Grade 10 Science Challenge

What is the unit of electric current?

• B

• D

• C

• A

Answer explanation

The unit of electric current is represented by the symbol 'A', which stands for Amperes. Therefore, the correct answer is A.

Which element is the basis of organic chemistry?

• Nitrogen

• Carbon

• Hydrogen

• Oxygen

Answer explanation

Carbon is the basis of organic chemistry due to its unique ability to form long chains and complex structures, essential for organic compounds.

What is the atomic number of Carbon?

• 6

• 5

• 8

• 7

Answer explanation

The atomic number of Carbon is 6, which corresponds to the number of protons in the nucleus of a Carbon atom.

What happens to light when it passes from air to glass?

• Refraction

• Reflection

• Absorption

• Diffraction

Answer explanation

When light passes from air to glass, it undergoes refraction, which is the bending of light as it enters a different medium.

What is the process of using living organisms to develop products?

• Biotechnology

• Genetic engineering

• Bioengineering

• Microbiology

Answer explanation

The process of using living organisms to develop products is known as Biotechnology, making it the correct choice among the options provided.

How can we conserve natural resources for future generations?

• By depleting ecosystems, implementing regulations to encourage overexploitation, and not considering future generations

• By wasting resources, ignoring environmental impacts, and promoting unsustainable practices

• By increasing consumption, disregarding conservation efforts, and exploiting resources without limits

• By reducing, reusing, and recycling materials, promoting sustainable practices, protecting ecosystems, and implementing regulations to prevent overexploitation.

Answer explanation

By reducing, reusing, and recycling materials, promoting sustainable practices, protecting ecosystems, and implementing regulations to prevent overexploitation.

What type of energy is obtained from natural sources like sunlight and wind?

• Nuclear energy

• Nonrenewable energy

• Fossil fuel energy

• Renewable energy

Answer explanation

Renewable energy is obtained from natural sources like sunlight and wind, making it the correct choice.

What type of lens can converge light rays to a single point?

• Convex lens

• Concave lens

• Flat lens

• Diverging lens

Answer explanation

A convex lens can converge light rays to a single point by refracting them towards a focal point, making it the correct choice.

What force keeps planets in orbit around the sun?

• Friction

• Magnetism

• Wind

• Gravity

Answer explanation

Gravity is the force that keeps planets in orbit around the sun.

What is the basic unit of life?

• organism

• atom

• molecule

• cell

Answer explanation

The basic unit of life is a cell, which is the correct choice as it is the smallest structural and functional unit of an organism.