–Increasing temperature.√ (1mark)

-Enlarge surface area of exposure.√ (1mark) .

Acceleration (1 mark)

Correct graph (constant acceleration) (1mark

A needle float because of the surface tension at the surface/surface tension broken for the needle to sink. √(1mark)

Fixed mass of ages, or a given mass or mass constant

Sum of clockwise moment =sum of anticlockwise moments

Force between the magnets =7.5 -3=4.5 (Attractive) (1mark)

Air above the plane move faster than air below creating a region of low pressure above

Stops rising when up thrust equal to the weight. √ Or Upward forces equal to downward force.(1mark

. Net force zero √ or Resultant force zero

For a real gas there is no force of attraction between molecules.√ (1mark

(b) (i) For quick action /conduction of heat) √ (1mark)

(ii) Makes the thermometer sensitive. √ (1mark)

(c) -Expand regularly.√ (1mark) -Have wider temperature range.√ (1mark

(e) Ice-berg have density close√ to that of water hence it is partially submerged√ and cannot be seen.

(a) Is the heat used to change liquid to gaseous state without change in temperature

(c) (i) Boiling temperature rises.√(1mark)

(ii) Clipping the rubber tube makes steam to accumulate increasing pressure inside the flask.√ (1mark)

Increased pressure makes it difficult for the water molecule to escape into vapour, hence more energy is require.√ (1mark)

(a) 6N.

(b) (i) Resultant force =10- 6√(1mark) =4N√ (1mark)

(a) (i) 1.2 sec √√ (2marks)

(ii) h =Area under curve √

(a) Etrapolation√ (correct) (1mark) Absolute temperature -275 to 280 √ (1mark)

(b) (i) Atmospheric pressure/76 cmHg/760 mmHg √(1mark)

(ii) 24 +76 =100 cmHg or 1000 mmHg√ (1mark)

(c) (i) To expel air/remove air/push air out/drive air out.√(1mark)

(ii) Pressure of air outside the bottle is greater than the pressure of air inside.√ (1mark)

(iii) Cooling cause condensation (1mark) of vapour, creating a partial √ (1mark)

vacuum/fewer vapour /Lowering pressure inside the bottle.