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Q:

Consider the electromagnetic radiations having wavelengths 200 nm, 500 nm and 1000 nm. Which wavelength (s) of the following can make visual sensation to a human eye?

A) 200 nm and 500 nm B) 500 nm and 1000 nm
C) 500 nm only D) 200 nm and 1000 nm
 
Answer & Explanation Answer: C) 500 nm only

Explanation:
Visual image of human eye is 390-700 nanometer. So, approximate value is 500 nanometer only.
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Filed Under: Physics
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Q:

Which is the best definition of activation energy?

A) the energy required to break the bonds of reactant molecules B) the energy required to end a chemical reaction
C) the energy required to bind a substrate to an active site D) the energy required to re-form bonds in product molecules
 
Answer & Explanation Answer: A) the energy required to break the bonds of reactant molecules

Explanation:

Activation energy is a minimum amount of energy that required for the chemical reaction to happen or to take place.

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Filed Under: Chemistry
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Q:

Which best describes somatic mutations?

A) transmitted to progeny B) not transmitted to progeny
C) Can't be identified D) None of the above
 
Answer & Explanation Answer: A) transmitted to progeny

Explanation:

The best example for somatic mutation would be cancer, familial cancer (which transmits through gametes to the next generation) are not so common while sporadic cancer is seen the most where body cells of a particular area goes through mutations for a number of years and becomes cancerous, but it is not transmitted to next generation.

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Filed Under: Biology
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Q:

The law of conservation of energy states that

A) energy can neither be created nor destroyed B) energy can either be created nor destroyed
C) energy can neither be created or destroyed D) energy can either be created or destroyed
 
Answer & Explanation Answer: A) energy can neither be created nor destroyed

Explanation:

The law of conservation of energy is a law of science which states that energy can neither be created nor destroyed - only converted from one form of energy to another.

In 1842, Julius Robert Mayer discovered the Law of Conservation of Energy.

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Q:

Rockr, a cell phone from Motorola that uses Apple's iTunes software and stores up to 100 songs in its Flash memory, has been launched by 

A) Nokia B) Samsung
C) Motorola D) Bird
 
Answer & Explanation Answer: C) Motorola

Explanation:
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Filed Under: Business Awareness

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Q:

In 1994,the African National Congress won the elections in South Africa under the leadership of

Answer

Nelson Mandela

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Subject: World History

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Q:

The mass defect is the result of what action occurring?

A) mass being converted to energy when protons and neutrons bind together in a nucleus B) protons and electrons being attracted to each other
C) energy being converted into moles of atoms when neutrons break apart protons D) mass being converted to energy when protons and neutrons break apart in a nucleus
 
Answer & Explanation Answer: A) mass being converted to energy when protons and neutrons bind together in a nucleus

Explanation:
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Filed Under: Physics
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Q:

Which of these is a starting point for primary succession?

A) a neglected yard B) a surface exposed by a retreating glacier
C) an abandoned city D) abandoned farmland
 
Answer & Explanation Answer: B) a surface exposed by a retreating glacier

Explanation:
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Filed Under: General Science
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