Elements and Metals Science MCQS 1 TO 20
1.
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Brass gets discoloured in air
because of the presence of which of the following gases in air?
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Answer &
Explanation
Answer: Option B
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2.
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Which of the following is a non
metal that remains liquid at room temperature?
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Answer &
Explanation
Answer: Option B
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3.
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Chlorophyll is a naturally
occurring chelate compound in which central metal is
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Answer &
Explanation
Answer: Option B
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4.
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Which of the following is used in
pencils?
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Answer &
Explanation
Answer: Option A
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5.
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Which of the following metals
forms an amalgam with other metals?
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Answer &
Explanation
Answer: Option B
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6.
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Chemical formula for water is
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Answer &
Explanation
Answer: Option B
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7.
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The gas usually filled in the
electric bulb is
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Answer &
Explanation
Answer: Option A
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8.
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Washing soda is the common name
for
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Answer &
Explanation
Answer: Option A
Explanation:
What is the scientific name for
washing soda?
Sodium carbonate (also known as
washing soda or soda ash), Na2CO3 is a sodium salt of carbonic acid.
Scientific name for baking soda?
Sodium bicarbonate or sodium
hydrogen carbonate is the chemical compound with the formula NaHCO3. Sodium
bicarbonate is a white solid that is crystalline but often appears as a fine
powder. Since it has long been known and is widely used, the salt has many
related names such as baking soda, bread soda, cooking soda, and bicarbonate
of soda.
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9.
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Quartz crystals normally used in
quartz clocks etc. is chemically
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Answer & Explanation
Answer: Option A
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10.
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Which of the gas is not known as
green house gas?
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Answer &
Explanation
Answer: Option D
Explanation:
In order, the most abundant
greenhouse gases in Earth's atmosphere are:
* water vapor * carbon dioxide * methane * nitrous oxide * ozone * chlorofluorocarbons |
11.
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Bromine is a
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Answer &
Explanation
Answer: Option B
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12.
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The hardest substance available on
earth is
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Answer &
Explanation
Answer: Option C
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13.
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The variety of coal in which the
deposit contains recognisable traces of the original plant material is
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Answer &
Explanation
Answer: Option D
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14.
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Tetraethyl lead is used as
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Answer &
Explanation
Answer: Option D
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15.
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Which of the following is used as
a lubricant?
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Answer &
Explanation
Answer: Option A
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16.
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The inert gas which is substituted
for nitrogen in the air used by deep sea divers for breathing, is
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Answer &
Explanation
Answer: Option C
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17.
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The gases used in different types
of welding would include
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Answer &
Explanation
Answer: Option D
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18.
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The property of a substance to
absorb moisture from the air on exposure is called
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Answer &
Explanation
Answer: Option B
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19.
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In which of the following
activities silicon carbide is used?
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Answer &
Explanation
Answer: Option C
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20.
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The average salinity of sea water
is
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Answer &
Explanation
Answer: Option B
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