Class 9 Physics Unit-7: Properties of matter, Solved MCQs With Verified Answers. (Sindh Textbook Board, Jamshoro)

1. An object with particles close together and vibrating describes a _______________.

(a) Gas
(b) Liquid
(c) Solid
(d) All three

... Answer is (c) Solid
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2. A burning candle is an example of _______________ state of matter.

(a) Gas
(b) Liquid
(c) Solid
(d) All three

... Answer is (d) All three
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3. During which process a gas becomes a liquid________________.

(a) Melting
(b) Freezing
(c) Condensing
(d) Boiling

... Answer is (c) Condensing
Fy = F sin θ = 12.990 N

4. A solid can _____________.

(a) have a fixed shape
(b) be easily compressed
(c) take a shape of the container
(d) have freely moving molecules

... Answer is (a) have a fixed shape
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5. According to kinetic molecular theory, the pressure exerted by a gas is caused by the ___________.

(a) bombardment of the gas molecules on the walls of the container.
(b) a collision between gas molecules.
(c) large distances between gas molecules.
(d) random motion of the gas molecules.

... Answer is (a) bombardment of the gas molecules on the walls of the container.
All the gases exert pressure on the walls of their container

6. If a gas is heated in a sealed cylinder, then _____________ increases.

(a) the pressure inside the container
(b) the average kinetic energy of the particles
(c) the temperature of the gas
(d) All of them

... Answer is (d) All of them
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7. A gas in a container of fixed volume is heated. What happens to the molecules of the gas? :

(a) They collide less frequently.
(b) They expand.
(c) They move faster.
(d) They move further apart.

... Answer is (c) They move faster.
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8. In a liquid, some energetic molecules break free from the surface even when the liquid is too cold for bubbles to form. What is the name of this process?

(a) boiling
(b) condensation
(c) convection
(d) evaporation

... Answer is (d) evaporation
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9. What happens to the molecules of a gas when the gas changes into a liquid?

(a) They move closer and lose energy.
(b) They move closer and gain energy.
(c) They move apart and lose energy.
(d) They move apart and gain energy

... Answer is (a) They move closer and lose energy.
During condensation molecules of gas cool down and lose heat, they lose energy and slow down

10. A substance has a melting point of –17 °C and a boiling point of 117 °C. In which state does the substance exist at –10 °C and at 110 °C?

(a) Solid, liquid
(b) Solid, gas
(c) liquid, liquid
(d) liquid, gas

... Answer is (c) liquid, liquid
At both given temperatures the substance would be in a liquid state.

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