MCQ
Which of the following is irrational?
- A$\sqrt{\frac{4}{9}}$
- B$\frac{4}{5}$
- C$\sqrt{7}$
- D$\sqrt{81}$
✓
Answer
- $\sqrt{7}$
Solution:
- Is incorrect, because $\sqrt{\frac{4}{9}}=\frac{\sqrt{4}}{\sqrt{9}}=\pm\frac{2}{3}$ (Rational)
- Is also incorrect, as $\frac{4}{5}$ is in the form of $\frac{\text{P}}{\text{Q}}(\text{Q}\neq0),$ (Rational)
- Is incorrect, because $\sqrt{7}$ is a non-terminating and Non-Repeating number.
- Is incorrect, because $\sqrt{81}=\pm9$ (Rational)
Hence, correct option is (c).
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
If $x+\frac{1}{x}=3$, then $x^6+\frac{1}{x^6}=$
→If $\sqrt{2}=1.4142$, then $\sqrt{\frac{\sqrt{2}+1}{\sqrt{2}-1}}$ is equal to
→Write the correct answer in the following:
The positive solutions of the equation ax + by + c = 0 always lie in the,
The positive solutions of the equation ax + by + c = 0 always lie in the,
The height of a conical vessel is 3.5cm. If its capacity is 3.3 litres of milk, then the diameter of its base is:
In a quadrilateral ABCD, AO and BO are the bisectors of $\angle\text{A}$ and $\angle\text{B}$ respectively, $\angle\text{C} = 70^\circ$ and $\angle\text{D} = 30^\circ.$ Then, $\angle\text{AOB} =\ ?$
→The number of interwoven isosceles triangles in a Sriyantra is:
If $\sqrt{2}=1.414$ than $\sqrt{\frac{(\sqrt{2}-1)}{(\sqrt{2}+1)}}=?$
→→
Which of the following variables are discrete?
- Size of shoes.
- Number of pages in a book.
- Distance travelled by a train.
- Time.
In the given figure, O is the centre of a circle. If $\angle\text{AOB}=100^\circ$ and $\angle\text{AOC}=90^\circ$ then $\angle\text{BAC}=?$
→