assessment chapter

8/2/2019 Assessment chapter

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Assessment chapter 1

1. Which of the following is a base SI

quantity?

A Weight B Energy

C Velocity D Mass

2. Which of the following is a derived

quantity?

A Length B Mass

C Temperature D Voltage

3. Which of the following is not a

basic unit?

A Newton B kilogram

C ampere D second

4. Which of the following quantities

cannot be derived?

A Electric current B Power

C Momentum D Force

5. Which of the following quantities is

not derived from the basic physical

quantity of length?

A Electric charge B Density

C Velocity D Volume

6. Initial velocity u, final velocity v,

time t and another physical quantity k

is related by the equation v - u = kt.

The unit for k is

A m s-1 B m-1 s

C m s-2 D m2 s-2

7. Which of the following has the

smallest magnitude?

A megametre B centimeter C kilometre D mikrometre

8. 4 328 000 000 mm in standard form is

A 4.328 x 10-9 m

B 4.328 x 10-6 m

C 4.328 x 106 m

D 4.328 x 109 m

9. Which of the following measurements

is the longest?

A 1.2 x 10-5

cmB 120 x 10-4 dm

C 0.12 mm

D 1.2 x 10-11 km

10. The diameter of a particle is 250 m.What is its diameter in cm?

A 2.5 x 10-2 B 2.5 x 10-4

C 2.5 x 10-6 D 2.5 x 10-8

11. Which of the following prefixes is

arranged in ascending order?

A mili, senti, mikro, desi

B mikro, mili, senti,

desi

C mili, mikro, desi, senti

D desi, mikro, mili,senti

12. Velocity, density, force and energy

are

A basic quantities

B scalar quantities

C derived quantities

D vector quantities

13. Which of the following shows thecorrect conversion of units?

A 24 mm3 =2.4 x 10-6 m3B

300 mm3=3.0 x 10-7 m3

C 800 mm3=8.0 x 10-2 m3

D 1 000 mm3=1.0 x 10-4 m3

14. Which of the following measurements

is the shortest ?

A 3.45 x 103 m

B 3.45 x 104 cm

C 3.45 x 107

mmD 3.45 x 1012 m

15. The Hitz FM channel broadcasts radio

waves at a frequency of 92.8 MHz in

the north region. What is the frequency

of the radio wave in Hz?

A 9.28 x 104 B 9.28 x 105

C 9.28 x 107 D 9.28 x 1010

16. An object moves along a straight line

for time, t. The length of the line, s is


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given by the equation2

2

1gts = . The

SI unit of g is

A m2 s2 B m s-2

C s-1 D s-2 m

Part B : Structure Question

1. A car moves with an average speed of 75 km h-1 from town P to town Qin 2 hours as shown in Figure 1. By using this information, you maycalculate the distance between the two towns.

P Q

Figure 1(a) (i) Based on the statements given, state two basic quantities and

their respectiveSI units.

(ii) State a derived quantity and its SI unit.

(b)Convert the value 1 . m to standard form.5 x 10-3

(c) Complete Table 1 by writing the value of each givenprefix.

Table 1(d)Power is defined as the rate of change of work done. Derive the unit

for power in terms of its basic units.

(e) Calculate the volume of a wooden block with dimension of 7 cm, 5cm breadth and 12 cm height in m3 and convert its value instandard form.


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2. Figure 2 shows an ammeter of 03 A range.

Figure 2

(a)(i) Name component X....

(ii) What is the function of X?.

(b)Table 2 shows three current readings obtained by three students.

Table 2(i) Did all the students use the ammeter in Figure2? ..

.(ii) Explain your answer in (b)(i).

3. Figure 3 shows the meniscus of water in a measuring cylinder K, L, andM are three eye positions while measuring the volume of the water.

re 3 Figure 4


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(a) (i) Which of the eye positions is correct while taking the reading of thevolume of water?

.

(b) The water in the measuring cylinder is replaced with 30 cm3 ofmercury.

(i) In Figure 4, draw the meniscus of the mercury in the measuringcylinder.

(ii) Explain why the shape of the meniscus of mercury is as drawn in(b)(i).


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Assessment chapter 2

Part A : Objective Questions1. When a coconut is falling to the

ground, which of the following

quantities is constant?

A. Velocity

B. MomentumC. Acceleration

D. Kinetic energy

2. In an inelastic collision, which of thefollowing quantities remains

constant before and after the

collision?

A. Total acceleration

B. Total velocityC. Total momentum

D. Total kinetic energy

3. Calculate the weight of a stone with

mass 60 g on the surface of themoon.

(The gravitational acceleration of the

moon is 1/6 that of the Earth.)

A. 0.1 N

B. 0.2 NC. 0.4 N

D. 0.6 N

E. 0.8 N

4. The momentum of a particle is

dependent on

A. mass and acceleration

B. weight and force

C. mass and velocity5. Which of the following diagrams

shows a body moving at constant

velocity?

A. 2 N 2N

B. 12 N 7 N

C. 12 N 14 N

D. 20 N 17 N

6. The graph below shows the motionof a trolley with mass 1.5 kg.

Velocity / ms-1

4

0 2 4 6 Time / s

Calculate the momentum of thetrolley from t = 2s to t = 4s.

A. 1.5 kg m s-1B. 3.0 kg m s-1

C. 4.0 kg m s-1

D. 6.0 kg m s-1

E. 7.5 kg m s-1

7. This figure shows an aircraft flyingin the air.

8. m = 0.3 kg

5 m

Lift

Thrust Air friction

Weight

The aircraft above accelerates if

A. Lift > Weight

B. Thrust > Lift

C. Lift > Air friction

D. Thrust > Air friction


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What is the momentum of the stone

just before it hits the ground?

A. 0.15 kg m s-1

B. 0.3 kg m s-1

C. 1.5 kg m s-1

D. 3.0 kg m s-1E. 15.0 kg m s-1

9. A big ship will keep moving for some

distance when its engine is turned off.

This situation happens because the shiphas

A. great inertia

B. great accelerationC. great momentum

D. great kinetic energy

10. An iron ball is dropped at a height of

10 m from the surface of the moon.

Calculate the time needed for theiron ball to land.

(Gravitational acceleration of the

moon is 1/6 that of the Earth andg = 9.8 N kg-2)

A 0.6 sB 1.4 s

C 1.7 s

D 3.5 sE 12.0 s


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Part B : Structure Questions

1.

(i) Car A (ii) Car B

Diagram 1.1

Diagram 1.1(i) and (ii) show two methods used by the mechanic to move a breakdown

car. A constant force, F = 500 N is used to push and pull the car in method A and B.(a) (i) Which method is easier to move the car?

(ii) State a reason for your answer in (a)(i).

(b) The frictional force acting between the car and track surface in both methods is

200 N. Calculate, the(i) horizontal resultant force in method A.

(ii) horizontal resultant force in method B.

(iii) acceleration of the car in method B.

( c ) Suggest a method to move Car B so that the acceleration produced is equal to that

of method A.

....

2. ceiling


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Tin water M N hand

P Q R

(i) Diagram 2.1 (ii)

a) Diagram 2.1(i) shows tin P that is empty and tin Q that is filled with water. A

student find difficult to pushed tin Q. Write the inference about the observation.

b) Diagram 2.1(ii) shows a tin being released from the different positions M and N.

The hand of a student at position R needs greater force to stop the motion of the

tin falling from position M. Explain this observation.

c) Based on the observation (i) and (ii), state two factors that affect the magnitude of

the momentum of the object.

d) If water flows out from a hole at the bottom of the tin Q, how would the inertia of

Tin Q depends on time ?

3. 2 ms-1

P iron ball ( 2 kg )

S T3.0 m smooth surface

1.0 m 2.0 m

Q R

Diagram 3 Rough surface

The figure shows a iron ball that is rolled through PQRST. The rough surface of QR has

frictional force of 4 N.a) Calculate

(i) the kinetic energy of the iron ball at P.

(ii) the potential energy of the iron ball at P.


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(iii) the total of energy of the iron ball at P.

b)

c) (i) Calculate the total of energy of the iron ball when it reaches at Q ?

(ii) Calculate the work done against friction along QR.

d) Calculate the total kinetic energy of the iron ball at S.

e) Calculate the speed of the ball at position T.

Part C : Essay Questions

1.

(i) (ii)

Diagram 1.1

Diagram 1.1(i) shows the condition of a car moving at high velocity when it suddenly

crashes into a wall.

Diagram 1.1(ii) shows a tennis ball hit with racquet by a player.a) (i) What is the meaning of momentum?

(ii) Based on the observations of Diagram (i) and (ii), compare the

characteristics of car when it crashes into the wall and the tennis ball when

it is hit with a racquet. Hence, relate these characteristics to clarify aphysics concept, and name this concept.

b) Explain why a tennis player uses a taut racquet when playing.


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c) In launching a rocket, a few technical problems have to be overcome before the

rocket can move upright to the sky. By using appropriate physics concepts,describe the design of a rocket and the launch techniques that can launch the

rocket upright.

2.

Brand Reaction time / s Mass / kg

Engine thrust

force / N

Resistance

force / N

A 0.3 1.5 10.0 4.0

B 0.5 1.8 12.5 2.4

C 0.2 0.9 6.5 2.2

D 0.6 2.5 16.0 6.5

In a radio-controlled car racing competition, 4 mini-cars branded A, B, C and D tookpart. The information of the 4 cars is given in the table above. Details of the above

information are given as below;

Reaction time - Duration between the moment the radio-controlled is switched on andthe moment the car starts moving.

Resistance - Average value of opposing forces includes the friction between

wheels and track, and air resistance.

(a) What is the meaning ofacceleration?

(b) Draw a graph of velocity against time that shows a car moving initially withconstant acceleration, then moving with constant velocity and followed by

constant deceleration until it stops.

(c) Explain the suitability of the properties in the above table in constructing a radio-controlled car racing purpose. Hence, determine which brand of car will win the

50-metre race.

(c) If Car B in the above table is moved up the plane at the angle of 30o to the

horizon,

(i) Show that the car is able to move up the plane.(ii) Determine the acceleration of the car.

Properties


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Assessment Chapter 3

Part A: Objective Question

1. A cylinder has a mass of 12kg and a

cross-sectional area of 200cm2. What

is the pressure acting at its base?

A. 6 kPa D. 15 kPa

B. 9 kPa E. 18 kPa

C. 12 kPa

2. Wind blows normally on a wall at a

pressure of 200kPa. If the wall has

an area of 5m2, what is the force

acting on the wall?

A. 40kN D. 1200kN

B. 800kN E. 1600kN

C. 1000kN

3. Which of the following factor does

not influence the pressure of a

liquid?

A. Depth

B. Acceleration due to gravity

C. Density

D. Volume

4. Mercury has density of 13600kgm-3.

If the pressure of mercury is 650kPa,

what is the depth from its surface?

A. 4.0m D. 6.4m

B. 4.8m E. 8.0m

C. 5.8m

5. What is the pressure of the gas

trapped inside the J-tube, in Pa unit?

A. 1.19 x 105 Pa

B. 1.90 x 105 Pa

C. 2.19 x 105 Pa

D. 2.90 x 105 Pa

E. 3.14 x 105 Pa

6. Which instruments is meant for

measuring atmospheric pressure?

A. Carburetor

B. Siphon

C. Fortins Barometer

D. Hydrometer

7. Figure 7 shows a hydraulic jack.

Piston A and piston B have cross-

sectional areas 5cm2 and 100cm2

respectively. If mass of 3kg is placed

on piston A, what is the maximum

weight that can be lifted by piston B?


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A. 300N D. 900N

B. 600N E. 1000N

C. 800N

8. Which of the following device is

based on the Pascals Principle of

pressure transmission?

A. Hydrometer

B. Cars hydraulic brake

C. Bunsen burner

D. Fire extinguisher

9. A ship of mass 80000kg floats on the

sea surface. If the density of the sea

water is 1250kgm-3, what is the

volume of the displaced sea water?

A. 6.4 m3 D. 800 m3

B. 64 m3 E. 900 m3

C. 640 m3

10. Figure 10 shows metal tube is

blowed hardly at the opening. It is

observed that the polystyrene ball is

lifted to the opening of metal tube.

This phenomenon occurs because

A. The air velocity at the upper

section of the metal tube is

less than the air velocity at its

lower section.

B. The air pressure at the upper


less than the air pressure at its

lower section.

C. The air density at the upper


more than the air density at

its lower section.

D. The air temperature at the

upper section of the metal

tube is more than the air

temperature at its lower

section

Figure 7 Blow hard

Polystyreneball

Metal tube


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Part B: Structured Question

1.

FIGURE 1

Figure 1 shows a Perodua Myvi with a mass of 900 kg.

Air pressure for each tyre is 2 x 105 Pa.

(a) What is the meaning of pressure ?

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

(b) Calculate the area in contact with the ground for each tyre.

(c) Zamani drives his car to his school with a distance of 10km and find his car tyre

become harder than usual. Explain why this is happen?

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

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

2. Diagram shows a set up of apparatus for measuring atmospheric pressure.

(a) What is the name for the instrument?

(b) Determine the atmospheric pressure as measured by the instrument ,


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(i) in the cm Hg unit

..

(ii) in the Pa unit

..

(c) State the change of length of the mercury column above the mercury surface

(i) The tube is raised by 10cm ...

.

(ii) The surrounding temperature increases

..

(iii) The instrument is brought to the peak of a mountain

..

(iv) Water vapor is brought to the vacuum region

Part C: Essay Question

1.

(a) A fisherman finds that his boat is at different levels in the sea and in the river, although

the boat carries the same load. The density of sea water is 1 025 kg m-3 and of river water

is 1 000 kg m-3.

Figure 1 and 2 illustrate the situation of the boat in the sea and in the river.

(i) What is meant by density?

(ii) Using Figure 1 and 2, compare the levels of the boat and the volumes of water

displaced by the boat.


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Relating the mass of the boat with its load, the volume of water displaced and the

density of the water, deduce a relevant physics concept.

(iii) Name the physics principle that explains the above situation.

(b) A submarine can sail on the sea surface and under the sea.

Explain how a submarine on the surface submerges.

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

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

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

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

2. Figure below shows an iron penetrates a layer of sand placed in a beaker. When

water is poured into the beaker, the iron rod makes another penetration into the sand layer as

shown in figure below.

Based on the observation,

a) state one suitable inference that can be made

Iron rod

Sand

Water


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b) state one appropriate hypothesis for an investigation

c) with the use of apparatus such as spring balance, load, thread, eureka can and other

apparatus, describe an experiment framework to test your hypothesis. In your description, state

clearly the following:

i) aim of the experiment

ii) variable in your experiment

iii) list of apparatus and materials

iv) arrangement of the apparatus in a sketch

v) the procedure of the experiment

vi) the way you list the data

vii) the way you would analyse the data


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PART A: CHAPTER 4

1. A 5kg iron sphere of temperature

500C is put in contact with a 1kg copper

sphere of temperature 273K and they are put

inside an insulated box. Which of thefollowing statements is correct when they

reach thermal equilibrium?

A. A iron sphere will have a

temperature of 273KB. The copper sphere will have

a temperature of 500C.C. Both the sphere have the

same temperature.

D. The temperature of the iron

sphere will be lower than 500C

2. In the process to transfer heat from

one object to another object, which of thefollowing processes does not involve a

transfer to material?

A. ConvectionB. Vaporisation

C. Radiation

D. Evaporation

3. When we use a microwave oven to

heat up some food in a lunch box, we should

open the lid slightly. Which of the followingexplanations is correct?

A. To allow microwave to go

inside the lunch boxB. To allow the water vapors to

go out, otherwise the box will

explodeC. To allow microwave to

reflect more times inside the

lunch box

D. To allow microwave to

penetrate deeper into the lunch

box.

Water is generally used to put outfire. Which of the following explanation is

not correct?A. Water has a high specific

heat capacity

B. Steam can cut off the supply

of oxygenC. Water is easily available

D. Water can react with some

material

Given that the heat capacity of a

certain sample is 5000 J0C-1. Which of thefollowing is correct?

A. The mass of this sample is

1kg.B. The energy needed to

increase the temperature of 1 kg

of this sample is 5000 J.

C. The energy needed toincrease the temperature of 0.5kg

of this sample is 2500J.

D. The temperature of thissample will increase 10C when 5

000 J energy is absorbed by this

sample.

Which of the following statement is

correct?


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A. The total mass of the object is

kept constant when fusion

occurs.B. The internal energy of the

object is increased when

condensation occursC. Energy is absorbed when

condensation occurs.

D. Energy is absorbed whenvaporization occurs.

7. Water molecules change their states

between the liquid and gaseous statesA. only when water vapour is

saturatedB. at all times because

evaporation and condensation

occur any time

C. only when the vapour molecules produce a pressure as

the same as the atmospheric

pressureD. only when the water is

boiling

8. Based on the kinetic theory of gas

which one of the following does not explain

the behaviour of gas molecules in acontainer?

A. Gas molecules move

randomly

B. Gas molecules collideelastically with the walls of the

container

C. Gas molecules move faster astemperature increases

D. Gas molecules collide

inelastically with each other

9. A cylinder which contains gas is

compressed at constant temperature of the

gas increase because

A. the average speed of gas

molecules increases

B. the number of gas moleculesincreases

C. the average distance between

the gas molecules increasesD. the rate of collision between

the gas molecules and the walls

increases

10. A plastic bag is filled with air. It is

immersed in the boiling water as shown in

diagram below.

Which of the following statements is

false?

A. The volume of the plastic bag

increases.

B. The pressure of air moleculesincreases

C. The air molecules in the bag

move fasterD. The repulsive force of boiling

water slows down the movement

of air molecule


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PART B;

1. A research student wishes to carry out an investigation on the temperature change

of the substance in the temperature range -500C to 500C. The instrument used to measure

the temperature is a liquid in glass thermometer.

Table 1

(a) (i) State the principle used in a liquid- in glass thermometer.(1m)

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

........

(i) Briefly explain the principle stated in (a)(i) (3m)

(b) Table 1 shows the characteristic of 4 types of thermometer: A,B C and D. On the

basis of the information given in Table 1, explain the characteristics of, and

suggest a suitable thermometer for the experiment.(5 m)

Thermometer A B C D

Liquid Mercury Mercury Alcohol Alcohol

Freezing point of liquid (0C) -39 -39 -112 -112

Boiling point of liquid (0C) 360 360 360 360

Diameter of capillary tube Large Small Large Small

Cross section


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(c) The length of the mercury column in uncalibrated thermometer is 6.0cm and 18.5

cm at 00C and 1000C. respectively. When the thermometer is placed in a liquid,

the length of the mercury column is 14.0cm

(i) Calculate the temperature of the liquid

(ii) State two thermometric properties which can be used to calibrate a

thermometer. (6m)

2. A metal block P of mass 500 g is heated is boiling water at a temperature of

1000C. Block P is then transferred into the water at a temperature of 300C in a

polystyrene cup. The mass of water in the polystyrene cup is 250 g. After 2 minutes, the

water temperature rises to 420C.

Figure 2


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Assuming that the heat absorbed by the polystyrene cup and heat loss to the

surroundings are negligible.{Specific heat capacity of water 4 200 j kg-1 C-1)

Calculate

(a) the quantity of heat gained by water the polystyrene cup

(b) the rate of heat supplied to the water

(c) the specific heat capacity of the metal block P

3. A student performs an experiment to investigate the energy change in a system.

He prepares a cardboard tube 50.0 cm long closed by a stopper at one end. Lead shot of

mass 500 g is placed in the tube and the other end of the tube is also closed by a stopper.

The height of the lead shot in the tube is 5.0 cm as shown in Figure 3.1. The student then

holds both ends of the tube and inverts it 100 times (Figure 3.2).

Figure 3.1 Figure 3.2


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(a) State the energy change each time the tube is inverted.

(b) What is the average distance taken by the lead shot each time the

tube is inverted?

(c) Calculate the time taken by the lead shot to fall from the top to

the bottom of the tube.

(d) After inverting the tube 100 times, the temperature of the lead

shot is found to have increased by 30C.

i. Calculate the work done on the lead shot.

ii. Calculate the specific heat capacity of lead.

iii. State the assumption used in your calculation in (d)ii.


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PART C: EXPERIMENT

1. Before travelling on a long journey, Luqman measured the air pressure the

tyre of his car as shown in Figure (a) He found that the air pressure of the tyre was

200 kPa. After the journey, Luqman measured again the air pressure of the tyre as

shown in Figure (b) He found that the air pressure had increase to 245 kPa.

Luqman also found that the tyre was hotter after the journey although the size of

the tyre did not change.

Using the information provided by Luqman and his observations on air pressure

in the tyre of his car:

(a) State one suitable inference that can be made. [1 mark]

(b) State appropriate hypothesis for an investigation. [1 mark]

(c) Design an experiment to investigate the hypothesis stated in (b).

Choose suitable apparatus such as pressure gauge, a round-bottomed flask and

any other apparatus that may he necessary. In your description, state clearly the

following:

i. Aim of the experiment,

ii. Variables in the experiment,

iii. List of apparatus and materials,

iv. Arrangement of the apparatus,

Figure (a) Figure (b)


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v. The procedure of the experiment including the method of controlling the

manipulated variable and the method of measuring the responding variable,

vi. The way you would tabulate the data,

vii. The way you would analyse the data. [10 marks]

Inference

Hypothesis

Aim

Variable Constant variable :

Manipulate variable :

Responding variable :

Material and Apparatus

Arrangement of

apparatus

Procedure


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Tabulation of Data

Analysis of Data


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Assessment chapter 5 Light

Part A:

1. Between the following statements about reflection of light, which is not true?

A. All light energy incident on a plane mirror is reflected.

B. The angle of incidence is always the same as the angle of reflection.C. The incident ray, the reflected ray and the normal to the point of incidence, all lie

on the same plane.

D. The speed of the reflected ray is the same as the speed of the incident ray.

2. A boy stands in front of a plane mirror. He observes the image of some letterings

printed on his shirt. The letterings on his shirt is as shown in Figure 1.

Between the following images, which is the image observed by the boy?

3. Figure 2 shows an object, O placed in front of a plane mirror. Between the positions

A, B, C and D, which is the position of the image?

4. A student is moving with a velocity of 2 m s-1 towards a plane mirror. The distancebetween the student and his image will move towards each other at the rate

A. 2 m s-1 B. 3 m s-1 C. 4 m s-1 D. 5 m s-1 E. 6 m s-1

Figure 1

A B C D

O

A B C D

Plane mirror

Figure 2


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5. The table below shows the characteristics of the images formed by a concave

mirror for various positions of the object. All symbols used have the usual meanings.Which of them is not true?

Position of object Characteristics of imageA u > 2f Diminished, inverted, real

B f < u < 2f Magnified, inverted, real

C u = f Same size, inverted, real

D u < f Maginfied, upright, virtual

6. Which of the following ray diagram is correct?

7. The depth of a swimming pool appears to be less than its actual depth. The lightphenomenon which causes this is

A. ReflectionB. Refraction

C. Diffraction

D. Interference

8. The critical angle in glass is 42o. What is the refractive index of glass?

A. 1.2 B. 1.3 C. 1.4 D. 1.5 E. 1.6

9. Which of the following are the characteristics of an image formed by a magnifying

glass?

A. Magnified, virtual, inverted

B. Diminished, real, uprightC. Magnified, virtual, upright

D. Diminished, virtual, inverted

50o50o

C F

Convex mirror

C F

Concave mirrorPlane mirror

A B C


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10. A student is given three convex lenses of focal lengths 2 cm, 10 cm and 50 cm. He

wishes to construct a powerful astronomical telescope. Which of the following

arrangements should he choose?

Focal length of objective lens /

cm

Focal length of eye lens / cm

A 50 2

B 10 10

C 2 50

D 50 10

Part B

1.

Figure 3 shows the eye of a person looking at a fish.

a) Sketch a ray diagram consisting of 2 rays originating from the eye of the fish to showwhy the image of the fish is seen closer to the surface.

b) The fish is at a depth of 2 m. If the refractive index of water is 1.33, calculate the

apparent depth of the fish.

air

water

Eye

Figure 3


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2.

a) Starting with the lens formula,fvu

111=+ , derive an equation that gives the

relationship between liner magnification, m and the image distance, v. Hence sketch the

graph ofm against v on the axes provided below.

(b) State the value ofm at the point of intersection of the graph with the vertical axis.

(c) Describe how you would determine the focal length of the lens using the graph.

Part C

1.

A student used a slide projector to project a picture onto the screen. Figure 1a and 1b

show the relative positions of the slide, projector lens and the screen.It is observed that when the screen is moved further away (Figure 1b), the lens of the

projector has to be moved nearer to the slide to obtain a sharp image.

0

m

v


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Based on your observations and knowledge of lenses;

a) make one suitable inference.

b) state an appropriate hypothesis that could be investigated.

c) describe how you would design an experiment to test your hypothesis using a convex

lens, filament bulb and other apparatus.

In your description, state clearly the following:

(i) aim of the experiment

(ii) variables in the experiment

SlideScreen

image

Figure 1a

Figure 1b

Projector

lens

Projector

lens

Slide

Screen

image


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(i) List of apparatus and materials

(ii) Arrangement of the apparatus

(iii) The procedure of the experiment, which includes the method of controlling the

manipulated variable and the method of measuring the responding variable

(iv) The way you tabulate the data

(v) The way you would analyse the data


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2.

A student carried out an experiment to investigate the relationship between object

distance, u, and image distance, v, for a convex lens. The student used various valuesofu and recorded the corresponding values ofv. The student then plotted the graph

of uv against u + v as shown in Figure 2.

Figure 2

500

450

400

35055

3000

250

2000

150

100

50

uv/ cm2

10 20 30 40 50

u + v / cm


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a) Based on the graph in Figure 2,

(i) state the relationship between uv and u + v

[1 mark](ii) determine the value ofu + v when the value ofuv = 400 cm2. Show on the

graph how you obtained the value of u + v.

From the value ofu + v obtained, calculate the image distance, v when u = 20

cm.

[3 marks](iii) calculate the gradient of the graph. Show clearly on the graph how you

obtained the values needed for the calculation.

[3 marks]b) Given that the relationship between u, v and focal length,fof the convex lens used, is

represented by the equation

1 + 1 = 1 u v f

Derive an equation which gives the relationship between uv and (u + v ).

[2 marks]c) Using the equation derived in (b), and the value of gradient calculated in (a)(iii),

determine the focal length of the lens used in the experiment.

[2 marks]d) State one precaution taken to ensure the accuracy of the experiment.

[1 mark]


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assessment chapter

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