NAME………………………………………………ADM.NO……………CLASS:……….
SECTION A(30 MARKS)
1.
The diagram below shows a lead block placed on a
floor.
|
40cm
|
|
60cm
|
|
15cm
|
Determine the minimum pressure the
block exerts on the floor given the density of lead is 11 g/cm3. (4
marks)
2.
Explain the differences between a liquid and a
gas in terms of intermolecular distances and forces. (2
marks)
3.
State the Pascal’s principle of transmission of
pressure in fluids. (1mk)
4.
State three factors that affect the pressure in
fluids. (3mks)
5.
Give a reason as to why mercury is preferred to
water as a barometric liquid (1mks)
6.
Explain why water wets a clean glass while it
forms spherical droplets on a waxed glass surface. (4mks)
7.
An empty density bottle weighs 16g. It weighs
28g when full of water and 31g when full of another liquid. Determine:(Take the
density of water =1g/cm3)
a)
The volume of the density bottle. (2mks)
b)
The density of the liquid (3mks)
8.
State and explain the two factors that affect
surface tension (4mks)
9. A diver swimming 7m below sea water
experiences a pressure of 205,000pa. Determine the density of sea water given
that the atmospheric pressure is 100,000pa. (3mrks)
10.
Give the three modes of heat transfer. (3mks)
SECTION B(50
MARKS)
11.
(a) State four factors that affect the rate of
heat transfer in solids. (4. mks)
(b) The figure below shows a set-up used to
investigate conduction in water.
i)
Give a reason of wrapping the ice in the wire
gauze. (1 mrk)
ii)
State the observation made. (2 marks)
iii)
Give the conclusion to the observation made. (3
mark)
12. (a) While in the laboratory the lab technician advises
students to be carefully and observe laboratory
rules.
Amina was found connecting exposed wires in an attempt to light up the room of which
she
complained
of being dark.
i.
State the laboratory rule she broke. (1mark)
ii.
Which accident is she likely to cause? (1mark)
iii.
State first aid measures you are likely to take in case the accident named in a(ii)
above
(3
marks)
b)
State and explain any two branches of physics (4 marks)
c)State
three career courses that require a sound knowledge of physics (3 mrks)
13.
a) Differentiate
between heat and temperature (2
mk)
b)
Give three qualities of a good thermometric
liquid.
(3mks)
c)
State and explain any special feature found on a
clinical thermometer (3
mks)
d)
When marking the fixed points on a thermometer,
it is observed that at 0oC, the mercury thread is of length 0.5cm
and 5.5cm at 100oC. What temperature would correspond to a length of
3cm? (3mks)
14.
a) State
two disadvantages of anomalous expansion of water. (2mks)
b)
Sketch a
graph of volume (y-axis) against temperature, when water is heated from 0oC
to 20oC
(3mks)
c)
State two applications of thermal expansion in solids (2mks)
d)
Give a reason why aquatic life is able to
survive under frozen water (2mks)
15.
(a) Explain the working of a greenhouse
(4mks)
(b)
The figure below shows two tanks containing hot water.
State
and explain the observation made. (3
marks)
