FORM TWO PHYSICS NECTA 2013

THE UNITED REPUBLIC OF TANZANIA

MINISTRY OF EDUCATION AND VOCATIONAL TRAINING

FORM TWO SECONDARY EDUCATION EXAMINATION, 2013 0031 PHYSICS

# INSTRUCTIONS

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

3.  ALL answers must be written in the spaces provided. 4. Write your examination number at the top right corner of every page.

5.  ALL writing must be in blue or black ink EXCEPT drawings which must be in pencil.

6.  Cellphones and calculators are not allowed in the examination room.

7.  You may use the following constants in your calculations:

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

Density of mercury = 13.6 g/cm3 or 13,600 kg/m3

Acceleration due to gravity = 10 m/s2

Standard Temperature and Pressure (STP): T = 273 K, P = 760 mm Hg.

# SECTION A (20 MARKS)

1.Write the letter of the correct answer in the box provided for each of the following items:

i) The relation of Physics with Chemistry is in making:

1. algebra, trigonometry and chemical change
2. insect killers, perfume and fertilizers
3. photosynthesis and food
4. rain gauge, wind vane and thermometer.

(ii) Which of the following group of instruments is used to measure the basic fundamental quantities?

1. Beam bålance, stop watch and vernier calliper
2. Chemical balance, stop watch and measuring cylinder
3. Measuring cylinder, beam balance and metre rule
4. Spring balance, stop watch and micrometer screw gauge.

(iii) The swelling of soaked beans in water is demonstration of:

1. capillarity
2. diffusion
3. osmosis
4. viscosity Which of the following is a property of a solid state?

1. Inter-particles distance is large
2. Particles are closely packed together
3. Particles are not closely packed together
4. Particles move randomly

(v) An instrument which is used to observe objects around obstacles is

1. microscope
2. periscope
3. plane glass
4. telescope

(vi) The relationship between pressure and area is that on:

1.   changing area, nothing happens
2. decreasing area, pressure decreases
3. decreasing pressure, volume increases
4. increasing area, pressure decreases

(vii)  A piece of metal with a volume of 0.00012m3 has a mass of 0.12kg. The density of metal will be:

1. 100kg/m
2. 1,000kg/m3
3. 10,000kg/m
4. 1000,000kg/m3

(viii)  If a student gets an electric shock and falls down unconscious in a physics laboratory, which of the following would you do first to help the victim?

2. Call a medical doctor immediately
3. Call other students to surround the victim
4. Call a physics teacher to give the victim medicine

(ix)  The sun is an example of a luminous body because it:

1. is a big star
3.   produces its own light
4. reflects light from the earth

(x)  A smell of rotten body can be felt through the process of:

1. diffusion
2. evaporation
3. osmosis
4. transpiration

(xi)  The energy formed due to the rising and falling in the level of water in the oceans or seas is known as:

1. electric energy
2. tidal energy
3. water energy
4. wind energy

xii) the following are applications of magnetism in daily life except;

1. banks make use of magnetic ink on cheques
2. flour is passed near a magnet before being packed
3. magnets are used to separate sand from glass
4. VHS tapes are manufactured as a result of magnetism

(xiii)  A measuring cylinder contains liquid to a level x. An object of volume z is totally immersed in the liquid contained in the cylinder. The new reading of the level of the liquid will be:

1. x
2. x-z
3. z+x
4. z-x

(xiv)  An object with low centre of gravity and a wide base is:

1. neutral
2. stable 3. unequilibral
4. unstable

(xv) A ball of mass 0.6kg is kicked vertically up to a height of 6m. The potential energy acquired by the ball is:

1. A. 0.36J
2.  3.6J
3. 36J
4. D. 3601

(xvi)  From the Archimedes principle, the upthrust acting on a body is equal to the:

1. apparent loss in weight
2. apparent weight
3. weight of a body in air
4. weight of a body in water

(xvii)  What is the total resistance of two resistors, RI = 2 and Rz 3 connected in parallel?

1. 1.2
2. 5
3. 6
4. 12

(xviii)  The SI unit of electric charge is:

1. ampere
2. coulomb
3. ohm
4. second

(xix)  The acceleration of a body of mass 3Dkg when a constant force of 150N is applied on it will be:

1. 0.05m/s
2. 0.5m/s2 3. 5.0m/s2
4. 50m/s2

xx) Materials which allow electricityand heat to pass freely are termed;

1. conductors
2. insulators
3. semi-conductors
4. semi-insulators

# 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 Attractive force between molecules of the same substance Bodies that give out light Device used to put on and off an electric current Instrument used to convert wind energy to mechanical energy Magnetic field is zero Measures body temperature Measures mass of the body Product of mass and velocity Adhesive force Beam balance Clinical thermometer Cohesive force Luminous objects Magnetic field Momentum Neutral point Six’s thermometer Spring balance Switch Wind mill

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

1.  In the velocity time graph, the slope represents
2.  The weight of a body when in water is known as
3.  Devices for storing charge are called
4.  The type of force which causes the size and volume of an object to decrease is known as
5.  The tendency of an object to remain on the surface of a fluid due to the force  exerted by the fluid is called

4. (a) Define the term “Pressure”

(b)  A rectangular object whose dimensions are 1.4 m by 0.1 m by 2.0 m has a density of 200 kg/m3. Calculate the minimum pressure when placed on a table.

5. (a) Define each of the following terms as applied in Physics:

(i)  Volume

(ii)  Moment of force

(b)  An object of 100 kg is lifted to a height of 5 m above the ground in 3 seconds. Calculate its:

(i)  Work done

(ii) Power

6.  (a) Define the term “force” and state its SI unit

(b) A spring balance reads 12 N when a metal block is suspended from it and 10 N when the block is completely immersed in water. Calculate the:

(i)  Upthrust on the block

(ii)  Relative density of the block

# SECTION C (40 MARKS)

7.  (a) Define the following terms as applied to machines:

(ii)  Effort

(iii)  Efficiency

(b)  A load of 500 N is raised through 5 m by a machine when its effort moves simultaneously though a distance of 25 m. If the efficiency of the machine is 80%, calculate its mechanical advantage.

8.  (a) (i) State the law of conservation of linear momentum.

(ii) Define the term “elastic collision”.

(b) A body of mass 8 kg moving with a velocity of 20 m/s collides with another body of mass 4 kg moving with a velocity of 10 m/s in the same direction. The velocity of the 8 kg body is reduced to 15 m/s after the collision. If the bodies do not stick together after the collision, calculate the final velocity of the 4 kg body.

9.  (a) Differentiate a ray of light from a beam of light.

(b)  Mention four properties of an image formed by a plane mirror.

10.  (a) State the law of magnetism.

(b) For each of the following, sketch the resulting magnetic field and mark the position of the neutral point if any, when:

(i)  Two N-poles are brought close to each other but not touching.

(ii)  N-pole and S-pole are brought close to each other but not touching.

### For Call,Sms&WhatsApp: 255769929722 / 255754805256 ## WHATSAPP US NOW FOR ANY QUERY

GO TO NECTA EXAMS