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535/1

2¼ hours

 

UGANDA NATIONAL EXAMINATION BOARD

Uganda Certificate of Education

PHYSICS

Paper 1

Time: 2¼ hours

 

SECTION A

1.   In which of the following devices is kinetic energy converted electrical energy?

A.  An accumulator B.  A dynamo

C.  An electric motor D.  A combustion engine

 

2.  An air bubble is introduced at the bottom of a jar containing mercury. Which one of the following explains what will happen to the bubble? It will

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A.  Be pressed by the mercury column above and will burst.

B.  Rise to the surface of the mercury while decreasing in size.

C.  Rise to the surface of the mercury while increasing in size.

D.  Remain in constant motion within the mercury.

 

3.  When water spreads on a glass plate, the forces between its molecules and the glass molecules are due to

A.  Surface tension B.  adhesion

C.  cohesion   D.   viscosity

 

4.  Which of the graph below best describes the motion of a stone which falls freely from a height of 20 m?

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5.  Two forces of 4N and 3N act at a point at right angles to each other. Find the magnitude of the resultant force

A.  1N B.   5N C.  7N D.  12N

 

6.  A car is uniformly accelerated from rest and after 10s acquires a speed of 20ms-1. How far does it move during the eleventh second?

A.   20m B.   21m C.  100m D.  121m

 

7.  A stone of mass 2.5g is thrown with an average force of 5.0N. Find the average acceleration in ms-2

A.   5.0 x 10-4  B.  2.0 x 10-3 C.  1.25 x 102  D.  2.0 x 103

 

8.  An object of mass 2kg moving at 5ms-1, collides with another object of mass 3kg which is at rest. Find the velocity of the two bodies if they stick together after collision

A.  1.0ms-1  B.  2.0ms-1  C.   2.5ms-1  D.  5.0ms-1

 

9.  A bullet of mass 5g is fired at a speed of 400ms-1. How much energy does it have?

A.   1/2 x 5 x 102x 400J B.  1/2 x5 x 103x400J

C.  1/2 x 5 x 10-3 x 400 x 400J  D.  1/2 x 5 x 102x400x 400J

 

10.  A stone is released from a height of 20m above the ground. Find its height above the ground when its speed is 10ms-1

A.  5m B.  10m C.  15m D.   20m

 

11.  A heater with a power rating of 100W is placed in 0.5kg of ice at 0oC. How long will it take the heater to melt all the ice? (Specific latent heat of fusion of ice=3.34×105Jkg-1)

A.  1.67×10-3s  B.   1.67×103s C.  3.34×10-3s  D.  3.34×10-3s

 

12.  Calculate the increase in pressure which a diver experiences when he descends 30m in the sea water of density 1.2×103kgm-3

A.  3.0 x 102Nm-2 B.  1.2 x 104Nm-2

C.  3.6 x 104Nm-2 D.  3.6 x 105Nm-2

 

13.  Three of the fundamental physical quantities are

 A.  density, mass and time.  B.   Length, time and mass

 C.  length, time and weight  D.   volume, temperature and mass

 

14.  The pressure exerted by a gas decreases when its volume is increasing at a constant temperature because the molecules

A.  move faster   B.   move closer to one another

C.  hit the walls more often  D.   hit the walls less frequently

 

15.   The diagrams below show the possible shapes of water dams.

Image From EcoleBooks.com

Which shape(s) is /are preferable?

A.  (i) and (ii) only B.   (ii) and (iii) only  

C.  (i) and (iii) only D.  (iii) only

 

16.  Which of the following is true for an object under shearing forces? A.  the object does not change in shape

B.   the layers of the object tend to slide on one another

C.  the object gets twisted.

D.  the object tends to shorten

17.

Image From EcoleBooks.com

In the above circuit, what is observed on the oscilloscope when the time base is on?

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18.  Isotopes are nuclides with the same number of

A.   protons but different number of electrons.

B.  protons but different number of neutrons

C.  neutrons but different number of protons

D.  electrons but the same number of neutrons

 

19.  Two alpha particles are produced when an unknown particle x is used to bombard lithium 73Li as shown in the equationImage From EcoleBooks.com
73Li+x42He +42He. What is x ? A.  A beta particle B.  An alpha particle  

C.  A neutron D.   A proton

20.  A radioactive metal decays to 1/16 of its original quantity in 2 hours. What is its half life? A.  15 min B.   24min  C.  30min D.  40min

21.  The particles of the medium through which a longitudinal wave travels A.  vibrate parallel to the direction of the propagation of the wave

B.  vibrate perpendicular to the direction of the propagation of the wave

C.  move along with the wave

D.  move in the opposite direction to the wave.

22.  A girl standing 300m away from a high vertical wall makes a loud sound of frequency 600Hz. Calculate the wave length of the sound wave if the girl hears the echo after 2s. A.  0.2m B.   2.5m  C.  5m D.  10m

23.  A point object is 10cm in front of a plane mirror. When the object is moved 4cm towards the mirror, what is the distance between the object and the image?   A.  6cm B.   8cm  C.  10cm D.   12cm

24.  A ray of light PQ is incident on the face AB of a glass prism ABC as shown in the diagram in the figure below.

Image From EcoleBooks.com

Which one of the rays R, S, T, U indicates the correct direction of the emergent ray? A.  R B.  S  C.   T D.  U

 

25.  The difference between hard and soft X-rays is that A.  hard X-rays travel faster than soft X-rays  

B.  hard X-rays penetrate more than soft X-rays

C.  hard X-rays are less dangerous than soft X-rays

 D.  soft X-rays are produced at high potential differences

26.  When a plastic rod is brought near a charged electroscope, the gold leaf is seen to diverge more. The possible charges on the rod and the electroscope are

 

Electroscope

Plastic rod

positive

negative

negative

positive

negative

negative

positive

uncharged 

27.  Which one of the following shows the correct distribution of electric charges generated in clouds due to violent movements within the thunder clouds?

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28.  In a simple cell

A.  polarisation is caused by impure zinc

B.  potassium dichromate is used to prevent polarisation

C.  the formation of hydrogen bubbles on the copper plate causes local action.

D.  hydrogen is produced on the zinc plate and causes polarisation

29.

Image From EcoleBooks.com

The voltage supply in the circuit in the above figure is (a) 0.25V (b) 4.0V (c) 25V (d) 250V

30.  To determine the value of resistor R, a voltmeter, a rheostat and an ammeter must be connected in the gaps X, L and M as shown in the figure below

Image From EcoleBooks.com

Which one of the following arrangements gives the correct circuit ?

 

Voltmeter  

rheostat  

ammeter  

Ammeter  

voltmeter  

rheostat 

rheostat  

voltmeter  

ammeter 

Ammeter

rheostat  

voltmeter 

31.   A transformer has twice as many turns in the secondary coil as in the primary coil. The a.c input to the primary is 4V. find the output

A.   2V B.  4V C.   8V D.  16V

32.  The figure below shows a transmission line from a power station to a consumer several kilometres away.

Image From EcoleBooks.com

Which one of the following is the correct type of transformers at P and Q

P QAstep-upstep-up Bstep-down step-down Cstep-up step-down Dstep-down step-up
33.  4 bulbs each rated at 75 W operate for 120 hours. If the cost of electricity is sh.100 per unit, the total cost in shillings will be
 A.  150 B.  900 C.  3600 D.   7500
34.  Which one of the following diagrams shows a correct magnetic field due to a current flowing in a solenoid?
Image From EcoleBooks.com
In each of the questions 35-40, one or more of the answers given may be correct. Read each question carefully and then indicate the correct answer A, B, C and D according to the following A.  if 1,2, 3 only are correct B.  if 1,3 only are correct
C.   if 2,4 only are correct D.  if 4 only is correct

35.  Which of the following are properties of cathode rays
1.  they travel in straight lines 2.  they darken photographic plates
3.  they are deflected by a magnetic field  4.  they can penetrate a thick sheet of paper

36.  Which of the following statements are true about magnets 1.   magnets always have opposite polarities
2.  A magnet can be used as a compass
3.  Repulsion is the only sure test for a magnet
4.  Magnets attract all metals
37.  
Image From EcoleBooks.com
Which of the following is/are true about the experimental set up in the above figure?
1.  The ice takes long to melt because of the gauze
2.  The wire gauze keeps the ice at the bottom of the test tube.
3.  The ice does not melt because the heating is from above.
4.  The ice takes long to melt because water is a poor conductor.

38.  Which one of the following statements is/are true about heat radiation?
1.  A cold body emits invisible radiation of long wave length
2.  Very hot objects emit radiations of short wave lengths
3.  All good radiators of heat are good absorbers
4.  All radiations emitted by hot objects are invisible.

39.  Which of the following statements is/are true?
1.  A glass prism disperses shorter wave lengths more than longer wave lengths
2.  A glass prism disperses longer wave lengths more than shorter wave lengths.
3.  A red filter only allows red and longer wave lengths in the spectrum to pass
4.  A red filter allows all colours in the spectrum to pass except red.

40.  Which of the following statements is/are true?
1.  An electromagnet is a temporary magnet because it can be activated and de-activated
2.  The strength of the magnetic field increases as the current through a wire decreases
3.  The strength of an electromagnet decreases with the number of turns around the core
4.  The magnetic field lines from the concentric circles above the conductor.

SECTION B
1.  An object of mass 2kg is moving with a velocity of 1ms-1. It is then acted on by a force of5N through a distance of 16m.calculate
(a)  the acceleration produced by the force
(b)  the final velocity of the object
(c)  the work done by the force

2.  (a)  Draw a labelled diagram to illustrate the level principal as applied to a wheelbarrow
(b)  the graph in the figure below shows the variation of the efficiency of a pulley system with load.

Explain why
(i)  Part OA of the graph is almost a straight line.
(ii)  From A, the graph curves and finally levels off before reaching 100%.

3.  (a)  Explain with the aid of a sketch diagram, how a notch weakens a beam of a brittle material (b)  Sate two ways in which concrete may be made stronger.

4.  (a)  Equal volumes of water at the same temperature are poured in a basin and in a jug.
State, giving a reason, which water will evaporate faster?

(b)  What are the functions of the following in a refrigerator
(i)  compressor
(ii)  coiling fins

5.  (a)  Draw a ray diagram to show the formation of an image of an object O placed in front of a convex mirror shown in the figure below. F is the principal focus of the mirror.
Image From EcoleBooks.com
(b)  State two applications of convex mirror

6.  (a)  Explain why a current does not flow between the electrodes in dilute sulphuric acid until a
certain value of p.d is exceeded

(b)  Using the same axes, sketch a graph of current against p.d for
(i)  A torch bulb
(ii)  A carbon resistor

7.  A solid of volume 10-4m3 floats in water ( of density 103kgm-3) with 3/5 of its volume submerged
(a)  find the mass of the solid.
(b)  If the solid floats in another liquid with 4/5 of its volume submerged. What is the density of
 the liquid?
 
8.  (a)  The end Q of a rope is tied to a pole while the end P is moved up and down as shown in the
figure below.
Image From EcoleBooks.com
Sketch the resultant wave pattern between P and Q (b)
Name the type of wave produced in (a) above.
 

  1. Name one musical instrument which produces this type of wave.

 

9.  The figure below shows a charging circuit.

Image From EcoleBooks.com

 

(a)  Name and state the use of each of the parts labelled (i) W (ii) Z

(b)  Sketch the wave form that is obtained from terminals XX.

 

10.  A bar magnet is placed in the earth’s magnetic field with its north pole pointing to the geographical west as shown below.

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(a)  (i)  On the diagram, draw the lines of the resultant magnetic field around a magnet.

(ii)  Mark the neutral point X

(b)  The diagram in the figure below shows a straight wire connected to the terminals of a centre zero galvanometer

Image From EcoleBooks.com

When the wire is moved vertically upwards out of the plane of the paper, the galvanometer deflects

  1. In which direction does the galvanometer deflect
  1. Why does the galvanometer deflect
  2. State one way by which the deflection of the galvanometer can be reversed?

 

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