List of practice Questions

If $\left(\frac{1+i}{1-i}\right)^{x}=1,$ then

Heat liberated' when 100 mL of 1 N NaOH isneutralised by 300 mL of 1 N HCl

In a lime kiln, to get higher yield of $CO_2$, the measure that can be taken is

Weight of a body of mass m decreases by $1%$ when it is raised to height $h$ above the earth's surface. If the body is taken to a depth $h$ in a mine, change in its weight is

During depression of freezing point in a solution the following are in equilibrium

Mixture X= 0.02 mole of $[Co(NH_3)_5SO_4]Br $ and 0.02 mole of $[Co(NH_3)_5Br]SO_4 $ was prepared in 2 L of solution. 1 L of mixture X + excess $AgNO_3 \rightarrow Y $ 1 L of mixture X + excess $BaCI_2 \rightarrow Z $ Number of moles of Y and Z are

The term "antibiotic" was coined by : -

Which of the following plants are used as green manure in crop fields and in sandy soils:

In a random mating population in equilibrium, which of the following brings about a change in gene frequency in a non-directional manner:

Which one of the following statements about viruses is correct ?

Viruses are no more 'alive' than isolated chromosomes because

A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved the new value of the magnetic field is

A ball is thrown vertically upwards. Which of the following plots represents the speed-time graph of the ball during its flight if the air resistance is not ignored?

If retardation produced by air resistance of projectile is one-tenth of acceleration due to gravity, the time to reach maximum height:

The Biogenetic Law was proposed by_________

A charged particle moves along the line AB which lies in the same plane of a circular loop of conducting wire as shown in the figure above. Then

The inward and outward electric flux from a closed surface are respectively $8\times 10^3$ and $4\times 10^3$ unit. Then the net charge inside the closed surface is

The displacement-time graph of a particle executing SHM is as shown in the figure The corresponding force-time graph of particle is

A pressure cooker reduces cooking time for food because :

If vibration of string are to be two times, then tension in the string must be made:

A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12 cm below the surface of water, the radius of circle in centimetre is

Coefficient of $t^{24} $ in $ (1+t^2)^{12}) (1+t^{12}(1+t^{24})$ is

The shape of a molecule of NH$_3$, in which the central atom contains a lone pair of electrons, is