[Total 5

[2]

17 M

Test (Unit 4-10) :................................................................................................................

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

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heory Section:

T [Total arks]

Time Allowed: 35Minutes

Maximum Marks: 25

NIQUE SCIENCE ACADEMY U

Date

Name

Paper: Physics

1

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Dedicated to My Son Mohammad Irtaza Zain. Code 5054

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State its unit. 1 (a) Define density.

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(b) A U-tube contains some mercury. Water is poured into one arm of the U-tube and oil is

The amounts of oil and water are adjusted until the surface of the mercury in the twoarms is at the same horizontal level.

(i) State how it is known that the pressure at the base of the column of water is thesame as the pressure at the base of the column of oil.

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(ii) The column of water, density 1.0 × 103 kg m–3, is 53 cm high. The column of oil is71 cm high.

Calculate the density of the oil. Explain your working.

density = ………………………………. kg m–3

71cm53cm

water

oil

mercury

poured into the other arm, as shown in Fig.1.1.

Fig. 1.1

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2

Fig. 2.1

, as illustrated in Fig. 2.1.A stone of mass 56 kg is thrown horizontally from the top of a cliff with a speed of 2 (a) 18 m s–1

16m

sea level

18 m s–1

The initial height of the stone above the level of the sea is 16 m. Air resistance may be neglected.

(i) Calculate the change in gravitational potential energy of the stone as a result of falling through 16 m.

change = ............................................... J [2]

(ii) Calculate the total kinetic energy of the stone as it reaches the sea.

(a) A plastic bag contains air. What causes the air molecules to exert a pressure on the inside of the bag?

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[Total 5]

kinetic energy = .............................................. J [3]

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[2]

[1]

(b) The graph shows how air pressure varies with height.

A mountaineer on the top of Mount Everest seals some air in a plastic bag. The volume of the plastic bag is 0.00060 m3. The height of Mount Everest is 9.0 km.

(i) What is the air pressure at a height of 9.0 km?

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(ii) The air pressure at sea level is 100 kPa. Calculate the volume of the plastic bag when the mountaineer returns to sea level.

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(iii) State two assumptions that you have made in your calculation.

1 ..............................................................................................................................

2 ..............................................................................................................................

[2]

[2]

[Total 7]

A mass of a liquid of density ρ is thoroughly mixed with an equal mass of another liquid of density2ρ. No change of the total volume occurs.

What is the density of the liquid mixture?

A ρ B ρ C ρ D 3ρ5_3

3_2

4_3

8 MCQ SECTION: [Total Marks]

4

3

2

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

4A trolley runs from P to Q along a track. At Q its potential energy is 50 kJ less than at P.

At P, the kinetic energy of the trolley is 5 kJ. Between P and Q the work the trolley does againstfriction is 10 kJ.

What is the kinetic energy of the trolley at Q?

A 35 kJ

B 45 kJ

C 55 kJ

D 65 kJ

To travel at a constant speed, a car engine provides 24 kW of useful power. The driving force onthe car is 600 N.

At what speed does it travel?

A 2.5 m s–1

B 4.0 m s–1

C 25 m s–1

D 40 m s–1

P

trolley

Q

Which of the following expressions defines power?

A force x distance moved in the direction of the force

B force x velocity

C work done ÷ time taken

D work done x time taken

7

6

5

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5

A weight W hangs from a trolley that runs along a rail. The trolley moves horizontally through adistance p and simultaneously raises the weight through a height q.

As a result, the weight moves through a distance r from X to Y. It starts and finishes at rest.

How much work is done on the weight during this process?

A Wp B W(p + q) C Wq D Wr

railtrolley

weight W

r

p

q

X

Y

What must expand in order to show the temperature rise in a mercury-in-glass thermometer?

A the glass bulb

B the glass stem

C the mercury

D the vacuum

The size of a balloon increases when the pressure inside it increases.

The balloon gets bigger when it is left in the heat from the Sun.

Why does this happen?

A The air molecules inside the balloon all move outwards when it is heated.

B The air molecules inside the balloon are bigger when it is heated.

C The air molecules inside the balloon move more quickly when it is heated.

D The number of air molecules inside the balloon increases when it is heated.

cool balloon hot balloon

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Dedicated to My Son Mohammad Irtaza Zain. Code 5054

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4 A B C D

3 A B C D

2 A B C D

1 A B C D

MCQ Answer Sheet

When it is hit, which nail causes the least pressure on the wood?

Two sharp nails and two blunt nails are held on a piece of wood. Each nail is hit with the samehammer with the same amount of force.

A Bhammer

sharp nails

C Dhammer

blunt nails

8 A B C D

7 A B C D

6 A B C D

5 A B C D