Q:

Which sample of matter is a mixture?

A) KBr (S)	B) NaCl (L)
C) K (S)	D) NaCl (Aq)

Answer & Explanation Answer: D) NaCl (Aq)

Explanation:

Mixtures are combination of two or more substances physically which can be separated in to the original.

Matter can be breakdown into two categories.

1) Pure substances

2) Mixtures

Here in the given options, options A, B, C are pure substances as they are indicated as S & L in brackets. Option D) is an aqueous solution, that can be dissolved in water.

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Filed Under: Chemistry
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7 7520

Q:

Who Invented Worldwide Standard Time Zones ?

A) Charles Richard Drew	B) Henry W. Seely
C) Jesse Wilford Reno	D) Sir Sandford Fleming

Answer & Explanation Answer: D) Sir Sandford Fleming

Explanation:

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Filed Under: Inventions

4 7515

Q:

Function of Leghaemoglobin in nitrogen fixation _____

A) Absorption of oxygen	B) Nutrion of bacteria
C) Absorption of light	D) All

Answer & Explanation Answer: A) Absorption of oxygen

Explanation:

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32 7499

Q:

Variable number of tandem repeats (VNTRs) in the DNA molecule are highly useful in

A) Recombinant DNA technology	B) Monoclonal antibody production
C) Stemcell culture	D) DNA fingerprinting

Answer & Explanation Answer: D) DNA fingerprinting

Explanation:

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23 7498

Q:

The Sunga ruler Bhaga erected a monolithic 'Garuda' at

A) Varanasi	B) Besnagar
C) Rajagriha	D) Pataliputra

Answer & Explanation Answer: B) Besnagar

Explanation:

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4 7496

Q:

If a body weighs 12N on the surface of the earth, how much will it weigh on the surface of the moon where acceleration due to gravity is only one-sixth of that on earth's surface?

A) 12N	B) 2N
C) 10N	D) 6N

Answer & Explanation Answer: B) 2N

Explanation:

Weight is mass x g. Since mass is constant and g is only ${\frac{1}{6}}^{t h}$ of that on the earth. The weight on the moon is only ${\frac{1}{6}}^{t h}$ of that on the earth.

Therefore 2N i.e (b) is the answer.

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Filed Under: Physics
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14 7495

Q:

Which of the following has the highest entropy?

A) Hydrogen	B) Diamond
C) Liquid nitrogen	D) Mercury

Answer & Explanation Answer: A) Hydrogen

Explanation:

Entropy is a measure of disorder . It will be maximum in gases followed by liquids and least in solids.

Hence, here the gas is only hydrogen and it has the highest entropy.

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8 7492

Q:

Branch of biology in which we study about cultivation of flowering plant

A) Phenology	B) Floriculture
C) Agronomy	D) Botany

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