Class 10 Science

What is the chemical formula for " Ethane"

• CH6

• C2H

• C2H6O2

• C2H6

Choose the correct option which represent the correct formula of Mirror.

• V + U = F

• 1/f + 1/V = 1/U

• 1/f = 1/v + 1/u

• 1/f - 1/v = 1/u

What is the process of photosynthesis?

• Photosynthesis is the process of plants absorbing nutrients from the soil.

• Photosynthesis is the way in which plants grow by consuming minerals from the air.

• Photosynthesis is the method by which animals breathe oxygen and exhale carbon dioxide.

• Photosynthesis is the process by which plants convert light energy into chemical energy, producing glucose and oxygen from carbon dioxide and water.

Explain the difference between speed and velocity.

• Speed is always constant; velocity can change.

• Speed is a vector; velocity is scalar.

• Speed is scalar; velocity is vector.

• Speed measures direction; velocity measures distance.

What is the pH scale and what does it measure?

• The pH scale measures the density of a solution with cataions.

• The pH scale measures the temperature of a solution and atoms.

• The pH scale indicates the acidic or basic the solution is.

• The pH scale measures the concentration of hydrogen ions in a solution.

Acid + Metal ---> Salt + Hydrogen

• False

• True

What is the role of the nucleus in a cell?

• The nucleus produces energy for the cell.

• The nucleus controls cell activities and stores genetic information.

• The nucleus is responsible for protein synthesis.

• The nucleus transports nutrients within the cell.

Describe the law of conservation of mass.

• Mass is destroyed during chemical reactions.

• Mass is conserved in chemical reactions; it cannot be created or destroyed.

• Mass can be created in chemical reactions.

• Mass is only conserved in physical changes.

What are the main components of an ecosystem?

• Biotic and abiotic components.

• Producers and consumers

• Water and soil nutrients

• All of the above

What is the difference between renewable and non-renewable energy sources?

• Renewable energy sources are derived only from fossil fuels.

• Renewable energy sources are always more expensive than non-renewable sources.

• Non-renewable energy sources can be replenished quickly.

• Renewable energy sources can be replenished naturally, while non-renewable energy sources are finite and will deplete.