#1. Oil from a mechanic workshop accidentally spilled into a pool of water which was breeding mosquitoes. After sometime, the pool of water was no longer breeding mosquitoes. Which control method may have been deployed?

#2. A student who complained of stomach upset was given first aid with Mg(OH)₂ boldly written on it. What could be the common name of the first aid the student was given?

#3. The building block of a material with the smallest unit of matter that retains the properties of an element is

#4. Which of the following elements has four electron shells?

#5. The consequences of the greenhouse effect on humans include
I. flooding of coastal cities.

II. desertification of fertile areas,

III. increased number of storms,

IV. increased use of fossil fuels.

#6. Which of the following pairs of energy sources is environmentally friendly?

#7. The following devices work based on the principle of pressure in fluids except

#8. A bowl of water on a gas stove was initially cold. It became warm after sometime. What was the mode of heat transfer in the water?

#9. A substance that could be used in large scale treatment of domestic water is

#10. When a stick is dipped into a pool of water, it appears to

#11. A mother took her child to the hospital and upon investigation, it was noticed that the child’s diet was lacking in zinc. What could this result in?
I. Decreased growth in the child

II. Anaemia and constipation

III. Inability of the body to fight infection

#12. Which of the following statements best describes the term green economy? It includes

#13. Two unknown solutions labelled A and B were brought to a JHS 3 class. It was observed that in solution A, red litmus paper changed colour to blue, while in solution B, red litmus paper retained its colour. What could be the content of solution A?

#14. The following processes are chemical changes except

#15. Nitrogen deficiency in soils causes

#16. Chlorophyll helps plants absorb energy from the sun as they undergo the process of photosynthesis. It is located in a structure called

#17. Which of the following electrical appliances can convert electrical energy to heat energy?
I. Electric iron

II. Kettle

III. Water heater

#18. Digestion of rice in humans starts from the

#19. Cockroaches in a cupboard were killed after an insecticide had been sprayed. The insecticide reached the cockroaches by the process of

#20. The energy transformation that occurs when sodium hydroxide is dissolved in water is

#21. The portion of air gas which acts as a solvent is

#22. A livestock farmer wants to achieve good health for the animals being reared. Which of the following activities should be undertaken by the farmer?

I. Have vaccination schedules for the animals

II. Provide balanced ration to the animals

III. Provide good sanitation for the animals

A poultry farmer observed that the layers were producing thin-shelled eggs.

Use this information to answer the question that follows.

#23. The defect identified is mostly caused by a deficiency in

#24. A student is to measure 20 cm³ of a sodium hydroxide solution. what instrument could be used?

An electrical engineer was in your school to replace a 20 W bulb with a 50 W bulb.

Use this information to answer the question that follows.

#25. The 50 W bulb is likely to
I. increase the brightness in the room.

II. increase the amount of electricity consumed.

III. destroy the habitat of pests.

#26. Which of the following sources of energy is non-renewable?
I. Coal

II. Solar

III. Wind

IV. Uranium-236

#27. Which of the following natural cycles directly involves the sun?
I. Carbon cycle

II. Water cycle

III. Nitrogen cycle

#28. A natural phenomenon that illustrates the dispersal of light is

#29. A metallic ladle was left in a boiling soup. After sometime, the handle became hot. This is because the particles in the ladle.

#30. The simplest way of making well water suitable for laundry is by

#31. Grasshopper management is crucial because of all the following reasons except

#32. The primary purpose of respiration in man is to
I. take in oxygen.

II. release carbon dioxide.

III. regulate body temperature.

#33. Canned foods and drinks have expiry dates on them. The hazard involved in taking an expired drink is

#34. An electric bulb is rated 0.5 A, 120 V. Determine the power produced when the bulb is turned on.

#35. Which of the following sets of devices operate on the principle of magnetism?

A poultry farmer observed that the layers were producing thin-shelled eggs.

Use this information to answer the question that follows.

#36. What ingredient could be added to the feed to correct the defect?

#37. In making ornaments and jewellery, non-reactive metals are preferred because they

#38. Which of the following nursery beds is suitable for a flood prone area?

#39. A hunter experiences a backward force upon firing a gun. Which of the Newton’s laws of motion is demonstrated in the situation?

An electrical engineer was in your school to replace a 20 W bulb with a 50 W bulb.

Use this information to answer the question that follows.

#40. The unit inscribed on the bulb measures its