Questions

Q:

Is rusting a physical or chemical change?

Answer

In chemistry rusting is called as oxidation. Oxidation is a chemical process where metal gains oxygen and become oxide. In rusting the Iron ore make a chemical reaction with the oxygen in the presence of water and environmental or atmospheric moisture to produce an Iron oxide. Iron oxide is otherwise called as rust.


The rusting of iron is a chemical change because it is two substances reacting together to make a new substance. 


 


Rusting would only be a physical change if iron molecules remained pure iron throughout the process.

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Q:

Find the compound amount if $2900 is deposited at 5% interest for 10 years if interest is compounded daily

A) 4781.13 B) 5781
C) 3456 D) 4567
 
Answer & Explanation Answer: A) 4781.13

Explanation:

M=P(1+i/365)^365n

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Q:

Which among the following minerals is also known as Horn Silver?

A) Silver Chroride B) Zinc Phosphate
C) Silver Iodide D) Silver Sulphide
 
Answer & Explanation Answer: A) Silver Chroride

Explanation:

Silver chloride is a chemical compound with the chemical formula AgCl is also called as Horn Silver. It is also called as cerargyrite. It is a gray, very heavy halide mineral and an ore of silver.

Which_among_the_following_minerals_is_also_known_as_Horn_Silver1560942904.jpg image

 

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Q:

Which statement is one component of the cell theory?

A) DNA is the basis of genetic transfer B) All living cells arise from pre-existing cells
C) All cells are composed of same organelles D) Tissues are formed from combinations of cells
 
Answer & Explanation Answer: B) All living cells arise from pre-existing cells

Explanation:

All living cells arise from pre-existing cells is one component of the cell theory.

 

The Cell Theory is one of the basic principles of biology.

 

The Cell Theory states:

1. All living organisms are composed of cells. They may be unicellular or multicellular.

2. The cell is the basic unit of life.

3. Cells arise from pre-existing cells.

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Q:

How many Indian sites have been mentioned in the report ‘Not For Sale’ by the World Wide Fund for Nature ?

A) 5 B) 7
C) 6 D) 8
 
Answer & Explanation Answer: B) 7

Explanation:

The sites in India named include Nanda Devi and Valley of Flowers National Park, Kaziranga National Park, Manas Wildlife Sanctuary, Keoladeo National Park, Western Ghats, Great Himalayan National Park Conservation Area and Khangchendzonga National Park.

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Q:

In which of the following branches of Knowledge outstandin contribution for the benefits of mankind is not recognised with a Nobel Prize

A) Madicine B) Chemistry
C) Engineering D) Economics
 
Answer & Explanation Answer: C) Engineering

Explanation:
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Q:

Which city is hosting 2020 summer Olymic games?

A) Athens B) Tokyo
C) Pyeongchang D) Beijing
 
Answer & Explanation Answer: B) Tokyo

Explanation:

2020 summer Olymic games to be held in Tokyo, Japan.

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Q:

The gap between two communicating neurons is termed

A) Schwann cell B) Effector
C) Synaptic cleft D) Cell body
 
Answer & Explanation Answer: C) Synaptic cleft

Explanation:

A neuron or nerve cell is a cell that carries electrical impulses. Neurons are the basic units of the nervous system and its most important part is the brain. Every neuron is made of a cell body (also called a soma), dendrites and an axon. Dendrites and axons are nerve fibres.

 

The gap between two communicating neurons is termed Synaptic cleft.

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