Physics Questions

Q:

A car parked in the sun with its windows closed gets terribly hot inside. This is due to 

A) the heat emitted by the engine B) the greenhouse effect
C) the good conducting power of the metal body D) the double layered wind shield
 
Answer & Explanation Answer: B) the greenhouse effect

Explanation:

The green house effect. The waves of smaller wavelength from the sun enter inside the car through the glass windows and are absorbed. The waves of larger wavelength emitted from inside cannot get out through the glass, but remain inside and make it terribly hot.

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Q:

Which of the following definitions describes a physical hazard?

A) The most commonly thought of hazard in construction. This hazard includes radiation, extreme temperatures, noise, and vibration. B) These hazards can lead to injuries to the joints or muscles by way of heavy, frequent lifting, repetitive tasks.
C) Can be present in dust, fumes, liquids, solids, mists, vapors, or gases of products used at a site or released during a construction job D) Microorganisms, such as bacteria, fungus, mold, or viruses that can cause illness.
 
Answer & Explanation Answer: A) The most commonly thought of hazard in construction. This hazard includes radiation, extreme temperatures, noise, and vibration.

Explanation:

A physical hazard is defined as "A factor within the environment that can harm the body without necessarily touching it."

Vibration and noise are examples of physical hazards.

 

Physical hazards include but aren't limited to electricity, radiation, pressure, noise, heights and vibration amongst many others.

 

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Q:

Cryogenic Engines find applications in

A) Frost - Free refrigerators B) Sub-marine propulsion
C) Researches in superconductivity D) Rocket technology
 
Answer & Explanation Answer: D) Rocket technology

Explanation:

Cryogenic Engines find applications in Rocket technology. A cryogenic rocket engine is a rocket engine that uses a cryogenic fuel or oxidizer, that is, its fuel or oxidizer are gases liquefied and stored at very low temperatures. Notably, these engines were one of the main factors of NASA's success in reaching the Moon by the Saturn V rocket.

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2 6005
Q:

Which results in an increase in power?

A) doing more work in less time. B) doing less work in more time.
C) doing less work in less time. D) doing more work in more time.
 
Answer & Explanation Answer: A) doing more work in less time.

Explanation:

Doing more work in less time, results in an increase in power to do a work.

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Q:

Unresolved dissonance is a characteristic of

Answer

When the tension is unresolved, we have unresolved dissonance. Unresolved dissonance is a characteristic of the baroque music.


The general characteristics of Baroque music is movement, energy, and tension.

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Q:

Number of basic SI unit is

A) 4 B) 7
C) 6 D) 5
 
Answer & Explanation Answer: B) 7

Explanation:
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Q:

An atom bomb based upon the principal of ________

A) Nuclear fission B) Nuclear fussion
C) Controlled chain reaction D) None of these
 
Answer & Explanation Answer: A) Nuclear fission

Explanation:
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Q:

The formation of frost on cooling coils in a refrigerator

A) Increases heat transfer B) Improves C.O.P. of the system
C) Increases power consumption D) Reduces power consumption
 
Answer & Explanation Answer: C) Increases power consumption

Explanation:

The formation of frost on cooling coils in a refrigerator Increases power consumption.

The_formation_of_frost_on_cooling_coils_in_a_refrigerator1593770992.jpg image

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