10 Physics p4.doc

7/29/2019 10 Physics p4.doc

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Madhrasathul Ahmadhiyya, Male

SCOND TERM TEST 2003

PHYSICS Grade 10

Paper: 4 Alternative to Practical

Duration: 1 Hour

Name: Reg. No. .

Class: . Index: .

Instructions to candidates

Read the instructions carefully.

Write your name, index number, class and register number.

Answer ALL questions.

Write your answers in the space provided on the question paper.

Use a blue or black ballpoint pen to answer.

Information for candidates

The number of marks is given in brackets ( ) .

SECTION A

1- a) The diagram illustrates an experiment to measure g, the acceleration of free fall. A ball isdropped which breaks a light beam on photodiode. The clock is started when the ball stopsthe light shining on the photodiode. Vertically below the first light beam a second light beamshines on another photodiode. When the ball continuing in its fall breaks this beam, theclock is stopped.

i) Mark on the diagram the distance you would measure. [1]

Madhrasathul Ahmadhiyya Second Term Test 2003 Grade 10 Physics Paper 4 Page 1 of 5


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ii) t(the time taken to travel a distance s) and s are related by the question

2

1

2s gr=

Ifs is 5 cm and tis 0.1 s, calculate the value ofg.

[2]

iii) Explain one way, other than taking the average of a number of readings, bywhich the reliability of the experiment could be improved.

[1]

b) In an experiment to measure the acceleration of free fall, a mass of 1 kg was attached to apiece of tape. The mass was allowed to fall freely and the tape passedthrough a ticker timer which made 50 dots on the tape every school. The tape(not drawn to scale) is shown below. Measurements taken from the tape showthat the velocity at X was 25 cm/s and the velocity at Y was 125 cm/s.

Calculate the acceleration of the 1 kg mass between X and Y.

[2]

2. a) The diagram shows a flask containing water at 80C. A tube from the flask is connected to avacuum pump.



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i) What would be observed as the air above the water is withdrawn by the vacuumpump?

ii) Explain the observation.

b) The table below shows the temperature of a liquid in a beaker as it cools in a laboratory.

Temperature/C 86 60 55 55 55 55 49 41

Time/minutes 0 1 2 3 4 5 6 7

i) Draw a graph of temperature against time.

ii) State the freezing point of the liquid..

[3]

[1]

3. A magnet is moved steadily towards a solenoid as shown in the diagram. The ends ofsolenoid are connected to a low-resistance centre-zero galvanometer. As theN-pole of the magnet is moved towards the solenoid, the galvanometerdeflects to the right.

a) What will the deflection on the galvanometer be when

i) The magnet is moved ore quickly towards the solenoid?

[1]

ii) The magnet is turned round so that the S-pole faces the solenoid and themagnet is moved away from the solenoid?

[1]

iii) The magnet is held stationary with half the magnet inside the solenoid?

[1]

b) How will the deflection on the galvanometer alter when the N-pole is moving towards thesolenoid if

i) A high resistance is placed in series with the galvanometer?

[1]



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ii) A high resistance is placed in parallel with the galvanometer? Explain youranswer.

[2]

4. Sofoora and Shafinaz used the apparatus below to investigate the changes in pressure in agas as the temperature is varied.

To vary the temperature of the air in the flask the water bucket was used. The temperatureinside the bucket could be raised by adding boiling water.

They obtained the following results:

Temperature in C Pressure in kPa

0153045607590

95100105111116122127

a) How do you think the girls obtained the starting temperature of 0C in the bucket?

[1]

b) What precautions would they have taken to ensure that the temperature of the air inside the

flask is the same as that shown on the thermometer in the bucket?

[2]



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c) Their results are plotted on the graph below.

i) On the graph draw the line of best fit.

[1]

ii) Firux suggests that their results showed that the pressure is proportional totemperature. Haleema did not agree, saying If that were true then doubling thetemperature should double in the pressure. Our results dont show that! Doyou agree with Firux or Haleema? Discuss.

[2]

5. a) The diagram shows an object OO placed in front of a converging lens. The image is formedon the line XY.

i) Draw three rays leaving O (the arrow head at the top of the object) and passingthrough the lens. Show clearly the position of the image. [2]

ii) Show the path of two rays leaving M (the mid-point of OO which pass throughthe lens and travel to the image. [2]

b) Suppose the lens were dropped and broken into two approximately equal pieces. Whateffect, if any, would this have on the brightness and size of the image formedin (a) (i).

[2]

GOOG LUCK


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10 Physics p4.doc