This document consists of 6 printed pages.

19 M

Test (Unit 16-20) :................................................................................................................

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

Fig. 1.1

Fig. 1.1 shows a loudspeaker cone oscillating to produce sound waves.1

cone oscillates toproduce sound waves

loudspeakercone

(a) As the sound wave passes a point, it produces regions of higher and lower pressure. State the names of these regions.

higher pressure ..........................................................

lower pressure .......................................................... [2]

(b) Describe how the movement of the loudspeaker cone produces these regions of different pressure.

higher pressure .........................................................................................................................

...................................................................................................................................................

lower pressure ..........................................................................................................................

.............................................................................................................................................. [2]

(c) State the effect on the loudness and pitch of the sound from the loudspeaker when

(i) the amplitude increases but the frequency of the sound stays the same,

loudness ............................................................................................................................

pitch ...................................................................................................................................

(ii) the amplitude stays the same but the frequency increases.

loudness ............................................................................................................................

pitch ...................................................................................................................................[2]Irt

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2 A student learning about electric circuits connects up the circuit shown in Fig. 2.1.

Fig. 2.1

In the space below, draw the circuit diagram of the arrangement shown in Fig. 2.1, using

batteryammeter

coil ofwire

variable resistor(rheostat)

210 3

AMPS

45

(a) The student has already made one mistake with his connections.

What is his mistake?

...............................................................................................................................................[1]

(b) standard symbols. [2]

(c) The student now connects a voltmeter to the circuit, so that readings can be taken to find the resistance of the coil of wire. On your circuit diagram, draw the voltmeter, connected to measure the potential difference across the coil. [1]

[Total 4]

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Fig. 3.1

Fig. 3.1 shows a circuit containing a 12 V power supply, some resistors and an ammeter whose 3 resistance is so small that it may be ignored.

6Ω

2Ω 4Ω

12V

A

3Ω

(a) (i) Determine the potential difference across the 2 Ω resistor.

potential difference = ...........................................................[1]

(ii) State the potential difference across the 3 Ω resistor. .................................................. [1]

(b) Calculate the effective resistance of

(i) the 2 Ω and 4 Ω resistors connected in series,

resistance = ...........................................................[1]

(ii) the 3 Ω and 6 Ω resistors connected in parallel.

resistance = ...........................................................[2] (c) Calculate the reading on the ammeter.

ammeter reading = ...........................................................[2]

(d) Without further calculation, state what happens, if anything, to the ammeter reading if

(i) the 2 Ω resistor is shorted out with a thick piece of wire,

...........................................................................................................................................

(ii) the thick piece of wire from (d)(i) and the 3 Ω resistor are both removed.

...........................................................................................................................................[2]

[Total: 9]

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

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6 MCQ SECTION: [Total Marks] The resistance of a cylindrical wire P is 80Ω. A second wire Q is made from the same material.

The cross-sectional area of Q is four times that of P. The length of Q is twice the length of P.

wire P wire Q

What is the resistance of Q?

A 10Ω B 40Ω C 160Ω D 640Ω

A lamp, designed to work at 1.5 V, is connected to a cell of electromotive force (e.m.f.) 1.5 V. The lamp lights at normal brightness.

The lamp is now connected to four similar cells, each of e.m.f. 1.5V, arranged in parallel.

What is the effect of connecting the extra cells in this way?

A The lamp burns out.

B The lamp is dimmer.

C The lamp produces light for a longer time.

D The lamp produces light for a shorter time.

What is an approximate value of the speed of sound in air under normal atmospheric conditions?

A 3 × 108 cm/ s

B 3 × 106 cm/ s

C 3 × 104 cm/ s

D 3 × 102 cm/ s Irtaz

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

5 A student uses a spring to demonstrate waves. He moves the spring with his hand.

spring placed on bench

Which diagram demonstrates the type of wave produced by a source of sound?

A B

C D

Two metal spheres X and Y are on insulating bases. Both spheres are negatively charged.

X

insulatingbase

–– –– –

– ––

Y–

– –– –

– ––

Sphere X is moved towards sphere Y until they almost touch.

Which diagram shows the final pattern of charges?

X Y

A

X Y

B

X Y

C

X Y

D

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Dedicated to My Son Mohammad Irtaza Zain. Code 5054

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The diagram shows an electric circuit containing three meters, X, Y and Z, all connected correctly.

X Z

Y

What are meters X, Y and Z?

X Y Z

A ammeter ammeter ammeter

B ammeter voltmeter ammeter

C voltmeter ammeter voltmeter

D voltmeter voltmeter voltmeter

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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

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