Practice30Create account

Which of the following numbers is irrational?

Class 9Decimal Expansions of Real NumbersNumber Systems
  • A
  • B0.125
  • C
  • D0.101001000100001…

Step-by-Step Solution

The first number never ends and the blocks of zeros keep growing, so no block repeats — it is irrational. The others terminate or recur (22/7 = 3.142857142857…).
Answer: D) 0.101001000100001…

Master this chapter in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Decimal Expansions of Real Numbers practice questions

More Class 9 Decimal Expansions of Real Numbers practice

A team scores 200 runs in 30 overs. What is its run rate (runs per over) as a decimal?Long division of 3 by 11 is shown. What is the decimal expansion of 3 ÷ 11?In the magnified number line, point P is at 3.765. Between which two marked values does…A calculator shows 2 ÷ 3 = 0.6666667. Why does the last digit show 7?What is 5/7 as a decimal? (Hint: it uses the same digits as 1/7.)