999+ Physics Questions Answers Explanation MCQ

Q:

The Capacity of a Communication Channel is Measured in

A) Band rate	B) Band width
C) Data flow	D) Bit capacity

Answer & Explanation Answer: B) Band width

Explanation:

The path that data takes from source to destination is called a Channel. A channel is a communication medium. A channel has a certain capacity for transmitting information.

The "capacity" of a channel is the theoretical upper-limit to the bit rate over a given channel that will result in negligible errors. Channel capacity is often measured by its Bandwidth in Hz or its data rate in bits per second.

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15 10935

Q:

The instrument that measures the wind speed is called __________________.

A) an anemometer	B) an odometer
C) a manomete	D) a barometer

Answer & Explanation Answer: A) an anemometer

Explanation:

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Q:

Light from the sun reaches us in nearly

A) 5 min	B) 4.30 hrs
C) 8 min	D) 5.30 hrs

Answer & Explanation Answer: C) 8 min

Explanation:

The light from the sun takes about 8 minutes to reach the Earth after it has been emitted from the sun's surface.

The time it takes for light to reach planets in our Solar System varies from about 3 minutes for Mercury to about 5.3 hours for Pluto.

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Q:

Match the following with the correct response.

(1) W	(A) Nm
(2) kW	(B) $3.6 x 10^{6} J$
(3) 1 kW-h	(C) 1000 W
(4) 1 HP	(D) 746 W

A) 1-D, 2-B, 3-C, 4-A	B) 1-A, 2-B, 3-C, 4-D
C) 1-A, 2-C, 3-D, 4-B	D) 1-A, 2-C, 3-B, 4-D

Answer & Explanation Answer: D) 1-A, 2-C, 3-B, 4-D

Explanation:

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Q:

The image of an object formed on the retina of the eye is

A) virtual and upright	B) virtual and inverted
C) real and inverted	D) Real and upright

Answer & Explanation Answer: C) real and inverted

Explanation:

Although the image is inverted the mental interpretation of the effect on the retina is as though it is erect

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Q:

Energy is continuously generated in the sun due to

A) Nuclear fusion	B) Nuclear fission
C) Radioactivity	D) Artificial radioactivity

Answer & Explanation Answer: A) Nuclear fusion

Explanation:

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Q:

The information of brilliant colors in a thin soap film is a consequence of the phenomena of

A) Polarization and interference	B) Diffraction and dispersion
C) Multiple refraction and dispersion	D) Multiple reflection and interference

Answer & Explanation Answer: D) Multiple reflection and interference

Explanation:

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Q:

The rotational effect of a force on a body about an axis of rotation is described in terms of

A) Centre of gravity	B) Centripetal force
C) Centrifugal force	D) Moment of force

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