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535/1

PHYSICS

PAPER 1

Nov./Dec. 2003

2¼ hours

 

 

UGANDA NATIONAL EXAMINATION BOARD

Uganda Certificate of Education

PHYSICS

Paper 1

Time: 2¼ hours

 

 

 

 

ecolebooks.com

UNEB QUESTIONS

2003. P-1 . SEC-A

1.(03.A.Q:1) The gradient of a velocity-time graph represents the

a. Speed of the body b. Velocity of the body

c Acceleration of the body d. The distance covered by the body

 

2.  (03.A.Q:2) A Newton is defined as the

a)unit of force

b) force which produces an acceleration of 1ms-2

c) force which gives a mass of 1 kg an acceleration of 1ms-1

d) force which gives any mass an acceleration of 1ms-2

 

3. (03.A.Q:3) An object thrown from an airplane reaches a constant velocity known as terminal velocity because the

a)weight of the body at a given place does not vary

b) some of the up thrust and the viscous force will be equal to the weight of the body

c) some of the up thrust and the viscous force on the body is constant

d) up thrust experienced by the body is constant

 

4. (03.A.Q.4) pressure in a liquid is independent of the

a)density of the liquid

b) depth below the surface of the liquid

c) pressure exerted on the surface of the liquid above

d) cross-sectional area and the shape of the vessel containing the liquid

 

5. (03.A.Q.5) the diagram in the figure shows a uniform half-meter rule suspended at point C.

Image From EcoleBooks.com

the mass of the rule is

a) 0.020kg b) 0.025kg c) 0.100kg d) 0.125kg

 

6. (03.A.Q.6) the interval between the ice and steam points on a thermometer is 192mm. Find the temperature when the length of the mercury thread is 67.2mm from the ice point.

a)32.80C b)35.00C c)65.00C d)67.20C

 

7. (03.A.Q: 7) what energy changes take place when a switch of the electrical bell is pressed?

Image From EcoleBooks.comImage From EcoleBooks.comImage From EcoleBooks.comImage From EcoleBooks.comA. Chemical electrical kinetic magnetic sound

Image From EcoleBooks.comImage From EcoleBooks.comImage From EcoleBooks.comImage From EcoleBooks.comB. Chemical electrical magnetic kinetic sound

Image From EcoleBooks.comImage From EcoleBooks.comC. Chemical electrical sound

Image From EcoleBooks.comImage From EcoleBooks.com

D. Electrical magnetic sound

 

8. (03.A.Q.8) which one of the following fluids is the best conductor of heat?

a) Air b) alcohol c) water d) mercury

 

9. (03.A.Q.9) a train traveling at a constant speed of 20m/s over comes at a resistive force of 8KN. The power of the train is

a. (8×20) W b) (8x10x20) W c) (8x100x20) W d) (8x1000x20) W

10. (03.A.Q.10) a rectangular block of metal weighs 3N and measures (2x3x4) cm3. What is the greatest pressure it can exert on a horizontal surface.

a) 5.0x103Nm-2 b) 3.75×103Nm-2 c) 2.5x103Nm-2 d) 7.5×10-1Nm-2

 

11. (03.A.Q.11) A box of dimensions 0.2m by 0.3m by 0.5m is full of a gas of density 200kg/m3. The mass of the gas is

A. 3×10-2kg B. 6.0×100kg C. 2×102kg D. 6.7×103kg

 

12.(03.A.Q.12) when mercury is split on glass it forms small spherical droplets because its

a). Density is high b) surface tension makes its surface elastic c) molecules are small d) cohesive force is greater than adhesive force with the glass.

 

13. (03.A.Q.13) the amount of heat required to raise the temperature of a 0.5kg mass from –50c to 150c is (specific heat capacity of salt solution is 4000 J kg-1K-1)

  1. 8000J b) 20000J c) 40000J d) 160000J

 

14. (03.A.Q.14) the beam in the fig. is being acted on by the weight W.

Image From EcoleBooks.com

 

The regions P, Q and R are respectively,

a) tension, compression, neutral axis

b) neutral axis, compression, tension

c) compression, neutral axis, tension

d) tension, neutral axis, compression.

 

15. (03. A. Q: 15) A pump is rated at 400W. How many kilograms of water can it raise in one hour through a height of 72m?

A. 0.8kg B. 5.6kg C. 33.3kg D. 2000kg

 

16.(03.A.Q.16) In the diagram below, an electron beam XY enters an electric field between plates A and B as shown in the figure.

 

Image From EcoleBooks.com

Which one is the possible route of movement of the electrons?

  1. YS b) YR c) YQ d) YP

 

(03.A.Q.17) Radium nucleus 22698Ra decays to Radon (Rn) by a-particle emission. What is the nuclear equation for this reaction?

Image From EcoleBooks.comImage From EcoleBooks.coma) 22688Ra 3 2He + 22386Rn b)22688Ra 4 2He + 22286Re

Image From EcoleBooks.comImage From EcoleBooks.comc) 42He + 22286Rn 22688Ra d) 22688Ra 22588Rn + 10N

 

(03.A.Q.18) Sound is produced by a source vibrating at a frequency of 50Hz. Given that speed is 330ms-1 in air its wavelength is

  1. 0.15m b) 6.6m c) 380m D) 16500m

 

(03.A.Q.19) In forced vibrations, resonance occurs when the forcing

a) Frequency is equal to the natural wavelength b) velocity is equal to the natural velocity c) frequency is equal to the natural frequency d) frequency exceeds the natural frequency.

 

(03. A.Q.20) which of the following information is true about the concave and convex mirrors.

Concave mirror
convex mirror

a) Converges light diverges light

b) Diverges light converges light

c) Refracts light reflects light

d) Has a wide field of view has a narrow field of view

 

(03.A.Q.21) When a rod is brought close to the cap of a negatively charged gold leaf electroscope and its leaf diverges, it shows that the rod is

a) Negatively charged b) positively charged c) neutral d) partially charged.

 

(03.A.Q.22) Which of these factors affect the magnitude of force on a current-carrying conductor in a magnetic field?

(i) The direction of current (ii) the amount of current (iii) the direction of the magnetic field (iv) the strength of the magnetic field

a) (i) and (ii) b) (ii) and (iii) c) (i) and (iii) d) (ii) and 9iv)

 

(03.A.Q.23) Two resistors of 2 ohms and 3 ohms are connected in series with a 10 volt battery of negligible internal resistance. The potential difference across a 3 ohm resistor is

a) 2v b) 5v c) 6v d) 10v

 

(03.A.Q.24) Which of the following is true about both alternating current and direct current?

(i) Cause heating (ii) can be stepped up or down with transformer (iii) Can be used to charge a battery

a) (i) only b) (i) and (ii) c) (ii) and (iii) d) (i), (ii), (iii)

 

(03.A.Q.25) A transformer connected to 240v a.c mains is used to light a 12v 36w lamp. What current does the lamp draw?

a) 20.0 A b) 6.7 A c) 3.0 A d) 0.33A

 

(03.A.Q.26) The ticker tape shown in the figure was pulled through a ticker timer which makes 50 dots per second.

 

 

 

Image From EcoleBooks.comImage From EcoleBooks.comImage From EcoleBooks.com E 10cm F

Image From EcoleBooks.com
.
. . . . .

Image From EcoleBooks.com

The speed at which the tape was pulled is

a)10cm s-1 b) 25cm s-1 c) 50cm s-1 d) 100cm s-1

 

 

Image From EcoleBooks.com(03.A.Q.27) 6N

 

Image From EcoleBooks.com X

Image From EcoleBooks.comImage From EcoleBooks.com 8N 16N

 

The diagram in the figure shows 3 forces of 8N, 6N and 16N acting on a particle X. the magnitude of the resultant force is

a)  10N b)  14N c)  18N d)  30N

 

(03.A.Q.28) the energy transformations involved in a bicycle dynamo is

a)  electrical to chemical b)  potential energy to chemical energy

c)  chemical to light energy d)  kinetic energy to electrical energy.

 

(03.A.Q.29) A tin containing 5 litres of paint has a mass of 8.5kg. the mass of the empty tin is 2.0kg,. the density of the paint is

a)  1.3kg m-3  b)  1.3×103kg m-3 c)  1.7×103kg m-3 d)  2.1×103kg m-3

 

(03.A.Q.30) the graph in the figure shows being heated from –100c to 1000c. At what point does the substance have maximum density?

 

Image From EcoleBooks.com

 

a) E b) C c) D d) B

(03.A.Q.31) Which of the following statements is incorrect when a tin containing air tightly sealed is heated?

a)  the average speed of molecules increases

b)  the molecules of air hit the walls of the tin harder

c)  The molecules of the air strike the walls of the tin less often.

D)  The pressure inside the tin decreases.

 

(03.A.Q.32)  An object is said to be behave elastically when

a)  its elastic limit is exceeded

b)  its breaking point is reached

c)  equal increases in the force applied to it produce equal changes in length

d)  the potential energy stored in it is used to permanently deform the object.

 

(03.A.Q.33) A 100g quantity of water at 240c is added to 50g of water at 360c. the temperature of the mixture is

a)  280c b)320c c)300c  d)340c

 

(03.A.Q.34) which one of the following parts of the cathode ray tube form the electron gun?

a)  cathode, metal anode, heater, grid

b)  grid, metal anode, cathode, Y-plates

c)  cathode, grid, heater, X-plates

d)  cathode, metal anode, grid, heater, X-plates, Y-plates

 

(03.A.Q.35) A piece of white cloth viewed through a blue glass looks blue because

a)  Blue light is absorbed by the glass

b)  the glass adds blue light to the light coming from the cloth

c)  the glass transmits only blue light and absorbs all other colours

d)  the colour of the glass is reflected onto the cloth

 

(03.A.Q.36) A bulb is rated 40v, 60w. Find its resistance

a)  0.25Ω  b)  410Ω c)  120Ω d)  960Ω

 

(03.A.Q.37) Uganda electricity board charges sh.90 per Kilowatt-hour of electrical energy consumed. What is the total cost of operating 4 light bulbs rated at 100w for 5 hours.

a)  sh.11.25  b)  sh.45 c)  sh.180  d) sh.180,000

 

(03.A.Q.38) A current of 2 A flows through a coil of resistance 3 ohms for one minute. How much energy is converted into heat

a)  6J b)  12J c)  360J  d)  720J

 

(03.A.Q.39) The process of using a material of low thermal conductivity to prevent heat loss is called

a) cooling b) lagging

c) absorption d) contraction

 

(03.A.Q.40) when air is pumped in a tube at a constant temperature, the pressure increases because

a) the molecules are larger

b) the molecules are moving faster

c) the molecules are closer together

d) more molecules are hitting the tube.

 

UNEB 2003 SECTION B PAPER 1

(03.A.Q.41)  a)  What is a vector quantity?

b)  The figure shows the resultant R of two forces P and Q. R makes an angle of 600 with a horizontal and P is 50N.

 

 

Image From EcoleBooks.com

 

Find the magnitude of (i) Q (ii) R

 

(03.A.Q.42)  a)  State the principle of flotation?

b)  A cube of edge 0.1m floats in a liquid of density 1200kgm-3 with 1/3 of it submerged, find the density of the material of the cube.

 

(03.A.Q.43)  a)  State any two factors which affect pressure in liquids.

b)  The diagram in figure 8 below shows an instrument used for measuring gas pressure in a laboratory. Find the pressure in Nm-2 of the gas if atmospheric pressure is 76cm Hg [density of mercury =13.6×103kgm-3]

 

Image From EcoleBooks.com

 

(03.A.Q.44)  a)  Name any two physical properties which change with temperature.

b)  Convert a temperature of 250c to Kelvin.

c)  Explain why evaporation causes cooling.

 

(03.A.Q.45)  a)  What is meant by efficiency of a machine?

b)  draw a single pulley system of velocity ratio 3.

c)  State one reason why the efficiency of a machine is always less than 100%.

 

(03.A.Q.46)  a)  Explain briefly how a calendar which operates on a 6.0 V d.c can draw power from a 240 volts main supply. b) State two sources of energy loss in a transformer.

 

(03.A.Q.47)  A positively charged rod is brought near two conducting spheres A and B in contact as shown in the figure.

Image From EcoleBooks.com

 

a)  show the charges on the spheres.

b)  Describe how the spheres can be given a permanent charge .

(03.A.Q.48)  a)  State two conditions for total internal reflection.

b)  Draw a diagram to show how a fish in water attains a wide field of view.

 

 

(03.A.Q.49)  Two identical loud speakers A and B are placed near each other as shown in the figure. The speakers vibrate with same frequency

Image From EcoleBooks.com

Explain what will be observed on a sound detector moved from N to M

 

(03.A.Q.50)  a)  what is meant by radioactivity?

b)  A radioactive material takes 50 hours for 93.75% of its mass to decay. Find its half life.

 

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