**Exponents and powers MCQ Questions Class 8 Maths Chapter 12**

__Chapter 12__

__Chapter 12__

__Exponents and powers__

__Exponents and powers__

**Question 1: **

**Find 5****° =? **

**(a) 12 **

**(b) 21 ^{5} = 5° **

**(c) 5° = 1 **

**(d) 5 = 2 **

**Ans: **

**5° = 5/5 = 1 = 5° (c) **

** **

**Question 2: **

**3 ^{-3} =?, Find the value of 3^{-3} **

**(a) 1 **

**(b) 1/3 **

**(c) 1/9 **

**(d) 1/27 **

**Ans: **

**3 ^{-3} = 1/3^{3} = 1/27 (a) **

** **

**Question 3: **

**Find the value of (-5) ^{8} **

**× (-5)**

^{-3}**(a) (-5) ^{5} **

**(b) (-5) ^{11} **

**(c) 1/(-5) ^{5} **

**(d) (-5)****° **

**Ans: **

**(-5) ^{8} **

**× (-5)**

^{-3}= (-5)^{8-3}= (-5)^{5}(a)** **

**Question 4: **

**Simplify [(-9) ^{4} **

**÷ (-9)**

^{-10}]**× (-9)**

^{-10}**(a) 1/-729 **

**(b) 1/2****7 **

**(c) 6561 **

**(d) 1/6561 **

**Ans: **

**[(-9) ^{-4}/(-9)^{-10}] **

**× (-9)**

^{-10}**= (-9) ^{-4} **

**= 1/(-9) ^{4} = 1/6561 (d) **

** **

**Question 5: **

**Evaluate (-5) ^{-4}/(-25)^{-8} **

**(a) 5 ^{8} **

**(b) 5 ^{10} **

**(c) 5 ^{12} **

**(d) 5 ^{9} **

**Ans: **

**(-5) ^{-4}/(-25)^{-8} = (-25)^{8}/(-5)^{4} **

**= (-5) ^{16}/(-5)^{4} = (-5)^{12} = 5^{12} (c) **

** **

**Question 6: **

**Find (5****° + 4 ^{2}) – (2^{2} **

**÷ (2)**

**(a) 23 **

**(b) 21 **

**(c) 19 **

**(d) 25 **

**Ans: **

**(5****° + 4 ^{2}) – (2^{2} **

**÷ (-2))**

**= (1 + 16) – (4 ÷ (-2)) **

**= 17 + 2 **

**= 19 (c) **

** **

**Question 7: **

**Find the value of x. 3 ^{x} **

**× 3**

^{-9}= 3^{-15}**÷ 3**

^{8}**(a) 14 **

**(b) -14 **

**(c) -15 **

**(d) -23 **

**Ans: **

**3 ^{x} **

**× 3**

^{-9}= 3^{-15}/3^{8}**3 ^{x} × 3^{-9} = 3^{-23} **

**3 ^{x} = 3^{-14} **

**x = -14 (b) **

**In case you have missed:- Previous Chapter MCQ Questions**

**Question 8: **

**Find (3/4) ^{-3} **

**(a) 25 **

**(b) -25 **

**(c) 64/27 **

**(d) 27/64 **

**Ans: **

**(3/4) ^{-3} = 4^{3}/3^{3} = 64/27 (c) **

** **

**Question 9: **

**Find the value of (1/2) ^{-3} + (1/3)^{-2} + (1/5)^{-3}**

**(a) 142 **

**(b) 144 **

**(c) 146 **

**(d) 188 **

**Ans: **

**(1/2) ^{-3} + (1/3)^{-2} + (1/5)^{-3} **

**= 2 ^{3} + 3^{2} + 5^{3} **

**= 8 + 9 + 125 **

**= 142 **

**142 (a) **

** **

**Question 10: **

**Evaluate {(1/2) ^{-2} – (1/3)^{-3}}^{-2} **

**(a) 1/529 **

**(b) -529 **

**(c) 1/-529 **

**(d) 1/****425**

**Ans: **

**{(1/2) ^{-2} – (1/3)^{-3}}^{-2} **

**= {4 – 27} ^{-2} **

**= {-23} ^{-2} **

**= 1/23 ^{2} **

**= 1/529 (a) **

** **

**Question 11: **

**Find {(-4/5) ^{-2}}^{3} **

**(a) 4096/15625 **

**(b) 15625/4096 **

**(c) -25 **

**(d) +23 **

**Ans: **

**(-4/5) ^{-6} **

**= (5/-4) ^{6} **

**= 15625/4096 (b) **

** **

**Question 12: **

**Express the following numbers in the standard form? **

**4197000000 **

**(a) 4197×10 ^{6} **

**(b) 4197×10 ^{8} **

**(c) 4197×10 ^{-3} **

**(d) 4197 **

**Ans: **

**4197000000 = 4197×1000000 **

**= 4197 × 10 ^{6} (a) **

** **

**Question 13: **

**0.00000009527 **

**(a) -9527 ^{2} **

**(b) 9527 ^{4} **

**(c) 9.527×10 ^{-8} **

**(d) 9527×10 ^{8} **

**Ans: **

**0.00000009527 = 9.527×10 ^{-8} (c) **

** **

**Question 14: **

**Express the following numbers in usual form. **

**3.04 × 10 ^{-6} **

**(a) 0.00000304 **

**(b) 0.000304 **

**(c) -1/304 **

**(d) 0.0304 **

**Ans: **

**3.04/1000000 = 0.00000304 (a) **

** **

**Question 15: **

**1.0001 × 10 ^{8}**

**(a) 10010000 **

**(b) 100010000 **

**(c) 10001000 **

**(d) -10001000 **

**Ans:**

**1.0001×10 ^{8}**

**= 1.0001 × 100000000 **

**= 100010000 (b)**

**In case you have missed:- Next Chapter MCQ Questions**

**Here is your solution of Exponents and powers MCQ Questions Class 8 Maths Chapter 12**

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