Csec Physics January 2018 P2 (1).docx

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FORM TP 2018022

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JANUARY 20I8

CARIBBEAN EXAMINATIONS COUNCIL CARIBBEAN SECONDARY EDUCATION CERTIFICATE@ EXAMINATION PHYSICS Paper 02 - General Proficiency 2 hours 30 minutes

READ THE FOLLOWING INSTRUCTIONS CAREFULLY.

l.

This paper consists of two sections: A and B.

2

Section A consists of THREE questions. Candidates must attempt ALL questions in this section.

J

Section B consists of THREE questions. Candidates must attemptALL questions in this section.

4.

All answers MUST be written in this answer booklet

5

Do NOT write in the margins

6

All working MUST be clearly shown.

7

You may use a silent, non-programmable calculator, but you should note that the use of an inappropriate number of figures in answers will be penalized.

8.

Mathematical tables are provided.

9.

If you

need to rewrite any answer and there is not enough space to do so on the original page, you must use the extra lined page(s) provided at the back ofthis booklet. Remember to draw a line through your original answer.

10. If you use the extra page(s) you MUST write the question number clearly in the box provided at the top of the extra page(s) and, where relevant, include the question part beside the answer.

DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO. Copyright @ 2017 Caribbean Examinations Council All rights reserved. I

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4 SECTION A

AnswerALL questions. You MUST write your answers in this answer booklet.

1.

(a)

A student conducted an experiment on light travelling from glass to air. Figure I is a diagram showing light travelling from glass to air. The results of the experiment are recorded in Table 1. N

r Air

Figure 1. Light travelling from glass to air

TABLE 1 /\

Angle ofRefraction, r

Angle of Incidence, i

10.0

6.5

30.0

19.0

50.0

30.0

70.0

38.0

90.0

4l.0

srn

r

srn

i

nn

(i) (iD

i.

Complete Table I by calculating the values of sin r and sin

(5 marks)

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Using the calculated values in Thble l, plot a graph of sin f against sin i on the

grid on page 5.

(8 marks)

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(iii)

Calculate the gradient of the graph.

(4 marks)

(b)

State the name of the physical property represented by the gradient in

(a) (iii)

(1 mark)

(c)

(i)

Explain the term 'criticalangle'

(2 marks)

(ii)

Using Table l, or otherwise, state the critical angle for the glass used in

(a).

(1 mark)

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(d)

Figure 2 shows light travelling in the core of a fibre optic cable as it reflects offthe cladding.

Core

Cladding

Figure 2.Light travelling in the core of the fibre optic cable

If the refractive index from the cladding to the core is 1.03, calculate the critical angle in the core.

(4 marks)

Total25 marks

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2.

(a)

Complete Table2 to distinguish among solids, liquids and gases using the terms 'definite/ fixed','vibrate','movefreely','veryweak/negligibly weak','nofixed shape'.

TABLE 2 Movement of Molecules

Volume

Shape

Definite/fixed

Solid

Liquid

Intermolecular Forces Strong

Takes shape of

Move amongst

container

one another

Full space

Gas

(7 marks)

(b)

Students in a fifth form Physics class used the apparatus in Figures 3a and 3b in an experiment to find the specific latent heat of vaporization of water, /,.

Figure 3a shows the initial readings as the water begins to boil and Figure 3b shows readings taken after 5 minutes and 45 seconds.

Mains of

Meins of electric

elecHc Boiling weter

Ssillng weter electric heeter

elecHc heater. Mass

fimer

(9

timer

3T5s Start

OStop

fimer

Balance

00:05:{5.00

FI

@ Start

O Stop

Figure 3a. Initial Readings

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Mass

fimer

360s E Balance

Figure 3b. Readings after 5 minutes and 45 seconds

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(i)

(ii)

Convert the time recorded in Figure 3b to seconds.

Calculate the mass of water evaporated in the experiment.

(3 marks) (c)

The power of the electric heater used in the experiment was 100 W. Assuming no heat was lost to the surroundings, calculate the specific latent heat of vaporization of water, /,.

(5 marks)

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(a)

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Define the term 'energy'and state its SI unit.

(2 marks)

(b)

(i)

Complete Table 3 to show the MAIN form of energy associated with EACH of the following examples.

TABLE 3 Forms of Energy

Example Radioactive decay Radio waves, X-rays Objects in motion

(3 marks)

(ii)

State the MAIN energy conversions taking place when a flashlight is turned on.

(2 marks)

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Figure 4 shows a pendulum of mass 0.5 kg oscillating in a vacuum. X is the lowest position of the pendulum, where its maximum speed is 1.8 ms-'.

String

Y

_-a'

h

Figure 4. Simple pendulum

(i)

Calculate the maximum kinetic energy of the pendutum

(3 marks)

(ii)

Use

the

principle

of conservation of energy to find the maximum gravitational potential

energy of the pendulum.

(2 marks)

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(iii)

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Calculate the greatest height, h.

(3 marks)

Total 15 marks

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AnswerALL questions. You MUST write your answers in this answer booklet.

4.

(a)

The 201 I Fukushima nuclear disaster raised questions about the wisdom of utilizing nuclear

power. State TWO arguments for and TWO arguments against the use of nuclear fission reactors.

Arguments for

2.

Arguments against

2

(4 marks) (b)

Nuclear fusion is seen as the great energy hope of the future. State TWO advantages of nuclear fusion over nuclear fission.

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Correctly complete the following nuclear fusion reaction.

H

(3 marks)

(d)

A commonly used fusion reaction is 2

H+

3

I

I

4

H

He +

----> 2

I

n.

0

The mass of the reactants and products for this reaction are recorded in Table 4 below

TABLE 4 Nuclide

Mass/u 2.01410178

2

I H 3

I

4

,)

3.01604927

H

He

4.0026032s

lo"

1.00866492

u = 1.66 x 10-27 kg

c=3.0xlOtms-l

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Using the information in Table 4, calculate the energy released in this reaction.

(6 marks)

Total 15 marks

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Newton and Huygens were two of the scientists who made significant contributions to the modern view of light as embracing both a wave and particle nature. State what evidence each proposed and whether this evidence supported the wave theory or particle theory. Newton

Huygens..

(4 marks)

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(b)

A homemade projector is constructed from a cardboard box, a cellphone, a cellphone stand to hold the phone upright and a magnifying glass embedded into one face of the box, as shown in Figure 5. The focal length of the lens is 15.0 cm.

glass

Screen

Figure 5. A diagram of a homemade projector

(i)

Suggest, with a reason, an appropriate distance from the lens at which the phone should be placed in order to get a magnified image on an external screen.

(2 marks)

(ii)

If the phone is placed 20 cm from the lens, calculate the distance the screen must be placed from the lens in order to obtain a clear image of the phone.

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(iii)

Calculate the magnification of the image on the external screen formed in (b) (ii)

(3 marks)

(iv)

x

Ifthe dimensions ofthe phone screen are I I .0 cm 6.0 cm, calculate the dimensions of the image of the phone screen on the external screen.

(l mark)

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(v)

State whether the image formed in (b) (ii) is upright or inverted

(1 mark)

(vi)

Suggest one way in which the image formed in (b) (ii) can be made larger.

(1 mark)

Total 15 marks

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(a)

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Figure 6 shows the magnetic field between the poles of a strong magnet.

Figure 6. Magnetic field between the poles of a strong magnet

Complete the following diagrams to show

(i)

the magnetic field due to a current carrying conductor where the current

is

directed

into the plane of the paper

@

(2 marks)

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(ii)

the resulting magnetic field when the current carrying conductor in (a) (i) is placed

between the poles of the magnet, as shown in Figure 6.

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(3 marks)

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(b)

Figure 7 shows the end view of a simple d.c. motor.

x

Figure 7. Diagram of a simple d.c. motor

(i)

Name the part labelled X

(1 mark)

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(ii)

Explain what happens when the switch is closed. Your answer should include the direction of the current, the forces acting, any rules applied, the direction of rotation and how continuous rotation is achieved.

(9 marks)

Total 15 marks END OF TEST

IF YOU FINTSH BEFORE TIME IS CALLED, CHECK YOUR WORr( ON THIS TEST.

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