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Q:

Water is a compound because it?

A) it contains two different elements joined by chemical bond B) it contains hydrogen & oxygen
C) it exists as solid, liquid or gas D) it cannot be split up into simpler substances by chemicals means
 
Answer & Explanation Answer: A) it contains two different elements joined by chemical bond

Explanation:

We know that All compounds are molecules, but not all molecules are compounds.

Water is a molecule because it is made from atoms that have been chemically combined. It is also a compound because the atoms that make water are not all the same - some are oxygen and some are hydrogen.

 

Hence, Water is a molecule and a compound.

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Filed Under: General Science
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Q:

The fastest growing plant is ______ ?

A) Ashoka B) Banyan
C) Eucalyptus D) Rose
 
Answer & Explanation Answer: C) Eucalyptus

Explanation:
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Q:

Gammaxene, D.D.T. & Bleaching powder are important compounds of

A) Nitrogen B) Phosphorus
C) Chlorine D) Sulphur
 
Answer & Explanation Answer: C) Chlorine

Explanation:

Gammaxene, D.D.T. & Bleaching powder are important compounds of Chlorine.

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Filed Under: Chemistry
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5 7153
Q:

Which value is equal to 5% of 1,500?

A) 35 B) 55
C) 75 D) 45
 
Answer & Explanation Answer: C) 75

Explanation:

In the question it is asked for 5% of 1500

5 x 1500/100 = 15 x 5 = 75.

 

Hence, 5% of 1,500 is equal to 75.

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Filed Under: Percentage
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10 7153
Q:

Who is the father of Tissue Culture ?

A) Gautheret B) Haberlandt
C) Bonner D) Laibach
 
Answer & Explanation Answer: B) Haberlandt

Explanation:
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Q:

Which best describes transformation in bacteria?

A) Bacteria take DNA from their environment. B) Bacteria inject DNA into another cell.
C) Bacteria lie dormant for many weeks. D) Bacteria transfer DNA with a bacteriophage.
 
Answer & Explanation Answer: A) Bacteria take DNA from their environment.

Explanation:

"Bacteria take DNA from their environment" is what best describes transformation in bacteria.

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Filed Under: Biology
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4 7145
Q:

A take twice as much time as B or thrice as much time to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in  ?

A) 8 hrs B) 12 hrs
C) 6 hrs D) 4 hrs
 
Answer & Explanation Answer: C) 6 hrs

Explanation:

Suppose A, B and C take x, x/2 and x/3 respectively to finish the work. 

Then, (1/x + 2/x + 3/x) = 1/2 

=> 6/x = 1/2      => x = 12 

So, B takes 6 hours to finish the work.

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Filed Under: Time and Work
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Q:

Wireless transmission can be done via

A) Infrared waves B) Radio waves
C) Microwaves D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Wireless transmission can be done via any of the Infrared waves, Radio waves or Microwaves.

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Filed Under: General Science
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