Question

Antibiotics commonly block biochemical pathways important for the growth of

(A) Virus

(B) Bacteria

(C) Protozoa

(D) All above

SECTION B

21.

Write any two differences between Distance and Displacement

2

22.

A car starts from rest and attains a velocity of 20m/s in 5s. Calculate the distance during this

time.

2

23.

Write the formula of Calcium and Sulphate ions. Also write the formula of the compound

between them.

(Or)

Find the molecular mass of H2O.

2

24.

When Magnesium ribbon is burnt in air, write any two observations and name the type of

the reaction.

2

25.

Write two differences between mass and weight.

2

26.

Name the different components of xylem and draw a living component?

Or

Differentiate between voluntary and involuntary muscles. Give one example of each type.

2

SECTION C

27.

Name the method used to separate the following mixtures.

a) Miscible liquids

b) Dye from ink

c) Components of air.

3

28.

i) Draw the sketch of Bohr model of atom

ii) What do you mean by ATOMIC NUMBER.

iii) How many electrons can be accommodated in n=3 shell in Bohr model of atom.

3

29.

i) Define atomic mass unit.

ii) What is the numerical value of mole.

iii) Name the elements present in oxide ion.

3

30.

State Newton’s second law of motion. Derive F = ma

3

31.

Give three features of cardiac muscles. How can distinguished from skeletal muscle.

3​

Answer 1

Answer:

d) All of the above

Explanation:

29. i) a unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12.