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 Physics Questions

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Q:

The strength of a force is usually expressed by its __________.

A) Motion B) Direction
C) Interaction D) Magnitude
 
Answer & Explanation Answer: D) Magnitude

Explanation:
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Q:

Electrical Arcing occurs when

Answer

An electric arc is a visible plasma discharge between two electrodes that is caused by electrical current ionizing gasses in the air. Electric arcs occur in nature in the form of lightning.

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Q:

The unit for measuring electric power is the

A) Steridian B) Watts
C) Watts D) Volts
 
Answer & Explanation Answer: C) Watts

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Q:

An image formed by a plane mirror, that cannot be obtained on a screen is called _______.

A) Virtual image B) Real image
C) Inverted image D) Erect image
 
Answer & Explanation Answer: A) Virtual image

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Q:

Which of the following never occurs singly in nature?

A) Inertia B) Momentum
C) Force D) Velocity
 
Answer & Explanation Answer: C) Force

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Q:

Upward force on a floating body is called _______.

A) jerk B) buoyancy
C) Archimedal force D) Anti-gravity
 
Answer & Explanation Answer: B) buoyancy

Explanation:
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Q:

What type of heat transfer is boiling water?

A) radiation B) conduction
C) convection D) None of the above
 
Answer & Explanation Answer: C) convection

Explanation:

Convection is by far the most efficient and common way for heat to be transferred through liquids and gases. It occurs when some regions of a fluid get hotter than others, causing currents in the fluid that move it around to distribute that heat more evenly.

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Q:

Which type of radiation has the lowest penetrating ability?

A) Alpha B) Beta
C) Gamma D) All of the above
 
Answer & Explanation Answer: A) Alpha

Explanation:

In order of increasing penetration power, alpha particles have the lowest, then beta particles, then gamma rays.

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