Why does a piece of cloth, which appears green in | Physics Questions & Answers

Q:

What is the noise level of normal conversation?

A) About 60 dB	B) About 70 dB
C) About 80 dB	D) About 90 dB

Answer & Explanation Answer: A) About 60 dB

Explanation:

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Q:

As an object falls freely its ___________________.

A) kinetic energy gets converted into potential energy	B) potential energy gets converted into kinetic energy
C) momentum gets converted into gravitational force	D) gravitational force gets converted into momentum

Answer & Explanation Answer: B) potential energy gets converted into kinetic energy

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Q:

Due to an acceleration of 1 $m / s^{2}$ , the velocity of a body increases from 5 m/s to 10 m/s in a certain period. Find the displacement (in m) of the body in that period.

A) 125	B) 37.5
C) 62.5	D) 75

Answer & Explanation Answer: B) 37.5

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Q:

What is measured with the Nephometer?

A) volume of rainfall	B) Cloud volume and speed
C) Salinity of Sea	D) All options are correct.

Answer & Explanation Answer: B) Cloud volume and speed

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2 21459

Q:

What is the standard room temperature in Kelvin?

A) 98 K	B) 198 K
C) 273 K	D) 373 K

Answer & Explanation Answer: A) 98 K

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Q:

An object, starting from rest, moves with constant acceleration of 4 m/s2. After 8 s, its speed is

A) 16 m/s	B) 8 m/s
C) 32 m/s	D) 4 m/s

Answer & Explanation Answer: C) 32 m/s

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7 951

Q:

1 watt is equal to 1 ____________

A) J s-1	B) J s
C) J s-2	D) J

Answer & Explanation Answer: A) J s-1

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5 23025

Q:

A body is initially moving with a velocity of 10 m/s. It undergoes an acceleration of 2 m/s2 for 5 seconds. Find the displacement (in m) of this body in these 5 seconds.

A) 25	B) 37.5
C) 50	D) 75

A) The cloth completely absorbs red colour wavelength	B) It is due to refraction
C) It is the effect of scattering of light	D) It is due to Parallax error

Why does a piece of cloth, which appears green in sunlight, appear black when it is viewed under red light?

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