General Science

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: Option 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: Option B



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

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


Answer: Option B


4. Which of the following is used in pencils?

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

Answer: Option A


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

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


Answer: Option B



6. Chemical formula for water is

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

Answer: Option B


7. The gas usually filled in the electric bulb is

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


Answer: Option A


8. Washing soda is the common name for

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


Answer: Option 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: Option A


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

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


Answer: Option D