Q:

The optical phenomenon that is primarily responsible for the observation of rainbow on a rainy day is

A) diffraction	B) interference
C) dispersion	D) reflection

Answer & Explanation Answer: C) dispersion

Explanation:

A rainbow is a natural spectrum appearing in the sky after a rain shower. It is caused by dispersion of sunlight by tiny water droplets, present in the atmosphere. A rainbow is always formed in a direction opposite to that of the Sun. The water droplets act like small prisms. They refract and disperse the incident sunlight, then reflect it internally, and finally refract it again when it comes out of the raindrops.

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Q:

The substances which reduce friction are called _________.

A) irregularities	B) lubricants
C) adhesives	D) viscous

Answer & Explanation Answer: B) lubricants

Explanation:

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Q:

Filament of electric bulb is made of _____.

A) Magnesium	B) Lead
C) Tin	D) Tungsten

Answer & Explanation Answer: D) Tungsten

Explanation:

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Filed Under: Physics
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Q:

The main products of photosynthesis are

A) Oxygen	B) Sugar
C) Both A & B	D) Carbon dioxide

Answer & Explanation Answer: C) Both A & B

Explanation:

The two main products of photosynthesis are sugar and oxygen. Oxygen is emitted as waste product and sugar is used for energy preparation using sun light.

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Q:

In the following question, a sentence has been given in Direct/Indirect speech. Out of the four alternatives suggested, select the one which best expresses the same sentence in Indirect/Direct speech.
He said, "I saw a snake here."

A) He said that he had seen a snake there.	B) He said that he saw a snake here.
C) He said that he saw a snake there.	D) He said that he had seen a snake.

Answer & Explanation Answer: A) He said that he had seen a snake there.

Explanation:

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Filed Under: English
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Q:

Bacteria divide by

A) Binary Fission	B) Spirilla
C) RNA	D) Fusion

Answer & Explanation Answer: A) Binary Fission

Explanation:

Bacteria divided and reproduce by Binary fission. In this process, the bacterium, which is a single cell, divides into two identical daughter cells. Binary fission begins when the DNA of the bacterium divides into two replicates.

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Filed Under: Biology
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Q:

Activation of the receptors by stimuli is called

A) Adaptation	B) Perception
C) Habituation	D) Sensation

Answer & Explanation Answer: D) Sensation

Explanation:

Sensation is the activation of the receptors by stimuli.

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Filed Under: Biology
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Q:

Which European Country provide its currency for Bank of Central African states

A) France	B) UK
C) Netherlands	D) Germany

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