Loading [MathJax]/jax/output/CommonHTML/jax.js
MCQExams
0:0:2
CBSE
JEE
NTSE
NEET
Practice
Homework
×
CBSE Questions for Class 8 Maths Exponents And Powers Quiz 3 - MCQExams.com
CBSE
Class 8 Maths
Exponents And Powers
Quiz 3
State true or false.
10
−
2
=
1
100
Report Question
0%
True
0%
False
Explanation
True.
Using
x
−
m
=
1
x
m
10
−
2
=
1
10
2
=
1
10
×
10
=
1
100
3
−
2
can be written as
Report Question
0%
3
2
0%
1
3
2
0%
1
3
−
2
0%
−
2
3
Explanation
We will use, law of exponent
a
−
m
=
1
a
m
, where
a
=
non zero integer
Therefore,
3
−
2
=
1
3
2
Mark tick against the correct answer of the following:
(
2
3
)
−
5
=
?
Report Question
0%
32
243
0%
243
32
0%
−
32
243
0%
−
243
32
Explanation
We know that,
(
a
b
)
−
n
=
(
b
a
)
n
∴
(
2
3
)
−
5
=
(
3
2
)
5
=
3
5
2
5
[
∵
(
a
b
)
n
=
(
a
n
b
n
)
]
=
243
32
Hence the correct answer is
O
p
t
:
[
B
]
The value of
1
4
−
2
is
Report Question
0%
16
0%
8
0%
1
16
0%
1
8
Explanation
We will use, law of exponent
a
−
m
=
1
a
m
,
Therefore,
1
4
−
2
=
1
1
4
2
=
1
1
16
=
1
×
16
=
16
The value of
(
2
5
)
−
2
is
Report Question
0%
4
5
0%
4
25
0%
25
4
0%
5
2
Explanation
We will use, law of exponent
a
−
m
=
1
a
m
where
a
=
non-zero integer
(
2
5
)
−
2
=
1
(
2
5
)
2
=
1
4
25
=
25
4
The value of
(
−
2
)
2
×
3
−
1
is
Report Question
0%
32
0%
64
0%
−
32
0%
−
64
Explanation
To find the value of
(
−
2
)
2
×
3
−
1
(
−
2
)
2
×
3
−
1
=
(
−
2
)
6
−
1
=
(
−
2
)
5
=
(
−
2
)
×
(
−
2
)
×
(
−
2
)
×
(
−
2
)
×
(
−
2
)
=
(
4
)
×
(
4
)
×
(
−
2
)
=
(
16
)
×
(
−
2
)
=
−
32
Hence, the result
=
−
32
The value of
(
7
−
1
−
8
−
1
)
−
1
−
(
3
−
1
−
4
−
1
)
is
Report Question
0%
44
0%
56
0%
68
0%
12
Explanation
Using law of exponents,
a
−
m
=
1
a
m
⇒
(
7
−
1
−
8
−
1
)
−
1
−
(
3
−
1
−
4
−
1
)
−
1
=
(
1
7
−
1
8
)
−
1
−
(
1
3
−
1
4
)
−
1
⇒
(
1
×
8
−
1
×
7
56
)
−
1
−
(
1
×
4
−
1
×
3
12
)
−
1
=
(
8
−
7
56
)
−
1
−
(
4
−
3
12
)
−
1
=
(
1
56
)
−
1
−
(
1
12
)
−
1
Again we will use
a
−
m
=
1
a
m
⇒
(
7
−
1
−
8
−
1
)
−
1
−
(
3
−
1
−
4
−
1
)
−
1
=
(
1
56
)
−
1
−
(
1
12
)
−
1
=
56
−
12
=
44
.
On multiplying ________ by
2
−
5
we get
2
5
Report Question
0%
1
0%
2
0%
−
1
0%
0
Explanation
2
−
5
×
2
5
=
1
2
5
×
2
5
=
1
(
−
5
7
)
−
5
is equal to
Report Question
0%
(
5
7
)
−
5
0%
(
5
7
)
5
0%
(
7
5
)
5
0%
(
−
7
5
)
5
Explanation
Using law of exponent
a
−
m
=
1
a
m
[Where,
a
is non-zero integer]
(
−
5
7
)
−
5
=
1
(
−
5
7
)
5
=
(
−
7
5
)
5
If
x
be any integer different from zero and
m
be any integers then
x
−
m
is equal to
Report Question
0%
x
m
0%
−
x
m
0%
1
x
m
0%
−
1
x
m
Explanation
Using law of exponents,
a
−
m
=
1
a
m
[Where,
a
is non-zero integer]
Similarly,
x
−
m
=
1
x
m
(
−
7
5
)
−
1
is equal
Report Question
0%
5
7
0%
−
5
7
0%
7
5
0%
−
7
5
Explanation
Using law of exponent
a
−
m
=
1
a
m
[Where,
a
is non-zero integer]
(
−
7
5
)
−
1
=
1
(
−
7
5
)
=
(
−
5
7
)
The expression for
3
5
with a negative exponent is _________.
Report Question
0%
1
3
−
5
0%
−
1
3
−
5
0%
3
−
5
0%
1
3
5
Explanation
Using
a
m
=
1
a
−
m
3
5
=
1
3
−
5
The value of
[
2
−
1
×
3
−
1
]
2
is ______.
Report Question
0%
6
2
0%
1
6
2
0%
−
6
2
0%
−
1
6
2
Explanation
[
2
−
1
×
3
−
1
]
2
=
1
(
2
×
3
)
2
=
1
6
2
State whether the following statement is true (T) or false (F):
The value of
(
−
2
)
−
3
is
−
1
8
Report Question
0%
True
0%
False
Explanation
(
−
2
)
−
3
=
1
(
−
2
)
3
=
1
−
8
=
−
1
8
Choose the correct answer from the given four options:
The value of
(
6
−
1
−
8
−
1
)
−
1
is
Report Question
0%
−
1
2
0%
−
2
0%
1
24
0%
24
Explanation
(
6
−
1
−
8
−
1
)
−
1
=
(
1
6
−
1
8
)
−
1
=
(
4
−
3
24
)
−
1
=
(
1
24
)
−
1
=
24
Choose the correct answer from the given four options:
(
−
3
2
)
−
1
is equal
Report Question
0%
2
3
0%
−
2
3
0%
3
2
0%
4
9
Explanation
(
−
3
2
)
−
1
=
−
2
3
If the coefficients of
x
7
&
x
8
, in the expansion of
[
2
+
x
3
]
n
are equal, then the value of n is:
Report Question
0%
15
0%
45
0%
55
0%
56
0:0:2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
0
Answered
1
Not Answered
16
Not Visited
Correct : 0
Incorrect : 0
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Practice Class 8 Maths Quiz Questions and Answers
<
>
Support mcqexams.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page