General Science Elements Metals | General Knowledge Questions and Answers | General Knowledge Free Online-Tests | LucentBlackBoard

01.

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

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

Answer and Explanation

Answer: Mercury

Explanation:
There is no explanation...

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02.

Chemical formula for water is

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

Answer and Explanation

Answer: H2O

subscript

Explanation:
There is no explanation...

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03.

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

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

Answer and Explanation

Answer: magnesium

Explanation:
There is no explanation...

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04.

Washing soda is the common name for

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

Answer and Explanation

Answer: Sodium carbonate

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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05.

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

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

Answer and Explanation

Answer: Hydrogen

Explanation:
In order, the most abundant greenhouse gases in Earth's atmosphere are:

* water vapor
* carbon dioxide
* methane
* nitrous oxide
* ozone
* chlorofluorocarbons

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06.

The gases used in different types of welding would include

A.	oxygen and hydrogen	B.	oxygen, hydrogen, acetylene and nitrogen
C.	oxygen, acetylene and argon	D.	oxygen and acetylene

Answer and Explanation

Answer: oxygen and acetylene

Explanation:
There is no explanation...

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07.

What is laughing gas?

A.	Nitrous Oxide	B.	Carbon monoxide
C.	Sulphur dioxide	D.	Hydrogen peroxide

Answer and Explanation

Answer: Nitrous Oxide

Explanation:
There is no explanation...

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08.

The gas usually filled in the electric bulb is

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

Answer and Explanation

Answer: nitrogen

Explanation:
There is no explanation...

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09.

Which of the following metals remain in liquid for under normal conditions?

A.	Radium	B.	Zinc
C.	Uranium	D.	Mercury

Answer and Explanation

Answer: Mercury

Explanation:
There is no explanation...

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10.

From which mineral is radium obtained?

A.	Rutile	B.	Haematite
C.	Limestone	D.	Pitchblende

Answer and Explanation

Answer: Pitchblende

Explanation:
There is no explanation...

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11.

Permanent hardness of water can be removed by adding

A.	chlorine	B.	washing soda
C.	potassium permanganate	D.	bleaching powder

Answer and Explanation

Answer: bleaching powder

Explanation:
There is no explanation...

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12.

Non stick cooking utensils are coated with

A.	Teflon	B.	PVC
C.	black paint	D.	polystyrene

Answer and Explanation

Answer: Teflon

Explanation:
There is no explanation...

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13.

The most important ore of aluminium is

A.	galena	B.	calamine
C.	calcite	D.	bauxite

Answer and Explanation

Answer: bauxite

Explanation:
Bauxite is an aluminium ore and is the main source of aluminium

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14.

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

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

Answer and Explanation

Answer: Bromine

Explanation:
There is no explanation...

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15.

The element common to all acids is

A.	hydrogen	B.	carbon
C.	sulphur	D.	oxygen

Answer and Explanation

Answer: hydrogen

Explanation:
There is no explanation...

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16.

Balloons are filled with

A.	nitrogen	B.	helium
C.	oxygen	D.	argon

Answer and Explanation

Answer: helium

Explanation:
There is no explanation...

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17.

Which of the following is used as a lubricant?

A.	Graphite	B.	Silica
C.	Iron Oxide	D.	Diamond

Answer and Explanation

Answer: Graphite

Explanation:
There is no explanation...

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18.

Which among the following is most important ore of aluminium?

A.	Galena	B.	Calamine
C.	Bauxite	D.	Calcite

Answer and Explanation

Answer: Bauxite

Explanation:
There is no explanation...

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19.

In which of the following activities silicon carbide is used?

A.	Making cement and glass	B.	Disinfecting water of ponds
C.	cutting very hard substances	D.	Making casts for statues

Answer and Explanation

Answer: cutting very hard substances

Explanation:
There is no explanation...

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20.

Which of the following is used in pencils?

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

Answer and Explanation

Answer: Graphite

Explanation:
There is no explanation...

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