Science class 10th Online Quiz

Chlorine is a halogen and a non-metal, whereas Sodium, Calcium, and Iron are metals.

Carbon dioxide is a primary greenhouse gas that traps heat in the atmosphere. Oxygen, Nitrogen, and Hydrogen do not have the same heat-trapping properties.

Solar power is a renewable energy source because it is derived from the sun, which is inexhaustible on human timescales. Coal and natural gas are fossil fuels, while nuclear energy relies on finite uranium.

Red blood cells contain hemoglobin, a protein that binds to oxygen and transports it from the lungs to the rest of the body.

Condensation is the phase change where gas (water vapor) turns into liquid (water droplets). Evaporation is the reverse, and sublimation is solid to gas.

Burning wood is a chemical change because it involves a reaction with oxygen to form new substances like ash and carbon dioxide. Melting, breaking, and crushing are physical changes.

The cell is the basic structural and functional unit of all living organisms. Atoms and molecules are smaller but are not considered units of life.

The common cold is primarily caused by rhinoviruses. Bacteria, fungi, and protozoa are different types of pathogens that cause other diseases.

Jupiter is the largest planet in the solar system, with a mass more than twice that of all the other planets combined.

The circulatory system consists of the heart, blood, and blood vessels. The lungs are part of the respiratory system.