CBSE Class 8 Maths Power Play (Class 8 NCERT New) Quiz 4

1. A pond’s lotus count doubles each day. If it is fully covered on day 30, on which day was it half covered?

A Day 1 because it starts from one lotus B Day 28 because halving needs two days C Day 29 because doubling works backward one day D Day 15 because it is the midpoint

2. Estu has 4 dresses and 3 caps. How many different outfits can be made by choosing one dress and one cap?

A 7 B 10 C 12 D 24

3. A lock uses a 3-digit code where each digit can be 0–9. How many possible codes are there in total?

A 90 B 900 C 1000 D 9999

4. What is the value of ?

A Undefined B 1 C 0 D 2

5. A number in scientific notation is written as x \times 10^y with 1 ≤ x in this form?

A magnitude B multiplier C exponent D coefficient

6. Roxie weighs 45 kg and 1 kg of jaggery costs ₹70. Estimate the worth of jaggery equal to Roxie’s weight.

A ₹3570 around B ₹3150 approximately C ₹3000 roughly D ₹4500 exactly

7. Which population size is closest to in scientific notation?

A Roughly 242 Kakapo remaining today B Around 33 billion global chickens alive C About 200 million water buffaloes worldwide D Approximately 1.3 billion starlings worldwide

8. Which time is closest to seconds?

A About 1 day B About 8 minutes C About 3 hours D About 15 minutes

9. Which name corresponds to in the modern international large-number system?

A decillion B octillion C nonillion D quintillion

10. 2. Which of the following exponents in expanded form represents the number 5629.354?

A 5 × 104 + 6 × 103 + 2 × 102 + 9 × 101 + 3 × 10−1 + 5 × 10−2 + 4 × 10−3 B 5 × 104 + 6 × 103 + 2 × 102 + 9 × 10−1 + 3 × 10−2 + 5 × 10−3 + 4 × 10−4 C 5 × 103 + 6 × 102 + 2 × 101 + 9 × 100 + 3 × 10−1 + 5 × 10−2 + 4 × 10−3 D 5 × 103 + 6 × 102 + 2 × 101 + 9 × 10−1 + 3 × 10−2 + 5 × 10−3 + 4 × 10−4