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KCSE CLUSTER TESTS 26

Physics Paper 1

SECTION A (25 Marks)

1.

Pressure on the bubble reduces as it rises to the surface of water,

1 marks

2.

2 marks

3.

Many electron are involved in heat transfer with minimal heat loss

1 marks

4.

The weight of masses exert pressure on ice below the wire to melt as is cuts through The melted ice above the wire no long under pressure refreezes, latent heat of fusion is drawn from the wire

2 marks

5.

i) Liquids are incompressible and

ii) Transmit pressure equally.

2 marks

6.

Unstable;^ any push causes the marble to

Roll to lower its CoG

2 marks

7.

i) F = 20N

ii) a (I) Weight/force gravity

(II) Up thrust/viscosity

b) Moves at constant terminal velocity

3 marks

8.

Inter- molecules forces exist between molecules of a real gas unlike in an ideal gas where intermolecular forces don’t exist,√ (1mk)

- in an ideal gas there is elastic collision between molecules whereas in a real gas the collision is inelastic,

2 marks

9.

2 marks

10.

)Methylated spirit vaporizes faster than water drawing latent heat of vaporization from the hand

1 marks

11.

Faster moving air above the wing causes lower pressure above . Higher pressure difference cause a lift effect .

2 marks

12.

The tension in the string reduces because upthrust on the block increase with density

1 marks

13.

2 marks

14.

2 marks

SECTION B (55 Marks)

15.

a) The pressure of on fixed mass of a gas is directly proportional to the absolute temperature provided the volume is kept constant

c) Is the lowest possible temperature on the Kelvin scale;

d) P =phg

8 marks

16.

iii) Some of the potential energy is lost as work done against air resistance;

13 marks

17.

8 marks

18.

a) Is the heat required to raise the temperature of a unit mass of a substance by 1 Kelvin

10 marks

19.

14 marks

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