is :