General Science Class 6 MCQS

Among the following, which substance is not a compound?

1. H2O
2. Mg
3. CO2
4. NaCl
5. Na2CO3

Air is the example of a/an:

1. Element
2. Solution
3. Mixture
4. Compound

Which gas is present in air with highest percentage?

1. Nitrogen
2. Hydrogen
3. Oxygen
4. Carbon Dioxide

The most abundant constituent in Air is:

1. Hydrogen
2. Oxygen
3. Nitrogen
4. Carbon Dioxide

Which among the following is not an example of mixture?

1. Common Salt
2. Steel
3. Sharbat
4. Tea

Which of the following are made up of two or more substances that are not chemically combined?

1. Compounds
2. Elements
3. Solutions
4. Mixtures

Which of the following is not the source of carbon dioxide emission?

1. Burning of fossil fuels, wood, cool
2. Solar power
3. Respiration
4. Car exhaust smoke

Which gas among the following is responsible for global warming due to the greenhouse effect?

1. Oxygen (O2)
2. Nitrogen (N2)
3. Carbon Dioxide (CO2)
4. Helium (He)

The process which converts carbon dioxide into glucose is known as?

1. Photosynthesis
2. Respiration
3. Decomposition
4. None

A process of separating insoluble solids from a mixture is called?

1. Crystallization
2. Filtration
3. Distillation
4. Sublimation