Physics · Science General

Units and Measurement

1,044 Questions

Master the fundamentals of physics with these practice questions on units and measurement. The topics include fundamental SI units, derived quantities, and specific units for power, force, and light. These questions are essential for building a strong foundation for competitive exams.

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Units and Measurement Questions

Multiple choice physics measurement and measuring instrument measuring distance of celestial bodies unconventional units of measurements units of mass

What is the value of $1  \ m $ in $\mathring{A}$?

  1. $10^{-10}$
  2. $10^{5}$
  3. $10^{7}$
  4. $10^{10}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
$1 m = 10^{10} \mathring{A}$
or we can say 1 angstrom $=10^{-10} m$
The natural sciences and technology often uses angstrom to express sizes of atoms, molecules, microscopic biological structures, and lengths of chemical bonds, arrangement of atoms in crystals, wavelengths of electromagnetic radiation.

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

One angstrom is equal to _________ .

  1. $\displaystyle { 10 }^{ -12 }m$
  2. $\displaystyle { 10 }^{ -10 }m$

  3. the time taken by Neil Armstrong to reach the moon

  4. the distance travelled by Neil Armstrong on the surface of the moon
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Angstrom is a very small unit of distance.
$1 \ angstrom = 10^{-10} \ m$
Multiple choice physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

Par sec is a unit of:

  1. angle

  2. velocity

  3. time

  4. distance
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The parsec is a unit of length used to measure the large distances to astronomical objects outside the Solar System. One parsec is approximately equal to 31 trillion kilometres or about 3.26 light-years. One parsec is the distance to an object whose parallax angle is one arcsecond.

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

1 AU is equal to

  1. $\displaystyle 1.5\times { 10 }^{ 11 }m$
  2. $\displaystyle 1.5\times { 10 }^{ 10 }m$
  3. $\displaystyle 1.5\times { 10 }^{ 9 }m$
  4. $\displaystyle 1.5\times { 10 }^{ -11 }m$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
One astronomical unit is defined as the distance between the sun and the earth.
$ 1 \ AU = 1.5\times 10^{11} \ m$