Questions

Q:

Which equation represents a neutralization reaction?

A) 2Al(OH)3(s) ---> Al2O3(s) + 3H2O(l) B) H2SO4(aq) + 2NaOH(aq) ---> Na2SO4(aq) + 2H2O(l)
C) 2H2(g) + O2(g) ---> 2H2O(l) D) H2CO3(aq) ---> CO2(g) + H2O(l)
 
Answer & Explanation Answer: B) H2SO4(aq) + 2NaOH(aq) ---> Na2SO4(aq) + 2H2O(l)

Explanation:

Here in the option B) H2SO4 - Sulfuric acid is reacting with sodium hydroxide (NaOH), a base to produce a salt (Sodium Sulfate), and water (H2O). This is characteristic of of acid-base neutralization reactions.

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Q:

Nucleotides are made of a pentose only.

A) TRUE B) FALSE
Answer & Explanation Answer: B) FALSE

Explanation:

DNA is made of nucleotides. And these Nucleotides are made of a pentose sugar deoxyribose, a phosphate, and a nitrogen-containing bases.


 


Hence, the given statement 'Nucleotides are made of a pentose only' is FALSE.

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Q:

Where do arteries carry blood?

A) Heart B) Lungs
C) Tissues D) Brain
 
Answer & Explanation Answer: A) Heart

Explanation:

Arteries carry oxygenated blood away from the heart to the tissues, except for pulmonary arteries, which carry blood to the lungs for oxygenation (usually veins carry deoxygenated blood to the heart but the pulmonary veins carry oxygenated blood as well).

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Q:

Minutes Hand Clock Puzzle?

A) 12 B) 24
C) 44 D) 60
 
Answer & Explanation Answer: B) 24

Explanation:

Exactly 24 times.

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Q:

Four words are given, out of which only one word is spelt correctly. Choose the correctly spelt word and click the button corresponding to it.

A) Conniosseur B) Connoisseur
C)  Connossieur D) Connosseiur
 
Answer & Explanation Answer: B) Connoisseur

Explanation:
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Q:

The outermost layer of the earth is called

A) Core B) Mantle
C) Crust D) Inner core
 
Answer & Explanation Answer: C) Crust

Explanation:
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Q:

Which statement about general education policy is most accurate?

A) It is set by multiple levels of the government. B) It is determined by local school boards.
C) It is controlled only by the federal government. D) It provides its funding at the state level.
 
Answer & Explanation Answer: A) It is set by multiple levels of the government.

Explanation:

General education policy is set by multiple levels of the government like Federal, state and local governments. 

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Q:

The speed of a boat when travelling downstream is 32 km/h, whereas when travelling upstream it is 28 km/h. What is the speed of the boat in still water?

A) 27 km/h B) 29 km/h
C) 31 km/h D) Cannot be determined
 
Answer & Explanation Answer:

Explanation:

Ans.  Suppose the speed of boat in still water is x km/h and speed of stream is y km/h

Speedof boat in downstream = (x + y) km/h x+ y = 32 …(i) 

Speed of boat in upstream = (x – y) km/h

x – y = 28 …(ii)

Add. Eqs. (i) and (ii), we get 2x = 60

x = 30 km/h

 

 

 

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