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Q:

Lime water turns milky when carbon dioxide is passed through it. It is due to the formation of

A) Calcium Carbonate B) Barium Carbonate
C) Calcium Hydrogen Carbonate D) Calcium Oxide
 
Answer & Explanation Answer: A) Calcium Carbonate

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0 2018
Q:

Hydrogenation process is associated with which of the following?

A) Rubber B) Petroleum
C) Copper D) Edible fats
 
Answer & Explanation Answer: D) Edible fats

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2 2010
Q:

Elements that are poor conductors of heat and electricity are

A) Metals B) Non metals
C) Halogens D) Noble
 
Answer & Explanation Answer: B) Non metals

Explanation:

Elements that are poor conductors of heat and electricity are called Non metals.

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3 2006
Q:

The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its ___________.

A) Crystallisation B) Melting point
C) Evaporation D) Galvanisation
 
Answer & Explanation Answer: B) Melting point

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0 2006
Q:

The salt concentration (measured as salinity in parts per thousand), is greater than _______ % in hypersaline lagoons.

A) 50 B) 100
C) 150 D) 200
 
Answer & Explanation Answer: B) 100

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1 2005
Q:

Which metal is responsible for Itai-Itai disease?

A) Cadmium B) Nickel
C) Chromium D) Mercury
 
Answer & Explanation Answer: A) Cadmium

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0 2004
Q:

Which one of the following is the correct relation between the Kelvin temperature (T) and the Celsius temperature (fc)?

A) These are two independent temperature scales B) T = tc
C) T = tc - 273.15  D) T = tc + 273.15 
 
Answer & Explanation Answer: D) T = tc + 273.15 

Explanation:

Lord Kelvin, working in Scotland, developed the Kelvin scale in 1848. His scale uses molecular energy to define the extremes of hot and cold. Absolute zero, or 0 K, corresponds to the point at which molecular energy is at a minimum. The Kelvin scale is preferred in scientific work, although the Celsius scale is also commonly used. Temperatures measured on the Kelvin scale are reported simply as K, not °K.

T (in °C) + 273.15 = T (in K)

T (in K) − 273.15 = T (in °C)

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0 2004
Q:

In which of the following MgCl2 is soluble?

A) Petrol B) Acetone
C) Kerosene D) Water
 
Answer & Explanation Answer: D) Water

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2 2002