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2003 PHYSICS 1
SECTION A (20 marks)
Answer all questions in this section.
1. For each of the following items (i)-(x) choose correct answer from among the given alternative and write its letter among beside the item number.
(i)A bus carrying a very big load on its carrier cans easily over turn because
A It cannot run fast B It Librium stable C It is center of gravity is low. D It is more stable and can run faster E its center of gravity is high
(ii)When an object moves around a horizontal circle of center O with constant speed its acceleration will be?
A 0 B Towards the center C Away from the center D Along from the tangent to the circle E Along the direction of floatation
(iii)A bar of copper is heated from 293K to 333K .I identify a false stament the following
A Its density will increase slightly B its density will be slightly C it is electrical conduction will decrease slightly D its mass will not change. E its weight will remain unchanged
(iv)The direction of the heat flow between two bodies is determined by
A The direction of the wind B The mass of each body C The temperature defined D The coefficient of cubical expansion of the bodies. E The coefficient of linear expansion of the body
(v)Refractive index of glass block can no be evaluated from the following ratio
A sin I or sin r B Velocity of light in air to velocity of light in glass C frequency of light in air to frequency of light in glass D Wave length of light in air h to wave length of light in glass E real depth to apparent depth
(vi)Which of the following is not the property of magnetic line of force due to a bar magnetic?
A They have direction from North to south pole outside the magnet B They do not exist inside the magnet C They have direction from North Pole to South Pole inside the magnet D They tend to close inside but wider outside the magnet E They form complete loops.
(vii) When charging a body by friction. The particles which are transferred are
A proton B nuclei and proton C nuclei D electrons E protons and electrons
(viii)Which of the following statement is correct?
A Electrons but not x-ray are defracted by magnetic field B Electrons and X-ray are both particles
C Electrons are defracted by Electronic field but not electronic field D Electrons are Earth particles
E Electrons and X-ray are both defracted by magnetic field
(ix)Cathode rays are
A A stream of energy B Used to examine a complete machine without dismantling it C A string of molecules D A string of electrons E Used to detect flaws and cracks in metal casting and welded
(x)A transistor is a device which
A Amplifies alternating current or voltage B Amplifies direct current voltage C Rectifies direct current or Voltage D Amplifies and rectifies the alternating current or voltage E Rectifies alternating current.
2. Match the item in list A with the responses in list B by writing the letter of the correct response beside the item number. Each item carry one mark.
List A
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List B
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(i) Newton meter NM
(ii) Reverberation
(iii) Longitudinal waves
(iv) No evidence of having an atmosphere
(v) Neutral point
(vi) Motor
(vii) β -radiation
(viii) Angle between magnetic North and geographical
North direction at the place concerned.
(ix) Originate from the nuclei of an atom
(x) n-type semiconductor
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A Planet Jupiter
B Has donor Impurities
C Angle of variation
D A tone heard when a turning fork is
sounded
E Gamma rays
F Work done
G Application of momentum change
H Basic physical quantity
I A point in Magnetic field
where resultant field is zero
J Planet Mercury
K Control temperature change
L Sound waves
M Prevent weakening of bar magnets
N Converts electrical energy into mechanical energy
O The multiple reflection
of a sound waves when they are replaced in a closed room or cavity
P Deflected by magnetic and electric field
Q Paper thickness control
R Has acceptor impurity
S Rise and fall of sound of two vibrating
objects
T Angel of variation
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SECTION B (60 marks)
Answer all questions in this section
3. (a)Define the following terms
(i)Acceleration
(ii)Power
(iii)Newton
(b)State Newton‘s second and third laws of motion
(c) A 50 g mass is placed on a straight track sloping on an angel of 45 to the horizontal as shown in the figure 1 below. Calculate
(i)The acceleration of the load as it slides down the slope
(ii)The distance moved from rest in 0.2 seconds
DIAGRAM SPACE
4.( a)A thermometer is directly dipped in to the beaker containing boiling water.
(i)What does the thermometer measure?
(ii)What is the liquid in the thermometer?
(iii)What liquid will be used to measure a temperature of about -80 ?
(b)State what changes, if any, take place in the following
(i)Melting point of ice when salt is added to the ice
(ii)The volume of water it fit changes into ice
(iii)The boiling point of a liquid when the pressure on the liquid is reduced
(c)A 50 watt heater is immersed in a 2kg block of aluminum which also is holds a thermometer. The temperature of the block rises by 8K in 5 minutes. Neglect the heat losses; calculate specific heat capacity
5.(a) Explain, with ray diagrams, the use of lens
(i) as a magnifying glass
(ii)in a camera
(b)State the characteristics of the image formed in 5.(a above)
(c)The distance between the film and the length camera is 6.25 cm when it is focused on an object of 1.5m from the length. How far must the lens be moved, and in what direction, in order to focus the camera on the distant object.
6.(a)State the defects of a simple cell and explain how these defects may be minimized.
(b)Explain briefly what the fuse is.
(c)Select the best fuse for the following:
(i)A refrigerator rated 250 V, 400W
(ii)The electric cooker rated 240V, 7.2Kw
(iii)The electric iron rated 240 V, 2 kW
7.(a)Why is high Voltage used for commercial transmission of electrical energy?
(b)What is electromagnetic induction?
(c)Fig 2 below shows two coils X and Y is connected to battery and Y is connected to a center zero galvanometer G.
DIAGRAM SPACE
(i) Sate and explain the deflection of the galvanometer needle when the switch K is closed for a few seconds and then opened.
(ii) Why must the galvanometer be a center zero type?
(iii) What would be done in X to increase the current induced in circuit Y?
8.(a) Write two properties of
(i)X-rays
(ii)Cathode rays
(b)(ii)Give any four uses of cathode ray oscilloscope (CRO)
(ii)State two ways in which X-rays differ from gamma rays.
(d) A particular radioactive has half life of 2.0 hours. A sample gives a count of 2400 per second at 11:00 am. When will the count have dropped to approximately 300 per second in the same counting system?
SECTION C (20 marks)
Answer TWO (2) questions from this section
9.(a) Define Impulse and state its SI unit.
(b)A volleyball A of mass 0.3 kg is moving on the ground at a speed of 4m^-1 towards a football B which is at rest on the ground and has a mass 0.8 kg.When A collides with B,moves forward with a velocity of 1.8ms^-1. Find
(i)The velocity of A after the collision
(ii)the average force of A and B during the collision
(c)Explain about total Kinetic Energy of the system before and after the collision
10. (a) Distinguish between
(i)Comet and Asteroid
(ii)Star and Planet
(iii)Meteoroid and Meteor
(b)State what is meant by
(i)Heliocentric theory
(ii)Geocentric theory
(c)Mercury planet is 58x10^6 km from the sun and it takes 88 days to complete one orbit around the sun. Calculate the speed of the planet in km/hr to significant figures.
11.(a)Define the following terms:
(i)Transistor
(ii)Dopping
(iii)Rectification
(b)What are the differences between a conductor, a semiconductor and an insulator in terms of their energy band.
(c)Draw a circuit diagram of the full wave rectifier using only two diodes.
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