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 Physics Questions

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Q:

Conservation of energy refers to the fact that

A) if you conserve energy you will not be as tired B) energy cannot be created or destroyed but can be converted from one form to another
C) no chemical reaction is 100 percent efficient D) the entropy of the universe is always increasing
 
Answer & Explanation Answer: B) energy cannot be created or destroyed but can be converted from one form to another

Explanation:

"Conservation of energy" refers to the fact that energy cannot be created or destroyed but can be converted from one form to another.

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Q:

An integrated circuit is more advantages than a coventional circuit because 

A) they make the electric equipments more reliable and easier for servicing B) a faulty part of a conventional circuit may be difficult to locate and repair
C) if a part of the integrated circuit fails the entire circuit is simply replaced D) all the above
 
Answer & Explanation Answer: D) all the above

Explanation:

Integrated circuit (IC) is a tiny device that controls electric signals in such electronic equipments as computers and T.V sets. Many integrated circuits contain thousands of electronic parts on a paper - thin chip of silicon. These parts include capacitors, diodes, all in a very small, compact space.

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Q:

Contact force is another name for _________.

A) Friction B) Magnetic force
C) Electrostatic force D) Muscular force
 
Answer & Explanation Answer: D) Muscular force

Explanation:
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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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Q:

The primary agent of contact metamorphism is

A) Temperature B) Pressure
C) Weathering D) Flowing water
 
Answer & Explanation Answer: A) Temperature

Explanation:

The primary agent of contact metamorphism is heat or temperature.

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Q:

What property of matter is momentum related to?

A) mass B) velocity
C) Both A & B D) None of the above
 
Answer & Explanation Answer: C) Both A & B

Explanation:

At any given speed, momentum is directly proportional to mass of an object.

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5 2925
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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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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