List of practice Questions

No work is done on the system, but $ q $ amount of heat is taken out from the system and given to the surroundings. Express the change in internal energy $ (\Delta U) $ of this system and what type of wall does the system have ?

Methemoglobinemia is caused due to the presence of in excess of which of the following in drinking water?

Loudness of sound depends on

$ \displaystyle \lim_{x \to 0} \frac{a^{\tan \, x} - a^{\sin \, x}}{\tan \, x - \sin \, x}$ is equal to $(a > 0)$

$\lim_{x \to \infty} \frac{3x^3 + 2x^2 - 7x + 9 }{4x^3 + 9x - 2 }$ is equal to

$KMnO_4$ on reaction with KOH does not give

In van der Waals equation at constant temperature 300 K, if a = 1.4 atm L mol, V = 100 mL, n = 1 mole, then what is the pressure of the gas?

In the diagram $100 \,kg$ block is hanging from a pulley and force $F$ is applied on the string to keep the system in equilibrium. If the whole system is moving up with a constant velocity $v$, then tension at point $P$ in the string will be

In frog, mesorchium is a thin fold of membrane extending between

In acidic medium, which of the following becomes colourless?

Golgi apparatus is absent in

Glycosylation of proteins is done by

Gas in a cylinder is maintained at $10 \,atm$ pressure and $300\, K$ temperature. The cylinder will explode if pressure of gas goes beyond $15\, atm$. What is the maximum temperature to which gas can be heated?

F-centre is

Eye spot is seen in

Diagrams of hypogynous, perigynous and epigynous flowers are given below. Find out the option that correctly exemplifies A, B, C and D.

Developing spermatozoa receive nutrition from

Zone refining is based on the solubility of impurities in the molten state than in the solid state of the metal. Pure metal oxide is obtained in zone refining.

Water waves in a river are not polarized. Water waves are longitudinal as well as transverse in nature.

Transpiration occurs only when stomata are open. Transpiration occurs only through stomata.

Surface tension decreases with increases in temperature. On increasing temperature kinetic energy increases and intermolecular forces decreases..

$Si??i$ bonds are much stronger than $Si??$ bonds. Silicon forms double bonds with itself.

Respiratory pathway is an amphibolic pathway. In respiration, there is breakdown of many substances (catabolism) and synthesis of many substances (anabolism) by respiratory intermediates.

$Pb_3O_4$ reacts with $HNO_3$ and forms $PbO_2$. Lead is stable in $+4$ oxidation state.

Oxidation state of hydrogen is +1 in $H_2O$ while -1 in $CaH_2$. $CaH_2$ is a metal hydride and for hydrides, hydrogen is assigned the oxidation number of -1.