List of practice Questions

A fern differs from a moss in having

Female cone of Pinus is a

Prothallus of the fern produces

In Funaria capsule dispersal of spores takes place through

Fern spores are usually

Which one of the following classes is included under gymnosperms ?

Which of the following statements about Spirogyra is correct?

Natural system of classification was given by

Phylogenetic system of classification is based on

Given that the abundant of isotope $^{54}Fe$, $^{56}Fe$ and $^{57}Fe$ are $5\%$, $90\%$ and $5\%$ respectively, the atomic mass of $Fe$ is :

An organic compound made of $C, H$ and $N$ contains $20\%$ nitrogen. Its molecular weight is :

25 mL of 0.08 N Mohr's salt solution is oxidised by 20 mL of $K_2Cr_2O_7$ in acidic medium. The mass of Mohr's salt present in 500 cc is

What is the molarity of $H _{2} SO _{4}$ solution that has a density of $1.84\, g / cc$ at $35^{\circ} C$ and contains $98 \%$ by weight?

One atom of an element weighs $ 1.8\times 10^{-22}g$ . Its atomic mass is

To a $25 \,ml \,H _{2} O _{2}$ solution, excess of acidified solution of KI was added. The iodine liberated required $20\, ml$ of $0.3 \,N \,Na _{2} S _{2} O _{3}$ solution.

The surface charge density (in $ Cm^{-2} $ ) of the earth is about

Under the influence of the coulomb field of charge $+\,Q$, a charge $-\,q$ is moving around it in an elliptical orbit. Find out the correct statement(s).

Gausss law is valid for

Figure below show regular haxagons, with charges at the vertices. In which case is the electric field at the centre zero ?

A charge $Q$ is uniformly distributed over a large square plate of copper. The electric field at a point very close to the centre of the plate is 10 $ Vm^{ -1}$. If the copper plate is replaced by a plastic plate of the same geometrical dimensions and carrying the same charge $Q$ uniformly distributed, then the electric field at the point $P$ will be

A pendulum bob of mass $m$ carrying a charge $q$ is at rest with its string making an angle $\theta$ with the vertical in a uniform horizontal electric field $E$. The tension in the string is

The reiation between electric field vector E, the displacement vector D and the polarization vector P for a dielectric placed in electric field E is given by

A charge $Q$ is placed at each of the opposite corners of a square. A charge $q$ is placed at each of the other two corners. If the net electrical force on $Q$ is zero, then the $Q/q $ equals

Four charges are arranged at the corners of a square as shown in the figure. The direction of electric field at the centre of the square is along

For real $x,$ let $f (x) = x^3 + 5x + 1,$ then