List of practice Questions

Two parallel large thin metal sheets have equal surface charge densities $\left(\sigma=26.4\times10^{-12} c m^{2}\right)$ of opposite signs. The electric field between these sheets is

A hole is in the bottom of the tank having water. If total pressure at the bottom is $3$ atm $(1 \,atm = 10^{5}\, Nm^{-2})$, then velocity of water flowing from hole is

Advancement in genetic engineering has been possible due to discovery of

All mammals without any exception are characterised by

Which one of the following pairs of the kind of cells and their secretion is correctly matched ?

Genes present in the cytoplasm of eukaryotic cells are found in

A person showing unpredictable moods, outbursts of emotions, quarrelsome behaviour and conflicts with others is suffering from-

Grafting is successful in dicots but not in monocots because the dicots have

In the sieve elements, which one of the following is the most likely function of P-proteins ?

In prokaryotes, chromatophores are

A cricket player is fast chasing a ball in the field. Which one of the following groups of bones are directly contributing in this movement ?

The length, breadth and thickness of a block are given by I= 12 cm, b = 6 cm and t = 2.45 cm. The volume of the block according to the idea of significant figures should be

Acceleration due to gravity at earth's surface is g $ms^{-2}$ Find the effective value of gravity at a height of 32 km from sea level $(R_e = 6400\, km)$

Two waves, represented by the following equations, are travelling in the same medium $\hspace30mm y_1 = 5 sin \, 2 \pi (75 t - 0.25 x)$ $\hspace30mm y_2 = 10 sin \, 2 \pi (150 t - 0.50 x)$ The intensity $\frac{I_2}{I_1}$ of two waves is

A body is just being revolved in a vertical circle of radius R with a uniform speed. The string breaks when the body is at the highest point. The horizontal distance covered by the body after the string breaks is

A judo fighter in order to throw his opponent on to the mat tries to initially bend his opponent and then rotate him around his hip. As the mass of opponent is brought closer to the fighter?s hip, the force required to throw the opponent is reduced.

If a street light of mass $M$ is suspended from the end of a uniform rod of length $L$ in different possible patterns as shown in figure, then :

${ }_{92}^{238} U$ has $92$ protons and $238$ nucleons. It decays by emitting an alpha particle and becomes:

An amplifier has a voltage gain $A_{v}=1000$. The voltage gain in $dB$ is :

When a $p-n$ junction diode is reverse biased, then

Two spheres of same size, one of mass $2\, kg$ and another of mass $4 \,kg$, are dropped simultaneously from the top of Qutab Minar (height $=72\, m$ ). When they are $1 \,m$ above the ground, the two spheres have the same :

A boat at anchor is rocked by waves whose crests are $100\, m$ apart and velocity is $25\, m/\sec$. The boat bounces up once in every

A leaf which contains only green pigments, is illuminated by a laser light of wavelength $0.6328\, \mu m$. It would appear to be :

In refraction, light waves are bent on passing from one medium to the second medium, because in the second medium

Thymine is