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1
Q:

Mass number is always equal to ______.

 

A) number of protons B) number of neutrons
C) sum of number of protons and number of electrons D) sum of number of protons and number of neutrons

Answer:   D) sum of number of protons and number of neutrons



Explanation:
Subject: Chemistry
Exam Prep: Bank Exams
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The percentage of nitrogen in the air is about

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Answer & Explanation Answer: C) 78%

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Air ___________________ are the substances which contaminate the air.

A) Reactants B) Irritants
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Answer & Explanation Answer: D) Pollutants

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By using which foam the Researchers from Indian Institute of Technology – Bombay have made a low cost piezo resistive vibration sensor?

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Answer & Explanation Answer: B) Only Polyethylene

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Which of the following is NOT a compound?

 

A) Ammonia B) Milk
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Answer & Explanation Answer: B) Milk

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