Test: Power Play - 1 - Class 8 MCQ

The correct answer is 61⁵ because:

• The number 61 is multiplied by itself five times.
• This can be written as 61 raised to the power of 5.

Factorisation of 32 is 2 x 2 x 2 x 2 x 2
32 = 2⁵
X = 5

32 can be expressed as:

• 2 × 2 × 2 × 2 × 2 = 2⁵

Therefore, the correct answer is A.

Multiply 10 twice i.e 10 × 10 because they asked 'a' to the power 2 . so multiply by twice, the solution is 100 .

By exponent law we know:

a⁰ = 1

100⁰ + 20⁰ + 5⁰ = 1+1+1 = 3

By laws of exponents:

a^m x aⁿ = a^m+n

2² x 2³ x 2⁴ = 2²⁺³⁺⁴ = 2⁹

(-2)^-3*(-2)^-4 = (-2)^(-3)+(-4)  = (-2)^(-7)

Explanation: 4² x 4^-2

By law of exponents:

= 4^2+(-2) = 4^2-2 = 4⁰ = 1

Any number written in the form m x 10ⁿ is a standard form if m is between 1 and 10, so we have 23  zeros after 868  and two decimal places  to make 868 less than 10. So we have 8.68 x 10²⁵Kg

Any number written in the form m x 10ⁿ is a standard form if m is between 1 and 10, so we have 18 zeros before 16 and after decimal and one decimal place after 1 to make 16 less than 10. So we have 1.6 x 10^-19.

Explanation:

• To convert a number into standard form, we need to express it as a number between 1 and 10 multiplied by a power of 10.


• For the number 9030000000, we can express it as 9.03 × 10⁹.


• Therefore, the standard form of 9030000000 is A: 9.03 × 10⁹.