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Q:

Heat is associated with

A) K.E of random motion of molecules B) K.E of orderly motion of molecules
C) Total K.E of random and orderly motion of molecules D) None of these
 
Answer & Explanation Answer: A) K.E of random motion of molecules

Explanation:
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Q:

Why does the sea appear blue in colour?

A) Reflection of the sun light from water surface B) Interference of the sun light from water surface
C) Scattering of the sunlight by water molecules D) refraction of the sun light
 
Answer & Explanation Answer: C) Scattering of the sunlight by water molecules

Explanation:

Sea appears blue in colour due to the scattering of the rays when they hit water molecules

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Q:

The safest hammers are those with heads that are

A) cast steel and chiseled B) alloy and drop-forged steel
C) welded and alloyed D) chiseled and drop forged
 
Answer & Explanation Answer: B) alloy and drop-forged steel

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Q:

Radian is used to measure

A) Temperature B) Intensity of Flame
C) Angle D) Solid Angle
 
Answer & Explanation Answer: C) Angle

Explanation:

Kelvin is used to measure Temperature,

Candela is used to measure Intensity of flame,

Steredian is used to measure Solid Angle.

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Q:

Heat energy of an object is

A) the average energy of the molecules of the object B) the total energy of the molecules of the object
C) the average velocity of the molecules of the object D) the average potential energy of the molecules of the object
 
Answer & Explanation Answer: B) the total energy of the molecules of the object

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Q:

The force exerted by a magnet is an example of _________.

A) Non-contact force B) Muscular force
C) Contact force D) Electrostatic force
 
Answer & Explanation Answer: A) Non-contact force

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Q:

Gasoline is useful in cars because it has

A) chemical potential energy B) electrical potential energy
C) gravitational potential energy D) kinetic energy
 
Answer & Explanation Answer: A) chemical potential energy

Explanation:

Gasoline is a colorless petroleum-derived flammable liquid that is used primarily as a fuel in spark-ignited internal combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives. It is also called as Petrol. It has chemical potential energy, in combustion it is turned into light, sound, heat and kinetic energy.

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Q:

SI unit of temperature is

A) Kelvin B) Celsius
C) Fahrenheit D) Joule
 
Answer & Explanation Answer: A) Kelvin

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