- Draw a vernier caliper scale to show a reading of 3.36cm (2 mks)
- The figure below shows the change in volume of water in a measuring cylinder when an irregular solid is immersed in it.
3. A
small drop of oil has a volume of 5 x 10-8m3. When it is
put on a surface of some clean water, it forms a circular film of 0.1m2
in area.
i.
What is the size of a molecule of oil (3
mks)
ii.
State 2 assumptions you made in your
calculations (2
mks)
4. A body weighs 600N on the surface of the earth and 450N on the surface of another planet. Calculate the value of g in that planet (g on the earth = 10 N/Kg) (3 mks)
5 The
diagram below shows the behavior of mercury in a capillary tube. Explain this
observation (3 marks)
6. How
does temperature rise and impurities affect the surface tension of water (2 mks)
7. The
diagram below shows a soap film trapped in a wire loop with a loose thread
passing through
a) Redraw
the diagram to show how the thread is affected (2
mks)
b) Explain
why the thread behaves in this manner (2
mks)
8. The
reading on a mercury barometer at Mombasa is 760mm. calculate the pressure at
Mombasa (density of mercury = 1.36 x104 Kg/m3) (3 mks)
9. Explain
the reason why a person moving from lowland to highland is likely to suffer a
hose bleeding (3 mks)
10. Describe
a simple experiment to show that pressure in liquid increases as depth
increases (3 mks)
11. Distinguish
between the three states of matter in terms of particle spacing and kinetics (3 mks)
12. Explain
why the blades of a panga feels colder than the wooden handle when touched with
a finger after exposure to low temperatures (2
mks)
13. The
figure below shows a ray of light being incident on a mirror
What
is the angle of reflection (3
mks)
14. The diagram below shows a “couple” in action
Given
that the diameter of the wheel is 0.6m, determine the moment to the couple (3 mks)
15. State
the basic law of magnetism (2
mks)
16. Draw
the magnetic field pattern for the magnets shown below (2 mks)
17. Explain
the reason why a freely suspended bar magnet comes to rest pointing in the N –
S direction (3 mks)
18. Explain
why repulsion is the only sure test for magnetism (2 mks)
19. The figure below shows an electromagnet
i.
Explain why the core is made up of iron
and not steel (2
mks)
ii.
On the same diagram indicate the direction
of the current flow when the switch is closed (1 mk)
iii.
When the current is allowed to flow
through the electromagnet it is magnetized. Identify the poles of the magnet (2
mks)
iv.
Give the name of the law you have used to
determine the poles and state it (3
mks)
v. Explain what would happen if the current is allowed to flow for a long
time (2 mks)
20. Brownian
motion of smoke particles can be studied by using the apparatus shown below. To
observe the motion, some smoke is enclosed in the smoke cell and then observed
through the microscope as shown below.
a) Explain
the role of the smoke particles, lens and microscope in
the experiment (6 mks)
b) State
and explain the nature of the observed motion of the smoke particles (3 mks)
c) State
what will be observed about the motion of the smoke particles if the
temperature surrounding the smoke cell is raised slightly (1
mk)
21. a)
State the principle of moments (2
mks)
b) The
diagram below shows a uniform wooden beam of length 6m and mass 30kg pivoted as
shown below
How far from the pivot will the 65kg
mass be for the beam to be in equilibrium (3
mks)
b) A
uniform metre rule of weight 100N is suspended horizontally by two vertical
springs P and Q placed 20cm and 30cm from its ends respectively. Calculate the
force (tension) in each string(5 mark)
21. In
an experiment to determine the density of a soil using a density bottle, the
following measurements were recorded.
Mass of empty density bottle = 42. 9g
Mass of density bottle full of water = 66.1g
Mass of density bottle with some soil = 67. 2g
Mass of density bottle with soil filled up with water
= 82.0g
Use the above data to determine the:-
a) Mass
of water that completely filled the bottle (2
mks)
b) Volume
of water that completely filled the bottle (1
mk)
c) Volume
of the density bottle (1
mk)
d) Mass
of soil (1
mk)
e) Mass
of water that filled the space above soil (1
mk)
f) Volume
of soil (1
mk)
g) The
density of the soils (2
mks)
22. The
figure below shows the features of a dry cell (lenclanche). Use the information
in the figure to answer the following questions.
a) Name
the parts (4
mks)
A…………………
B………………
C……………
D……………
a) Explain
the purpose of B (2
mks)
a) State
2 defects of a dry cell and give their remedies (4 mks)
ae sir thnks 4 assino
ReplyDeleteWelcome. For any challenging question, we can discuss and give hits.
Deletedo u have the answers to it want to test my son
DeleteAnswer to no 4
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