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Concepts Of Physics MCQ Edition [Volume 1]
Exam
Concepts Of Physics MCQ Edition [Volume 1]
Subject
Physics
Chapter
Introduction to Physics

Concepts Of Physics MCQ Edition [Volume 1] · Physics · Introduction to Physics

The surface tension of water is 72 dyne/cm . Convert this value...

The surface tension of water is 72 dyne/cm72 \text{ dyne/cm}. Convert this value into SI units.

Options

  1. A720 N/m720 \text{ N/m}
  2. B0.072 N/m0.072 \text{ N/m}
  3. C0.72 N/m0.72 \text{ N/m}
  4. D7.2 N/m7.2 \text{ N/m}

Correct answer

B. 0.072 N/m0.072 \text{ N/m}

Step-by-step solution

The given value of surface tension is 72 dyne/cm72 \text{ dyne/cm}.

The SI unit of surface tension is N/m\text{N/m}.

Using the conversion factors:
1 dyne=10−5 N1 \text{ dyne} = 10^{-5} \text{ N}
1 cm=10−2 m1 \text{ cm} = 10^{-2} \text{ m}

Substituting these into the given value:
72 dyne/cm=72×10−5 N10−2 m72 \text{ dyne/cm} = 72 \times \dfrac{10^{-5} \text{ N}}{10^{-2} \text{ m}}

=72×10−3 N/m= 72 \times 10^{-3} \text{ N/m}

=0.072 N/m= 0.072 \text{ N/m}
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