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
Ans - B

2. Which of the following is a non metal that remains liquid at room temperature?
A. Phosphorous
B. Bromine
C. Chlorine
D. Helium
Ans - B

3. Chlorophyll is a naturally occurring chelate compound in which central metal is
A. copper
B. magnesium
C. iron
D. calcium
Ans - B

4. Which of the following is used in pencils?
A. Graphite
B. Silicon
C. Charcoal
D. Phosphorous
Ans - A

5. Which of the following metals forms an amalgam with other metals?
A. Tin
B. Mercury
C. Lead
D. Zinc
Ans - B


6. Chemical formula for water is
A. NaAlO2
B. H2O
C. Al2O3
D. CaSiO3
Ans - B

7. The gas usually filled in the electric bulb is
A. nitrogen
B. hydrogen
C.Mcarbon dioxide
D. oxygen
Ans - A

8. Washing soda is the common name for
A. Sodium carbonate
B. Calcium bicarbonate
C. Sodium bicarbonate
D. Calcium carbonate
Ans - 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
Ans - A

10. Which of the gas is not known as green house gas?
A. Methane
B. Nitrous oxide
C. Carbon dioxide
D. Hydrogen
Ans - D