The real value of 'a' for which sum of square of the roots of the equation x*x -(a-3)x -(a+1) =0 assume the least value is?

How does cortical reaction prevents the entry of additional sperms into ovum?

Pollen grains are well preserved as microfossils due to the presence of sporopollenin. Explain the statement?

How does dicliny differs from prepotency as two outbreeding contrivances?

The chance of survival among young ones of viviparous animals are more than those of oviparous animals, why?

Name an organism showing oblique binary fission?

What are Lipids? Explain its functions?

What is Biomolecules?

What is Cytoskeleton? Please explain?

A regular polygon of nine sides, each of length 2, is inscribed in a circle. The radius of the circle is?

## Why Berilium and Al are placed in different periods and groups but they show the similar properties?

Why Berilium and Al are placed in different periods and groups but they show similar properties?

Why The radii of Ar is greater than the radii of chlorine?

Why Viroids differ from viruses?

A swimmer can swim in still water with a speed of 5 m/s. While crossing a river his average speed is 3 m/s. If he cross the river in the shortest possible time, what is the speed of flow of water?

Lichens are well known combination of an alga and a fungus where fungus has?

A current of 3 ampere was passed for 2 hours through a solution of CuSO4. 3 gm of Cu2+ ions were discharged at cathode calculate the current efficiency.

Cellulose is the major component of cell walls of?

The imperfect fungi which are decomposers of litter and help in mineral cycling belong to?

Chrysophytes, Euglenoids, Dinoflagellates and Slime moulds are included in the kingdom?

Bacterial cell divides every one minute. It takes 15 minutes a cup to be one-fourth full. How much time will it take to fill the cup?

Domain Eukarya includes how many kingdoms (w.r.t. six kingdom system)?

The protein coat called capsid made of small subunits called capsomeres are present in?

The sex organs are absent, but plasmogamy is brought about by fusion of two vegetative or somatic cells of different genotypes. It is the feature of?

Position of bacteria in the kingdom system of classification proposed by Linnaeus is?

During favourable conditions bacteria mainly reproduce by

1 mL of 10–5 M HCl solution is diluted to 1000 mL. Calculate the pH of the resulting solution?

If a man weighs 90 N on the surface of the Earth, then the height above the surface of the earth of radius R, when the height is where the weight is 30N is

A.0.73R

B. R/√3

C.3R

D.√3R

A sample of a gas initially at 27°C is compressed from 40 litres to 4 litres adiabatically and reversibly. Calculate the final temperature (Cv = 5 cal/mole)

Copper sulphate solution (250 ml) was electrolyzed using a platinum anode and copper cathode. A constant current of 2 mA was passed for 16 minute. It was found that after electrolysis, the absorbance of the solution was reduced to 50% of its original value. Calculate the concentration of copper sulphate ion in the solution to begin with.

Number of ways in which 7 girls & 7 boys can be arranged such that no two boys and no two girls are together is?

The configuration of the C-2 epimer of D-glucose is

In low temperature range fraction of heat supplied to an ideal diatomic gas system, at constant pressure, which bring change in its internal energy is approx.......?

Consider a parabola

and a hyperbola XY = 1. A tangent is drawn to parabola meets the hyperbola in A and B then the locus of midpoint of AB is

The total number of 1 word, 2 word, 3 word sentences that can be formed using the letters of the word SAMSUNG is?

For n => 3 circles, the value of n for which the number of the radical axis is equal to number of radical centres is?

A compound is composed of two elements A and B, element A constitute f.c.c. lattice, while B occupy all the tetrahedral voids, in this way another simple cubic is constituted by element B, inside the fcc unit cell of element A. If all the points/particles along any one edge of inner cube of every unit cell, are missing then what is the new empirical formula of the compound?

The specific heat capacity of a monoatomic gas for the process T*V*V = constant is (where R is gas constant)?

A block of mass 2 kg is attached to one end of a massless rod of length . The rod is fixed to a horizontal plane at the other end such that the block and rod are free to revolve on a horizontal plane. The coefficient of friction between the block and surface is 0.1. Block is made to rotate with uniform speed by applying a constant external force in tangential direction on the block. The work is done by external force when the rod rotates by 90 degree is

In low temperature range fraction of heat supplied to an ideal diatomic gas system, at constant pressure, which bring change in its internal energy is approx.?

The area enclosed between the curves

A block is suspended by an ideal spring constant K. If the block is pulled down by constant force F and if the maximum displacement of the block from it’s the initial position of rest is z, then find the value of z

Resonance Energy of Toluene is 37.5 kcal/mol while that of Benzene is 36 kcal/mole then which of the following explains this difference?

If A is the areal velocity of planet of mass M, its angular momentum is?

In a hypothetical concept, electron of mass me revolveds around nucleus due to gravitational force of attraction between electron and proton of mass mp. If the radius of circular path of electron is r then the speed of electron is ?

Three particles, each of mass 10^-2 kg are brought from infinity to the vertices of an equilateral triangle of side 0.1 m, the work done is :