Karnataka Board PUCPUC Science Class 11

The Radius of a Circle is Stated as 2.12 Cm. Its Area Should Be Written as - Physics


The radius of a circle is stated as 2.12 cm. Its area should be written as


  • 14 cm2

  • 14.1 cm2

  • 14.11 cm2

  • 14.1124 cm2



14.1 cm2

Area of a circle, A=  \[\pi r^2\] On putting the values, we get:

\[A = \frac{22}{7} \times 2 . 12 \times 2 . 12\]

\[ \Rightarrow A = 14 . 1 {cm}^2\]

The rules to determine the number of significant digits says that in the multiplication of two or more numbers, the number of significant digits in the answer should be equal to that of the number with the minimum number of significant digits. Here, 2.12 cm has a minimum of three significant digits. So, the answer must be written in three significant digits.

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Chapter 2: Physics and Mathematics - MCQ [Page 28]


HC Verma Class 11, Class 12 Concepts of Physics Vol. 1
Chapter 2 Physics and Mathematics
MCQ | Q 6 | Page 28


India has had a long and unbroken tradition of great scholarship — in mathematics, astronomy, linguistics, logic and ethics. Yet, in parallel with this, several superstitious and obscurantistic attitudes and practices flourished in our society and unfortunately continue even today — among many educated people too. How will you use your knowledge of science to develop strategies to counter these attitudes ?

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