Question

Q.NO. (19 TO 28) are Assertion – Reason type questions. Four options are given below. Select the

correct option for each question.

A) Both Assertion and Reason are true and reason is the correct explanation of Assertion.

B) Both Assertion and Reason are true but reason is not the correct explanation of Assertion.

C) Assertion is true but Reason is false.

d) Assertion is false but reason is true.

19. Assertion: Alloys are homogenous mixture of metals.

Reason: Alloys cannot be separated in to their components by physical methods.


20. Assertion: A solution can scatter a beam of light passing through it..

Reason: The particles of solution are smaller than 1nm in diameter.


21. Assertion: Not all cells in human body look alike in terms of structure.

Reason: Structure of cell is determined by the function it performs.


22. Assertion: Human RBCs burst in hypotonic solution.

Reason: Cells burst due to endosmosis.


23. Assertion: Burning a matchstick is a chemical change.

Reason: During burning of match stick no new substance is formed.


24. Assertion: A gas exerts pressure on the walls of the container.

Reason: Rate of diffusion of gases is more than that of liquids.


25. Assertion: Mitosis type of cell division helps in growth and repair of tissues in organisms.

Reason: Daughter cells produced by mitosis have not same number of chromosomes as mother cell.


26. Assertion: Mitochondria are able to make some of their own proteins.

Reason: They have their own DNA and ribosome.


27. Assertion: Heat energy when supplied to solid, it starts melting.

Reason: Solid particles take up the heat helps in melting.


28. Assertion: Naphthalene ball disappears with time without leaving any solid residue.

Reason: Naphthalene ball gets converted into vapors due to evaporation.​

Answer 1

Answer:

24. Assertion: A gas exerts pressure on the walls of the container.

Reason: Rate of diffusion of gases is more than that of liquids.