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 Physics Questions

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Q:

What is the unit of the physical quantity, Momentum?

A) newton second B) joule second
C) erg second D) pascal second
 
Answer & Explanation Answer: A) newton second

Explanation:
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Q:

Persistence of vision is the principle behind

A) Telescope B) Periscope
C) Cinema D) Microscope
 
Answer & Explanation Answer: C) Cinema

Explanation:

Optical illusion is what that refers to persistence of vision with a principle that multiple images blend into a single image in human mind and what is showed in cinema.

 

Hence, Persistence of vision is the principle behind cinema.

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Q:

Lux is the SI unit of

A) luminous flux B) luminous efficiency
C) intensity of illumination D) luminous intensity
 
Answer & Explanation Answer: C) intensity of illumination

Explanation:

The lux (lx) is the SI derived unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square meter.

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Q:

"Light years" is the unit of _____?

A) Acceleration B) Distance
C) Light Intensity D) Weight
 
Answer & Explanation Answer: B) Distance

Explanation:

A Light-year is a distance that light travels in the vacuum in one Julian year (365.25 days).

The light-year is a unit of length used to express astronomical distances. It is about 9.5 trillion kilometers or 5.9 trillion miles. 

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Q:

A bimetal made copper and iron strips welded together is straight at room temperature. It is held vertically with iron strip towards left and copper strip towards right. If this bimetal is heated , it will

A) remain straight B) bend towards right
C) bend towards left D) none of these
 
Answer & Explanation Answer: C) bend towards left

Explanation:
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Q:

Which of the following properties is found only in ferromagnetic materials ?

A) Susceptibility independent of temperature B) Point in a particular direction
C) Hysteresis D) Attracting a magnetic substance
 
Answer & Explanation Answer: C) Hysteresis

Explanation:
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Q:

Lens is made up of which glass

A) Ordinary glass B) Pyrex glass
C) Flint glass D) Cobalt glass
 
Answer & Explanation Answer: C) Flint glass

Explanation:
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Q:

What is unit of Astronomical distance ?

A) light year B) angstrom
C) weber D) lux
 
Answer & Explanation Answer: A) light year

Explanation:

angstrom is used to measure wave length,

weber is used to measure Magnetic flux,

lux is used to measure Intensity of illumination.

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