National 5 Physics Prelim

January 2016

Time 2 Hours

Read Carefully

Reference may be made to the accompanying Physics Data sheet and the Relationshipssheet.

Section 1 (questions 1 to 20) All questions should be attempted. There is only one correct answer to each question- Write answers on the lined paper

provided. Under the heading Section 1

Section 2 (questions 1 to 10) Answer the questions numbered 1-10 on the lined paper provided. Under the heading Section 2

All answers must be written clearly and legibly in ink. Diagrams and graphs should be drawn in pencil. Fill in your name, class and teacher clearly on the front page and put your name on each page.

Care should be taken to give an appropriate number of significant figures in the final answers to calculations.

PLEASE MARK ALL MULTIPLE CHOICE ANSWERS ON YOUR LINED PAPER

SECTION 1

1. A sling shot, holding a stone of mass 0·03 kg is extended a distance of 0·2 m.

A force of 5 N is required to hold it still.

When the sling shot is released, the stone will leave it with a velocity of

A 0·06 ms-1

B 1·00 ms-1

C 8·16 ms-1

D 66·67 ms-1

E 166·67 ms-1

2. A radio station has a wavelength of 290 m. The frequency of the radio signal is

A 0∙97 μHz

B 1∙17 Hz

C 98∙6 kHz

D 1∙03 MHz

E 87 000 MHz

3. A student makes the following statements about specific heat capacity.

I specific heat capacity is the energy required to raise the temperature of 1 kg of a

substance by 1 oC

II specific heat capacity depends on the mass of the substance.

III the unit for specific heat capacity is the J-1oC

Which of the statements is/ are correct?

A I only

B III only

C I and II only

D II and III

E I, II and III

4. Energy is measured in

A amperes

B coulombs

C joules

D metres per second

E watts

5. A student made the following statements about gases

I The pressure of a fixed mass of gas varies directly with its Kelvin temperature, provided the volume of gas remains constant.

II The pressure of a fixed mass of gas varies inversely with its volume, provided the temperature of the gas remains constant.

III A temperature change of 1 C in a gas is the same as a temperature change ⁰of 1 K.

Which of the statements is/are correct?

A I only

B II only

C III only

D I and II only

E I, II and III

6. A trolley of mass 1∙2 kg travels along a level track at 2 ms-1.

The kinetic energy of the trolley is

A 1∙20 J

B 1∙44 J

C 2∙40 J

D 2∙88 J

E 4∙80 J

7. Equivalent dose is measured in

A Becquerels

B Grays

C Joules

D Pascals

E Sieverts

1 2∙ kg

8. A student makes the following statements about waves.

I Waves transfer energy.

II When waves reflect off of a surface the angle of incidence is greater than the angle of reflection.

III Waves of long wavelengths diffract more than waves of short wavelength.

Which of the statements is/ are correct?

A I only

B III only

C I and II only

D I and III

E I, II and III

9. The total work done moving two 12 kg boxes 3m at constant speed along a frictionless floor is:

A 0 J

B 4 J

C 8 J

D 36 J

E 72 J

10. The diagram below shows light travelling from air into a glass block.

Which row in the table identifies the angles of incidence and refraction?

Cglass

air

D

B

ray of light

C

A

11. Gamma radiation can be absorbed by

A a few centimetres of air

B a few millimetres of paper

C a few centimetres of paper

D a few millimetres of aluminium

E several metres of concrete

12. A 0∙75 kg sample of tissue is exposed to 15 mJ of radiation for 3 minutes.

The absorbed dose for this radiation is

A 0∙01 Gy

B 0∙02 Gy

C 0∙06 Gy

D 3∙6 Gy

E 20∙0 Gy

Angle of incidence Angle of refraction

A A C

B B C

C A D

D B D

E D A

13. A radioactive source is monitored; it is found that 12 000 nuclei decay every two

minutes.

The activity of the radioactive source is

A 100 Bq

B 100 kBq

C 6000 Bq

D 24 kBq

E 1440 kBq

14. Which of the following are both vector quantities?

A displacement and velocity

B speed and acceleration

C time and force

D momentum and speed

E energy and power

15. A boy runs 3 km due North. He then runs 4 km East. The total journey takes

1 hour.

His velocity is

A 5 kmhr-1 (037)

B 5 kmhr-1 (053)

C 5 kmhr-1 (307)

D 7 kmhr-1 (037)

E 7 kmhr-1 (053)

16. A car of mass 450 kg travels along a road with an acceleration of 1∙5 ms-2. The friction

force acting on the car is 200 N.

The engine force is

A 200 N

B 300 N

C 475 N

D 675 N

E 875 N

17. Which of the following rows correctly list the sections of the electromagnetic spectrum in order of increasing frequency?

A radio waves, visible light, gamma rays

B gamma rays, visible light, radio waves

C radio waves, gamma rays, visible light

D visible light, radio waves, gamma rays

E gamma rays, radio waves, visible light

18. A signal is received using a curved reflector as shown.

curved reflector

engine force frictional force

Which of the following statements is/ are correct?

I The receiver is placed at the focus of the reflector.

II At the surface of the curved reflector, the angle of incidence of the signal is

equal to the angle of reflection.

III Curved reflections are regularly used in the construction of communications

satellites.

A I only

B III only

C I and II only

D II and III

E I, II and III

19.

The graph shows the velocity of a car on a road.

The acceleration of the car is:

A 0·5 ms-2

B 0·6 ms-2

C 0·9 ms-2

D 1·0 ms-2

E 1·1 ms-2

20. The energy required to raise the temperature of 0∙8 kg of water from 22 oC to 74

oC is

A 4 180 J

B 173 888 J

C 267 200 J

D 334 000 J

E 1 808 000 J

15

V (ms-1)

t (s)24

27

SECTION 2[PLEASE ANSWER ALL QUESTIONS IN FULL WITH WORKING ON THE LINED PAPER PROVIDED]

1. A diver of mass of 60 kg jumps from a 3 m high diving board into the swimming pool below

(a) Calculate the potential energy of the diver when standing on the diving board. 3

(b) State the kinetic energy of the diver just before he hits the water. 1

(c) Calculate the velocity of the diver just before he hits the water. 3

(d) Explain why the actual velocity will be less that the value calculated in part (c). 1

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2. In 1933 naval officers on board USS Ramapo measured a wave with a vertical distance of 34 m from the crest to the trough. The period of the wave was timed to be 20 s and its wavelength measured to be 342 m.

(a) i) Calculate the amplitude of the wave 1

ii) Calculate the frequency of the wave 3

(b) Calculate the wave speed. 3

(c) Oceanographers can calculate ocean depths by sending pulses of ultrasound waves towardsthe ocean floor and measuring the time taken for the reflection to be received.

Calculate the ocean depth if the pulse is received back after 08 seconds. 3

(d) State what would happen to this time if a school of fish passed underneath the boat. 1

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3. A student is interested in car racing and studies the following data recorded for tyre

pressure and temperature.

a)

a) Using all of the data, establish the relationship between pressure and the

temperature of the gas. 3

b) Using the kinetic theory of gases, explain the increase in pressure of

the gas. 3

c) Using your knowledge of physics explain how the temperature and inflation of

a tyre can affect a cars performance. 3

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Pressure/

Pa2·56 x 10 5 2·58 x 10 5 2·60 x 10 5

Temperature/

�̊ C

22 24 26

4. Sound waves are produced by a tuning fork. The sound waves have a frequency

of 262 Hz and travel at 340 ms-1.

(a) How far do they travel in 6 s? 3

(b) Calculate the wavelength of the sound waves. 3

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5. A football is kicked horizontally off a cliff with a velocity of 35 ms-1.

(a) Copy the diagram and sketch the path the ball will take. 1

(b) Calculate the range of the ball if it lands 4 s later. 3

(c) Calculate the vertical velocity of the ball the moment before it hits the ground. 3

(d) Copy and complete the velocity–time graphs below for the horizontal and verticalcomponents of the ball’s velocity.

You should include numerical values where appropriate. 4

horizontal component vertical component

(e) Calculate the height of the cliff. 3

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VH (m

s-1)

t (s)

t (s)

VV (m

s-1)

6. The radiations of the electromagnetic spectrum are shown below.

(a) Name radiations:

(i) X 1

(ii) Y 1

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7. A radiation worker is carrying out investigations. She must record the level of

background radiation before she begins.

(a) State 2 sources of background radiation. 2

(b) The worker exposes a tissue sample of mass 1·2 kg to 200 μGy of fast neutrons of weighting factor 20 over a 10 minute period.

Calculate the energy absorbed by the tissue sample. 3

(c) Calculate the equivalent dose rate. 4

In the course of her work, the radiation worker is also exposed to radiation.

YX rayUltra violet

Visible light

Infra redXRadio & TV

(d) Describe a method used to monitor the amount of radiation she is exposed to. 2

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8. An elevator of mass 400kg is travelling upwards. A velocity time graph of its motion is shown.

(a) Use the graph to find the vertical distance travelled by the lift. 3

(b) Calculate the work done in raising the elevator. 4

8

2

0

velocity/ ms-1

time/ s

The elevator then descends at a constant velocity.

(c) Using one of Newton’s laws, state and explain the forces acting on the elevator. 2

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9. The graph below shows how the speed of a cyclist changes with time.

a)

(i) Describe the motion of the cyclist between points 0 and C. 3

(ii) Calculate the acceleration of the cyclist between points O and A. 3

(iii) Calculate the total displacement of the cyclist. 4

During part of the journey the cyclist is travelling at a constant velocity.

b) Describe the forces acting on the cyclist at this time. 1

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C

BA

20181614

time/ s

Velocity/ms-1

0

0·25

0·50

12108642

10.

In 2030 NASA are planning to send a manned mission to Mars.

(a) Using your knowledge of physics, explain some of the challenges and risks that thismission will present to the scientists and astronauts. 3

(b)

On re-entering the Earth’s atmosphere, a space shuttle experiences a huge amount of friction. To prevent excessive heating inside the space shuttle it is coated with tiles which have a large specific heat capacity.

(c)

Explain how this protects the shuttle and crew. 3

(d) If the total mass of protective tiles on the shuttle is 2500 kg and the temperature rise is 180 000 oC. The tiles absorb 28 x 1012J of heat energy.

Calculate the value of specific heat capacity of the tiles. 3

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