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Q:

Metals are good conductors of electricity because

A) The atoms are lightly packed B) They contain free electrons
C) They have high melting point D) All the above
 
Answer & Explanation Answer: B) They contain free electrons

Explanation:

Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points. The free electrons in metals can move through the metal, allowing metals to conduct electricity.

Because the electrons in the atom's higher energy levels can separate from the atoms easily, they can be pulled out with very little energy. Because the molecular structure of the metal is such that 'free electrons' are free to move, thus being categorized as electrically conductive.

 

For example, copper is used for electrical wiring because it is a good conductor of electricity.

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Filed Under: Physics
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Q:

Which of the following is true of a scientific theory?

A) It is only accepted after the person who came up with it has died. B) It is a method or device that applies scientific knowledge for some specific purpose.
C) It generates testable hypotheses, is supported by a large body of evidence, and is broad in scope. D) It must demonstrate the effect of one variable by testing control groups and experimental groups.
 
Answer & Explanation Answer: C) It generates testable hypotheses, is supported by a large body of evidence, and is broad in scope.

Explanation:

A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. Such fact-supported theories are not "guesses" but reliable accounts of the real world. Scientific theories are not ever proved in the sense of being proved to be 100% correct.

 

Examples of some scientific theories are ::

Evolution, gravity, atomic theory, the germ theory of disease, relativity, quantum theory, electromagnetic theory, layered Earth theory, etc...

 

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Filed Under: General Science
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Q:

Cancer is caused by

A) Loss of immunity of cells B) Uncontrolled meiosis
C) Uncontrolled mitosis D) Rupturing of cells
 
Answer & Explanation Answer: C) Uncontrolled mitosis

Explanation:
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Q:

What is "Trend Micro" ?

A) Name of an insect B) It is an electronic machine
C) It is anti-virus software D) None
 
Answer & Explanation Answer: C) It is anti-virus software

Explanation:
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Q:

Select the correct statement (s).

A) When energy is transferred to the system from the surrounding as work, the surrounding do work on the system and the value of work (W) positive. B) When energy is transferred from the system to the surrounding as work, work is done on the surrounding and the value of W is negative.
C) Both (A) and (B) D) None of the above
 
Answer & Explanation Answer: C) Both (A) and (B)

Explanation:
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Filed Under: Chemistry
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Q:

What position did Babe Ruth play

A) Only 1st base B) Both pitcher and out fielder
C) Only out fielder D) Only pitcher
 
Answer & Explanation Answer: B) Both pitcher and out fielder

Explanation:
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Q:

If log330 = 1a  and  log530=1b then the value of 3log302 is:

A) 3(1+a+b) B) 2(1-a-b)
C) 3(1-a-b) D) 3(1+a-b)
 
Answer & Explanation Answer: C) 3(1-a-b)

Explanation:
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Q:

Extensive planting of trees to increase forest cover is called

Extensive_planting_of_trees_to_increase_forest_cover_is_called1552993768.jpg image

A) Agroforestry B) Social forestry
C) Afforestation D) Deforestation
 
Answer & Explanation Answer: C) Afforestation

Explanation:

The process of extensive planting of trees or seeds in barren lands to increase forest cover is called as Afforestation.

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