Q:

The operating system UNIX is the trademark of

A) Microsoft	B) Bell Laboratories
C) Apple	D) Motorola

Answer & Explanation Answer: B) Bell Laboratories

Explanation:

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Q:

Identify the positive impact of internet in life.

A) Cyber-crimes are on the increase	B) Users suffer from internet addiction disorder
C) Best source of knowledge through a click	D) Leads to less physical activity and poor eye sight

Answer & Explanation Answer: C) Best source of knowledge through a click

Explanation:

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Q:

In which of the following solution the concentration of H+ ion is the maximum?

A) pH 6	B) pH 8
C) pH 5	D) pH 9

Answer & Explanation Answer: C) pH 5

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Q:

Who stated the following law : 'The properties of the elements are the periodic function of their atomic masses'?

A) Dobereiner	B) Moseley
C) Newlands	D) Mendeleev

Answer & Explanation Answer: D) Mendeleev

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Q:

What was the element used in traditional thermometers which is highly toxic in nature?

A) Carbon	B) Mercury
C) Arsenic	D) Cadmium

Answer & Explanation Answer: B) Mercury

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Q:

Which of the following states has the maximum area of Mangrove forest?

A) Rajasthan	B) Uttar Pradesh
C) Sikkim	D) West Bengal

Answer & Explanation Answer: D) West Bengal

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Q:

Which one of the followingis notan allotrope of carbon?

A) Coal	B) Diamond
C) Graphite	D) Graphene

Answer & Explanation Answer: A) Coal

Explanation:

Allotropy is the property of some chemical elements to exist in two or more different forms, or allotropes, when found in nature. There are several allotropes of carbon like diamond, graphite, graphene, fullerene, etc.Coal is not an allotrope of carbon because it is not 100% carbon. It contains lot of silica, sulphur and other compounds of carbon apart from carbon.

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Q:

Warming Ammonium chloride with sodium hydrochloride in a test tube is an example of

A) Open system	B) Closed system
C) Isobaric system	D) Isothermal system

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