🌊PAPER 9~QNS

 

PRESIDENT’S OFFICE

THE UNITED REPUBLIC OF TANZANIA

THE MINISTRY OF EDUCATION, SCIENCE AND TECHNOLOGY

HALISI SECONDARY SCHOOL

31/01 PHYSICS 01 FORM 3

TIME: 2:00 HOURS Thursday 7 March 2024 INSTRUCTIONS:

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

2. Answer all questions in section A and B and only two (02) questions from section C.

3. cellular phones and any unauthorized materials are not allowed in the examination room

4. Non programmable calculators may be used.

5. Where necessary the following constants may be used; (i) Acceleration due to gravity, g=10m/s² or 10N/kg.

(ii) Density of water= 1g/cm³ or 1000 kg/m³.

SECTION A (16MARKS)

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.

   1. Which of the following is the correct weight of a body of mass 42g when placed on the moon surface?

      1. 42N

      2. 0.07N

      3. 0.7N

      4. 4.2N

2. Suppose you are provided with a coca cola the instrument you can use to measure bottle’s neck is known as

   1. Vernier caliper

   2. Meter rule

   3. Micrometer screw gauge

   4. Tape measure

3. Surface tension of a liquid

   1. Reduces with increase in temperature

   2. Is not affected by temperature changes

   3. Reduces with drop in temperature change

   4. Increase with increase in temperature.

4. A boy stands straight in front of a mirror erect image whose height is a fifth of his real height. The mirror he is using is

   1. Plane mirror

   2. Convex mirror

   3. Concave mirror

   4. Plano-convex mirror.

5. A piece of wood is floating in water in this case

   1. The upthrust of water is greater than the weight of the wood.

   2. The upthrust of water is equal to the weight of the wood

   3. The density of the wood is equal to the density of the wood.

   4. The density of water is less than the density of the wood.

6. The product of force and velocity represents

   1. Momentum

   2. Work done

   3. Moment

   4. Power

7. A material which is slightly repelled by a magnetic field in known as

   1. ferromagnetic material

   2. paramagnetic material

   3. diamagnetic material

   4. conducting material

8. A house is painted green and blue .What color will it appear when viewed through a magenta filter?

1. Black and blue

2. Black and green

3. Green and blue

4. Black

(ix) Which of the following is an example of derived quantity?

1. Electric current

2. Displacement

3. Mass

4. Time

(x) In a loading a lorry a man lifts boxes each of weight 100N through a height of 1.5m, if he lifts 4 boxes per minute, the average power the man is working is

1. 100

2. 10

3. 600

4. 37.5

Qns	i	ii	iii	iv	v	vi	vii	viii	ix	x
Ans

2. Match the items in List A with responses in List B by writing the letter of the corresponding response beside the item number in the answer sheet provided.

LIST A

LIST B

Additive mixing of colour Subtractive mixing of colour Primary colours of light Primary rainbow Complementary colours Primary pigment

Cyan, magenta, yellow Red, Blue, Green Red, cyan Blue, Magenta Is formed as a result of light that has undergone two total internal reflection in water droplet Is formed as a result of light that has undergone one total internal reflection in a water droplet. It decreases number of wavelength from total mixture H. When two primary colours are mixed the colour are subtracted from white light , and the mixture primary colours combine to form while It increases the number of wavelengths present. Absorbs one primary colour and reflect other Absorbs two primary colours and reflect other

SECTION B(54 MARKS)

Answer All questions in this section.

3. (a) Figure below shows nitrogen gas in a spherical flask.

Determine the pressure of a gas. Given that atmospheric pressure is 102 kpa and density of mercury is 13.6g/cm³.

(b) A uniform wooden lath, AB 120cm long and weighing 1.2N rests on two sharp- edged supports C and D placed 10cm from each end of the path respectively . A 0.2N weights hangs from a loop thread 30 cm from A and a 0.9N weight hangs 40cm from B .Find the reactions at the supports

4. (a) Describe the mode of action of a simple microscope

(b) We sometimes see what looks like a pool of water at a distance on a dry road during sunny and hot days.However, when we get to the spot, the road is perfectly dry. Describe briefly how this situation occurs.

5. (a) A daladala bus travelling from Malimbe to Igoma stopped suddenly and the passenger started to push it from inside. Will the bus move ? Explain how you reached to your answer (05 marks)

(b) The handle of a screw jack is 35cm long and the pitch of the screw is 0.5cm.Calculate the force that must be applied at the end of the handle when lifting a load of 2500N if the efficiency of the jack is 60%

6. (a) Describe the mode of action of the hydrometer.

(b)An empty density bottle has a mass of 25g.its mass when full of water is 50g and 45g when full of another liquid, L. What is the density of a liquid , L in kg/m3. (05 marks)

7. A body A of mass 400g moving with a velocity of 20m/s Collided with body B of mass 50g at rest. If a body of mass 50g moves with a velocity of 10m/s after collision in the direction of body A. Find the velocity of body A after collision.

(b) A boy pulls a trolley through a distance of 20cm by means of a rope inclined at 45⁰ to the horizontal if the tension in the rope is 200N. Calculate the effective force tending to lift the trolley off the ground and the work done by the boy.

8. The battery in the circuit bellow has an e.m.f of 30V and negligible internal resistance .Calculate the potential difference across 5Ω resistor.

(b) A brick is sliding at 6m/s across a concrete horizontal surface floor and the coefficient of friction between the two surfaces is 0.4. How far will it travel before coming to rest (5 marks) .

SECTION C (30 MARKS)

Choose two (2) questions from this section

9. Ali uses a concave mirror to form an image of an optical pin in the laboratory , where should be place the pin by sketching in order to obtain an image that is

   1. upright and magnified (02marks)

   2. Inverted and diminished (02marks)

2. Explain why the dentist would prefer to use a concave mirror rather than plane mirror. (03 marks).

3. A concave mirror with a radius of curvature of 30cm produces an inverted image 4 times the size of an object placed on its principal axis. Determine the position of the object and that of the image .

10. (a) Describe the mode of action of an electroscope (6.5marks)

2. Many buildings are protected from lightning by lightning conductors. Explains what is the purpose of burying the copper plate in the earth? (03 marks)

3. Explain why petrol tankers usually have a length of metal chain hanging down touching the ground

11. (a) Figure below shows two iron nails picked up by a magnet.

(i) Why are the nails attracted to the magnet

2. Explain why the nails spread out at the end further from the magnet. Suppose you are given a bar magnet whose poles are not labelled. Explain how you could determine which end of the bar is the north pole in the laboratory

3. Describe an activity to determine relative density of a solid using Archimedes’ principle

→Get a Copy←