Q:

By volume, 21% of air is _______________.

A) hydrogen	B) oxygen
C) nitrogen	D) carbon dioxide

Answer & Explanation Answer: B) oxygen

Explanation:

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Filed Under: Chemistry
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Q:

Which one of the following mixture is homogeneous?

A) Water and oil	B) Starch and sugar crystals
C) Graphite and charcoal	D) Alloys

Answer & Explanation Answer: D) Alloys

Explanation:

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Q:

Birth control pills contain

A) Progesterone only	B) Estrogen only
C) Mixture of progesterone and estrogen derivative	D) Neither progesterone nor estrogen

Answer & Explanation Answer: C) Mixture of progesterone and estrogen derivative

Explanation:

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Filed Under: Biology
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Q:

Which of the following group does NOT follow Newlands Law of Octaves?

A) Li, Na	B) Be, Mg
C) C, Si	D) Mn, Hg

Answer & Explanation Answer: D) Mn, Hg

Explanation:

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Q:

One who collects coins as hobby

A) Numismatist	B) Philatelist
C) Statistician	D) Ornithologist

Answer & Explanation Answer: A) Numismatist

Explanation:

Numismatist: someone who studies or collects coins, paper money, or medals.

Philatelist: a person who collects stamps.

Ornithologist: a person who studies on birds.

Statistician: an expert in the preparation and analysis of statistics.

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Filed Under: General Science
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Q:

The primary motor cortex is located in the

A) frontal lobe	B) temporal lobe
C) occipital lobe	D) Parietal lobe

Answer & Explanation Answer: A) frontal lobe

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Q:

Consider the following statements :

1. There is no net moment on a body which is in equilibrium.

2. The momentum of a body is always conserved.

3. The kinetic energy of an object is always conserved.

Which of the statements given above is/are correct?

A) 1, 2 and 3	B) 2 and 3 only
C) 1 and 2 only	D) 1 only

Answer & Explanation Answer: C) 1 and 2 only

Explanation:

There are two conditions that must be met for an object to be in equilibrium. The first condition is that the net force on the object must be zero for the object to be in equilibrium. If net force is zero, then net force along any direction is zero.

Kinetic energy (KE) is the energy of motion, and kinetic energy is not always conserved in a collision

Energy and momentum are always conserved.

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Filed Under: Physics
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Q:

Find the work done (in J) when a charge of 20 C moves across a potential difference of 4 V.

A) 5	B) 40
C) 80	D) 10

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