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Q:

Black soils are best suited for the cultivation of

A) Maize B) Sugarcane
C) Cotton D) Paddy
 
Answer & Explanation Answer: C) Cotton

Explanation:

Black soils are rich in montmorillonitic and beidellitic group of clay minerals and are poor in nitrogen, phosphorus and organic matter. Black soils are most suitable for the cotton crop hence it is also known as black cotton soil. Besides cotton, the soil is suitable for the cultivation of crops like wheat, groundnut, chillies, tobacco and jowar.

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Filed Under: Indian Geography
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Q:

Choose the correct verb form from those in brackets.

The earth _ round the sun.

A) moves B) moved
C) move D) None of the above
 
Answer & Explanation Answer: A) moves

Explanation:

The earth moves round the sun.

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Filed Under: English
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Q:

Electron, Proton, Neutron discovered by

A) J. J. Thomson, Ernest Rutherford & James Chadwick B) John Dalton, J.J. Thomson & Neils Bohr
C) Neils Bohr, John Dalton & J.J. Thomson D) None of the above
 
Answer & Explanation Answer: A) J. J. Thomson, Ernest Rutherford & James Chadwick

Explanation:

J. J. Thomson discovered electrons in the year 1897.

electron_discovered_by1560577555.jpg image

Ernest Rutherford discovered protons in 1911.

proton_discovered_by1560577702.jpg image

James Chadwick discovered neutrons.

neutron_discovered_by1560577801.jpg image

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Filed Under: General Science
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Q:

Which blood group is called universal donor?

A) AB- B) O-
C) AB+ D) O+
 
Answer & Explanation Answer: B) O-

Explanation:

O- blood group is called universal donor. AB+ is called as universal acceptor.

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Filed Under: Biology
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Q:

Atom bomb discovered by

A) J. Robert Oppenheimer B) Lyndon B. Johnson
C) Felix Adler D) All of the above
 
Answer & Explanation Answer: A) J. Robert Oppenheimer

Explanation:

Julius Robert Oppenheimer was an American theoretical physicist and professor of physics at the University of California, Berkeley. Oppenheimer was the wartime head of the Los Alamos Laboratory and is among those who are credited with being the "father of the atomic bomb" for their role in the Manhattan Project, the World War II undertaking that developed the first nuclear weapons. The first atomic bomb was successfully detonated on July 16, 1945, in the Trinity test in New Mexico.

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Filed Under: General Science
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Q:

Solve this math logical puzzle

how_many_total_digits1560511557.jpg image

A) 192 B) 180
C) 196 D) 189
 
Answer & Explanation Answer: A) 192

Explanation:

Pages are denoted as 

1 - 9 = 09

10 - 99 = 90*2 = 180

100 = 03

 

Hence, total number of digits = 09 + 180 + 03 = 192.

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Filed Under: Math Puzzles
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Q:

Dry distillation of calcium formate gives

A) HCOOH B) CH3COOH
C) HCHO D) CH3CHO
 
Answer & Explanation Answer: C) HCHO

Explanation:

Dry distillation of calcium acetate and calcium formate leads to the formation of aldehydes and ketones.

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Filed Under: Chemistry
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Q:

Which of these rules are applicable for naming covalent compounds?

A) nonmetal name + nonmetal name + suffix –ide B) nonmetal name + nonmetal name + suffix –ite
C) metal name + nonmetal name + suffix –ide D) metal name + nonmetal name + suffix –ite
 
Answer & Explanation Answer: C) metal name + nonmetal name + suffix –ide

Explanation:

Simple covalent compounds are generally named by using prefixes metal name + nonmetal name + suffix –ide to indicate how many atoms of each element are shown in the formula. Also, the ending of the last (most negative) element is changed to -ide. The prefixes used are mono-, di-, tri-, tetra-, penta-, hexa-, and so forth.

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Filed Under: Chemistry
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