14. What is the typical diet of grasshoppers?
A. Carnivorous B. Herbivorous
C.Omnivorous D. Detritivores
15. How does lightning contribute to the
nitrogen cycle? It
A. decomposes organic matter.
B. fixes atmospheric nitrogen into nitrates.
C. releases nitrogen gas into the atmosphere.
D. converts nitrates back into nitrogen gas.
16. Sodium carbonate is a binary compound
used in
A. fertilizers. B. glass manufacturing.
C. antiseptics. D. batteries.
17. What is the pH of a strong acid?
A. 1 B. 7 C. 14 D. Less than 3
18. What is the chemical formula for carbon
dioxide?
A. CO3 B. CO2 C. CO D. C2O
19. Which gas makes up the majority of earth's
atmosphere?
A. Nitrogen B. Oxygen
C.. Carbon dioxide D. Hydrogen
20. Calcium oxide is used primarily in
A. cement production. B. perfume making.
C. food coloring. D. batteries.
21. Which part of the circulatory system is
responsible for carrying oxygenated blood
away from the heart?
A. Veins B. Capillaries
C. Red blood cells D. Arteries
22. Which of the following is an example of a
binary chemical compound?
A. Water B. Sodium chloride
C. Vinegar D. Hydrogen peroxide
23. If a device consumes 500 watts and is used
for 5 hours, how much energy is consumed?
A. 1000 Wh B. 5000 Wh
C. 2500 Wh D. 2000 Wh
24. How does the size of a shadow change with
a larger light source?
A. Shadow becomes smaller.
B. Shadow becomes larger.
C. Shadow becomes fainter.
D. Shadow remains the same size.
25. What unit is used to measure energy
consumption over time?
A. Watts B. Volts
C. Amps D. Watt-hours
26. What is formed when light is completely
blocked by an object? A
A. rainbow. B. shadow.
C. reflection. D. mirage.
27. Which of the following is a significant use
of ammonia?
A. Food coloring B. Fertilizer production
C. Bleaching agent D. Teeth whitening
28. Which part of the heart is responsible for
pumping oxygenated blood to the body?
A. Right atrium B. Left atrium
C. Right ventricle D. Left ventricle
29. If a device has a power of 100W and is used
for 10 hours, what is the total energy
consumed?
A. 10 Wh B. 100 Wh
C..10000 Wh D. 1000 Wh
30. What is a primary impact of grasshoppers
on agriculture?
A. Increase crop yield.
B. Enhance soil fertility.
C. Crop damage and loss.
D. Reduce water consumption.
31. Which type of light creates clearer
shadows?
A. Dim light B. Direct light
C. Flickering light D. Scattered light
32. What does the kWh unit represent?
A. Kilowatt-hours
B. Energy consumption over time
C. Kilowatts per hour
D. Kilowatt resistance
33. What causes the formation of shadows?
A. Reflection of light.
B. Absorption of light.
C. Blocking of light by an object.
D. Dispersion of light
34. Which acid is found in citrus fruits like
Lemons and oranges?
A. Acetic acid B. Citric acid
C. Hydrochloric acid D. Sulfuric acid
35. What process in the nitrogen cycle involves
bacteria converting nitrogen gas into ammonia?
A. Nitrogen fixation B. Nitrification
C. Denitrification D. Decomposition
36. In what direction does a shadow form in
relation to a light source?
A. Behind B. Next to
.C. Opposite D. In front of
37. During incomplete metamorphosis,
how many stages does a grasshopper undergo?
A. Two B. Four
.C. Five D. Three
38. Which component of the blood is primarily
responsible for clotting?
A. Red blood cells B. White blood cells
.C. Plasma D. Platelets
39. What is the first step of the nitrogen cycle?
A. Denitrification B. Nitrification
C. Nitrogen fixation D. Ammonification
40. What is the relationship between power,
energy, and time?
A. Energy = Power × Time
B. Power = Energy × Time
C. Time = Energy × Power
D. Energy = Power ÷ Time
PAPER TWO
This paper is in two sections: A and B. Answer
Question 1 (compulsory) in Section A and any
other three questions in Section B. Answer all
the questions in your answer booklet.
Credit will be given for clarity of expressions
and orderly presentation of materials.
SECTION A [40 marks]
[Compulsory]
Answer all the questions in this section.
1. (a) The diagram below is an illustration of a
system in humans. Study the diagram and
answer the questions that follow.
(i) State one function each of the parts
labelled I, V and VI. [3 marks]
(ii) Explain briefly how air gets into II.
[2 marks]
(iii) Name two diseases that can affect the parts
labelled II. [2 marks]
(iv) Outline the path taken by atmospheric air
before it reaches II. [3 marks]
(b) The diagram below illustrates how images
are formed by pinhole camera. Study it carefully
and answer the questions that follow.
(i) Identify the parts labelled I, II, III, IV and
V. [5 marks]
(ii) State the observation that could be made in
the image if the:
(𝛼) image distance and object distance are
equal; [1 mark]
(𝛽) pinhole is made smaller; [1 mark]
(𝛾) pinhole is enlarged. [1 mark]
(iii) State two characteristics of the image formed
in the pinhole camera. [2 marks]
(c) Below illustrates an experiment in which a
learner added some quantities of hydrochloric
acid to some quantity of sodium hydroxide
solution of the same concentration.
(i) State one function each of the parts labelled
I, II, III and IV. [4 marks]
(ii) Mention one instrument that could be used
to transfer the solution into II. [2 marks]
(iii) What is the name of the reaction that
occurred between dilute hydrochloric acid and
sodium hydroxide solution? [2 marks]
(iv) What is the name of the compound that
would be left in an evaporating dish if the liquid
mixture III is heated? [2 marks]
