Parer 2 Final(Source & Ms)

8/17/2019 Parer 2 Final(Source & Ms)

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Section A

Answer all the questions in this section. Answer in the spaces provided.

1 Diagram 1.1 shows a driver that is driving under a hot sun, sees a pool of water appearing on the road ahead, but

the pool of water disappears as the car approaches it.

Diagram 2.1

Diagram 1.1

(a) Name this natural phenomenon as observed by the driver.

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(b) "tate the physics concept that is involved in this phenomenon.

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(c) #i$ %ow is the density of the cool air compare to the density of the warm air&

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#ii$ 'hen light rays propagates from a denser medium to a less dense medium, state what happen to the direction

of the refracted rays.

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#iii$ (omplete Diagram 1.2 to show the formation of the natural phenomenon as

shown in Diagram 1.1.

Diagram 2.2

Diagram 1.2

[1 mar!

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2 )ig. 2.1 is a full*scale diagram that represents a sound wave of frequency +.1 % in air.

Fig. 2.1

(a) (i) -n )ig. +.1, mar the position of one compression with the letter ( and of one

rarefaction with the letter . [2!

(ii) /sing the full*scale diagram, measure the wavelength of this sound wave.

wavelength 0 .................................................. [1!

(iii) (alculate the speed of sound in air.

speed 0 .................................................. [!

(b) A sound wave is longitudinal. Describe how a longitudinal wave differs from a transversewave.

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3 )ig. .1 shows the cone of a loudspeaer.

Fig. 3.1

(a) "ound is being produced. Describe in detail the behaviour of the cone and the air near

to it.

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(b) he lowest frequency that a human can hear is 23 %.

(i) "tate the highest frequency that a human with normal hearing can hear.

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(ii) (alculate the longest wavelength of sound that a human can hear. he speed of

sound in air is 43 m 5 s.

wavelength 0 ................................................ [2!


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Mark Scheme

4 )ig. 4.1 shows an old coin displayed in a museum.

Fig. 4.1

he coin is vertical and is supported by a transparent stand. A vertical mirror 3.16 m behind

the coin ensures that the bac of the coin can be seen by a visitor looing from the line 7.

8 is a point on the bac of the coin.

(a) -n )ig. 4.1,

(i) draw two rays of light from 8 to show how its image is produced, [2!

(ii) label the image 9. [1!

(b) "tate the distance from point 8 on the coin to its image.

distance 0 .................................................. [1!

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5. Diagram +.1 shows a simple electromagnet used for lifting and releasing a small metal ball.

Diagram +.1

#a$ 9n Diagram +.1, mar the direction of the current flow in the solenoid when the switch is on.

#b$ #i$ Name the magnetic pole at the end of the core P when the switch is on&

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[ 1 mark

#ii$ "tate the rule used to determine the pole of the magnetic field.

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[ 1 mark

#iii$ ;ased on the solenoid in Diagram +.1, draw the magnetic field lines that is form around the solenoid when

the switch is on. 9n your diagram show the direction of the magnetic field lines.

[ 2 marks


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#c$ ;ased on able +, state the suitable properties to be chosen to built an electromagnet and state the reason for

your choice.

#i$ 8aterial used for the core

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[ 1 mark

#ii$ eason::::::::::::::::::::::::::::..

[ 1 mark

#iii$ "hape of the core

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[ 1 mark

#iv$ eason

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[ 1 mark6 he electromagnet in < #c$ is used in an electric bell as shown in Diagram plain the woring principle of the electric bell..............................................................................................................................

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[ marks

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7 Diagram 7.1 and Diagram 7.2 show an identical pencil is immersed in the distilled waterand sea

water respectively.

Diagram 7.1 Diagram 7.2(a) Based on Diagram 7.1 and Diagram 7.2,

(i) compare the bending o the pencil!..!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!...!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.

[1 mark (ii) compare the density o distilled water and the sea water..!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.

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(iii) state the relationship between the density o water with the bending o the pencil..!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!...!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.

[1 mark (b) Based on Diagram 7.1, compare the si"e o the observed pencil inside and o#tside the

distilled water!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!.


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[1 mark (c) $ame the phenomenon shown in Diagram 7.1 and Diagram 7.2

!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!.[1 mark

(d) Diagram 7.% shows a coin in a bea&er 'lled with water. n Diagram 7.% , draw a raydiagram rom a coin to the eye to show how the image o the coin is ormed.

Diagram 7.3[2 marks

Mark Scheme

8 )ig.?.1 shows three wavefronts in a beam of yellow light passing through air. he wavefronts

are one wavelength apart. he beam meets a glass surface. A; is a ray of light that shows

the direction of travel of the wavefronts.

Fig. 8.1

(a) (omplete )ig. ?.1 by


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(i) continuing the ray A; to show the ray inside the glass,

(ii) continuing wavefront 1 inside the glass. [2!

(b) "tate what happens to the speed and wavelength of the waves as the beam moves from

the air to the glass.

(i) speed ........................................................................................................................

(ii) wavelength ............................................................................................................[2!


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(c) he beam of yellow light in )ig. ?.1 is replaced with a beam of red light.

Describe two ways in which the completed )ig. ?.1 would change.

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

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2. .....................................................................................................................................

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Section

Answer two questions from this section. Answer in the spaces provided.

@. An echo sounder on a ship produces a pulse of sound. A fishing boat uses the sound echo to determine the depth

of seabed. Bou are assigned to investigate the suitable characteristics of the waves that could be used to determine

the depth the seabed.

a$ . "tate one phenomenon of waves that produces C echo

[ 1 mar !

b$. adio waves is used to detect the position of an aero plane and sonar technique is used to detect the shoal of

fish below the boat.

#i$ "tate the difference between radio waves and sound waves.

#ii$ =>plain why the speed of sound is greater in water than that in air&

[ 4 mars!c$ able @.2 shows the specification of five waves 7,E,," and that can be used to determine the position of a

shoal of fish.


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Bou are required to determine the most suitable waves. "tudy the waves based on the following aspectsF

i$ he type of the waves transmitted

ii$ he frequency of the waves

iii$ he speed of the waves

iv$ 7enetrating power of waves

[13 mars!


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Mark Scheme

1! (a) )ig. 13.1 shows a young boy lying on his bac on the bottom of a swimming pool. %e is

holding his breath and his eyes are open. A red light is positioned on the ground at E.

At first the boys head is touching the pool wall. %e notices that, as he slides away fromthe pool wall, his eye reaches a point 7 where he first sees the light at E. )ig. @.1 shows

the boy in this position.

Fig. 1!.1

(i) -n )ig. 13.1, draw the ray of light travelling from E to 7. 8ar the critical angle for

light in water and label it (. [2!


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(ii) =>plain why the boy is unable to see the red light at E when his eye is closer to the

pool wall than 7.

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(iii) he critical angle is 4@G. (alculate the refractive inde> of water.

refractive inde> 0 ......................................... [2!

(i") he red light is now replaced with a blue light. "tate the effect of this on the wavelength of the light in the air.

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(b) A small, very brightly illuminated display is located at the bac of a proHector. he proHector lens produces an

inverted and magnified image of the display on a white classroom wall. )ig. 13.2 is a scale diagram showing the

position and sie of both the display and the image on the wall. is a point on the display.

Fig. 1!.2

(i) he image is inverted and magnified. "tate two other properties of the image.

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

2. ...............................................................................................................................

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(ii) -n )ig. @.2, draw the straight*line ray from to the image. [1!

(iii) -n )ig. @.2, draw a vertical line representing the lens and label it I. [1!

(i") A second ray from to the image passes through a focal point #principal focus$ of the lens. -n )ig. @.2, drawthis ray and use it to mar this focal point. Iabel this focal point ). [2!

(") Determine the focal length of the lens.

focal length 0 ......................................... [2!

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11 )ig. 11.1 shows an e>periment in which a bell rings inside a glass Har.

Fig. 11.1

"ound is heard outside the Har.

(a) (i) =>plain how sound is transmitted by the molecules of the air and the Har.

(ii) "tate and e>plain what is heard outside the Har as the air is removed from the Har.

[4

(b) o investigate a layer of roc underground, an e>plosion is made on the surface of the =arth.

)ig. 11.2 shows the arrangement.

Fig. 11.2

"ound from the e>plosion may travel to the detector through air #path 1$, through earth #path 2$,

or by reflection from a layer of roc #path 3$. "ome sound travels into the layer of roc by path 4.

he time taen for the sound to reach the detector is shown in the table.


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(i) =>plain why sound arrives first at the detector along path 2.

(ii) Jiven that the speed of sound in air is 23 m5s, calculate the distance between the source of sound and the

detector.

(iii) /se your answer to (ii) to calculate the speed of sound in earth.

(i") Iight and sound are both waves and may be refracted and reflected. he sound travelling along path 5undergoes total internal reflection.

1. =>plain what is meant by total internal reflection.

2. =>plain how )ig. 11.2 shows that sound travels faster in the layer of roc than itdoes in earth.

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Parer 2 Final(Source & Ms)