Tag: measurements and experimentation

Questions Related to measurements and experimentation

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}$

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

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Correct Option: A

The distance between two atoms in a molecule is measured in the order of Angstrom.

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:

The given statement is true that distance between two atoms in a molecule is measured in the order of Angstrom.

Human life expectancy is of the order of

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

  1. $10^{6}s$

  2. $10^{7}s$

  3. $10^{8}s$

  4. $10^{9}s$

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Correct Option: A

In which of the following lists are the units an order from LONGEST to SHORTEST?

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

  1. light-year, kilometer, astronomical unit

  2. astronomical unit, kilometer, light-year

  3. kilometer, light-year, astronomical unit

  4. light-year, astronomical unit, kilometer

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Correct Option: D
Explanation:

$1$ Light year $=9.461\times 10^{15}\,m$


$1$ Astronomical unit $=1.496\times 10^{11}\,m$

$1$ kilometer $=1000\,m$

Socorrect answer is option (D).

State whether true or false.
Light year is the unit of time.

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

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Light year is the unit of distance and it is the distance covered by the light in time of one year. So the given statement is false.

A pilot while informing the position of the plane uses the following unit 

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

  1. Nauticle mile

  2. Metric ton

  3. mm of Hg

  4. Light year

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Correct Option: A
Explanation:

A nautical mile is a unit of distance that is approximately one minute of arc measured along any meridian.

1 Nauticle mile = 1.852 Km