General Science Questions & Answer

1. Brass gets discoloured in air because of the presence of which of the following gases in air?

A. Oxygen
B. Hydrogen sulphide
C. Carbon dioxide
D. Nitrogen

Answer: B

2. Which of the following is a non metal that remains liquid at room temperature?

A. Phosphorous
B. Bromine
C. Chlorine
D. Helium

Answer: B

3. Chlorophyll is a naturally occurring chelate compound in which central metal is

A. copper
B. magnesium
C. iron
D. calcium

Answer: B

4. Which of the following is used in pencils?

A. Graphite
B. Silicon
C. Charcoal
D. Phosphorous

Answer: A

5. Which of the following metals forms an amalgam with other metals?

A. Tin
B. Mercury
C. Lead
D. Zinc

Answer: B

6. Chemical formula for water is

A. NaAlO2
B. H2O
C. Al2O3
D. CaSiO3

Answer: B

7. The gas usually filled in the electric bulb is

A. nitrogen
B. hydrogen
C. carbon dioxide
D. oxygen

Answer: A

8. Washing soda is the common name for

A. Sodium carbonate
B. Calcium bicarbonate
C. Sodium bicarbonate
D. Calcium carbonate

Answer: A

9. Quartz crystals normally used in quartz clocks etc. is chemically

A. silicon dioxide
B. germanium oxide
C. a mixture of germanium oxide and silicon dioxide
D. sodium silicate

Answer: A

10. Which of the gas is not known as green house gas?

A.Methane
B.Nitrous oxide
C.Carbon dioxide
D.Hydrogen

Answer: D