Physics Questions

Q:

The ability to do work is called Energy.

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

Yes, the ability to do work is called Energy is True.

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Q:

Q = mcdT refers to

A) Enthalpy formula B) Heat Transfer formula
C) Specific Heat formula D) Heat of Vaporization
 
Answer & Explanation Answer: C) Specific Heat formula

Explanation:

Q = mc∆T refers to Specific Heat formula.

 

When heat energy is added to a substance, the temperature will change by a certain amount.

The relationship between heat energy and temperature is different for every material, and the specific heat is a value that describes how they relate.

 

Q = mc∆T

 

Q = heat energy (Joules, J)

m = mass of a substance (kg)

c = specific heat (units J/kg∙K)

∆T = change in temperature (Kelvins, K)

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Q:

Max well is the unit of

A) intensity of magnetization B) permeability
C) magnetic flux D) magnetic susceptibility
 
Answer & Explanation Answer: C) magnetic flux

Explanation:
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Q:

In case of uniform circular motion, the acceleration is

A) Variable in magnitude but constant in direction B) Constant in magnitude and directed radially inwards
C) Variable in magnitude but tangential to the circle D) Zero
 
Answer & Explanation Answer: A) Variable in magnitude but constant in direction

Explanation:
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Q:

The electrical domestic tube light gives white fluorescent light because of

A) colision between molecules of filled gas under electric current B) heavy current
C) vacuum inside the tube D) falling of ultra violet rays on the white inner coating of the tube
 
Answer & Explanation Answer: D) falling of ultra violet rays on the white inner coating of the tube

Explanation:

The ultraviolet rays have high frequency and shorter wavelength are converted to visible white light with lower frequency and greater wave length

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Q:

A machine powered by rotating blades is a

A) Fumerole B) Turbines
C) Solar panel D) None of the above
 
Answer & Explanation Answer: B) Turbines

Explanation:

Turbines are machines powered by rotating blades.

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Q:

Electrical burns occur principally because of

A) Radiation pulses of the electricity B) The heat generated by the flow of electrical current through the body
C) The high energy of electrons D) All of the above
 
Answer & Explanation Answer: B) The heat generated by the flow of electrical current through the body

Explanation:

Electrical burns occur principally because of the heat generated by the flow of electrical current through the body.

 

Burns caused by electricity are divided into three types:

electrical burns,

arc burns, and

thermal contact burns.

 

Electrical burns can result when a person touches electrical wiring or equipment that is used or maintained improperly.

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Q:

Which best describes how air moves during convection?

A) cool air falls down B) warm air falls down
C) cool air is replaced by warm air D) air always falls down
 
Answer & Explanation Answer: A) cool air falls down

Explanation:

During convection, cool and dense air falls through the warmer and less dense air. The warm air having less mass is being displaced by the cooler which is much heavy. Convection always involves the air rising through the atmosphere.

 

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