THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1PHYSICS 1

Time: 3Hours November, 2016

Instructions:

1. This paper consists of section A, B and C.
2. Answer all the questions in section A and B and one question from section C
3. Cellular phones and any unauthorized materials are not allowed in the examination room.
4. Write your Examination Number on every page of your answer booklet(s)
5. Where necessary the following constants may be used:

1. Acceleration due to gravity, g = 10m/s^2.
2. Density of water = 1.0g/cm^3.
3. Pie, = 3.14.
4. Coefficient of linear expansivity of the brick = 1.2 x 10^-5 K^-1.
5. Speed of light in air = 3 x 10⁸m/s.
6. Speed of sound in air = 340 m/s

SECTION A:

Answer all questions in this section

1. For each of the items (i) – (x), choose the correct answer among the given alternatives and write its letter beside the item number in the answer booklet provided

(i) The position of the centre of gravity of an object has a significant influence in its

1. Elasticity
2. Plasticity
3. Stability
4. Rigidity
5. Elastic limit.

(ii) Which statement explains the basis of heliocentric theory?

1. The earth was known to revolve around the sun
2. The earth was stationary
3. The sun was known to revolve around the earth
4. The sun was stationary
5. The earth was known to revolve around its axis.

(iii) Which among the following is a reason for the sky to appear blue while being observed from the earth?

1. Regular reflection of sunlight
2. Irregular refraction of sunlight
3. Diffuse refraction of sunlight
4. Selective scattering of sunlight
5. Regular diffraction of sunlight.

(iv) 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
5. Geographic North Pole.

(v) The correct arrangement of metals in ascending order of their linear expansivities is?

1. Iron, Copper, Invar, Brass and Nickel
2. Nickel, Brass, Invar, Copper and Iron
3. Brass, Copper, Nickel, Iron and Invar
4. Invar, Iron, Nickel, Copper and Brass.
5. Nickel, Brass, Iron, Invar and Copper.

(vi) The loudness of a note produced by a vibrating object depends on?

1. The number of vibrations per second
2. The overtones present
3. The quality of sound
4. The wavelength between two nodes
5. The amplitude of vibration.

(vii) How many number of images will be formed if the angle between two mirrors is 0 ?

1. 2
2. 3
3. 4
4. 5
5. Infinite

(viii) The correct statement about radio waves is that:-

1. They have shortest wavelength
2. They can be produced by comets in space
3. They don’t undergo reflection
4. They require medium on its transmission
5. They have smallest frequency

(ix) What is the function of cathode in x – ray tube?

1. To control heat produced n the target
2. To accelerate the speed of electrons
3. To conduct heat away from the target.
4. To control brightness on the screen.
5. To focus electrons on the target.

(x) Which of the following circuit elements has ability to produce gain as used in electronics?

1. Inductor
2. Diode
3. Resistor
4. Capacitor
5. Amplifier.