NIOS Class 10 Science and Technology Chapter 2: MATTER IN OUR SURROUNDINGS – Chapter-wise Important Questions and Answers

NIOS Class 10 Science and Technology Chapter 2: MATTER IN OUR SURROUNDINGS | MCQs, Short & Long Answer Questions | 2. MATTER IN OUR SURROUNDINGS

Chapter 2. MATTER IN OUR SURROUNDINGS

INTEXT QUESTIONS 2.1

1. What is matter?

Answer: Matter is anything that has mass and occupies space.

2. Which of the following is not a pure substance?

(a) Iron (b) Water (c) Soil

Answer: (c) Soil .

[  Iron → pure substance (an element)

Water → pure substance (H₂O)

Soil → not a pure substance .]

 

3. Who coined the term “atom” and what does it mean?

Answer: The term “atom” was coined by Democritus.
The word atom means “indivisible” .

 

INTEXT QUESTIONS 2.2

1. Which of the three states of matter has no definite volume? Give one reason for your answer.

Answer: (c) Gas

A gas has no definite volume because the intermolecular forces are very weak, so the gas molecules are far apart and move freely in all directions. Therefore, a gas expands to fill any container, no matter its size.

2. Why do solids have definite shape?

Answer: The molecules in solids have fixed positions, and strong intermolecular forces act between them. Therefore, solids have a definite shape.

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