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Old Sunday, June 19, 2011
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Default EDS MCQs
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


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


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


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

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


Which of the following is used in pencils?

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


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

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


Chemical formula for water is

A. NaA1O2
B. H2O
C. Al2O3
D. CaSiO3


The gas usually filled in the electric bulb is

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


Washing soda is the common name for

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


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


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

A. Methane
B. Nitrous oxide
C. Carbon dioxide
D. Hydrogen
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  #2  
Old Sunday, June 19, 2011
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you didnt answer this one

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


its A. silicon dioxide
Last edited by Predator; Sunday, June 19, 2011 at 05:21 PM.
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  #3  
Old Tuesday, August 23, 2011
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the gas that is used in bulb is not nitrogen its ARGON.
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Old Tuesday, August 23, 2011
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1) Oxygen Because bronze is an alloy of about 70 % Copper and 30 % zinc. Copper is oxidized in air, thus the discolouration. Hydrogen sulphide is poisonous and it is what gives fart its odour (I am not kidding)

The gas usually filled in the electric bulb is : Nitrogen is correct

Quartz crystals normally used in quartz clocks etc. is chemically: Silica or Silicon dioxide
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