This document consists of 5 printed pages.

20 M

Test (Unit 6-10) :................................................................................................................

:........................................................ 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

[Total 6]

Dedicated to My Son Mohammad Irtaza Zain. Code 5054

On Fig. 1.1, draw a labelled diagram of the structure of the thermocouple thermometer

Fig. 1.1

Fig. 1.1 shows the flame of a Bunsen burner.1

flame

Bunsenburner

(a) A thermocouple thermometer contains a voltmeter. It is used to measure the temperature in the flame of the Bunsen burner.

(i) as it measures the temperature in the flame. [2]

(ii) Describe how the fixed points and the reading of the voltmeter are used to determine the value of the temperature in the flame.

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(b) The thermocouple thermometer is used to measure the temperature in the flame because it can measure very high temperatures. State and explain one other advantage of using a thermocouple thermometer to determine temperature.

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2 Fig. 2.1 shows an elevator (lift) that is supported by a cable.

motor

cable

pulley

concrete block

elevator

Fig. 2.1 (not to scale)

The cable passes around the axle of an electric motor and over a pulley. The cable is then attached to a concrete block that has the same mass as the empty elevator. As the elevator moves up, the concrete block moves down.

(a) Explain why very little work is done by the electric motor when lifting up the empty elevator.

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(b) Several people of total weight 4900 N are travelling upwards at constant speed in the elevator. They rise through a distance of 24 m in 28 s.

Calculate the minimum power output of the electric motor.

power = ....................................................[3]Irtaz

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Question 3 continues on the next page.

Fig. 3.1

3traps high-pressure gas in a cylinder, as shown in Fig. 3.1.

(a) The force F on the crankshaft at P is exerted by a metal rod connected to a piston. The piston

high-pressure gas

metal rod

piston

force FP

cylinder

The force F, of 8200 N, acts because the high-pressure gas pushes down on the piston. The air pressure outside the cylinder is 1.0 × 105 Pa and the cross-sectional area of the piston is 0.0067 m2.

(i) Calculate the minimum value of the pressure of the gas in the cylinder.

pressure = ....................................................[3]

(ii) Suggest why, in practice, the pressure of the gas in the cylinder is greater than the value calculated in (i).

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(c) The piston moves in the cylinder and the gas expands. State and explain what happens to the force F.

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(d) Explain, in molecular terms, why heating a gas at constant volume causes its pressure to increase.

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[Total 9]

To raise the temperature of a 2.0kg block of metal by 20 °C, energy of 5.2 kJ is needed.

What is the value of the specific heat capacity of the metal?

A 0.13J / (kg °C)

B 52J / (kg °C)

C 130J / (kg °C)

D 52 000J / (kg °C)

What makes a clinical thermometer suitable for measuring small changes in body temperature?

A The amount of mercury in the bulb is small.

B The bore of the capillary tube is narrow.

C The capillary tube is long.

D The glass bulb has a thin wall.

A man pushes a heavy box across a floor. He exerts a force of 80 N and the box moves 4.0 m in 5.0 seconds.

What useful power does the man develop?

A 4.0 W B 64W C 100W D 1600W

5 MCQ SECTION: [Total Marks]

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In an energy transformation sequence, what produces kinetic energy from gravitational potential energy as part of the sequence?

A burning fuel in a power station

B generating hydroelectric energy

C generating energy in a nuclear power station

D generating energy in a geothermal power station

Which property is essential to a clinical thermometer?

A It contains mercury.

B It has a constriction in its bore.

C It has a range of 40 °C.

D It is accurate to 0.001 °C.

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

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