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Q:

The number of electron levels in a magnesium atom is

A) 3 B) 2
C) 1 D) 0
 
Answer & Explanation Answer: A) 3

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Filed Under: Chemistry
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Q:

What element is used to disinfect swimming pools?

A) Fluorine B) Chlorine
C) Bromine D) Sulphur
 
Answer & Explanation Answer: B) Chlorine

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Q:

What reacts with oxygen to produce rust?

A) Aluminium B) Silver
C) Copper D) Iron
 
Answer & Explanation Answer: D) Iron

Explanation:

Iron reacts with oxygen in the presence of moisture or water to form a red oxide called rust and the reaction involved is called as Redox reaction.

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Q:

Which is an example of an endothermic reaction?

A) combustion B) mix of CaO with water
C) coal is burnt D) photosynthesis
 
Answer & Explanation Answer: D) photosynthesis

Explanation:

A chemical reaction in which involves the absorption of heat from the environment is called a Endothermic reaction. 

Examples : Dissolving ammonium chloride in water, photosynthesis, melting ice cubes, mixing of potassium chloride with water,...

 

In the contrast, chemical reactions involving release of heat are known as exothermic reactions.

Examples : Combustion, coal is burnt, mix of CaO with water,...

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Filed Under: General Science
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2 1848
Q:

An object having the capability to do work is said to possess

A) Inertia B) Force
C) Pressure D) Energy
 
Answer & Explanation Answer: D) Energy

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Filed Under: Physics
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Q:

An electric iron of 750 W is used for S hours per day. Then the energy consumed in one day by the iron is:

A) 6 units B) 600 units
C) 0.6 units D) 60 units
 
Answer & Explanation Answer: A) 6 units

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Filed Under: Physics
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1 1848
Q:

Select the synonym of
consolidate

A) centralize B) variate
C) declare D) announce
 
Answer & Explanation Answer: A) centralize

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Filed Under: English
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Q:

Improve the bracketed part of the sentence.
Bull markets, John Templeton said, are born on pessimism, grow on scepticism, mature on optimism and (die for) euphoria.

A) die on B) die at
C) die above D) No improvement
 
Answer & Explanation Answer: A) die on

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