Download App

Exponents and Powers — MATHS STD 7 — Question

Gujarat BoardEnglish MediumSTD 7MATHSExponents and Powers1 Mark
MCQ
If $2^n = 4096,$ then $2^{n-5} =$
  • ✓
    $128$
  • B
    $64$
  • C
    $256$
  • D
    $32$
✓

Answer

Correct option: A.
$128$
Since,
As, $2^n = 4096$
$\Rightarrow 2^n = 2^{12}$
Comparing the exponent of both the sides, we get:
$n = 12$
Now, $2^{n-5} = 2^{12-5}$
$= 2^7$
$= 128$
Hence, the correct alternative is option $(a)$.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q. [1 Marks Each]" from Exponents and Powers→Exponents and Powers — all question types→MATHS STD 7 question papers→Gujarat Board STD 7 question papers→Gujarat Board question paper generator→

Similar questions

If $a$ and $b$ are two integers, then which of the following may not be an integer?
→
The ages of father and son are $45$ years and $10$ years. The ratio of their ages is.
→
In standard form, the number 829030000 is written as $k \times 10^8$, where $k$ is equal to
→
The perimeter of a rectangle is $30 m$. Its length is $10 m.$ Its breadth is
→
What is the average amount of interest per year which the company had to pay during this period$?$
→
Mark $(\checkmark)$ against the correct answer in the following: Which is greater between $\frac{-4}{9}$ and $\frac{-5}{12}$ ?
 
→
If $k + 7 = 16$, then the value of $8k - 72$ is:
→
Mark $(\checkmark)$ against the correct answer in the following:
If the cost price of $12$ pencils is equal to the selling price of $15$ pencils, then the loss per cent is:
→
Cube of $\big(\frac{-1}{4}\big)$ is:
→
Reciprocal of the fraction $\frac{2}{3}$ is:
→