12
Q:

Steel contains

A) no carbon B) < 2% of carbon
C) > 10% of carbon D) > 29% of carbon

Answer:   B) < 2% of carbon



Explanation:

To make steel, iron ore is first mined from the ground. It is then smelted in blast furnaces where the impurities are removed and carbon is added.

In simple, steel is iron alloyed with carbon, usually 0 - 2%.

Subject: Chemistry
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Q:

Nitric acid does not react with

A) Gold B) Copper
C) Zinc D) Iron
 
Answer & Explanation Answer: A) Gold

Explanation:
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2 15
Q:

All isotopes of the same element have ____________

A) different atomic numbers and different atomic mass B) different atomic numbers and the same atomic mass
C) the same atomic number but different atomic masses D) the same atomic number and the atomic mass
 
Answer & Explanation Answer: C) the same atomic number but different atomic masses

Explanation:
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0 3
Q:

Which one of the following forms of phosphorus is most reactive?

A) Black phosphorus B) White phosphorus
C) Violet phosphorus D) Red phosphorus
 
Answer & Explanation Answer: B) White phosphorus

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1 16
Q:

Calcium salts used as fertilizer is:

A) Calcium Carbide B) Calcium Carbonate
C) Calcium Cyanide D) Calcium Sulphate
 
Answer & Explanation Answer: D) Calcium Sulphate

Explanation:
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1 8
Q:

Which one of the following is an ohmic conductor?

A) Germanium B) Silicon
C) Carbon D) Silver
 
Answer & Explanation Answer: D) Silver

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0 19
Q:

The commonly used coolant in refrigerators is

A) Ammonia B) Nitrogen
C) Freon D) Oxygen
 
Answer & Explanation Answer: C) Freon

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0 3
Q:

Phosphorus is kept in water because

A) its ignition temperature is very high B) its ignition temperature is very low 
C) its critical temperature is high D) its critical temperature is low
 
Answer & Explanation Answer: A) its ignition temperature is very high

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1 8
Q:

The depletion in Ozone layer is caused by ___________ .

A) Nitrous oxide B) Carbon dioxide
C) Chlorofluorocarbons D) Methane
 
Answer & Explanation Answer: C) Chlorofluorocarbons

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