Best Brain March 2026 Science
Best Brain March 2026 Science - Paper 1 - Objective Instructions
Answer all the questions. Each question is followed by four options lettered A to D. Find out the correct option for each question and shade in pencil on your answer sheet the space which bears the same letter as the option you have chosen. Give only one answer to each question.
Question 1
Which planet is known as Earth's twin due to its similar size and composition?
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Question 2
Which of the following actions can help reduce your carbon footprint?
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Question 3
Which of the following best describes biodiversity?
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Question 4
Which part of the ear is responsible for converting sound vibrations into neural signals?
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Question 5
Sodium hydroxide is a key ingredient in soap making because it
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Question 6
How does elevation affect climate?
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Question 7
Which breed of cattle is primarily raised for milk production?
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Question 8
A major reservoir of carbon in the carbon cycle is
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Question 9
When groundnut paste is mixed with water the mixture formed is
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Question 10
A common breed of pig known for its rapid growth and good meat quality is
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Question 11
In the water cycle precipitation refers to
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Question 12
The primary diet of housefly larvae is
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Question 13
The fish species which is widely farmed in freshwater aquaculture is
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Question 14
The nymph of a grasshopper: I. is smaller than the adult. II. do not feed on anything. III. molts several times into adulthood. IV. do not have fully developed wings.
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Question 15
In a closed system the total amount of energy
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Question 16
The most vital nutrient in poultry feed is
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Question 17
The planet Mercury: I. is largest planet in our solar system. II. is the closest planet to the Sun. III. has no moons or rings. IV. is covered in a layer of dust.
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Question 18
The primary consideration when selecting feed for a dairy cow is
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Question 19
If more resistors are added in series in a circuit the total resistance
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Question 20
The role of minerals in animal feed is to
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Question 21
The mechanical advantage of a pulley system is determined by the
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Question 22
Which color of light has the longest wavelength?
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Question 23
The pitch of a sound is determined by its
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Question 24
The unit of measurement for the loudness of sound is
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Question 25
High biodiversity typically indicates
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Question 26
Which of the following human activities is a major threat to biodiversity?
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Question 27
The process that powers the sun is called
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Question 28
Which type of climate is typically found at high altitudes?
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Question 29
The sperm cell is a specialized cell that: I. is covered by a cap-like structure. II. has a nucleus that contains genetic material. III. It has a long whip-like tail. IV. is small and streamlined.
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Question 30
One characteristic of a well-prepared seed bed is
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Question 31
When an object is in forward bias in an electronic circuit
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Question 32
Which digestive organ produces insulin?
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Question 33
Which planet has a day longer than its year?
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Question 34
Which of the following is a form of potential energy?
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Question 35
A wedge is used to
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Question 36
Sound energy travels fastest through
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Question 37
Kinetic energy depends on
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Question 38
Which inner planet has no atmosphere?
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Question 39
The layer of the sun that we can see is the
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Question 40
According to Newton's Third Law: I. every action has an effect. II. for every effect there is a cause. III. there is no action without a corresponding reaction.
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Question 41
Study the table on atomic elements and complete it by supplying the missing atomic numbers, element names, symbols, electronic configurations, and valence electrons.
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Question 42
Study the table on atomic elements and draw the electronic structures of the elements with atomic numbers 1 and 8.
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Question 43
If the elements with atomic numbers 1 and 8 lose and gain their outermost electrons respectively, give the symbols of the ions formed.
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Question 44
A compound commonly found in everyday life is formed between the elements with atomic numbers 1 and 8. Write a word equation and a balanced chemical equation for the reaction.
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Question 45
The diagrams show domestic animals labelled I, II, III, IV, V and VI. Name the animals and give one example of a breed for each.
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Question 46
The diagrams show domestic animals labelled I and VI. State three differences between animal I and animal VI.
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Question 47
The diagrams show domestic animals labelled IV and V. Give the difference between the digestive systems of animal IV and animal V.
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Question 48
The diagrams show domestic animals. State four commercial uses of domestic animals.
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Question 49
The diagram illustrates an experiment to show the relationship between magnetism and Newton’s Second Law of Motion. State Newton’s Second Law of Motion and give the factors that affect how fast the paper clips accelerate towards the nail.
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Question 50
In the magnetism experiment shown, what is the role of the battery in the circuit?
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Question 51
In the magnetism experiment shown, explain how the distance between the nail and the paper clips affects the force acting on the paper clips.
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Question 52
In the magnetism experiment shown, what happens if the paper clips are replaced with a coin of twice the mass while keeping the same coils around the nail and the same voltage?
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Question 53
In the magnetism experiment shown, state the law of magnetism and give two industrial uses of magnets.
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Question 54
The diagram shows the metamorphosis of a housefly. Explain why the metamorphosis shown is complete or incomplete.
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Question 55
The diagram shows the metamorphosis of a housefly. Identify the stages labelled I, II, III and IV.
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Question 56
The diagram shows the metamorphosis of a housefly. Identify four breeding places of houseflies.
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Question 57
The diagram shows the metamorphosis of a housefly. List four diseases that are caused by the activities of the housefly.
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Question 58
The diagram shows the metamorphosis of a housefly. Give two ways to control the effects of houseflies on humans.
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Question 59
Differentiate between hail and sleet.
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Question 60
Give four reasons why the water cycle is important in life.
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Question 61
Describe what happens in the mouth during digestion of food.
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Question 62
Name the three end products of food digestion and their sources.
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Question 63
State two characteristics of ruminants.
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Question 64
State two characteristics of monogastric animals.
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Question 65
State two characteristics of monogastric herbivores.
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Question 66
An object situated at a height of 8 m has a potential energy of 170 J. Find the mass of the body, taking g = 10 m/s².
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Question 67
An object situated at a height of 8 m has a potential energy of 170 J. If the object has a velocity of 9 m/s, determine its kinetic energy.
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Question 68
Draw the waste management pyramid and explain two good waste management practices.
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Question 69
State four impacts of waste substances on the environment.
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Question 70
Distinguish between autotrophic and heterotrophic nutrition.
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Question 71
Explain symbiosis and describe the three main types of symbiotic relationships in an ecosystem.
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Question 72
What is organic farming?
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Question 73
Give two differences between organic farming and conventional systems of farming.
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Question 74
Explain the difference between nuclear fusion and nuclear fission.
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Question 75
Give two ways to reduce the negative effects of nuclear electric power generation on the environment.
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Question 76
Give two adaptations of a woodpecker to life on trees.
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Question 77
Give four adaptations of fish for living in aquatic ecosystems.
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Question 78
What are isotopes?
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Question 79
Give two examples of isotopes.
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Question 80
Describe how a spade is used as an agricultural tool.
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Question 81
Describe how a mattock is used as an agricultural tool.
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Question 82
Give two advantages of using solar energy as an energy source.
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Question 83
State two disadvantages of using solar energy as an energy source.
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Question 84
What are electrovalent compounds?
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Question 85
Give two examples of electrovalent compounds.
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Question 86
Give four industrial uses of bacteria.
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Question 87
Mention two natural causes of climate change.
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Question 88
State four effects of global warming.
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Question 89
Mention three warning signs of periodontal disease.
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Question 90
Mention three ways of keeping the teeth clean.
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