Student's Assessment Number..........••
THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA
FORM TWO NATIONAL ASSESSMENT
031 PHYSICS
Time: 2:30 Hours Year: 2021
Instructions
I . This paper consists of sections A, B and C with a total of ten (10) questions.
2. Answer all questions in the spaces provided.
3. Section A carries thirty (30) marks, section B fifty (50) marks and section C carries twenty (20) 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 assessment room.
6. Write your Assessment Number at the top right corner of every page.
7. Where necessary the following constants maybe used:
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CHECKER'S INITIALS |
SECTION A (30 Marks)
Answer all questions in this section.
1. For each of the items (i) -(xx), choose the correct answer from among the given alternatives and write its letter in the box provided.
(i) What is the name given to the people who study and work professionally in the field which relates matter and energy?
(ii) Which of the following experiments is the process of assigning numbers in measurement?
(iii) What is the implication of the statement that when a body floats, its apparent weight is zero?
(iv) Why particles in a solid state are closely packed?
(v) Why do beans seem to swell up when soaked in water for overnight?
(vi) Which statement correctly explains the term power?
(vii) Which of the following materials was the earliest natural magnet to be discovered?
(viii) What differentiates a single moving pulley from a single fixed pulley?
(ix) Which quantity describes the temperature at which pure ice melts at standard atmospheric pressure?
(x) What criterion supports the argument that potential and kinetic energies are similar?
(xi) Why do the racing cars designed in such a way that their centres of gravities are lowered?
(xii)What happens when the body moves with a constant speed?
(xiii) Which class of levers do wheel barrows, nut-crackers and bottle openers belong?
(xiv) How would the formation of image in the plane mirror be described?
(xv) What parameter (s) affects the magnitude of the energy of a moving body?
(xvi) The following observations are correct on the concept of structure and properties of matter except
(xvii) Why the weight of a body is greater at the poles than at the equator?
(xviii) Which of the following devices work by the help of atmospheric pressure?
(xix) What is the function of a capacitor in electronic devices?
(xx) The amount of current flowing in the circuit is 4.0 Amperes. If a potential difference is 48 V. what is its resistance?
2. Match the descriptions of the magnetic terms in List A with the correct magnetic terms in List B by writing a letter of the correct response below the corresponding item number in the table provided.
List A | List B |
(i) Keep magnet away from the source of heat. (ii) The substance which cannot be magnetized or attracted by magnet. (iii) The point in which the magnetic field is zero. (iv) The region around magnet which can attract magnetic materials. (v) The arrangement of magnetic dipoles in groups. |
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3.Complete each of the following statements by writing the correct answer in the space provided.
(i) Quantities like length, mass, amount of current and time in Physics are known as . . . . . . .
View Ans(ii) The velocity ratio of a block and tackle pulley system which contains 3 fixed and 2 movable pulleys is . . . . . . . . .
View Ans(iii) If a force of 12 N acts on a body of 1.2 kg, the acceleration of a body will be . . . . . . . . . . .
View Ans(iv) The instrument used to detect and identify the presence of electric charges on an object is known as . . .. . . . . . . .
View Ans(v) During respiration, oxygen enters into blood stream by the process known as . . . . . .
View Ans4. (a) Briefly, explain the following terms:
(b) State the principle of conservation of energy.
View Ans(c) A bus of 10,000 kg is traveling from Musoma to Mwanza with a speed of 25 m/s. Calculate its kinetic energy.
View Ans5. (a) 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.
View Ans(b) State the principle of the conservation of linear momentum.
View Ans(c) A ball of mass 0.15 kg moving at a speed of 20 m/s increases the speed to 80 m/s in 0.5 second. What is the average force applied.
View Ans6. (a) Why efficiency of a pulley system is always less than 100%? Give two reasons.
View Ans(b) Draw diagrams of lever system to show:
(i) First class lever.
(ii) Second class lever.
(iii) Third class lever
View Ans7. (a) How does static equilibrium differ from dynamic equilibrium?
View Ans(b) Why mechanics prefer to use a spanner of longer stem than spanner of shorter stem to tight or loosen a nut on a bolt?
View Ans(c) The moment of a force about a point is 12,000 Nm. If the magnitude of the force is 6,000 N, find the perpendicular distance between the point and the line of action of the force.
View Ans8. (a) Use the concept of pressure to explain why buildings are constructed with wide foundations.
View Ans(b) Mention two experiments which show the evidence that atmospheric pressure exists.
View Ans(c) A woman of mass 64 kg is standing on sand soil with high heel shoes of area 2 cm2;
(i) Find the pressure exerted by the woman on the ground.
(ii) Why does her heel sink into the ground?
View Ans9. (a) Write down three equations of uniform acceleration of motion and explain the meaning of each symbol used in the equation.
View Ans(b)The football P of mass 0.5 kg was kicked by a goalkeeper at 12 m/s and collides with another football Q of mass 0.45 kg which was at rest. After the collision both balls move off together at 10 m/s. Calculate:
(i) The momentum of ball P before collision
(ii) The momentum of ball P after collision
View Ans10. (a)State any two important requirements for a complete circuit.
View Ans(b) Distinguish between resistance and resistors.
View Ans(c) Draw a simple circuit to show two bulbs in series connected to a battery of two cells.
View Ans