Q:

An economic system combining private and state enterprise is called as _____

A) Market economy	B) Centrally planned economy
C) Private economy	D) Mixed economy

Answer & Explanation Answer: D) Mixed economy

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Q:

Methane an air pollutant is produced ______.

A) by action of ultraviolet light on nitrogenous compounds.	B) as a by-product of manufacturing ammoniacal fertilizers
C) by burning of coal in insufficient air	D) by digestion of food by animals

Answer & Explanation Answer: D) by digestion of food by animals

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Q:

The Chemical formula of Acetic acid is _____.

A) CH3COH	B) CH3COOH
C) CH3COCH3	D) CH2COOH

Answer & Explanation Answer: D) CH2COOH

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Q:

What are isobars?

A) Elements with same atomic number but different mass number	B) Elements with different atomic number but same mass number
C) Elements with different atomic number and different mass number	D) Elements with same atomic number and same mass number

Answer & Explanation Answer: B) Elements with different atomic number but same mass number

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Q:

What is the process of rust forming on iron called?

A) Rusting	B) Crystallisation
C) Shovel	D) Spade

Answer & Explanation Answer: A) Rusting

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Q:

According to Dalton’s Atomic Theory, the smallest indivisible particles of matter is called ______.

A) molecule	B) atom
C) compound	D) element

Answer & Explanation Answer: B) atom

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Q:

Which of the following compounds is the strongest acid?

A) p-nitrophenol	B) phenol
C) m-nitrophenol	D) p-cresol

Answer & Explanation Answer: A) p-nitrophenol

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Q:

For the aquatic organisms, the source of food is

A) Phytoplankton	B) Sea Weed
C) Aqua plankton	D) Zooplankton

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