MCQ SECTION:[Total 8 Marks]irtazazainsphysics.yolasite.com/resources/Physics Test... · 2012-12-30 · MCQ SECTION:[Total 8 Marks] [Total 6] 2 1 A substance consists of particles

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Test (Unit 9)

Dedicated to My Son Mohammad Irtaza Zain. Code 5054

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UNIQUE SCIENCE ACADEMY

Time Allowed: 35Minutes

Maximum Marks: 25

[Total arks]

Theory Section:

[Turn over

Date :........................................................ Code: 5054 Class: CII

Name :................................................................................................................

Pap er: Physics

Fig. 1.1

Fig. 1.1 illustrates the arrangement of the molecules of a substance in its solid, liquid and1gaseous states.

(a) State which arrangement, A, B or C, contains molecules with the most energy.

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(b) Explain, in terms of the forces between the molecules and their separation, why

(i) gases are easier to compress than liquids,

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(ii)

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solid

A

liquid

B

gas

C

heat is needed to change the substance from solid to liquid.

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Dedicated to My Son Mohammad Irtaza Zain. Code 5054

[Total 6]

[Turn over

Brownian motion.Describe an experimental arrangement to demonstrate2

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Fig. 3.1

Some smoke particles are viewed through a microscope, as illustrated in Fig. 3.1.3

microscope

smoke celllight

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Dedicated to My Son Mohammad Irtaza Zain. Code 5054 [Turn over

Brownian motion is observed.

(a) Explain what is meant by Brownian motion.

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(b) Suggest and explain why Brownian motion provides evidence for the movement of molecules as assumed in the kinetic theory of gases.

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(c) Smoke from a poorly maintained engine contains large particles of soot. Suggest why the Brownian motion of such large particles is undetectable.

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[Total 6]8 MCQ SECTION: [Total Marks]

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1 A substance consists of particles that are close together and moving past each other at

random. The average speed of the particles is gradually increasing.

What best describes the substance?

A a liquid being boiled to form a gas

B a liquid being heated

C a solid being heated

D a solid being melted to form a liquid

A liquid is heated.

Which statement is incorrect?

A The molecules expand.

B The molecules gain energy.

C The molecules move further apart.

D The molecules move faster.

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urn over[TDedicated to My Son Mohammad Irtaza Zain. Code 5054

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Assuming the temperature remains constant, which combination correctly describes the volumeand the shape of a gas or liquid?

A

B

C

D

gas

gas

liquid

liquid

fixed

not fixed

fixed

not fixed

not fixed

not fixed

fixed

fixed

gas or liquid volume shape

What describes the molecular structure of a liquid?

distance between the molecules

motion of the molecules

strength of forces between the molecules

A close together stationary very strong

B close together random fairly strong

C far apart stationary fairly strong

D far apart random weak

Which of the following correctly compares the forces between the molecules in steam, water and ice?

weakest forces

strongest forces

A ice steam water

B ice water steam

C steam water ice

D water steam ice

The molecules of a substance become more closely packed and move more quickly.

What is happening to the substance?

A A gas is being heated and compressed.

B A gas is being heated and is expanding.

C A liquid is boiling.

D A liquid is evaporating at room temperature.

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Dedicated to My Son Mohammad Irtaza Zain. Code 5054

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8 A B C D

7 A B C D

6 A B C D

5 A B C D

4 A B C D

3 A B C D

2 A B C D

1 A B C D

MCQ Answer Sheet

Water spilled on the ground on a hot day evaporates.

Which diagram represents the change in arrangement of the particles in the water as it evaporates?

A

B

C

D

According to the kinetic theory, matter is made up of very small particles in a constant state of motion.

Which row best describes the particle behaviour in the liquid state?

forces between particles

motion of particles

A strong move randomly at

high speed

B strong vibrate but are free to

move position

C strong vibrate to and fro

around a fixed position

D weak move randomly at

high speed