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Q:

The metal which reacts most violently with with cold water is

A) calcium	B) sodium
C) magnesium	D) potassium

Answer & Explanation Answer: D) potassium

Explanation:

Potassium reacts violently with water liberating hydrogen. The reaction is so violent that the liberated hydrogen catches fire.

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Filed Under: Chemistry

Q:

Harmful bacteria in drinking water cannot be destroyed by

A) Chlorination	B) boiling
C) adding caustic soda	D) ozonisation

Answer & Explanation Answer: C) adding caustic soda

Explanation:

Water containing caustic soda cannot be used for drinking

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Filed Under: Chemistry

Q:

The electrical domestic tube light gives white fluorescent light because of

A) colision between molecules of filled gas under electric current	B) heavy current
C) vacuum inside the tube	D) falling of ultra violet rays on the white inner coating of the tube

Answer & Explanation Answer: D) falling of ultra violet rays on the white inner coating of the tube

Explanation:

The ultraviolet rays have high frequency and shorter wavelength are converted to visible white light with lower frequency and greater wave length

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Filed Under: Physics

Q:

A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be

A) a parabola	B) a circle
C) a horizontal straight line	D) a vertical straight line

Answer & Explanation Answer: A) a parabola

Explanation:

Parabola, because when the coin is dropped at a particular point, it has the same velocity as the running train. So by Newton's first law, it continues its motion horizontally with that velocity. But then, it is also pulled down by earth's gravity continuously. In this situation its horizontal motion gives way to the parabolic motion until it reaches the ground.

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Filed Under: Physics

Q:

which city has the Metro with Most stations?

Answer

New York City Subway has 468 stations (277 of which are under ground) in a network covering 370 km (230 miles)

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Subject: General Awareness

Q:

Estate Duty was introducded in ________

Answer

Estate Duty which was introduced in 1953, was withdrawn from March 1, 1985.

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Subject: General Awareness

Q:

The world's Largest Shopping Centre is __________

Answer

The Dubai Mall, located in downtown Dubai, UAE, consists of four levels with a floor area of 548,127 $m^{2}$ (5.9 million $ft^{2}$ ) and has 1,200 retail outlets and over 160 food and beverage outlets. Construction began in 2004, with the mall opening its doors on 4 November 2008.