Science
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Cell Structure and Functions
Chemical Effects of Electric Current
Coal and Petroleum
Combustion and Flame
Conservation of Plants and Animals
Crop Production and Management
Force and Pressure
Friction
Light
Materials Metals and Non-Metals
Microorganisms Friend and Foe
Reaching the Age of Adolescence
Reproduction in Animals
Some Natural Phenomena
Sound
Synthetic Fibres and Plastics
Q. If a cell has a volume of 1000 cubic micrometers and a surface area of 600 square micrometers, what is the surface area to volume ratio?
Q. If a certain animal species has a survival rate of 90% each year, what is the probability that at least one of 10 animals will survive after 2 years?
Q. If a certain bacterium doubles its population every 3 hours, how many bacteria will there be after 12 hours if the initial population is 100?
Q. If a certain mold grows to 150% of its size every week, what will be its size after 2 weeks if its initial size is 100 grams?
Q. If a certain plant species is endangered and only 50 individuals are left, what is the percentage decrease if the population was originally 200?
Q. If a certain species of fish can reproduce every 4 months and a single pair can produce 100 offspring each time, how many offspring will there be after 1 year?
Q. If a certain virus has a reproduction rate of 50% every hour, how many viruses will there be after 3 hours if you start with 10 viruses?
Q. If a child is 7 years old now, how many years will they be when they reach 10?
Q. If a crop requires 300 liters of water per week and the farmer has 5 crops, how much water is needed in total per week?
Q. If a culture of bacteria grows from 500 to 2000 in 6 hours, what is the average growth rate per hour?
Q. If a farmer produces 1200 kg of wheat from 2 hectares of land, what is the yield per hectare?
Q. If a farmer wants to increase his yield by 20% and his current yield is 800 kg per hectare, what will be his new yield?
Q. If a farmer's land produces 500 kg of barley per hectare and he has 3 hectares, how much barley does he produce in total?
Q. If a forest area is reduced by 20% and the remaining area is 800 hectares, what was the original area of the forest?
Q. If a metal has a density of 8.96 g/cm³ and a volume of 10 cm³, what is its mass?
Q. If a person is 16 years old now, how many years will they be when they turn 20?
Q. If a person is currently 12 years old, how many years will it take for them to reach 18 years of age?
Q. If a piece of metal weighs 200 grams in air and 150 grams in water, what is the buoyant force acting on it?
Q. If a single bacterium divides every 20 minutes, how many bacteria will there be after 2 hours starting from 1 bacterium?
Q. If a synthetic fiber can stretch up to 5 times its original length, what is the maximum length of a 2-meter fiber?
Q. If a synthetic fiber is 30% lighter than cotton, and a cotton fiber weighs 200 grams, how much does the synthetic fiber weigh?
Q. If a synthetic fiber is produced at a rate of 500 kg per hour, how much fiber will be produced in 8 hours?
Q. If a teenager is 15 years old now, how many years ago were they 10 years old?
Q. If a teenager is currently 13 years old, how many years until they reach 18?
Q. If the cost of producing 1 kg of corn is $0.50 and a farmer produces 1500 kg, what is the total production cost?
Q. If the cost of producing 1 kg of synthetic fiber is $5, what will be the cost to produce 250 kg?
Q. In 2021, which country launched a national strategy to promote the use of electrochemical processes in industrial applications?
Q. In 2021, which major company launched a new line of electric vehicles that utilize advanced battery technology to enhance chemical reactions?
Q. In 2022, which country became the first to use a large-scale electrolysis plant to produce green hydrogen from renewable energy?
Q. In a plant cell, which structure is responsible for photosynthesis?