Science G.K
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 A
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.The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of
A. bromine
B. fluorine
C. chlorine
D. sulphur
Answer: Option D
7.The element common to all acids is
A. hydrogen
B. carbon
C. sulphur
D. oxygen
Answer: Option A
8.Non stick cooking utensils are coated with
A. Teflon
B. PVC
C. black paint
D. polystyrene
Answer: Option A
9.Monazite is an ore of
A. titanium
B. zirconium
C. iron
D. thorium
Answer: Option D
10.Carbon, diamond and graphite are together called
A. allotropes
B. isomers
C. isomorphs
D. isotopes
Answer: Option A