soalan final sem 1 f5 2014 (1)

8/12/2019 Soalan Final Sem 1 f5 2014 (1)

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1. A student carries out an activity to record the temperature change of oil and water. Both liquidsare heated by identical heaters for two minutes. The initial temperature of oil and water are 30

o

C.

(a) Name the condition in which the temperature of the water is equal to the temperature of the

thermometer.

..( 1 mark )

(b) Observe Diagram 1.1 and Diagram 1.2. Compare,

(i) the mass of oil and mass of water.

.................................................................................................................. [1 mark]

(ii) the temperature change in oil and also in water.

.................................................................................................................. [1 mark]

(c) (i) Compare the amount of heat supplied by the heater to the oil and to the water.

.................................................................................................................. [1 mark]

(ii) Compare the amount of heat absorbed by oil and water.

................................................................................................................... [1 mark]

(iii) Name the physical quantity that will explain the comparison you made in 1(b)(ii).

................................................................................................................... [1 mark]

(d) If the heating time is increased to 5 minutes, will there be any change in the physical quantity in(c)(iii)? Explain your answer.

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

.............................................................................................................................................. [2 marks]


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2. Table shows two type of pot and their characteristics.Type of pot

Specific heat capacity, c 900 Jkg-1 o

C-1

390 Jkg-1 o

C-1

mass 3.5 kg 2.5 kg

a). What is the meaning of specific heat capacity.

( 1m )

b). Base on the table above state suitable characteristics of the pot if it is to be used for cooking

something rapidly.

Give reason for the suitable of the characteristics.

(i). Material for making the pot.

..

Reason:

...( 2m )

(ii). Material for making the handle of the pot.

.

Reason:

.( 2m )

(iii). Mass of the pot

..

Reason :

..( 2m )


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c). The pot are heated by using an electric hot plate of power 800 W.

base on the information in the table, calculate the time to achieve a temperature rise of 90oC for:

(i). The clay pot

( 2m )

(ii). The copper pot

( 2m )

d). Determine the most suitable pot that is the safer to handle and can be heated in shortest period of

time

( 1m )


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3 Diagram 3.1 shows an apparatus set up to observe a pattern of electric field.

Diagram 3.1

(a) (i) What is meant by electric field?

. *1 mark]

(ii) In the space below, draw electric field pattern formed by the apparatus arrangement on Diagram 8.1

( 2 marks )

(b) A current of 0.2 A is let to flow for 3 minutes.

Calculate

(i) Quantity of charge carried by the current

[2 marks]

(ii) Number of electrons flow in 3 minutes

[1 mark]


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(c) Q, R and S are three set of apparatus to observe electric field.

Table 1 shows the characteristics of each instrument used in the experiment.

Set of apparatus Type of power supply Type of electrode Type of liquid

Q Dry cell Glass rod Olive oil

R Extra high tension metal Olive oilS Low voltage supply carbon Olive oil

TABLE 1

Based on Table 1, state the suitable properties for the set of apparatus to observe the pattern of the

electric field.

(i) Type of power supply

..

Reason

.

[2 marks]

(ii) Types of electrodes

Reason

.

[2 marks]

(d) Based on the answers in 3(b), which set of apparatus is the most suitable to observe the electric field

..

[1 mark]

(e) State one reason why olive oil is used as liquid for the experiment.

.

[1 mark]


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4. Diagram 4.1 and diagram 4.2 show two electrical circuits. The ammeter and bulbs are identicalin both diagrams. Assume the internal resistance of the dry cell are zero.

a). Complete the sentence below.

The bulb in diagram 4.1 and diagram 4.2 are connected in ( 1 m )

b). Base on diagram 4.1 and diagram 4.2

(i). Compare the number of bulbs.

( 1 m )

(ii). Compare the reading of the ammeter.

( 1m )

(iii). State the relationship between the number of bulb and the reading of the ammeter.

( 1 m )

c). Give ONE reason that causes the difference in the ammeter reading of diagram 4.1 and diagram 4.2.

( 1 m )

d). Make the deduction relating the answer in 4(c ) and number of bulbs

( 1 m )


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e). diagram 4.3 shows an electrical circuit. The bulbs P, Q, R and S are identical.

(i). which two bulb light up brighter.

( 1 m )

(ii). Give ONE reason for the answer in ( e ) (i).

( 1 m )


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5. Diagram shows a current carrying wire placed between two opposite poles of two magnadurmagnet. The combination of magnetic field produces the resultant force, F.

(i) Name the rule to determine the direction of the force. ( 1 m )

(ii) In diagram below draw the resultant magnetic field produced.

( 2 m )

(iii). Using an arrow, show the direction of the resultant force, F, in diagram .


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b). diagram 5.3 shows a moving coil ammeter.

The scale of ammeter in diagram is not uniform due to the incorrect shape of the magnet used.

(i). In the space below draw the correct shape of the magnet and the pattern of the magnetic field

produced when the magnet is used.

( 2 m )

(ii). Give ONE reason why the magnet should have the shape as suggested in (b)(i).

(iii). Parallax error occurs when taking a reading using an ammeter.

Suggest ONE additional component to overcome an ammeter.

Component: ( 1 m )

explanation :..

( 2m )


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6. Diagram show a fixed coil is placed in between an iron rod and a bar magnet.

When the switch is closed both of the iron rod and the bar magnet are attracted towards the coil.

a). State the polarity at X.

( 1 m )

b). Suggest TWO modifications that can be done in diagram above in order to increase the force of

attraction between the coil and the iron rod.

..

( 2 m )

c (i). If the connection to the terminal of the battery are reversed, what will happen to the iron rod

and the bar magnet

.

( 2 m ).

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

..

( 2 m )

a. The battery is replaced by a low alternating current power supply. The switch is then closed.( i ). Describe the motion of the iron rod.

( 1 m )

( ii). Describe the motion of the bar magnet

( 1 m )

e). Using your answer in ( c ) and ( d ) state ONE application of iron rod with the coil in everyday life.

( 1 m )


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7. Diagram 1 and diagram 2 show the number of iron nails attached to an electromagnet. Theelectromagnet is connected to d.c. supply.

a. (i). What is the meaning of electromagnet . ( 1 m )(ii). Using diagram 7.1 and diagram 7.2 compare the number of turn of the coil, the reading of

the ammeter and the number of iron nails attached to the electromagnet.

Relate the reading of the ammeter with the number of iron nails attached to the

electromagnet to make the deduction regarding the relationship between the electric

current and the strength of electromagnet.

( 5 m )

b. Diagram 7.3 shows a relay. A relay is a switch which operated base on the principle of anelectromagnet.

Explain

(i). why the core of the relay is soft iron core. ( 1 m )

(ii). How the relay is function as a switch. ( 3 m )


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c. Diagram 7.4 shows an electric bell. When the switch is on, the bell rings continuously andproduces weak sound.

Using appropriate physics concepts, explain the use of suitable equipment to design an electric bell

which can produce louder sound.

Your answer should include the following aspect:

The number of turns of the coil.

The size of the gong

The shape of the soft iron core.

Thickness of wire of the coil. ( 10 m)


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8. Diagram show a deflection of a center zero galvanometer pointer when a magnet is pushed intoa coil. The deflection indicates that an induced current is produced in the coil.

a). (i). name the concept involved in producing the induced current. ( 1 m)

(ii). The concept involved in (a)(i) is also used for a transformer.

Explain the working principle of a transformer. ( 4 m )

(iii). Practically a transformer is not 100% efficient. Some energy is lost in the transformer. List the

factors that cause the energy loss in a transformer. ( 3 m )

( iv ). Diagram8.2 show a U shape soft iron core is wound with insulated copper wire PQ and RS.

An a.c. voltage of 240 V is connected at the end of PQ and a bulb 12 V, 60 W is connected

at the end of RS. Calculate the input current if the efficiency of the transformer is 80%.

( 2 m )

b ). The transmission of electricity over the national grid network uses high voltage cables. You are

assigned to study the characteristics of cables which could be used as transmission cable.

Table 2 show the characteristics of four transmission cables.

cable Resistivity (m-1

) Density (Kgm-3

) cost Rate of expansion

P 3.0 x 10-7

5 x 105 Low High

Q 1.8 x 10-8

2 x 103 Medium Low

R 7.5 x 10-7

8 x 103 High Medium

S 7.0 x 10-8

4 x 103 medium high

. Table 2

Base on the table 2,

(i). Explain the suitable of the characteristics of the cables to be used as transmission cable.

( ii ). Determine the most suitable transmission cable to be used and give reasons for your choice.

( 10 m )


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soalan final sem 1 f5 2014 (1)

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