Q:

Propyne and propene can be distinguished by

A) AgNO₃ in ammonia	B) conc. H₂SO₄
C) dil. KMnO₄	D) Br₂ in CCl₄

Answer & Explanation Answer: A) AgNO₃ in ammonia

Explanation:

Propene, being an alkene, and propyne, being a alkyne, are distinguished using the common chemical tests namely ammoniacal silver nitrate or ammoniacal cuprous chloride. Ammoniacal silver nitrate is also called as Tollen's reagent.

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Q:

When does the sun shine vertically on the Equator ?

A) Throughout the year	B) For six months
C) Twice a year	D) Once a year

Answer & Explanation Answer: C) Twice a year

Explanation:

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Q:

India's first Railway University will come up at

A) Vadodara, Gujarat	B) Bengaluru, Karnataka
C) Hyderabad, Andra Pradesh	D) Lucknow, Uttar Pradesh

Answer & Explanation Answer: D) Lucknow, Uttar Pradesh

Explanation:

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Q:

The space shuttle which took Sunita Williams beyond earth was

A) Challenger	B) Galileo
C) Discovery	D) Voyager-2

Answer & Explanation Answer: C) Discovery

Explanation:

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Q:

At what temperature (in Fahrenheit) pure water freezes?

A) 32	B) 0
C) 48	D) 37

Answer & Explanation Answer: A) 32

Explanation:

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Q:

Which of the following is false with reference to a photo-voltaic cell?

A) It is another name as solar cell	B) It can be used as infra-red detectors
C) It can store light energy in the form of electrical energy	D) It converts electric energy into light energy

Answer & Explanation Answer: D) It converts electric energy into light energy

Explanation:

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Q:

________________ refers to the superposing of two or more coherent waves to produce regions of maxima and minima in space, according to the principle of superposition.

A) Interference	B) Rectification
C) Intensity	D) Diffraction

Answer & Explanation Answer: A) Interference

Explanation:

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Q:

Rate of work done is _______.

A) Energy	B) Power
C) Momentum	D) Impulse

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