Tag: physics

Questions Related to physics

$1$ kg = __________ pounds

physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

  1. 5.121

  2. 1.856

  3. 2.203

  4. 0.547

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Correct Option: C
Explanation:

one kg is equal to $2.203$ pounds

$\Rightarrow 1$ kg  $=2.203$ pounds
Therefore option $C$ is correct

Which of the following is a NOT non-metric unit of mass ?

physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

  1. tons

  2. pounds

  3. ounces

  4. kilograms

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Correct Option: D
Explanation:
Pounds,tons and ounces are non metric unit of mass
The basic metric unit of mass is kilogram
So kilogram is not non metric unit of mass
Therefore option $D$ is correct

One astronomical unit is the mean distance between the centre of the Earth and centre

of the_________ .

physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

  1. Mars

  2. Moon

  3. Sun

  4. Jupiter

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Correct Option: C
Explanation:
One astronomical unit (AU) is defined as the mean distance between the centre of the Earth and the centre of The Sun.
$ \ AU = 1.5\times 10^{11} \ m$

One light year is used for measurement of large distances?

physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

  1. True

  2. False

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Correct Option: A
Explanation:
One light year is defined as the distance travelled by light in one year in vacuum.
$1 \ light  \ year = 9.5\times 10^{15} \ m$
Since, one light year is very large value. Thus one light year is used for measurement of large distance.

Parallax method is used to measure small distances between molecules?

physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

  1. True

  2. False

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Correct Option: B
Explanation:
Parallax method is used to measure very large distance, probably the diameter of the sun, moon and other planets etc.
Thus the given statement is false.

1 light year $=$ ....................... m.

physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

  1. $ 9.46 \times 10^{12}$

  2. $ 9.46 \times 10^{15}$

  3. $ 9.46 \times 10^{10}$

  4. $ 9.46 \times 10^{18}$

Show answer
Correct Option: B
Explanation:

One light year is defined as the distance travelled by light in vacuum in one year.


Speed of light in vacuum  $v = 3\times 10^{8} \ m/s$

Time in one year   $1 \ year = 365\times 24\times 60\times 60 \ s$

Thus, one light year $ = vt = 9.46\times 10^{15} \ m$

Tonne is:

physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

  1. a metric system defined unit

  2. a SI system defined unit

  3. a non-metric system defined unit

  4. None of the above

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Correct Option: C
Explanation:

Tonne is a non-metric system defined unit of mass.
$1 \ tonne = 1000 \ kg$

The maximum distance that a light signal could have travelled since the birth of universe is called.

physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

  1. Horizon distance

  2. Linear distance

  3. World line

  4. Hawking distance

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Correct Option: A

State whether the following statement is True or False. 

Light year is a unit of time.

physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

  1. True

  2. False

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Correct Option: B
Explanation:

Light year is a unit of length and is defined as the distance travelled by light in one year.

Express parsec in terms of metres. 

physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

  1. $3.1\times { 10 }^{ 16 }m$

  2. $3\times { 10 }^{ 8 }m$

  3. $3.1\times { 10 }^{ 18 }m$

  4. $3.1\times { 10 }^{ 32 }m$

Show answer
Correct Option: A