List of practice Questions

Which of the following is correct match of organism and respective structures?

Which of the following is a function of ethylene?

In prokaryotes, enzymes for respiration are found in

Enzymes used in detergents to remove oil stains are sourced from

Incurrent and radial canals in syconoid sponges are interconnected with the help of

Closely linked genes can be separated by

A uniform rod of mass $m$, length $L$, area of cross-section $A$ and Young's modulus $Y$ hangs from a rigid support. Its elongation due to its own weight will be

A uniform solid right circular cone of base radius $r$ is joined to a uniform solid hemisphere of radius $r$ and of the same density, so as to have a common face. The centre of mass of the composite solid lies on the common face. The height of the cone is

An $RL$ circuit in which $R = 5\,\Omega$ and $L = 4\,H$ is connected to a $22\, V$ battery at $t = 0$. For this circuit at what rate the energy is being stored in the inductor when the current in circuit is $1 \,A$ ?

A disc is placed on a surface of pond which has refractive index $5/3$. A source of light is placed $4\,m$ below the surface of liquid. The minimum radius of disc needed so that light is not coming out is

At time $t = 0$, activity of radioactive substance is $1600 \,Bq$, at $t = 8 \,s$ activity falls to $100 \,Bq$. The activity at $t = 2\, s$ is

An echo repeats four syllables. The distance of the reflecting surface, if it takes one-fifth of a second to pronounce or hear one syllable distinctly is (Velocity of sound $= 340\,ms^{-1}$)

In a transistor amplifier, $\beta = 62$, $R_L = 5000\,\Omega$ and input resistance of the transistor is $500\, \Omega$. What is power amplification ?

A thin equiconvex lens of refractive index $\frac{3}{2}$ and radius of curvature $30\, cm$ is put in water (refractive index = $\frac{4}{3})$, its focal length is

A stationary object at $ 4{}^\circ C $ and weighing 3.5 kg falls from a height 2000 m on a snow mountain at $ 0{}^\circ C $ . If the temperature of the object just before hitting the snow is $ 0{}^\circ C $ and the object before comes to rest immediately $ (g=10\text{ }m/{{s}^{2}}) $ and latent heat of ice $ =3.5\times {{10}^{5}} $ J/s), then the object

A spring balance $A$ and a beam balance $B$ are used to weigh the same object at a place on the equator and a place on the pole of the earth. Then

A spherical solid ball of volume $V$ is made of a material of density $\rho_1$ It is falling through a liquid of density $\rho_2(\rho_2 < \rho_1)$. Assume that the liquid applies a viscous force on the ball that is $F = krv$ where $r$ is the radius of the ball and $v$ is the speed and $k$ is the constant of proportionality. The terminal speed of the ball is

"A spherically symmetric gravitational system of particles has a mass density $\rho =\Biggl \{ \begin{array} \ \rho_0 \ \text{for} \ r \le R\\ 0 \ \text{for} r\ > \ R \\ \end{array}$ , where $\rho _0$ is a constant. A test mass can undergo circular motion under the influence of the gravitational field of particles. Its speed v as a function of distance r from the centre of the system is represented by"

A spontaneous reaction is impossible if

Tissue level of organisation is not found in

$A$ and $B$ antigens are not found in which of the following blood group?

A satellite revolves round the earth. Air pressure inside the satellite is maintained at $76 \,cm$ of mercury. What will be height of mercury column in a barometer tube $100\, cm$ long placed in the satellite?

A rigid bar of mass $M$ is supported symmetrically by three wires each of length $L$. Those at each end are of copper and the middle one is of iron. The ratio of their diameters, if each is to have the same tension, is equal to

If $13 e^{i \, \tan^-1} \frac{5}{12}} = a + ib $, then the ordered pair $(a , b) = $

Two point charges $+2C$ and $+ 6C$ repel each other with a force of $12 \,N$. If a charge of $- 2C$ is given to each of these charges the force will now be