Best brain science mock may 2022
Section A objectives. Best brain science mock may 2022.
1.a. the table below contains the first ten elements in the periodic table.
I. Write the names and the chemical symbols of elements 1′ 3, 6 and 8
Ii. Draw the electronic configuration of elements one and eight in the table
III. What is the group name of elements two and ten in the table above?
IV. Name the elements in the table above that are metals.
V. A common compound in every day life is formed from a reaction between elements one and eight
a. Name the substance formed
b. Write a word equation for the reaction
c. Write a balanced chemical equation for the reaction.
b. The diagrams below are illustrations of some farm tools. Study the diagrams carefully and answer the questions that follow
I. Identify each of the tools labeled A, B, C and D.
Ii. State the use of each of the tools labeled A, B, C and D.
III. Briefly describe how tool A is used
IV. State two ways of maintening tool C.
V. State two precautions that must be taken when using D.
c. The diagrams below are illustrations of two different thermometers. Study them carefully and answer the questions that follow.
I. Identify the types of thermometers shown as A and B.
Ii. Name the parts labeled I, II, III, and IV
III. Give two reasons why II is suitable for use in most thermometers
IV. State two reasons why water can not be used in placed of II.
V. State the principle on which thermometers And B work
d. The diagram below represents the process of fertization in a flowering plant. Study it carefully and answer the questions that follow
I. Explain the process shown above
Ii. What is the end product of the process above
III. Identify the parts labeled I, II, III and IV
IV. State the function of each of the parts labeled I and III.
V. Name and explain the process which occurs before the above process.
Solution to question number one. Bece best brain science mock may questions and answers.
1. a. I.
III. Group name of helium and neon
– rare gases or inert gases or noble gases
IV. Elements that are metals
– lithium
-beryllium
V. a. Name of Substance formed
– water
b. Word equation for the reaction
Hydrogen+ Oxygen _Water
c.. balanced chemical equation for the reaction
2H2 + O2_ 2H2O
Best brain science mock may questions and answers
b. I. Identification of tools
A- hand fork.
B- sickle
C- Hoe.
D- Knapsack sprayer
Ii. Uses of the tools
A- for stirring the soil
B- for harvesting rice.
C- for weeding
D- for applying pesticides, weedicides, fungicides, and liquid fertilizer on crops.
III. How tool A is used
It is held firmly by the handle and prongs push into the soil. The soil is turn over.
IV ways of maintening tool C
– oiling metal parts
-wash tool after use.
-should be sharpened when blunt
– keep it in a cool dry place outside termites
V. Precautions taken when using tool D.
– spraying should be done in the morning
– wear protective clothing when using the device
– spraying should not be done when it threatens to rain or during windy days
Best brain science mock may questions and answers
c. I. Identification of thermometers
A- laboratory thermometer.
B- clinical thermometer
Ii. Names of the parts labeled
I- glass tube
II- mercy
III-bulb.
IV-kink/constriction
III. Reasons why mercury (II) is used in most thermometers
– it is opaque
– it is a good conductor of heat
-it has a high boiling point
– it does not wet glass
IV. Why water is not used in thermometers
-it wet glass
– it has abnormal expansion
– it is colourless hence can not be easily seen
– it is sensitive to heat
– it is transparent.
V. Principle used by thermometer I and II to operate
Liquid expands when heated and contracts when cooled
Best brain science mock may questions and answers
d. I. Explanation of the process
Fertilization is the fusion of male and female sex cells to form a zygote. Or it occurs when the male sex cell from the pollen grains flows into the female sex cells in the ovule.
Ii. End product of the process
Fruits and seeds formation
III. Identification of parts
I- pollen grains
II- pollen tube
III- ovary.
V- ovule
IV. Functions of I and II
I- the pollen grains is the male sex cells that fuses with the female sex cells to form a zygote.
II- the ovary contains the ovule
V. Process that occurs before fertization
– pollination- it is the transfer of a matured pollen grains from the anther to the stigma of a matured flower.
Section B theory questions and answers
2. a. I. What is transplanting in vegetable crop production?
Ii. Give two activities needed to ensure successful transplanting.
III. State two characteristics of a good vegetable seedling.
b. Methane burns in air to produce water and carbon dioxide. Write a balanced chemical equation for the reaction
c. I. Explain two processes of heat transfer
Ii. Describe two ways in which the thermos flask works to prevent any of the heat transfer processes.
d. I. Give two difference between a food chain and food web
Ii. Describe how ways of restoring the balance in an ecosystem.
3. a. I. What is neutralization reaction?
Ii. How will you determine that a neutralization reaction is complete?
b. I. Name two breeding places of mosquitoes
Ii. Describe the biological method of controlling mosquitoes
c. I. Give two benefits of soil in agriculture
Ii. State two uses of soil water to plants
III.identify two harmful effects of bush burning on agricultural soils
d. I. Give two uses of knowledge of density in science
Ii. Explain how sinking and floating are related to density.
Best brain science mock may questions and answers
4. a. I. Describe two ways by which seeds can be sown on beds.
Ii. List any two tools used in making vegetable beds
b.i. what is a solvent?
Ii. Mention two industrial Uses of solvents
c. I. How would you use a compass to determine the poles of a magnet?
Describe the stroking method of magnetism
d.i. What is light emitting diode (LED)
Ii. Give two uses of diodes
5.a. I explain two methods of separating liquid-liquid mixtures
Ii. State two separation methods used in gari prossessing
b. Explain why the length of the year differs from planet to planet
c.i. give two benefits of legumes in crop rotation programme.
Ii. State two principles of crop rotation
III. Mention two advantages of crop rotation
d. Explain why an expired air contains more carbon dioxide than inhaled air
6.a. I name four parts of human tooth and give their functions
Ii.state four ways of preventing dental disorder .
b. Explain why the volume of water in a measuring cylinder rises when a stone is dropped into it.
c. I. Explain why gas particles diffuse rapidly.
Ii. State four factors that determine the rate of of diffusion.
d. I. State four benefits of mixed farming
Ii. Give two reasons for controlling weeds on your vegetable farm
Solution to theory questions. Best brain science mock may 2022 examination questions and answers
2.ai .transplanting is it the act of transferring seedlings from the nursery bed to a permanent field.
Ii. Activities to ensure successful transplanting
– watering the seedlings before transplanting
– water after transplanting
– mulch after transplanting
III. Characteristics of a good vegetable seedlings.
– free from diseases
-viable for growth
– it is high yielding
– free from physical deformity
b. Balanced chemical equation for the reaction
CH4 + 2O2 _2H2O + CO2.
c. I. Two heat transfer processes
– conduction- movement of heat through solids
– convection- movement of heat through liquids and gases
– radiation- the transfer of heat that does not require any material medium
.Ii. Ways thermos flask heat loss
– the double walls and the cork prevent heat loss by conduction
– the vaccum prevent heat gain or loss by convection
– the shiny surface prevent heat loss by radiation
Best brain science mock may questions and answers
Theory answers and objectives will follow shortly
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