DEMO ~PAPER 140 - QNS

PRESIDENT OFFICE

REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

HAI DISTRICT COUNCIL

FORM FOUR PRE-NATIONAL EXAMINATION-PHYSICS

TIME 3HOURS 27th AUGUST-2021

INSTRUCTIONS

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

2. Answer all questions in sections A and B, and any two(2) questions from section C .

3. Non-Programmable Calculators may be used

4. Where necessary the following constant may be used

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

(ii) Velocity of sound in air =3x10⁸m/s

(iii) Acceleration due to gravity, g=10N/kg or 10m/s².

(iv) Linear expansivity of brick =1.2x10^-5K^-1

(v) Specific heat capacity of water =4200J/Kg℃

(vi) Specific heat capacity of aluminium =900J/Kg℃

SECTION A(15 MARK’S)

1. For each of the items (i)-(x) choose the correct answer from among the given alternatives and write its letter in the answer sheet provided.

(i) Which metals become strongly magnetized when subjected to a magnetic field?

1. Nickel and copper

2. Zinc and aluminium

3. Cobalt and iron

4. Aluminium and lead

5. Iron and zinc

(ii) Which of the following describes particles in a solid at room temperature .

1. Close together and vibrating

2. Close together and not vibrating

3. Close together and moving around at random

4. Far apart and moving at random

5. Far apart and vibrating

(iii) A blue T-shirt absorbs all the colour of the white light the blue T-shirt looks:-

1. Red

2. Blue

3. Black

4. White

5. Cyan

(iv) A constantan wire of diameter 0.40mm has a resistance of 10Ω.what is its length if the resistivity of the wire is 5.0x10-7Ωm?

1. 0.39m

2. 2.52m

3. 3.62m

4. 0.82m

5. 5.41m

(v) The sun generate its energy by the process called

1. Thermonuclear fission

2. Thermonuclear fusion

3. Geothermal energy

4. Geothermal fusion

5. Geothermal fision

(vi) The following is the reason why objects in the air tend to fall at some time.

1. There is usually no resistance in the air

2. Acceleration due to gravity is the same

3. They have the same weight

4. They have acceleration due to gravity equal 9.8m/s2

5. None of the above.

(vii) One difference between a planet and a star is that:-

1. A planet is heavenly body and a planet and planet is luminous heavenly body

2. A star is a heavenly body and a planet and a planet is luminous heavenly

3. A star is lighter than a planet

4. A planet is lighter than a star

5. A star revolve around the sun in elliptical orbit

(viii) The effect of add an acceptor impurity to silicon produce a crystal called:-

1. P-Type

2. N-Type

3. PN-Type

4. NP- Type

5. PNP-Type

(ix) The layer in the atmosphere where weather phenomena are formed is called

1. Stratosphere

2. Magnetosphere

3. Thermosphere

4. Troposphere

5. Exosphere

(x) Which of the following devices works on d.c only ?

1. An electric bell

2. A step -down transformer

3. A transistor

4. An Induction coil

5. A step-up transformer.

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Ans

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