Class- 8 Maths

Multiple Choice Question:-
If  $2^{a+2}$  +  $2^2$  = 8 , a=?

• 1

• 0

• -1

• 2

 $if\ 3\sqrt{\frac{x}{216\ }}+\frac{1}{4}\ =\ \frac{3}{8}\ then\ x\ =$  

•  $\frac{64}{27}$  

•  $\frac{27}{64}$  

•  $\frac{6}{8}$  

•  $\frac{36}{64}$  

The value of n in  $\frac{28\times5^n+2\times5^n}{8\times5^n-5^{n+1}}$  =  $10^n$  

• 0

• 1

• 2

• -1

Which of the following number is Pythagorean triplet?

• 4,5,7

• 5,6,8

• 6,7,9

• 6,8,10

Which of the following numbers can be the cube of an even number?

• 343

• 512

• 800

• 1331

Q6.  $3\sqrt{144}$   $\times$   $3\sqrt{169}$   $\times$   $3\sqrt{156}$  

• 165

• 561

• 156

• 615

Q7. Which of the following numbers is not a perfect cube?

• 125

• 1331

• $2^4$ $\times$ 18

• $3^4$ $\times$ 72

Q8. Which of the following numbers is a perfect cube?

• 2000

• 1600

• 8000

• 2700

Q9. Which of the following number can be cube of an integer?

• 5000

• -900

• 784

• 27000

  $3\sqrt{8000}$  +  $\left(\frac{8}{10}\right)^3$  

• 20.512

• 20.08

• 20.8

• 208