7/29/2019 Physics Test (Unit 13-16) II

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Test (Unit 13-16)

20 M

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urn over[T

heory Section:

T [Total arks]

Time Allowed: 35Minutes

Maximum Marks: 25

NIQUE SCIENCE ACADEMYU

Date

Name

Paper: Physics

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Dedicated to My Son Mohammad Irtaza Zain. Code 5054

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

.......[1]

A student wrote the following report about an experiment to measure the speed of sound inair.

My friend and I went into a field a long way from any buildings and measuredthe distance across the field. My friend stood at one side of the field and Istood at the other. My friend banged two pieces of wood together, and as Isaw him do this, I started a stopwatch. I stopped the stopwatch when I heardthe sound. We obtained the following readings.

distance across field = 238 mtime for sound to cross field = 0.7 s

(a) Why was it necessary to be a long way from any buildings?

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

(b) Why was it necessary to use such a large distance?

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

(c) Suggest what the students could have used to measure the distance across the field.

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

(d) Why was there a delay between the student seeing the pieces of wood come togetherand hearing the bang?

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

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

(e) Use the readings to calculate the speed of sound.

(f) Suggest why it might have been a good idea for the students to repeat the experimentafter they had exchanged positions.

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

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

[Total 7]

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[2]

On Fig. 2.1, show the path of the beam until it reaches the screen.

Fig. 2.1

Fig. 2.1.2 (a) A narrow beam of red light strikes one face of a triangular prism at A, as shown in

(i)

(ii) What name do we use to describe what happens to the beam at A?

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

A

red light

screen

Fig. 2.2

Fig. 2.2.(b) The red light is replaced by a narrow beam of mixed red and violet light, as shown in

red +violet light

screen

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Complete Fig. 2.2 to show what happens to the red and the violet light. [1]

On Fig. 2.2, mark with the letter X the place where infra-red radiation from the

(c) The beam of red and violet light is replaced by a narrow beam of white light from theSun. State what is now seen on the screen.

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

(d) The rays from the Sun also include infra-red rays. Infra-red radiation can pass throughglass.

(i)Sun might strike the screen after passing through the prism.

(ii) Why can infra-red not be seen on the screen?

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

(iii) What could be used to detect the infra-red radiation?

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

[Total 7]

Fig. 3.1

Fig. 3.1 shows how an image is formed by a converging lens.3

O F2 F1

I

24cm 10cm 8cm

(a) State the value of the focal length of the lens.

focal length = .......................................... cm [1]

(b) The object O is moved a small distance to the left.

State two things that happen to the image I.

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

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

[Total: 6]

On Fig. 3.1, draw the ray from the top of the object which passes through F

are marked on Fig. 3.1.

[2]

(c) Points F1 and F2

(i) State the name we give to these two points.

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

(ii) 2.

Continue your ray until it meets the image.

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

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5MCQ SECTION: [Total Marks]

A VHF radio station broadcasts at a frequency of 60 MHz (6.0 107 Hz). The speed of radio

waves is 3.0 108m/s.

What is the wavelength of the waves broadcast by the station?

A 5.0m B 2.0m C 0.5m D 0.2m

A ray of light passes into a glass block of refractive index 1.5.

X

60air

glass

What is the value of the angle marked X?

A 19.5 B 25.0 C 35.0 D 48.5

A girl writes the word LEFT on a piece of card.

LEFT

She looks at the image of this card, made by reflection by a plane mirror.What does she see?

A B C D

A student holds a sheet of paper with letters on it facing a plane mirror.

The letters on the paper are shown.

What does the student see in the mirror?

A B C D

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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

The diagrams represent two different sound waves.

wave P wave Q

time time

displacement displacement

How do the frequency and pitch of P compare with the frequency and pitch of Q?

frequency of P pitch of P

A greater than Q higher than Q

B greater than Q same as Q

C same as Q higher than Q

Dsame as Q same as Q