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17 M
[Total 5]
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]
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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