adabistan-e-soophiaphysics o –level –ii page 5 of 13 11 four different whistles, when blown,...

Physics O – Level – II of 13

Adabistan-e-SoophiaAdabistan-e-SoophiaSchool for Boys & Girls

CANDIDATENAME

CENTERNUMBER

CANDIDATENUMBER

PHYISCS 5054

Session

Time

2 0 2 0 - 2 1

9 0 m i n u t e s

Marks 6 0Candidates answer on the enclosed Answer Booklet

Additional Materials: Answer Booklet/Paper

Paper I: Multiple choices:

1. There are twenty questions on this paper. Answer all questions. For each question

there are four possible answers A, B, C and D.

2. Choose the one you consider correct and record your choice in soft pencil on the separateAnswer Sheet.

Paper II:

1. Answer all questions.

2. Write an answer in the spaces provided on the question paper.

3. The number of marks is given in brackets [ ] at the end of each question on part question.

For Examiner’s Use

Paper – I

1

Paper – II

1

2

3

[TURN OVER]

This document consists of 13 printed pages.

Total

4

General Certificate of Education Ordinary Level – II (2nd

Term Examination)

Paper – I

of 13Physics O – Level – II

1 The speeds of sound in air, in steel and in water are different.

Which of the following gives the speeds in increasing order?

2 A sound wave from a violin has a larger amplitude than that from a flute. The sound wave from theflute has a higher frequency than that from the violin.

Which instrument produces the louder sound and which produces the sound of higher pitch?

3 Three bars of metal are known to be brass, iron and steel. A magnet is placed at one end of eachmetal bar.

The diagrams show how many tacks are picked up by each metal bar.

What are metals 1, 2 and 3?

N

S

metal1

N

S

metal2

N

S

metal3

tacks

louder sound higher pitch

A flute flute

B flute violin

C violin flute

D violin violin

metal 1 metal 2 metal 3

A iron brass steel

B iron steel brass

C steel brass iron

D steel iron brass

slowest → fastest

A air water steel

B steel water air

C water air steel

D water steel air


4 A sound wave travels through air. The lines in the diagram show the positions of particles of air at one particular time.

Which distance is the wavelength of the wave?

A B C D

5 What material can a temporary magnet be made from?

A plastic

B soft iron

C steel

D wood

6 The diagram shows an uncharged ball covered with metallic paint. The ball is suspended from an insulating thread. It is placed near a positively charged rod.

ball coveredwith metallicpaint

insulating thread

++++++

positivelycharged rod

Which diagram shows the charge distribution on the ball?

––––++++

D

––––

C

–––– ++++

++++

BA

7 Which of the following is the most effective way to demagnetise a magnetised steel needle?

A Drop it on the floor.

B Leave it inside a solenoid carrying direct current.

C Leave it next to another strong magnet.

D Slowly pull it out of a solenoid carrying alternating current.


10 When a narrow beam of white light passes through a prism, it produces a spectrum.

Which diagram correctly shows the refraction and dispersion produced by the prism?

A

C

B

VR

V

VR

R

VR

D

keyV = violetR = red

9 A piece of thin card is held against the teeth of a cog wheel.

When the wheel is turned at high speed, a note is heard.

How can the pitch of the note be raised?

A by pressing the card against the teeth with a greater force

B by turning the wheel more quickly

C by using a thicker card

D by using a wheel with fewer teeth

�cog wheel

thin card in clamp

8 A length of copper wire, coiled around a core, is used as an electromagnet.

Which combination produces the strongest electromagnet?

number of turns core

A few soft-iron

B few steel

C many copper

D many soft-iron


11 Four different whistles, when blown, emit pure notes with the frequencies shown.

0.1 kHz 1 kHz 10 kHz 100 kHz

How many of the frequencies are above the normal audible range for humans?

A 1 B 2 C 3 D 4

12 An iron bar is placed near a magnet as shown.

Which diagram correctly shows the induced magnetisation of the iron bar?

13 A small compass is placed beside the middle of a bar magnet.

In which direction will the compass needle point?

A B C D

compass

S N

N

S N

N S S N

S

A B C D

N S

magnet

iron bar

14 X-rays, visible light and radio waves are all part of the electromagnetic spectrum.

What is the correct order of increasing wavelength?

shortest → longest

A radio waves X-rays visible light

B radio waves visible light X-rays

C X-rays radio waves visible light

D X-rays visible light radio waves


15 A piece of steel can be magnetised by stroking it with a magnet.

When the magnet is moved in the direction shown, which poles are produced at X and at Y?

steelX Y

magnetN

X Y

A north north

B north south

C south north

D south south

16 Which diagram shows the electric field pattern between two charged spheres?

+ –

+ –

+ –

+ –

A

B

C

D


20 Four different substances are tested by using each as the core of an electromagnet to find themost suitable one for use as the core of a transformer.

The number of paper clips each will hold is recorded when there is a current in the electromagnetand when the current is switched off.

Which substance will be the best for making a core for a transformer?

paper clips

core

number of paper clips number of paper clips heldsubstance held with a current when current is switched off

A 8 4

B 6 0

C 5 1

D 4 0

18 The answer to which question will distinguish between a magnetic material and a non-magneticmaterial?

A Is it a metal or a non-metal?

B Is it a conductor or an insulator?

C Can it be given an electric charge?

D Does it affect the direction in which a compass needle points?

19 An electrostatically charged object will pick up small pieces of paper.

Which of the following will not pick up pieces of paper?

A an earthed metal rod rubbed with a duster

B a plastic comb pulled through dry hair

C a polythene rod rubbed with a woollen cloth

D a rubber balloon rubbed on a nylon shirt

17 A sonic ‘tape measure’ is used to measure the length of a room. It measures a time interval of0.060 s between transmitting a sound pulse and receiving the echo. The speed of sound in air is330 m/s.

How far is the reflecting wall from the ‘tape measure’?

A 5.5 m B 9.9 m C 11 m D 20 m


Answer all the questions in this section. Answer in the spaces provided.

Paper – II

1 The chart in Fig. 1.1 shows the main parts of the electromagnetic spectrum.

Fig. 1.1

(a) All of the different types of electromagnetic waves in the chart may be reflected.

State three other properties common to all electromagnetic waves.

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

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

3. ................................................................................................................................ [3]

(b) Microwaves travel at a speed of 3.0 x 108 m/s in a vacuum and have a frequency of1.5 x 1010 Hz.

(i) Calculate the wavelength of these microwaves.

wavelength = .....................................................

(ii) On the chart in Fig. 1.1, mark a line to represent the position of these microwavesin the electromagnetic spectrum.

[3]

10–9 m10–12 m 10–6 m 10–3m 1m 1000 m

gamma rays X-rays ultra-violet infra-red radio

wavelength

visible


(c) (i) When white light passes through a prism, dispersion of the light occurs and aspectrum is formed. Explain what is meant by the dispersion of light.

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

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

(ii) Fig. 1.2 shows a ray of white light incident at 90° to side A of a glass prism.

Fig. 1.2

Draw rays to show the passage of the light through the prism and out of the prismat side B. [2]

whitelight

sideA

sideB

2 Fig. 2.1 shows an experiment in which a bell rings inside a glass jar.

Fig. 2.1

Sound is heard outside the jar.

(a) (i) Explain how sound is transmitted by the molecules of the air and the jar.

to vacuum pump

glass jar

air

bell

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

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

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

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

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

[2]

[Total: 10]


(ii) State and explain what is heard outside the jar as the air is removed from the jar.

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

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

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

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

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

(b) To investigate a layer of rock underground, an explosion is made on the surface of the Earth.Fig. 2.2 shows the arrangement.

Fig. 2.2

Sound from the explosion may travel to the detector through air (path 1), through earth (path 2),or by reflection from a layer of rock (path 3). Some sound travels into the layer of rock bypath 4.

detectorexplosion made here

surfaceair

earth

layer of rock

1

2

3

4

5

The time taken for the sound to reach the detector is shown in the table.

(i) Explain why sound arrives first at the detector along path 2.

path 1 path 2 path 3

0.100 0.020 0.300time taken for sound to travel from source to detector / s

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

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

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

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

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

(ii) Given that the speed of sound in air is 320 m/s, calculate the distance between thesource of sound and the detector.

[3]

(iii) Use your answer to (ii) to calculate the speed of sound in earth.

speed of sound = .....................................................[2]

(c) Describe a method for measuring the speed of sound in air. In your account, state clearly

• how the sound is made, • what measurements are taken,

• how the result is calculated, • one precaution to produce an accurate result.

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

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

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

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

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

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

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

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

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

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

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

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

....................................................................................................................................................[4]

distance = .....................................................

[Total: 15]


(c) Describe two method of magnetising a steel rod.

(d) How would you check that the steel rod had been magnetised?

[4]

what would show that the steelwhat I would do rod had been magnetised

[Total: 10]

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

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

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

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

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

3 (a) An iron rod is placed next to a bar magnet, as shown in Fig. 3.1.

N S

iron rodFig. 3.1

(i) On Fig. 3.1, mark clearly the north pole and the south pole that are induced in the iron rod.

(ii) What happens to the magnet and the rod? Tick one box.

nothing

they attract

they repel

(b) A second bar magnet is now placed next to the iron rod, as shown in Fig. 3.2.

N S

iron rod

N S

Fig. 3.2

(i) On Fig. 3.2, mark clearly the magnetic poles induced in the iron rod. (ii) What happens to the iron rod and the second magnet? Tick one box.

nothing

they attract

they repel [1]

[1]

[1]

[1]


4 Two vertical metal plates are connected to a high voltage power supply, as shown inFig. 4.1. An electric field exists in the space between the plates.

Fig. 4.1

(a) (i) State what is meant by the electric field between the plates.

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

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

(ii) On Fig. 4.1, draw lines of force to show the electric field between the two plates.[3]

(b) An uncharged metal ball is hung by an insulating thread between the two plates, asshown in Fig. 4.2.

Fig. 4.2

On Fig. 4.2,

(i) draw the distribution of charge that will be found on the metal ball,

(ii) draw lines of force to show the new electric field between the plates.[2]

+ –

power supply

+ –

power supply

plate plate

[Total: 5]


1.A B C D

2.A B C D

3.A B C D

4.A B C D

5.A B C D

6.A B C D

7.A B C D

8.A B C D

9.A B C D

10.A B C D

11.A B C D

12.A B C D

13.A B C D

14.A B C D

15.A B C D

16.A B C D

17.A B C D

18.A B C D

19.A B C D

20.A B C D

adabistan-e-soophiaphysics o –level –ii page 5 of 13 11 four different whistles, when blown,...

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