List of practice Questions

: Atom as a whole is electrically neutral. : Atom contains equal amount of positive and negative charges.

Atomic number of the element ununtrium is 113. According to $IUPAC$ system of nomenclature, the numerical roots for $1,1$ and $3$ are un, un and tri respectively.

$ATP$ acts as the energy currency of the cell. $ATP$ can be broken down to release energy wherever and whenever energy needs to be utilised.

Auxin was isolated by $F$.$W$. Went from the tips of coleoptiles of wheat seedlings. Ethylene delays the senescence.

Asexual reproduction involves formation of clones of an organism. Clones are morphologically and genetically similar individuals.

At fovea, the visual acuity is the greatest The fovea is a thick area of the retina where both rods and cones are present

At high altitudes, liquids boil at lower temperatures in comparison to that at sea level. At high altitudes, atmospheric pressure is low.

: Angle of deviation depends on the angle of prism. : For thin prism, $\delta = (\mu - 1) A$.

Aryl halides are highly reactive towards nucleophilic substitution reactions. In case of haloarenes, halogen atom is attached to sp hybridised carbon atom.

An object may fall with a constant velocity. This happens when acceleration of the object is equal to acceleration due to gravity.

Anaerobic respiration sometimes occurs in our skeletal muscles during strenous exercise. Pyruvic acid is reduced to lactic acid by lactate dehydrogenase in the absence of oxygen.

Angle and angular displacement are dimensionless quantities. Angle is equal to arc length divided by radius.

All expression vectors are cloning vectors and vice versa. Expression vectors have at least the regulatory sequences i.e., promoters, operators, ribosomal binding sites, etc. having optimum function in the chosen control but not origin of replication.

Alveoli are the primary sites for exchange of gases. All factors in our body are favourable for diffusion of $O_2$ from alveoli to tissues and that of $CO_2$ from tissues to alveoli.

Ammonia acts as a ligand. A lone pair of electrons on nitrogen can be donated to acceptor.

An electric motor converts electrical energy to mechanical energy The working of the motor is based on mutual induction

Abscisic acid $(ABA)$ is also called stress hormone. $ABA$ increases the tolerance of plants to various kinds of stresses.

All copulations do not lead to the fertilisation and pregnancy. Fertilisation can occur only if the ovum and sperms are transported simultaneously to the ampullary - isthmic junction.

Water flows faster than honey. The coefficient of viscosity of water is less than honey.

: When hot water is poured in a thick glass tumbler then the tumbler breaks : Glass is a bad conductor of heat

A typical microsporangium of angiosperms is generally surrounded by four wall layers - epidermis, endothecium, middle layers and tapetum. The outer three wall layers perform the function of protection and help in dehiscence of anther to release the pollen.

: Stress is restoring force per unit area. : Interatomic forces in solids are responsible for the property of elasticity

Surface tension has same units as force gradient Surface tension is the force gradient along the suiface of liquide

The viscosity of liquid decreuses with rise of temperature. Viscosity of a liquid is the property of the liquid by virtue of which it opposes the relative motion amongst its different layers.

A single outcross often helps to overcome inbreeding depression. Out-crossing is best breeding method for increasing milk productivity.