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535/2PHYSICSPAPER22 hours

Uganda Certificate of Education

MOCK EXAMINATIONS 2010

PHYSICS

Paper 2

2hours 15 minutes

INSTRUCTIONS TO CANDIDATES:

Attempt anyFIVEquestions.

Mathematical tables, slide rules and silent non-programmable electroniccalculators

may be used.

These values of physical quantities may be useful to you;

Acceleration due to gravity = 10ms -2

Specific heat capacity of water = 4200 Jkg-1k-1

Speed of light in vacuum = 3.0x108ms-1

Speed of sound in air = 330ms-1

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Turn over2008

1. (a) Define the terms:

(i) Mechanical advantage

(ii) Velocity ratio

(b) A pulley system of velocity ratio 4 is used to raise a load of 16kg.An effort of 50N is applied for 40 seconds to have the load

through 1.2m.Calculate

(i) The mechanical advantage

(ii) The efficiency of the machine

(iii) The power developed by the effort

(c) Explain the effect of oiling the pulley system on the following

(i) Velocity ratio

(ii) Mechanical advantage

(iii) Efficiency

(d) State two applications of pulley systems.

2. (a) Distinguish between ductile and brittle materials.

(b) (i) State Hookes Law.

(ii) Describe an experiment to demonstrate Hookes law for a

spring.

(iii) A force of 160N stretches a helical spring by 72mm.Calculate the

extension produced when a mass of 12kg is hung on thesame spring.

(c) In an experiment to verify Hookes law using a spring the

following resultswere obtained.

Load (N) 0.0 0.2 0.4 0.6 0.8 1.0Extension(mm)

110 120 130 140 150 180

(i) Plot a graph of extension against the load.

(ii) From the graph determine the extension when the load is0.5N.

3. (a) (i) What are Cathode rays?

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(ii) State two properties of Cathode rays.

(b) (i) Draw a well labeled diagram of a cathode ray oscilloscope

(CRO).

(ii) State one function of each of the parts labeled in b(i)

above.

(iii) Give one use of the C.R.O.

(c) (i) Distinguish between hard and soft x-rays.

(ii) Briefly explain how x-rays are produced (diagram notrequired).

4. (a) (i) What is a primary cell?

(ii) State any one source of e.m.f. other than a cell.

(b) (i) Draw a well-labeled diagram to show the essential featuresof a

simple cell.

(ii) State two defects of a simple cell and explain how they areminimized.

(c) 24V

6 A

8

12

The diagram above shows resistors of 6, 12 and 8connected

across a cell of e.m.f. 24V. Determine:

(i) The reading of the ammeter, A.

(ii) The p.d. across parallel combination

(iii) The power in the 6 resistor.

(d) Give one advantage of transmitting electricity at higher voltages.

5. (a) (i) What is meant by the term neutral point as applied in

magnetism?

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(ii) Sketch the resultant magnetic field pattern for a barmagnet with its

North pole pointing North in the earths magnetic field.

(b) Use the domain theory to explain the following;

(i) Magnetic saturation

(ii) Demagnetization

(c) (i) State Lenzs law of electromagnetic induction.

(ii) With the aid of a labeled diagram describe how an a.cgenerator

works.

(iii) Sketch the variation of e.m.f generated with time for thegenerator

in c(ii) above.

(iv) State the modifications which can be made to convert the

a.c.generator to a d.c. motor.

6. (a) (i) State the laws of reflection.

(ii) Distinguish between regular and diffuse reflection.

(b) Describe an experiment to show that light travels in a straightline.

(c) An object 10cm high and at right angles to the principal axis of aconvex

mirror is 24cm from the pole. If the focal length of the mirror is

6cm, by use of a scale drawing:

(i) Determine the image distance.

(ii) Calculate the magnification of the image in (c) (i) above.

(iii) Give one application of a diverging mirror.

(iv) Give one difference and one similarity, between a lenscamera and

a human eye.

7. (a) (i) Define the term temperature.

(ii) State one advantage of mercury over alcohol as athermometric

liquid.

(b) Differentiate between evaporation and boiling.

(c) (i) State Charles law.

(ii) Describe a simple experiment to verify Charles law.

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(d) A fixed mass of a gas at constant pressure has volume of1300cm3 at

27oC. Find its volume when the temperature rises to 100oC.

8. (a) (i) Define the term amplitude.

(ii) A water wave moves from shallow to deep water. What

effect would this have on its frequency and wavelength?

(b) (i) What is reverberation?

(ii) Mention any one importance of reverberation.

(iii) Describe an experiment to determine the speed of soundin the air

by the echo method.

10 cmA B

150 cm

The diagram above illustrates water waves in a ripple tank.If the wave particles at A take 4 seconds to move from point A

to B,determine:

(i) the wavelength (ii) the amplitude

(iii) the frequency (iv) the speed of the wave

(d) (i) what is interference?

(ii) Distinguish between constructive and destructiveinterference.

END.

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