Chapter – 12 (Exponent and Powers)class 8th

Chapter – 12 (Exponent and Powers)

Class –VIII

                                        Very Short Answer Type Questions                                         ( 1 Mark)

Q1. Evaluate : i) 5^-4

                                      ii) ( -7)^-2 

Q2. Evaluate : 8⁹8³

Q3. Find the value of ‘m’ in 2^m-3 = 13^x

Q4. Express 5.0810^-6 in the usual form.

Q5. Express 6080000000000000 in the standard form.

                                  Short Answer Type Questions                                         ( 2 Mark)

Q6. Solve : 2^2x+2 = 4^2x-1

Q7. 8.5 × 10¹³ + 8.6 × 10¹⁴ =?

Q8. Which is largest among 2^1/2, 3^1/3, 8^1/8 and 9^1/9.

Q9. 5.3 × 10¹⁶ - 3.3 × 10¹⁷ =?

Q10. Take a number x, and multiply it with 4. Take the cube of the resulting number. What is the ratio of this number to the cube of the original number?

                            Long Answer Type Questions                                                 ( 3 Mark)

Q11.  Find the value of 5^-3  1/5³.

Q12.  Find the value of ‘m’so that (-3)^m+1 * (-3)⁵ = (-3)⁷.

Q13.  If (216)^x then find x.

Q14. Evaluate : ( 5^-1  2^-1)  6^-1

Hots

Q15. By what number should ()^-3 be divided so that the quotient is ()^-2 ?

Q16. Mass of earth is ( 5.97  10²⁴)kg and mass of moon is (7.35  10²²)kg. What is the total mass of the two?

Q17. In a stack there are 5 books of thickness 20mm and 5 paper sheets each of thickness 0.016mm. What is the total thickness of the stack?