CHESAMISI BOYS’ HIGH SCHOOL
KIMILILI
PHYSICS FORM I TERM 2 2016
AUGUST HOLIDAY ASSIGNMENT
NAME________________________________ADM NO________
PARTICULATE NATURE OF MATTER
1. (a) State the kinetic theory of matter
(b) State two reasons why gas particles diffuse faster than solid particles
2. Distinguish between gases and liquids in terms of inter molecule forces.
3. Two samples of bromine vapour are allowed to diffuse separately under different
conditions, one in a vacuum and the other in air. State with reasons the conditions in
which bromine will diffuse faster
4. Smoke particles in air when strongly illuminated were observed to describe continuous,
random haphazard movements. Explain what would be observed when the air
temperature is decreased
5. A partially filled balloon is placed in a bell jar with its open end on a thick glass plate as
shown in figure 1. The contact between the jar and the glass plate is greased to make
it air tight:
State and explain what happens to the balloon when air in the ball jar is slowly evacuated
6. Study the figure 2 below and answer the questions that follow
A
Tube
NH3 gas
Cotton wool soaked
in conc. NH3
solution
a.
b.
c.
d.
7.
B
HCl gas
Cotton wool
soaked in conc.
HCl solution
Clamp Cork
Stand
State the observation made.
Explain the observation made.
Write an equation for the explanation given.
Which of the two gases diffuses faster? Explain.
Figure 3 below shows an arrangement to demonstrate diffusion through solids:-
The hydrogen gas is supplied for sometimes then stopped. State and explain what is likely
to be observed when the hydrogen gas supply:i. is on
ii. is stopped
8. In an experiment to demonstrate Brownian motion, smoke was placed in air cell and
observed under a microscope. Smoke particles were observed to move randomly in the
cell.
i. Explain the observation
ii. Give a reason for using small particles such as those of smoke in this experiment
iii. What would be the most likely observation if the temperature in the smoke cell was
raised?
9. What is the experimental evidence that shows that molecules in gases and liquids are
in a state of motion
THERMAL EXPANSION
1. Define thermal expansion
(1mk)
2. What is temperature
(1mk)
3. In the experiment of the ball and ring, the ball initially goes through the ring. After
heating the ball it does not go through the ring. If left there for some time, the ball goes
through the ring. Explain?
(2mks)
4. Define linear expansivity
(1mk)
5. What is a bimetallic strip
(1mk)
6. Give a reason why a concrete beam reinforced with steel does not crack when subjected
to Changes in temperature.
(1mk)
7. Figure 1 shows a bimetallic strip made of brass and iron. A marble is placed at end A
of the bimetallic strip as shown below:-
State and explain what will be observed when the bimetallic strip is strongly cooled
8. Figure 2 shows a beam balance made out of concrete and reinforced with steel
Concrete
Steel
Use the diagram to explain the behaviour of the shape of the beam when heated up (2mks)
9. The Figure 3 below represents a bimetallic strip of metals X and Y at room temperature
The figure 4 below shows its shape when dipped into crushed ice
Sketch a diagram in the space given below to show the shape when the strip is heated to a
temperature above the room temperature (1mk)
10. Explain why most laboratory glasswares are made of pyrex glass other than ordinary
glass
(2mks)
11. A faulty thermometer reads 20oC when dipped into melting ice and 140oC when on
steam under normal atmospheric pressure. What will this thermometer read when
dipped into a liquid at 60oC.
(4mks)
12. Explain how the following can be improved on a thermometer
a. Sensitivity
(2mks)
b. Accuracy
(1mk)
13. Explain why boiling water is not used for sterilization of a clinical thermometer. What is
normally used
14. (a) Sate two liquids which are used in thermometer.
(b) With a reason, state which of the two liquids in 3 (a) above is used to measure
temperature in areas where temperatures are:
(i) Below -400c
(ii) 1500c
15. What do you understand by the statement ‘lower fixed point’ on a temperature scale?
16. a) What do you understand by the term upper fixed point?
b) The Figure 5 below shows an arrangement used to determine the upper fixed point
of ungraduated thermometer.
(i) Name liquid A.
(1mk)
(ii) Why is the bulb of thermometer not dipped in liquid A.
17. Sketch the graph of volume against temperature of water between – 100c to 1000 c
18. Use the kinetic theory to explain thermal expansion of solids
19. Sketch and explain how a bimetallic thermometer works.
(3mks)
20. A bottle of soda always has a space between the cap and the top of the liquid. Explain
21. Give three reasons why water cannot be used a thermometric liquid (3mks)
22. Study the Figure 6 below and answer the questions that follow
a. State the observation made
(1mk)
b. Explain the observations made
(2mks)
23. State five characteristics of a good thermometric liquid
(5mks)
24. When marking the fixed points on a thermometer, it is observed that at 0 oc the alcohol
thread is of length 5cm and 15cm at 100oc. what temperature would correspond to a
length of 10cm.
(3mks)
25. Figure 7 below shows the glass shade of a lamp with a copper wire wound round it. It
was observed that the glass is less likely to crack than when there is no copper wire
wound around it.
Explain the above observation
(2mk)
26. Convert the following in to the units indicated in brackets
i.
25oC [K]
(1mk)
ii.
300K [OC]
(1mk)
HEAT TRANSFER
1. Define heat and state its SI unit
[2mks]
2. Define the following terms
a. Temperature
[1mk]
b. Thermal equilibrium
[1mk]
3. Metals are good conductors of heat. Explain [1mk]
4. State and explain four factors affecting rate of heat flow/thermal conductivity
5. Explain why steel feels cooler than wood at the same temperature.
6. What is lagging
[1mk]
[4mks]
7. Study the Figure 1 below and answer the questions that follow.
a. State the observation made after heating for some time [1mk]
b. Explain the observation made
[1mk]
c. Give reasons for the following
i.
The boiling tube is made of glass
[1mk]
ii.
Ice is wrapped in a wire gauze [1mk]
iii.
Water is heated at the top
[1mk]
8. Explain why liquids are poor conductors of heat
[1mk]
9. Explain why birds flap their wings after being rained on. [2mks]
10. Explain why a shiny tea pot stays hotter than a dull brown tea pot.
End
Physics Department