List of practice Questions

Cri-du-chat syndrome in humans is caused by the-

The radioactivity of a sample is x at time $t_1$ and is y at time $t_2$. If the mean life of the specimen is $\tau$, the number of atoms that have disintegrated in the time interval $(t_2 - t_1)$ is

Emission of light stops as the incident light is cut-off in

You are given n resistors, each of resistance r. They are first combined to get minimum possible resistance, then they are connected to get the maximum possible resistance. The ratio between rrurnmum to maximum resistance is

At same temperature, which pair of the following solutions are isotonic solutions ?

A critical angle for a medium is $60^\circ.$ Then the refractive index of the medium will be

If the electric current in a lamp decreases by $5 \%,$ then the power output decreases by

In a transistor amplifier, the two AC current gains $\alpha $ and $ \beta $ are defined as $\alpha=\frac{\partial I_C}{\partial I_E} $ and $ \beta =\frac{\partial I_C}{\partial I_B}$ the relation between $\alpha$ and $\beta$ is

If the magnetic flux is represented in weber, then the unit of magnetic induction will be

During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process $ { Proteins ->[{\text{Enzyme(A)}}] Polypeptides }$ $ { ->[{\text{Enzyme(B)}}] Amino acids,}$ are respectively

Which of the following is biodegradable polymerof polyamide class ?

The electric potential at the surface of an atomic nucleus (Z = 50) of radius $ 9 \times 10^{ - 15} \, m$ is

As electric dipole placed in a non-uniform electric field in such a way that angle between $p$ and $E$ is not $0^\circ$ or $ 180^\circ $, so it experiences

Two capacitors of capacitance $C_1$ and $C_2$, are connected in parallel. If a charge Q is given to the combination, the charge gets shared. The ratio of the charge on the capacitor $C_1$ to the charge on the capacitor $C_2$ is

D(+) lactic acid is obtained from

Which product formed during the reaction between sodium phenoxide and ethyl iodide on heating?

A bar magnet is held at right angles to a uniform magnetic field. The couple acting on the magnet is to be halved by rotating it from this position. The angle of rotation is

A block of mass $ 2\,kg $ rests on a horizontal surface. If a horizontal force of $ 5\,N $ is applied on the block the frictional force on, it is $ (\mu _{k}=0.4,\,\mu _{s}=0.5) $

Electromagnetic waves can be deflected by

Which one of the following is a peptide hormone:-

The human body does not produce

The velocity $v$ of a particle at time $t$ is given by $v=at+\frac{b}{t+c}$ , where $a$, $b$ and $c$ are constants. The dimensions of $a$, $b$ and $c$ are, respectively,

Which of the following is more basic than aniline ?

Golden Rice is a promising transgenic crop. When released for cultivation, it will help in

An important evidence in favour of organic evolution is the occurrence of: