A ray passing through the principal focus of a concave mirror after reflection will emerge parallel to the principal axis.

1. Laws of conservation of mass:
In a chemical change the total mass of the reactant is equal to the total mass of the products.
2. Law of definite proportion:
"A pure chemical compound prepared by any method consists of the same elements combined together in the fixed proportion by mass".
3. Law of multiple proportion: 
When two elements A and B combine together to form more than one compound, then masses of A which separately combines with a fixed mass of B are in simple ratio.
4. Laws of Reciprocal proportion:
"If two elements combine separately the same weight of a third element, the ratios of the masses in which they do so are either the same or a simple multiple of the mass ratio in which they combine.
5. Gay Lussac's law of combining volumes:
Whenever gases react together, the volumes of the reacting gases as well as the products bear a simple whole number ratio, provided all the volumes are measured under similar conditions of temperature and pressure.

A standard unit is defined as a specific magnitude of a physical quantity that has been adopted by law or convention.

9.8 = 1 kg mass
98 N = ?
\(\text{Mass of the object }=\frac{98\times1}{9.8}=10\ kg\)

1. Fishes are poikilothermic, aquatic vertebrate with jaw.
2. Body is streamlined and differentiated into head, trunk, and tail.
3. Locomotion is by paired and median fins.
4. Body has covering of scales.
5. Respiration is performed by gills. Gill slits are 5-7 pairs.

Rf value is defined as the ratio of the distance travelled by the solute spots to the distance travelled by the solvent
 Rf = \(\frac { Distance\ travelled\ by\ the\ solute }{ Distance\ travelled\ by\ the\ solvent } \)

'Photo' means 'light' and 'synthesis' means 'to build' thus photosynthesis literally means "building up with the help of light". During this process, the light energy is converted into chemical energy. Green plants are autotrophic in their mode of nutrition because they prepare their food materials through a process called photosynthesis.

In plants the movement of opening and closing of the flowers are not directed towards stimuli. Such movement in plants are called as Nastic movements.

Generations of Computer:

Food Safety and Standards Authority of India

   Agricultural Marking

If both Assertion and reason are true and the Reason is the correct explanation of Assertion.

Both A and R are true and R is the correct reason

Assertion is false but reason is true.