Q:

Where does hydroelectric energy come from?

A) Air	B) Water
C) Solar	D) All of the above

Answer & Explanation Answer: B) Water

Explanation:

Hydroelectricity is electricity produced from hydropower i.e, water.

Where_does_hydroelectric_energy_come_from1536043070.jpg image

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Q:

Heat transfer by radiation mainly depends upon

A) Kind and extent of its surface	B) Its temperature
C) Nature of the body	D) All of the above

Answer & Explanation Answer: D) All of the above

Explanation:

Heat transfer through radiation takes place in form of electromagnetic waves mainly in the infrared region. It depends on nature of the body, its temperature and kind & extent of its surface.

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Q:

Which command displays the present workig directory in UNIX?

A) $who	B) $pwd
C) $who are you	D) None

Answer & Explanation Answer: B) $pwd

Explanation:

$pwd - present working directory

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Q:

In addition to nitric acid, another acid which may render iron passive is

A) acetic acid	B) oxalic acid
C) chromic acid	D) citric acid

Answer & Explanation Answer: C) chromic acid

Explanation:

Passivity of iron is due to formation of an extremely thin and impervious film of ferrosoferric oxide $[F e_{3} (O_{4})]$ on the surface of iron. Chromic acid, being a powerful oxidising agent (like nitric acid ) renders iron passive.

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Q:

The main buffer system of the human blood is

A) H2CO3	B) H2SO4
C) CO2	D) O3

Answer & Explanation Answer: A) H2CO3

Explanation:

the_main_buffer_system_of_the_human_blood_is1556690852.jpg image

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Q:

Who is the author of the book ' The Goldfinch'

Answer

Donna Tratt

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Q:

Indus Valley Civilization is called the protohistoric civilization because its people knew

A) art	B) writing
C) copper	D) pottery

Answer & Explanation Answer: B) writing

Explanation:

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Filed Under: General Awareness

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Q:

Which track and field star overcame childhood polio to became one of the greatest athlets of her time

A) Wilma Rudolph	B) Gail devers
C) Florence Griffith Joyner	D) Jackie Rrobinson

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