Tag: motion and measurement

Quizzes (11) Questions (114)

Questions Related to motion and measurement

Multiple choice physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

The base quantity among the following is:

  1. Speed

  2. Weight

  3. Length

  4. Area
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 A base quantity is one of a conventionally chosen subset of physical quantities, where no quantity in the subset can be expressed in terms of the others. There are seven basic fundamental quantities: Length, mass, time, electric current, amount of substance, luminous intensity and temperature. So, the base quantity among the following is length.

Multiple choice physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

If $L = \left( {20 \pm 0.01} \right)m$ and $B = \left( {10 \pm 0.02} \right)m$ then $\dfrac{L}{B}$ is 

  1. $ \left( {2 \pm 0.03} \right)m$
  2. $ \left( {2 \pm 0.015} \right)m$
  3. $ \left( {2 \pm 0.01} \right)m$
  4. $ \left( {2 \pm 0.005} \right)m$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$l=20\pm 0.01, B=10\pm 0.02$

Take $l=20+0.01, B=10+0.02$
Then $\cfrac {l}{B}=\cfrac {20.01}{10.02}=1.997$
Taken $l= 20-0.01$, $B=10-0.02$
There $\cfrac {l}{B}=\cfrac {19.99}{9.98}=2.003$
$\therefore$ The answer is $(2\pm 0.003)m$ .

Multiple choice physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

Which quantities are measured in the same unit?

  1. energy, power and work

  2. energy and power, but not work

  3. energy and work, but not power

  4. power and work, but not energy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Quantity             Dimension
Energy              $ML^2T^{-2}$
Work                  $ML^2T^{-2}$
Power                 $ML^2T^{-3}$

So, the dimension of energy and work is same but different to power.
Option (C) is correct.