RESIDENT'S OFFICE
REGIONAL ADMINISTRATION AND LOCAL GOVERNMENTS
MBULU DISTRICT COUNCIL
FORM TWO EXAMINATION MARCH 2023
031 PHYSICS
Time: 2:30 Hours
Instructions
1. This paper consists of sections A, B and C with total of ten (10) questions.
2. Answer all questions.
3. Section A and C carry fifteen (15) marks each and section B carries seventy (70) marks.
4. All writing must be in blue or black ink except drawings which must be in pencil.
5. All communication devices, calculators and any unauthorized materials are not allowed
in the examination room.
6. Where necessary the following constants may be used.
i.
Acceleration due to gravity, g= 10 m/s2
ii.
Density of water ₰= 1g/cm3 or 1000kg/m3
iii.
Standard temperature and pressure (STP) =273K
SECTION A (15Marks)
Answer all questions in this section
1. For each of the items (I) - (x),choose the correct answer from the given alternatives and write
its letter in the answer sheet provided.
i.
What is the relationship between pressure and area?
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A: On decreasing area, pressure decreases.
B: On increasing area, pressure increases.
C: On decreasing area, pressure increases. D: On changing area, nothing happens.
ii.
Materials that allows only part of light to pass through them are called
A: Transparent. B: Translucent. C: Opaque. D: Newton.
iii.
The point where the force of gravity can be considered to act is called
A: Centre of gravity. B: Centre of mass. C: Centre of weight. D: Equilibrium.
iv.
Which of the following materials can magnetically be made strong
A: Nickel and Copper. B: Steel and Brass.
v.
C: Cobalt and Iron. D: Cobalt and Copper.
Which of the following is an example of third class lever?
A: Scissors. B: Fishing pole. C: Pliers. D: Nut cracker.
vi.
A force that prevent a body to slide is called
A: Stretching force. B: Restoring force.
vii.
C: Frictional force. D: Compression force.
A hydrometer is an instrument used to measure
A: The volume of liquids. B: The density of liquids. C: The density of solids
D: The volume of solids.
viii.
The process of removing magnetism from a material is known as
A: Polarization. B: Demagnetization. C: Magnetization.
ix.
The slope under - velocity time graph represents ;
A: Speed. B: Acceleration.
x.
D: Magnetizing.
C: Distance. D: Mass.
What term refers to the stationary accumulation of charges on object?
A: Current electricity. B: Static electricity. C: Charging. D: Polarization.
I
ii
iii
iv
V
vi
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Vii
viii
ix
x
2. Match the item in List A with a correct response in List B by writing the letter of a correct
response on the answer sheet provided.
LIST A
LIST B
i.
Ammeter
A: Coulomb
ii.
Voltage is proportional to current
B: Constant current
iii.
Rheostat
C: Control current
iv.
series connection
D: Ohms law
v.
Charge
E: Measures current
LIST A
i
ii
iii
iv
v
LIST B
SECTION B (70 Marks)
Answer all questions in this section
3. (A) You wake up in the morning and find your classmate at the school kitchen shouting, The
morning porridge is very hot! Its temperature is 350K .What temperature is this on the Celsius
scale?
(B)Your aunt is preparing water for a newborn baby to bath. There are two pots of water which
are equal in mass. One is at 15OC and the other is at 45OC .If the water from the two pots is
mixed so as to get an equilibrium temperature suitable for the baby to bath, what will be the
equilibrium temperature in kelvin after mixing?
(C)A form two student was arguing that temperature is the degree of hotness and coldness of a
body and it is impossible to explain this concept by using the kinetic theory of matter. How can
you refute this argument?
4.(A)On your way back home, you hear two Form Two students arguing that acceleration is a
scalar quantity because it describes the rate of change of speed of an object. How will you
correct their argument?
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(B)Suppose a bird is on the tree at a certain height above the ground and a boy at rest threw a
stone to hit the bird on the tree. If the bird falls and strikes the ground with a velocity of 80m/s:
(i)What will be the height of the bird from the ground?
(ii)Calculate the time taken by the bird to hit the ground
5. (A) Explain the following observation used in Newton’s laws of motion.
(i)Apply the Newton’s first law of motion to explain why an object pulled along the ground
with constant velocity has zero net force but the force exerted on it is not zero.
(ii) Newton pair of forces is equal in magnitude but opposite in direction but they never
cancel each other
(B)A trolley A of mass 6Kg is rolling a smooth horizontal desk with a velocity of 0.8m/s. The
trolley collides with a stationary trolley B of mass 2Kg.After collision the trolley couples and
moves off together in the direction in which A was travelling. Calculate the velocity of the
trolleys after collision.
6. (A) what do you understand by the term ohmic conductor?
(B)State the Ohms law and give the mathematical expression.
(C)An ohmic conductor has a voltage drop of 9V measured across it. The current flowing in
the conductor is 3mA. What is its resistance?
7. (A) A woman of mass 72Kg is standing on sand soil with high heel shoes of area 3m.
(i)Find the pressure exerted by the woman on the ground.
(ii)Why does her heel sink into the ground?
(B)List two experiments that verify atmospheric pressure.
(C)What were the common devices that utilize the atmospheric pressure?
8. (A) Explain the following observation as applied in equilibrium.
(i)Why taller buildings collapses during earth quake but the shorter does not.
(ii) Why the knob on a door is placed as far as possible from the hinges?
(B)A uniform bar AB of height 5m weights 60N.The bar is supported at a horizontal position by
two vertical strings X and Y. If the string X is 0.6m from A and string Y is 1.8m from B. Find
the tension in the string.
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9. (A) State the principle of conservation of energy
(B)A bus of 10000Kg is travelling from Morogoro to Mtwara with a speed of 25m/s.
Calculate it's kinetic energy.
(C)A ball of mass 0.15kg moving at a speed of 10m/s increases the speed to 70m/s in
0.5second.What is the average force applied.
SECTION C (15 Marks)
Answer all questions in this section
10. (A) why efficiency of machine is less than 100%? Give two reasons.
(b)A wheel and axle of efficiency of 80% is used to raise a load of 2000N.If the radius of the
wheel is 50m and that of the axle is 2m. Calculate
(i) The velocity ratio and mechanical advantage of the machine.
(ii) The effort required to overcome the load.
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