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1 Physics p 1 Year 11 Sri Lankan School Muscat Frist Term Examination 2015

Sri Lankan School Muscat

Withdrawal Examination 2015/2016

Class :

Subject :

Paper :

Duration:

Name :………………………………………....

Admission No: ……………….

Instructions to Candidates: Write your name in your answer script.

Answer ALL questions in the spaces provided in this booklet.

Calculators may be usedShow all stages in any calculation and state the units if necessary. There are 08 questions and 15 pages in the paper.

The Total marks for the paper is 60

Paper Set By: Mr. Dinesh Weerasinghe.

Q.No. Marks

Allocated Obtained

1 14

2 06

3 08

4 09

5 06

6 06

7 05

8 06

Total 60

Year 11B/R

Physics

2

1 Hours

Percentage

%

Grade


Answer All the Questions Q1.

A student investigates friction between a block of wood and different types of surface.

(a) The student uses the equipment shown in photograph A to measure the force needed to move the block of wood.

(i) Suggest why the student places masses on the block. (1)

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(ii) Explain why he keeps the masses constant during the experiment.

(1)

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.............................................................................................................................................. (b) The student investigates five different types of surface.


The table shows his results.

(i) Give an example of a non-continuous variable in this investigation. (1)

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.............................................................................................................................................. (ii) Complete the table by inserting the missing average.

(1) (iii) Display the average force results for this investigation on the grid.

(4)

(c) The student compares his results with others in the class.


He finds that they have different values for the forces. Suggest why.

(2)

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.............................................................................................................................................. (d) The student repeats the investigation using another block of wood as shown in photograph B.

This block of wood has the same mass but a different area of contact. Explain how this change affects the pressure on the surface.

(2)

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(e) Suggest two ways in which the student could reduce friction between the two surfaces.


(2)

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(Total for question 1 = 14 marks) Q2.

(a) State what is meant by the term magnetic field line. (1)

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.............................................................................................................................................. (b) The diagram shows a cross-section through a wire placed between two magnetic poles. The wire carries electric current into the page at X. The shape of the magnetic field is shown.

(i) Add arrows to any two lines to show the direction of the magnetic field.

(1) (ii) Draw an arrow on the diagram to show the direction of the force on the wire. Label this arrow F.

(2) (c) Describe the magnetic field in the region inside the dotted square.


(2)

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Cars have a number of features that make them safer in a collision.

(a) Apart from seat belts, name two safety features that reduce the risk of serious injury in a car crash.

(2)

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(b) Photograph A shows a person wearing a seat belt.

Photograph A

(i) Using ideas of momentum and force, explain how a seat belt reduces the risk of serious injury in a

car crash. (4)

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(ii) Photograph B shows a full-body harness used in a racing car.

Photograph B

Suggest why a full-body harness is used in a racing car, instead of an ordinary seatbelt.

(1)

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(c) Photograph C shows a crash-test dummy in a car. The car has crashed into a concrete wall.

Photograph C

State what happens to the momentum of the car during the crash.

(1)


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(a) A student wants to find the refractive index of a glass block.

(i) Draw a diagram to show how the student should set up the apparatus needed to find the refractive

index of a glass block.

Label your diagram.

(2)

(ii) What measurements should the student take to find the refractive index of the glass block?

(2)

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(iii) Describe how the student should use these measurements to find the refractive index of the glass.


block (2)

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(b) The diagram shows a section through a bicycle reflector.

A ray of light is incident on the flat surface of the reflector.

(i) The critical angle for the plastic of the reflector is less than 45°.

Continue the incident ray on the diagram to show the path of the ray until it emerges from the plastic.

(2)


(ii) What happens to the incident ray as it enters the plastic?

(1)

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(Total for Question 4 = 9 marks)

Q5.

A laptop battery charger contains a step-down transformer.

(a) The number of turns on the primary coil of a step-down transformer is

(1)

A the same as the number of secondary turns

B more than the number of secondary turns

C less than the number of secondary turns

D zero

(b) This transformer is designed to reduce the voltage from 230 V to 12 V.

The primary current is 0.25 A. (i) State the equation linking primary voltage, primary current, secondary voltage


and secondary current for a transformer. (1)

(ii) Calculate the secondary current, assuming that the transformer is 100% efficient.

(2)

Secondary current = ........................................................... A (c) A student notices that the charger becomes warm when it is working.

Suggest how this will affect the output of the transformer. (2)

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(Total for question 5 = 6 marks)


Q6.

The diagram shows some of the parts of a nuclear power station.

Describe the process of controlled fission of U-235 in the nuclear reactor.

(6)

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Q7.

A signal generator produces sounds from a loudspeaker.

(a) (i) Which property of the sound wave should be increased in order to make the sound louder?

(1)

A amplitude

B frequency

C speed

D wavelength (ii) Which property of the sound wave should be increased in order to make a higher pitched sound?

(1)

A amplitude

B frequency

C speed

D wavelength

(b) Sound waves travel as longitudinal waves.

Other waves are transverse. (i) Give an example of a transverse wave.

(1)

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(ii) Describe how the vibrations of longitudinal waves and transverse waves differ.

(2)

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Q8.

The photograph shows an investigation of static electricity.

A teacher rubs a balloon with a cloth so that the balloon gains a positive charge.

She then holds the balloon close to her head, and her hair rises.

(a) Explain, in terms of moving charges, how the balloon becomes positively charged.

(2)

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(b) Explain why the teacher's hair rises.

(2)

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(c) Suggest why the charge remains on the balloon even when it is being held.

(1)

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(d) Suggest why the experiment does not work so well when the air is humid (damp).

(1)

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( Total marks for the paper 60 marks )

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