THE UNITED REPUBLIC OF TANZANIA MINISTRY OF EDUCATION AND VOCATIONAL TRAINING

FORM TWO SECONDARY EDUCATION EXAMINATION, 2004

0031 PHYSICS 

Time: 2 Hours 

Instructions

1.This paper consists of sections A, B and C.

2.Answer ALL questions

3.Question in section C should be answered on separate sheets of paper provided. In your calculations you are required to show clearly all the steps of your work in a systematic manner.

4.Whenever necessary use the following constants.

• Density of water = 1 g/cm³
• Acceleration due to gravity = 10 m/s²
• S.T.P. means T = 273 K, P = 760 mmHg
• Density of Mercury = 13.6 g/cm³ = 13600 kg/m³ 
• Specific Heat Capacity of water is 4200 J/kg K.

SECTION A

Answer ALL questions in this Section by writing the letter of the correct answer beside the question number in your answer book.

1. (i) The branch of science in which the relationship between matter and energy is studied is called:

1. Chemistry 
2. Biology
3. Physics 
4. Agriculture Science

(ii) Measurement in Physics is:

1. Calculation
2. Beam balance
3. Spring balance
4. The processes of assigning numbers to observations and events.

(iii)A mass of 1 kilogram is pushed by the gravitation force towards the centre of the earth by a force of:

1. 1 Newton 
2. 10 Newtons
3. 100 Newtons 
4. 1000 Newtons

(iv) The velocity-time graph has a slope which represents:

1. Displacement 
2. Acceleration
3. Velocity
4. Spéed

(v)The molecules of water and those of glass will attract each other by a force known as:

1. Adhesion
2. Cohesion
3. Viscosity
4. Osmotic pressure

(vi) If Maganga wants to establish a temperature scale then he should know the following:

1. Fixed point fundamental interval, an equation relating physical quantity and temperature change.
2. Thermometer, ice point and steam point.
3. Water, ice point mercury.
4. Fundamental interval and thermometer.

(vii) Work and energy have the same SI unit of:

1. Calorie 
2. Joule 
3. Watt 
4. Pascal

(viii)The temperature of a body is defined as:

1. The degree of hotness
2. The degree of coldness
3. The degree of hotness and coldness
4. The degree of hotness or coldness

(ix)Heat energy is transferred from the sun to the earth by the process of:

1. Convection
2. Radiation
3. Conduction 
4. None of the above

(x)A metal rod has a length of 40cm on a day when the temperature of the room is 22.3 ⁰ C. What will its length be on a day when the temperature of the room is 30⁰C and the linear expansivity of the metal is 0.000017 ⁰ C-1?

1. 40.021 cm 
2. 40.0052 cm
3. 0.0052 cm 
4. 39.9948 cm

(xi)A substance of mass 2 kg is supplied with heat of 4800 J, and causes its temperature to rise by 4K. The specific heat capacity of the substance is:

1. 0.6 J/kg K 
2. 600 J/kg K
3. 38.4 J/kgK 
4. 2400 J/kgK

(xii)A wheelbarrow is an example of:

1. First class lever
2. Third class lever
3. Complex machine
4. Second class lever

(xiii)A block and tackle system has six pulleys. What is the velocity ration of this system?

1. 12
2. 3
3. 6
4. 8

(xiv) An instrument which is used to observe objects around obstacles is called:

1. Plane glass 
2. Telescope
3. Periscope 
4. Microscope

(xv)When charging a body by rubbing with either fur or silk the particles which are transferred are: 

1. Protons and electrons
2. Protons
3. Electrons
4. Nuclei

(xvi) Current electricity can be measured in:

1. Ohms
2. Coulomb
3. Volt 
4. Milliampere

(xvii) Two resistors each having a resistance of 3 ohms are connected in parallel; the resulting effective resistance is:

1. 1.5 ohms 
2. 2.0 ohms
3. 4.0 ohms 
4. 2.5 ohms

(xviii)The process whereby materials recover their original length after removing the loads is known as:

1. Plasticity
2. Deformicity
3. Elastic limit 
4. Elasticity

(xix)A piece of metal of volume 10 has a mass of 65.5 kg. The density of metal is:

1. 65.5 kg/m³  
2. 6.55 kg/m³
3. 655 kg/m³  
4. 0.655 kg/m³

(xx) A ray of light is incident normally on a plane mirror. The angle of reflection will be:

1. 45 ⁰  
2. 90 ⁰  
3. 0⁰
4. None of the above.

SECTION B

2.Match the following items by writing a letter of the correct meaning from List B against the number of the item in list A.

Answer Questions 3 - 6 by filling in the correct answers in the spaces provided.

3.(a) Differentiate between mass and weight.

(b)(i) The weight of a body when in water is known as the. . . . . . . . . . weight.

(ii)The force acting normally per unit area is called . . . . . . . . . . 

(iii)Thermostat, rivets, bar and gape are applications. . . . . . . . . .of expansion.

4.Matter is made up of small particles known as:

(i) . . . . . . . . . . 

(ii) . . . . . . . . . . 

(b)Three basic apparatus in a physics laboratory are:

(c) Forces are of several kinds. Mention any three:

5.(a) The two uses of a gold leaf electroscope are: . . . . . . . . . .

(b) In verification of Ohm's Law the following circuit was used during the experiment.

1. P: represents. . . . . . . . . .
2. Q: represents. . . . . . . . . .
3. S: represents. . . . . . . . . .
4. T: represents. . . . . . . . . .
5. F: represents. . . . . . . . . .
6. K: represents. . . . . . . . . .

6.(a) State the Laws of Reflection of Light.

(b) Draw a labelled ray diagram showing the effect of:

(i) a point source of light placed before an opaque object.

(ii) an extended source of light placed before an opaque object. 

(c) State characteristics of images formed in plane mirrors.

SECTION C

7. (a) Define linear expansivity of a substance.

(b) Explain why small gaps between two rail bars are left when being installed.

(c) A metal rod 50 cm long at 0⁰ C becomes 50.06 cm long at 100 ⁰C. Find the linear expansivity of the metal.

8.(a) What are the effects of pressure on the boiling point of a liquid?

(b)Why do people suffer from nose bleeding at high altitudes?

(c) A column of mercury is 700 mm high and the area of its base is 2.00 cm² . Find:

(i) the pressure it exerts. 

(ii) the force it exerts.

9. (a) What is a machine?

(b) Explain the meaning of:

(i)mechanical advantage

(ii)velocity ratio

(iii) efficiency of a simple machine

(c) An inclined plane is 7 m long and its height is 1 m. If the efficiency of the plane is 70%, find the load which can be moved up the plane by an effort of 150 N parallel to the plane.

10.(a) (i) Draw the cooling and melting curves for naphthalene. 

(ii) Differentiate between boiling and melting point.

(b) Define the following terms:

(i)Heat capacity.

(ii)Specific heat capacity.

(c) A piece of metal with mass of 200 g at a temperature of 100 ⁰ C is transferred into 50 g of water at 20 ⁰ C. Find the final temperature of the system.

Use: Specific heat capacity of water = 4200 J/kg⁰ C.

Specific heat capacity of metal = 40 J/kg ⁰ C