SENIOR THREE HOLIDAY WORK APRIL 2012

1. Mechanical energy is

a) chemical energy + kinetic energy.

b) Potential energy + kinetic energy.

c) Potential energy + electrical energy.

d) Kinetic energy + heat energy.

2. Which of the following is not a fundamental measurement in physics?

a) Time

b) length

c) weight

d) mass

3. What instrument is not used to measure the mass of a body?

a) beam balance

b) Lever balance

c) top pan balance

d) spring balance

4. Find the volume of 10kg of glass in m3 (Density of glass = 2500kg m-3)

a) 4 x 10-4

b) 4 x 10-3

c) 2.5 x 102

d) 2.5 x 10-2

5. The density of petro is 0.72 g/cm3 Express this in S.I units.

a) 0.00072kgm-3

b) 7.2kg/m3

c) 720 kg/m3

d) 7200 kg/m3

6. What unit means one thousand of a gram?

a) milligram

b) decigram

c) centigram

d) kilogram

7. The main energy change when a tungsten filament bulb is switched on is;

a) light to electricity.

b) Electricity to sound.

c) Electricity to heat and light

d) Electricity to light only.

8. Density is the ratio of

a) mass/density

b) Volume /Density

c) Volume/ Mass

d) Mass/ Volume

9. The relative density bottle gives an accurate value of the relative density of a liquid because

a) the weight of the bottle is constant.

b) The bottle holds the same volume of liquid.

c) The bottle need not be weighed.

d) The volume of the bottle depends on the liquid it holds.

10. A liquid has a density of 8.2g/cm3. What is its relative density?

(Density of water = 1g/cm3

a) 8.2g/cm3

b) 0.82g/cm3

c) 0.82

d) 8.2

11. A stone displaced 20cm<sup>3</sup> of water in a measuring cylinder. The volume of the stone is;

a) 40cm3

b) 30cm3

c) 20cm3

d) 10cm3

12. A body has a mass of 1600kg and its density is 800kg/m<sup>3</sup>. Find its volume in cubic metres.

a) 1600kg/m3

b) 800m3

c) 2kg/m3

d) 2m3

13. What measure in centimeters is 0.01m

a) 1cm

b) 10cm

c) 100cm

d) 1000cm

14. Which of the following is used to measure long distances?

a) thread

b) ruler

c) tape measure

d) rod

15. A rectangular block of metal 0.3m by 0.1m by 0.5m weighs 0.03kg. Calculate its density in kg/m3

a) 0.002

b) 0.2

c) 2

d) 200

16. Which of the following statements about states of matter is true?

i.A vapour has no definite volume and shape.

ii.A liquid has a definite volume but no definite shape.

iii.A solid has a definite volume and shape.

iv.A gas has a definite volume and shape.

a) i. ii and iv only

b) i. ii and iii only

c) i and iv only

d) ii and iv only

17. Capillary rise in a tube dipped in water is due to;

a) High vapour pressure

b) High tension

c) Adhesive force being greater than cohesive force.

d) Cohesive force being greater than adhesive force.

18. A blue copper sulphate crystal placed at the bottom of a beaker containing water is found to spread throughout the water after some time due to

a) osmosis

b) diffusion

c) surface tension

d) capillarity

19. A needle may float on a clean water surface but sinks when some detergent or soap is added to water because the detergent.

a) reduces the density of water.

b) Lowers the surface tension of water.

c) Makes the surface slippery.

d) Increases adhesive force between the needle and water molecules.

20. Which of these affect the surface tension of a liquid?

a) Density of the liquid

b) Temperature

c) Container

d) Volume of the liquid.

21. A towel dries a wet body due to

a) cohesion

b) osmosis

c) surface tension

d) capillarity

22. The surface tension of liquid is due to

a) diffusion on its surface

b) cohesion between molecules.

c) The Brownian motion of its surface molecules.

d) The Kinetic energy of the surface molecules.

23. The best classification of the materials copper, iron, glass and silver is that they are all

a) metals

b) Non – metals

c) solids

d) hard to break when hammered

24. In liquids and gasses, the spread of molecules due to their constant rapid motion is called?

a) Diffusion

b) random motion

c) Brownian motion

d) Evaporation

25. The unit of energy is

a) kilogram

b) second

c) Newton

d) Joule

------Key------

1. (b)

2. (c)

3. (d)

4. (b)

5. (c)

6. (d)

7. (c)

8. (d)

9. (b)

10. (d)

11. (c)

12. (d)

13. (a)

14. (c)

15. (c)

16. (b)

17. (c)

18. (b)

19. (b)

20. (b)

21. (a)

22. (b)

23. (a)

24. (c)

25. (d)