List of practice Questions

The progesterone is secreted by

Ozone hole results in

The infection of Enterobius is caused in man by

Histones are

Which of the following rank contains organisms most similar to one another?

Virus envelope is known as

Binomial system of nomenclature has been suggested by

Which of the following process requires ATP ?

Which of the following is biologically the most resistant plant material ?

An equiconvex lens is cut into two halves along (i) $XOX'$ and (ii) $YOY'$ as shown in the figure. Let ${f, f', f'' }$be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively.

Choose the correct statement from the following

A wire is suspended by one end. At the other end a weight equivalent to 20 N force is applied. If the increase in length is 1 mm, the increase in the energy of the wire will be

A spring balance and a physical balance are kept in a lift. In these balances equal masses are placed. lf now the lift starts moving upwards with constant acceleration, then

A sample of radioactive element has a mass of $10\, g$ at an instant $t = 0$. The approximate mass of this element in the sample after two mean lives is

A particle is thrown vertically upwards. Its velocity at half of the height is $ 10\, ms^{ - 1} $ . Then the maximum height attained by it is (Take $g = 10\,ms^{ -2} $ )

Barrier potential of $a p-n$ junction diode does not depend on

A man weighs $80\, kg$. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of $5 \,ms^{-2}$ What would be the reading on the scale? ($g = 10\, ms^{-2})$

An observer moves towards a stationary source of sound with a speed $1 / 5\, th$ of the speed of sound. The wavelength and frequency of the source emitted are $\lambda$ and $f$ respectively. The apparent frequency and wavelength recorded by the observer are respectively

The kinetic energy of $1 \,g$ molecule of a gas, at normal temperature and pressure is $( R = 8.31 \,J \, mol^{-1} \, K^{-1} )$

Consider a compound slab consisting of two different materials having equal thickness and thermal conductivities $K$ and $2K$ respectively. The equivalent thermal conductivity of the slab is

A ball rolls without slipping. The radius of gyration of the ball about an axis passing through its center of mass is $K$. If radius of the ball be $R,$ then the fraction of total energy associated with its rotational energy will be

When a car moves on a road with uniform speed of $30\,km /h$, then the net resultant force on the car is

A ball is projected horizontally with a velocity of $4\,m s^{-1}$ from the top of a tower. The velocity of the ball after 0.7 s is (Take g = 10 $m s^{-2}$)

The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of $^{4}_{2}He$ is Given, mass of helium nucleus $\approx4.0015 u.$

Effect of pollution is observed first on

Which of the following is a protein hormone ?