Q:

Process of gaining electrons is known as _____.

A) oxidation	B) reduction
C) radiation	D) both oxidation and reduction

Answer & Explanation Answer: B) reduction

Explanation:

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Q:

Which waves cannot be transmitted through vacuum?

A) Electromagnetic	B) Light
C) Sound	D) Heat

Answer & Explanation Answer: C) Sound

Explanation:

Sound waves cannot be transmitted through vacuum.

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Q:

The energy in most ecosystems comes from

A) Water	B) Carbon dioxide
C) Sun	D) Soil

Answer & Explanation Answer: C) Sun

Explanation:

The energy in most ecosystems comes from sun light.

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Q:

The sentences given with blanks are to be filled with an appropriate word(s). Four alternatives are suggested for each question. For each question, choose the correct alternative and click the button corresponding to it.

The villager cried __________ his voice for help

A) on the top of	B) in the top of
C) from the top of	D) at the top of

Answer & Explanation Answer: D) at the top of

Explanation:

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Q:

Which nutrients provide energy?

A) Carbohydrates	B) Proteins
C) Vitamins	D) All of the above

Answer & Explanation Answer: D) All of the above

Explanation:

The nutrients that provide energy are carbohydrates, proteins and vitamins. The other three nutrients--vitamins, minerals, and water do not provide energy.

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Q:

The mechanism of material removal in EDM process is

A) Erosion and Cavitations	B) Cavitations and Evaporation
C) Melting and Evaporation	D) Melting and Corrosion

Answer & Explanation Answer: C) Melting and Evaporation

Explanation:

Electrical discharge machining (EDM), also known as spark machining, spark eroding, burning, die sinking, wire burning or wire erosion, is a manufacturing process whereby a desired shape is obtained by using electrical discharges.

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Q:

The pressure of a fluid varies with depth h as P = PQ+pgh, where p is the fluid density. This expression is associated with

A) Pascal’s law	B) Newton’s law
C) Bernoulli’s principle	D) Archimedes’ principle

Answer & Explanation Answer: A) Pascal’s law

Explanation:

Pascal's law is a principle in fluid mechanics that states that a pressure change occurring anywhere in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere.

This principle is stated mathematically as: P= P + rgh

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Q:

The Motto of Defence academy?

A) Do or Die	B) Service Before Self
C) YES, OF COURSE WE CAN, RIGHT?	D) Yours is here

Answer & Explanation Answer: B) Service Before Self

Explanation:

The National Defence Academy is formed by combining the cadets of three services Army, Navy and Air force. The Defence academy established on 7 December 1954. Its motto is "Service Before Self."

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