Kulleġġ San Benedittu Secondary School Kirkop. Physics Year 10 Track 2 Page 1 of 12

Mark

KULLEĠĠ SAN BENEDITTU

Secondary School, Kirkop

HALF YEARLY EXAMINATION – 2017/18

Track 2

YEAR 10 Physics TIME: 1hr 30min

Name: ____________________________ Class: ___________

Answer ALL questions in Section A and Section B.

All working must be shown. The use of a calculator is allowed.

Where necessary take the acceleration due to gravity as g =10m/s2.

Forces And

Motion

W = mg

F = ma

v = u + at

s = ut + ½ at2

s = (u+v)

2 t

v2 = u2+2as

Average velocity = total distance

total time

Area of trapezium =1

2(a + b) h

Waves

v = f f =

1

𝑇

η =speed of light in air

speed of light in medium η =

real depth

apparent depth

m =height of image

height of object m =

distance of image

distance of object

FOR EXAMINER’S USE:

Number 1 2 3 4 5 6 7 8 Total

Max. Mark 8 8 8 8 8 15 15 15 85

Actual Mark

Total Theory Total Practical Final Mark

Maximum Mark 85 15 100

Actual Mark

Kulleġġ San Benedittu Secondary School Kirkop. Physics Year 10 Track 2 Page 2 of 12

SECTION A [This section carries 40 marks]

____________________________________________________________________

1. This question is about WAVES.

Look carefully at the displacement-time graph and fill in the blanks below.

a. The wave is a transverse wave with an amplitude of __________cm. The diagram

shows _______ crests. [2]

b. What is the periodic time of this wave?

__________________________________________________________________ [1]

c. Calculate the frequency of this wave.

____________________________________________________________________

__________________________________________________________________ [2]

d. The wavelength of the waves is 8m. Calculate the velocity of the waves.

____________________________________________________________________

__________________________________________________________________ [2]

e. On the same diagram, draw another wave having the same wavelength but a

smaller amplitude. [1]

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2. This question is about the electromagnetic

spectrum

Nicole and James were listening to a radio. Radio

waves are part of the electromagnetic spectrum.

a. All the waves of the electromagnetic spectrum are __________________ waves. [1]

b. Which of the electromagnetic waves:

i. Has the longest wavelength ___________________ [1]

ii. Is used to detect bone fractures ___________________ [1]

iii. Can be most harmful to humans ___________________ [1]

c. Suggest two properties common to all the waves that make up the electromagnetic

spectrum.

____________________________________________________________________

__________________________________________________________________[2]

d. A radio station transmits waves at a frequency of 95,000,000Hz.

Calculate the wavelength of these radio waves in metres given that their velocity is

3x108 m/s.

____________________________________________________________________

__________________________________________________________________[2]

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3. This question is about LIGHT and REFLECTION

Bobby is a sausage dog. The diagram below shows how Bobby sees the image of a

bone in a mirror.

a. On the diagram above draw:

i. the incident ray [1]

ii. the position of the actual bone (object). Mark it with an O. [1]

b. On the diagram mark the angle of reflection r. [2]

c. Underline the correct words.

i. The image of the bone appears (bigger than , the same size as , smaller than) the

actual bone. [1]

ii. The image in the mirror is (real , diminished , virtual). [1]

d. State the law of reflection.

____________________________________________________________________

__________________________________________________________________[2]

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4. This question is about LIGHT and REFRACTION

Joanne went fishing at Wied iż-Żurrieq. While looking at the sea,

she saw a fish. The diagram below shows how rays of light travel

in this situation.

a. Use your diagram to include:

i. two virtual rays. [1]

ii. the position of the image. Mark this position as ‘I’. [1]

b. Underline the correct words: As light travels from water to air

(reflection, refraction, diffraction) takes place. This makes the fish appear at (a greater,

the same, a lower) depth. [2]

c. Use the words ‘increases’, ‘decreases’ or ‘remains the same’ to describe what

happens to light rays as these travel from water to air.

Speed of light ___________________________

Frequency ___________________________ [2]

d. The fish is at a depth of 50 cm. Given that the refractive index of water is 1.33,

calculate the depth at which the fish appears to be. Give your answer in metres.

____________________________________________________________________

__________________________________________________________________[2]

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5. This question is about LENSES.

The diagram shows a lens in a projector.

a. Draw two rays on the diagram to show how the image is produced. [3]

b. Is this image:

i. Magnified or diminished? ________________________ [1]

ii. Upright or inverted? ________________________ [1]

c. Calculate the magnification of the lens.

____________________________________________________________________

____________________________________________________________________

__________________________________________________________________[2]

d. Describe one change which occur to the image when the object is between the lens

and the focal point.

__________________________________________________________________[1]

Object

F F

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SECTION B [This section carries 45 marks] ________________________________________________________________________________

6. This question is about MOTION.

Robert uses his scooter to travel from home to work.

a. The table shows how the velocity of the scooter changes with time.

Velocity (m/s) 0 3 6 9 12 15 18 21 21

Time (s) 0 2 4 6 8 10 12 14 16

i. On the graph paper provided, draw a graph of velocity on the y-axis against time

on the x-axis to represent Robert’s journey with his scooter. [4]

ii. Using the equation a = 𝒗−𝒖

𝒕, find the acceleration of Robert’s scooter in the first

14 seconds.

____________________________________________________________________

__________________________________________________________________[2]

iii. Underline the correct words: The area under the graph represents (the velocity,

the distance, the deceleration). [1]

iv. Calculate the distance the scooter moved while travelling at constant speed.

____________________________________________________________________

__________________________________________________________________[2]

b. After 16 seconds, Robert sees the red traffic lights which are 55m away.

This table gives information about the thinking and braking distances of the scooter.

Velocity m/s Thinking distance /m Braking distance /m

21 14 35

i. Use the information in the table and the equation 𝒗 =𝒔

𝒕 to calculate Robert’s

thinking time.

____________________________________________________________________

__________________________________________________________________[1]

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__________________________________________________

_________ _______________________

_______________________

0

2

4

6

8

10

12

14

16

18

20

22

24

0 2 4 6 8 10 12 14 16

Kulleġġ San Benedittu Secondary School Kirkop. Physics Year 10 Track 2 Page 9 of 12

ii. Calculate the total stopping distance of the scooter when travelling at 21m/s.

__________________________________________________________________[1]

iii. Did Robert manage to stop before the traffic lights? Explain.

__________________________________________________________________[2]

iv. Underline the correct words:

On a different occasion, Robert is very tired and he is going to press the brakes. The

thinking distance (increases, decreases, remains the same) while the braking distance

(increases, decreases, remains the same). [2]

7. This question is about SOUND WAVES.

A technique called ultrasonic cleaning is often used to get rid of

the dust, dirt, oils, and other particles attached to small objects.

Inside the cleaner, water molecules are made to vibrate rapidly

and the objects are cleaned.

a. i. Fill in the blanks:

Ultrasounds are sounds that have a frequency higher than_______________ Hz. [1]

ii. Are these waves in the audible (hearing) range of human beings? Explain.

____________________________________________________________________

__________________________________________________________________[2]

iii. Are ultrasounds transverse or longitudinal waves? _____________________[1]

iv. If the frequency of the ultrasound is 30,000Hz and the speed of sound in water is

1500m/s, calculate the wavelength of the wave.

____________________________________________________________________

____________________________________________________________________

__________________________________________________________________[3]

Kulleġġ San Benedittu Secondary School Kirkop. Physics Year 10 Track 2 Page 10 of 12

b. Keith and Sue set up the following apparatus to measure the speed of sound in air.

i. Write numbers from 1 to 5 to show the correct order required to carry out the

experiment. [5]

Ring the bell in front of microphone A.

Note the time recorded from the data logger and take repeated

readings.

Set the two microphones away from each other and measure the

distance between them.

Use the measurements obtained to calculate the speed of sound.

Connect the microphones to the data logger and launch the software.

ii. The two microphones are 3.4m apart and the data logger recorded a time of 0.01s

for the sound to travel between the microphones. Calculate the speed of sound in air.

____________________________________________________________________

____________________________________________________________________

__________________________________________________________________[2]

iii. Mention one precaution taken during the experiment.

__________________________________________________________________[1]

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8. This question is about the PROPERTIES OF WAVES.

The diagram represents wave crests in a ripple tank. The wave crests travel from deep

water towards a straight boundary where the water becomes shallow.

a. Underline the correct words:

i. A (spherical dipper, data logger, horizontal bar) is used to produce straight waves.[1]

ii. Water waves are transverse waves. In a transverse wave particles move at

(90o, 45o, 180o) with the wave motion. (Light, Sound, Motion) waves are also

transverse. [2]

b. i. Complete the diagram above to show what happens to water waves in the

shallow section. [2]

ii. Underline the correct words: As water waves pass over the shallow part, the

wave velocity (decreases, remains the same, increases) and frequency of the waves

(decreases, remains the same, increases). [2]

iii. Use the equation 𝑣 = 𝑓 × 𝜆 to calculate the velocity of the waves if these waves

have a wavelength of 0.05m and a frequency of 20Hz.

____________________________________________________________________

__________________________________________________________________[2]

Kulleġġ San Benedittu Secondary School Kirkop. Physics Year 10 Track 2 Page 12 of 12

c. During diffraction, wave crests pass through a gap.

i. Complete the diagrams above to show what happens to the wave crests as these

pass through the two gaps. [4]

ii.Underline the correct words: Diffraction depends on the

(wavelength, amplitude, timing) of the waves. During diffraction, the velocity of the

waves (increases, remains the same, decreases). [2]

END OF PAPER