FORM TWO PHYSICS NECTA 2014

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL

FORM TWO SECONDARY EDUCATION EXAMINATION

0031 PHYSICS Time: 2:30 Hours Friday, 28th November 2014 a.m.

##### Instructions
1.  This paper consists of sections A, B, and C.
2.  Answer all questions in the spaces provided.
3.  All writing must be in blue or black ink except drawings which must be in pencil.
4.  All communication devices and calculators are not allowed in the examination room.
5.   Write your Examination Number at the top right corner of every page.
6.   Where necessary the following constants may be used:

(i)  Acceleration due to gravity, g = 10 m/s2

(ii)  Density of water = 1 g/cm3 or 1,000 kg/m3

1. For each of the items (i) – (xx), choose the correct answer among the given alternatives and write the letter in the box provided.

An electrostatic machine which produces an unlimited supply of sparks by induction is called

(i) The study of matter in relation to energy is called:

1. Chemistry
2. Physicists
3. Biology
4. Physics

(ii) The force which causes tear and wear between machine parts is known as:

1. friction
2. torsional
3. repulsive
4. magnetic

(iii)  As one goes far away from the earth, the density of air:

1. decreases
2. decreases
3.   remains constant
4. becames greater than its weight (iv)  Ferry boat floats in sea water because its density is:

1. greater than that of water
2. smaller than that of water
3. the same as its weight
4. greater that its weight

(v)  Study Figure 1 below: How far from the pivot must the 150g mass be placed for the system tr be in equilibrium?

1. 16.7cm
2. 17.6cm
3. 36.6cm
4. 26.7cm.

(v)  Study Figure 1 below: How far from the pivot must the 150g mass be placed for the system tr be in equilibrium?

1. 16.7cm
2. 17.6cm
3. 36.6cm
4. 26.7cm.

(vii) The suspended magnetic needle always comes to rest with its axis in a vertical plane called:

1. geographic meridian
2. magnetic meridian
3. geographic declination
4. magnetic declination.

(viii)As the angle between two plane mirrors increases, the number of I images formed:

1. decreases
2. increases
3. remains constant
4. goes to infinity.

(ix)  Which of the following materials do not allow light to pass through?

1. Glass
2. Tinted glass
3. Clear plastics
4.  Human bodies

(x) To view objects that are out of direct vision we can use a

1. telescope
2. microscope
3. periscope
4. slide projector.

(xi)  The process by which water soaks through the cells of rice and beans is called:

1. capillarity
2. cohesion
3. diffusion
4. osmosis

(xii)  Which of the following is a property of mercury •as a thermometric liquid?

1. Boils at 780
2.  Boils at 3600C
3. Wets glass
4. Expands rapidly

(xiii)The area under velocity-time graph represents:

1. distance
2. speed
3. acceleration
4. deceleration

(xiv)  If the pitch of a micrometer screw gauge is 0.5mm, then its thimble has:

1. 10 equal divisions
2. 100 equal divisions
3. 50 equal divisions
4. 500 equal divisions

(xv)  Which of the following is a magnetic material?

1. Copper
2. Cobalt
3. Zinc
4. Brass

(xvi)  An electrostatic machine which produces unlimited supply of sparks by induction is called:

1. Gold leaf electroscope
2. Electrophorus
3. Generator
4. Speedometer

(xvii) The quantity of electric current caused by excess electrons is called:

1. coulomb
2. electric charge
3. electric charge
4. electrification

(xviii)Which of the following is not a sustainable source of energy?

1. Sun
2.  Generator
3. Wind
4. Sea wave

(xix)A temperature Of 680C is equivalent to;

1. A. 20 0
2. 450F
3.  154.40F
4.  90.40F

(xx) Action and reaction are equal in magnitude but opposite in direction. This statement refers to;

1. the law of inertia
2. newtons second law of motion
3. the principle of moment
4. newtons third law of motion

##### SECTION B (40 Marks)

2.  Match each item in List A with a correct response in List B by writing its letter below the number of the corresponding item in the table provided.

 LIST A LIST B Measures how much the position has changed. Measures the net change in position. Rate of change of distance. Rate of change of displacement. The constant rate of change of displacement. Rate of change of velocity. Motion under the effects of gravity. Measures the rate at which position changes. A.  Gravitational acceleration. B.  Average speed. C.  Acceleration. D.  Uniform acceleration. E.  Free-fall motion. F.  Distance. G.  Speed. H.  Speed in metres. I.  Velocity. J.  Uniform velocity. K.  Displacement.

3.  Complete each of the following statements by writing the correct answer in the space provided.

(i)  The product of mass and velocity of a body is called _____________.

(ii)  Claw hammers and pairs of scissors are in which class of levers? ______________

(iii) Weight has the same SI unit as _________________.

(iv) An instrument used to measure pressure of a gas is known as ________________.

(v) The tendency of a liquid to rise in narrow tubes is called __________________.

4. (a) Define the following terms as applied in measurements and give two examples:

(i) Fundamental quantities ______________

(ii) Derived quantities __________________

(b) Figure 2 shows a graduated cylinder containing water before and after a stone is immersed. ##### Figure 2

If the mass of the stone is 50 g, calculate the

(i) Volume of the stone.

(ii) Density of the stone.

5.  (a) (i) List two characteristics of images formed by plane mirrors.

(ii) Giver a reason why the sky appears blue during a clear sunny day?

(b)  Draw the diagram of each of the following:

(i)  Parallel rays of light.

(ii)  Divergent rays of light.

(iii)  Convergent rays of light.

6.  (a) Define the following terms as used in Physics and give their SI units:

(i)  Work

(ii)  Energy

(b) A man lifts a load of 20 kg through a height of 4 m in 10 seconds. Calculate the:

(i)  Work done.

(ii)  Power developed by the man

##### SECTION C (40 Marks)

7.  (a) (i) State the principle of moments

(ii) A uniform half metre rule is freely pivoted at the 20 cm mark and it balances horizontally when a body of mass 30 g is hung at 5 cm mark from one end. Calculate the mass of the rule.

(b)  (i) What is meant by equilibrium?

(ii)  List three applications of equilibrium in daily life.

8.  (a) Define the following terms:

(i) Inertia

(ii)  Impulse

(b)  (i) Give two practical examples where impulse and momentum play an important role.

(ii) A tennis ball of mass 120 g moving at a speed of 10 m/s was brought to rest by one player in 0.02 seconds. Calculate the average force applied by the player.

9.  (a) (i) What is the function of a rheostat in an electric circuit?

(ii) List four factors that affect the resistance of a conductor.

(b)  Study the circuit diagram in Figure 3, then answer the questions that follow: Figure 3: If the current flowing in 5 ? resistor is 2 A, calculate the

(i) Current flowing in the 10 ? resistor.

(ii) Potential difference (p.d.) across the 20 ? resistor.

10. (a) (i) Define the term pressure and give its SI unit.

(ii) Why are dams constructed thicker at the bottom than at the top?

(b) (i) List three applications of hydraulic presses.

(ii) A hydraulic brake has a force of 1000 N applied to a piston whose area is 50 cm2. Calculate the pressure transmitted throughout the liquid.

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