List of practice Questions

Natural killer lymphocytes are an example for

Seeds without fertilization is obtained from

In a human foetus the limbs and digits develop after

The 2000 year old seed excavated from King Herod's palace at dead sea belong to

The codon AUG has dual function. It is an initiation codon and also codes for

The T-wave in an ECG represents

A man takes a step forward with probability $0.4$ and one step backward with probability $0.6$, then the probability that at the end of eleven steps he is one step away from the starting point is

Copper is extracted from Copper pyrites by heating in a Bessemer converter. The method is based on the principle that

The salt which responds to dilute and concentrated $H_2SO_4$ is

The polarizing angle of glass is $57^\circ$. A ray of light which is incident at this angle will have an angle of refraction as

To observe diffraction, the size of the obstacle

Using MOT, compare $O_2^+$ and $O_2^-$ species and choose the incorrect option.

In a first order reaction, the concentration of the reactant is reduced to $12.5\%$ in one hour. When was it half completed ?

One of the following amide will not undergo Hoffmann bromamide reaction :

The RMS velocity of $CO$ gas molecules at $27^{\circ}$C is approximately $1000\, m/s$. For $N_2$ molecules at $600 \,K$ the RMS velocity is approximately

For the reaction $A+2 B \longrightarrow C$, the reaction rate is doubled, if the concentration of $A$ is doubled. The rate is increased by four times when concentrations of both $A$ and $B$ are increased by four times. The order of the reaction is

Addition of sodium thiosulphate solution to a solution of silver nitrate gives $X$ as white precipitate, insoluble in water but soluble in excess thiosulphate solution to give $Y$. On boiling in water, $Y$ gives $Z . X, Y$ and $Z$ respectively are

Block $B$ lying on a table weighs $W$. The coefficient of static friction between the block and the table is $\mu$. Assume that the cord between $B$ and the knot is horizontal. The maximum weight of the block $A$ for which the system will be stationary is

Which of the following does not use the principle of electromagnetic induction?

Two copper spheres having same radii, one solid and other hollow, are charged to the same potential. Which of the following statements is correct?

Particles of masses $m, 2m, 3m, ... , nm$ grams are placed on the same line at distances $l, 2l, 3l, ..., nl$ cm from a fixed point. The distance of centre of mass of the particles from the fixed point in centimetres is

A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches 30$^{\circ}$, the box starts to slip and slides 4.0 m down the plank in 4.0 s The coefficients of static and kinetic friction between the box and the plank will be, respectively

For the given reaction, $H _{2}( g )+ Cl _{2}( g )->2 H ^{+}( aq )+2 Cl ^{-}( aq ) ; \Delta G ^{\circ}=--262 \cdot 4 kJ$ The value of free energy of formation $\left(\Delta G_{f}^{\circ}\right)$ for the ion $C l^{-1}(a q)$, therefore will be

Metal carbonyls are stable due to

Shape of $SF_{4}$ is