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 Physics Questions

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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 1878
Q:

A projectile launched at____ degree angle has the greatest range?

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Subject: Physics

3 1876
Q:

The amount of water vapor in the air is

A) Hot air B) Humidity
C) Dew D) Foam
 
Answer & Explanation Answer: B) Humidity

Explanation:

The amount of water vapor ranges from a trace amount up to 4% of the mass of air. Water vapor exists as an invisible gas in the air.

 

The amount of water vapor in the air is called absolute humidity. The amount of water vapor in the air as compared with the amount of water that the air could hold is called relative humidity.

The maximum amount of water vapor that can be in the air depends on the air temperature.

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4 1871
Q:

What is the heat generated (in J) in a heating element of resistance 900 Ω when a current of 0.3 A passes through it for 10 seconds?

A) 2700 B) 810
C) 405 D) 1350
 
Answer & Explanation Answer: B) 810

Explanation:
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1 1868
Q:

three_resistors_are_arranged_in_a_circuit_as_shown_above1559105724.PNG image

Three resistors are arranged in a circuit as shown above. The battery has an unknown but constant emf ε and a negligible internal resistance.

Now, determine the equivalent resistance of the three resistors.

A) 12 Ω B) 10 Ω
C) 16 Ω D) 15 Ω
 
Answer & Explanation Answer: A) 12 Ω

Explanation:

From the given circuit,

three_resistors_are_arranged_in_a_circuit_as_shown_above1559105964.PNG image

The resistors R1 and R2 are in parallel connection and R3 is in series with R1 & R2

The equivalent resistance of R1 and R2 is

Req = (12 × 4)/(12 + 4) = 3 Ω.

Adding R3 in series with the pair gives

R = Req + 9

R = 3 + 9

R = 12 Ω.

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2 1865
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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2 1863
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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0 1859
Q:

In human relations, the irritation threshold is the

A) length of time an annoying behavior continues B) action that causes an annoyance
C) frequency of the annoying behavior D) point at which a person notices something and becomes annoyed
 
Answer & Explanation Answer: D) point at which a person notices something and becomes annoyed

Explanation:
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1 1849