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Q:

Warm air is ______.

A) heavier than cold air hence warm air rises up B) lighter than cold air hence warm air moves down
C) lighter than cold air hence warm air rises up D) heavier than cold air hence warm air moves down
 
Answer & Explanation Answer: C) lighter than cold air hence warm air rises up

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Q:

Which of the following device is used to measure humidity?

A) Hydrometer B) Hygrometer
C) Psycho Meter D) Anemometer
 
Answer & Explanation Answer: B) Hygrometer

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Q:

Sound can not travel in which of the following medium?

A) Solid B) Liquid
C) Gas D) Vacuum
 
Answer & Explanation Answer: D) Vacuum

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Q:

Through which does light travel best?

A) water B) air
C) vacuum D) none
 
Answer & Explanation Answer: C) vacuum

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Q:

A lemon kept in water in a glass tumbler appears to be bigger than its actual size when viewed from the sides. This is because of

A) reflection of light B) internal reflection of light
C) refraction of light D) diffraction of light
 
Answer & Explanation Answer: C) refraction of light

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Q:

Optical fibre works on which of the following principle of light?

A) Reflection B) Refraction
C) Diffraction D) Total internal reflection
 
Answer & Explanation Answer: D) Total internal reflection

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Q:

What is the unit of the physical quantity "Capacitance"?

A) weber B) farad
C) tesla D) ohm
 
Answer & Explanation Answer: B) farad

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Q:

What is the unit of calorific value?

A) kN/kg B) kJ/kg
C) kW/sec D) kCal/sec
 
Answer & Explanation Answer: B) kJ/kg

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