Q:

What is refractive index ?

A) it is defined as the ratio of speed of light in the medium to the speed of light in vacuum.	B) it is defined as the product of speed of light in medium and in vacuum.
C) it is defined as the ratio of speed of light in vacuum to the speed of light in the medium .	D) None of above

Answer & Explanation Answer: C) it is defined as the ratio of speed of light in vacuum to the speed of light in the medium .

Explanation:

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Filed Under: Physics

3 4713

Q:

Rolling friction is caused by ____ from the following?

A) Non-elastic effects	B) Gravity
C) Power dissipation	D) Buoyancy

Answer & Explanation Answer: A) Non-elastic effects

Explanation:

Rolling friction or rolling drag is the force resisting the motion when a body rolls on a surface. It is mainly caused by non-elastic effects, that is, not all the energy needed for deformation of the wheel, roadbed, etc... is recovered when the pressure is removed.

Another cause of rolling resistance lies in the slippage between the wheel and the surface, which dissipates energy.

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Filed Under: Physics
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10 4713

Q:

The water molecule has a dipole with the negative portion

A) localized on one of the hydrogens	B) localized between the hydrogen atoms
C) pointing toward the oxygen atom	D) pointing from the oxygen through the hydrogen atoms

Answer & Explanation Answer: C) pointing toward the oxygen atom

Explanation:

The water molecule has a dipole with the negative portion pointing toward the oxygen atom.

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Filed Under: Chemistry
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2 4713

Q:

Tone, volume and pace are part of

A) Body language	B) Spoken language
C) Sign language	D) Written language

Answer & Explanation Answer: B) Spoken language

Explanation:

Tone, volume and pace are part of Spoken language.

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Filed Under: English
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3 4713

Q:

Who is the author of the book "No Full Stops in India" ?

A) R. K. Narayan	B) Mark Tully
C) C. Narayan Reddy	D) Ved Mehta

Answer & Explanation Answer: B) Mark Tully

Explanation:

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Filed Under: Books and Authors
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11 4713

Q:

Which of these is unique to flowering plants?

A) double fertilization	B) an embryo surrounded by nutritive tissue
C) haploid gametophytes	D) pollen production

Answer & Explanation Answer: A) double fertilization

Explanation:

In flowering plants one sperm nucleus fertilizes the egg and the other sperm nucleus fuses with two other nuclei found within the ovule, thus forming triploid endosperm.

Hence, double fertilization is unique to flowering plants.

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Filed Under: Biology
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4 4712

Q:

In India, during the last decade the total cultivated land for which one of the following crops has remained more or less stagnant?

A) Rice	B) Oil Seeds
C) Pulses	D) Sugarcane

Answer & Explanation Answer: C) Pulses

Explanation:

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Filed Under: Indian Geography

7 4707

Q:

Jamini Roy is a famous

A) Dancer	B) Magician
C) Cartoonist	D) Painter

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