List of practice Questions

Select the correct pair amongst the following.

Rubber is commercially obtained from

RNA interference involves

Predict in which of the following entropy decreases.

Polaroid glass is used in sun glasses because

If $x, v$ and $a$ denote the displacement, the velocity and the acceleration of a particle executing simple harmonic motion of time period $T$, then, which of the following does not change with time?

Photochemical smog is formed in

Particle $A$ makes a perfectly elastic collision with another particle $B$ at rest. They fly apart in opposite directions with equal speeds. The ratio of their masses $m_A/m_B$ is

Oxidation state of iron in haemoglobin is

Occurrence of triploid (3n) primary endosperm nucleus is a characteristic feature of

Number of meiotic divisions necessary to produce 100 seeds in cyperus is

Nucleic acids are polymers of

Non-endospermous seeds are found in

Moment of inertia of a uniform rod of length $L$ and mass $M$, about an axis passing through $L/4$ from one end and perpendicular to its length is

Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at $25^\circ $C. For this process, the correct statement is

Meristematic tissue responsible for increase in girth of tree trunk is

Least quantity of urea is found in

$K_2Cr_2O_7$ in acidic medium converts into

Interfascicular cambium is

India is one of the twelve megadiversity countries with ____ of genetic resources of the world.

In wheat, the anthers are

In the preparation of $ HNO_{3}$ we get $NO$ gas by catalytic oxidaton of ammonia. The moles of $NO$ produced by the oxidation of two moles of $NH_{3}$ will be

In human beings, lungs are divided into

In $BF_3$, the $B??F$ bond length is $1.30\, ??, when $BF_3$ is allowed to be treated with $Me_3N$, it forms an adduct, $Me_3N \to BF_3$, the bond length of $B ??F$ in the adduct is

In an intrinsic semiconductor band gap is $1.2\, eV$ then ratio of number of charge carriers at $600\, K$ and $300\, K$ is