List of practice Questions

Circulatory system in earthworm is

Chromophil cells are found in:

For reversible process, the value of $\Delta S$ is gives by the expression:

When $ {{H}_{2}}S $ gas is passed in a metal sulphate solution in presence of $ N{{H}_{4}}OH $ , a white precipitate is produced. The metal is identified as:

The value of amu is which of the following?

The molecule having largest dipole moment among the following is:

Which one of the following can produce hydrogen when treated with metallic sodium?

$ CH_3COOH $ is weaker acid than $H_2SO_4$ . It is due to:

By sucking through a straw, a student can reduce the pressure in his lungs to $750\, mm$ of $Hg$ (density $= 13.6\, g/cm^3$ ). Using the straw, he can drink water from a glass upto a maximum depth of

The alga used for quick sewage disposal is:

Lactic acid is produced by Rhizopus species:

Biosphere consists of

Avena curvature test is a bioassay for examining the activity of

Water in liquid state is more stable than ice at room temperature. Water in liquid form has higher entropy than ice.

In the iodometric titration starch is used as an indicator. Starch is a polysaccharide.

In optical fibre, the diameter of the core is kept small. This smaller diameter of the core ensures that the fibre should have incident angle more than the critical angle required for total internal reflection.

In angiosperms the conduction of water is more efficient because their xylem has vessels. Conduction of water by vessel elements is an active process with energy supplied by xylem parenchyma rich in mitochondria.

Graphite is an example of tetragonal crystal system. For a tetragonal system, $a=b \neq c, \alpha=\beta$ $=90^{\circ}, \gamma=120^{\circ}$

Cobalt-$60$ is useful in cancer therapy Cobalt-$60$ is a source of $\gamma$-radiations capable of killing cancerous cells.

A thin stainless steel needle can lay floating on a still water surface. Any object floats when the buoyancy force balances the weight of the object.

Animals giving birth to young ones are

Largest bird is

Reptile living both on land and water is

Whale is member of class

Canal system occurs in