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Q:

The coil wire in the electric room heater or electric cooking heater is called __________.

A) Circuit B) Element
C) Filament D) Cells
 
Answer & Explanation Answer: B) Element

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1 1096
Q:

In total internal reflection, the light travel from

A) rarer to denser medium and it occurs with no loss of intensity B) denser to rarer medium and it occurs with no loss of intensity
C) rarer to denser medium and it occurs with loss of intensity D) denser to rarer medium and it occurs with loss of intensity
 
Answer & Explanation Answer: B) denser to rarer medium and it occurs with no loss of intensity

Explanation:

According to wave theories, for Total internal reflection tohappen: Light must travel from denser medium to rarer medium. Angle of incidence should be greater than critical angle. As in case of TIR, the image is perfectly clear, it implies that there has been no loss of intensity.

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1 1094
Q:

One nanometer is equal to _____________ meters.

A) 10 raised to the power (­3) B) 10 raised to the power (­-6)
C) 10 raised to the power (­-9) D) 10 raised to the power (­-12)
 
Answer & Explanation Answer: C) 10 raised to the power (­-9)

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0 1092
Q:

Which of the following is not a vector quantity?

A) Work B) Force
C) Displacement D) Velocity
 
Answer & Explanation Answer: A) Work

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0 1090
Q:

According to the Second Law of Motion, for a given force, acceleration is inversely proportional to the ____ of an object.

A) density B) volume
C) force D) mass
 
Answer & Explanation Answer: D) mass

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0 1089
Q:

_________________ through a plane surface is the product of the magnetic flux density normal to the surface and the area of the surface.

A) Magnetic susceptibility B) Magnetic resonance
C) Magnetic flux D) Magnetic pulse
 
Answer & Explanation Answer: C) Magnetic flux

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2 1088
Q:

Choose the most appropriate answer:Natural radioactivity was discovered by

A) Marie Curie B) Earnest Rutherford
C) Henry Bacquerel D) Enrico Fermi
 
Answer & Explanation Answer: C) Henry Bacquerel

Explanation:

Natural radioactivity was discovered by Henri Bacquerel.

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2 1087
Q:

At boiling point of liquids , its

A) Temperature increases B) Atmospheric pressure increases
C) Temperature remains constant D) Vapour pressure decreases
 
Answer & Explanation Answer: C) Temperature remains constant

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0 1083