7th Grade > Mathematics
EXPONENTS AND POWERS MCQs
Total Questions : 102
| Page 2 of 11 pages
Answer: Option B. -> 2.17×107
:
B
21700000 can be written as
2.17×10000000=2.17×107
:
B
21700000 can be written as
2.17×10000000=2.17×107
:
From the law of exponent, we have,
(am)n=(a)mn
Therefore,
(102)2=104=10000
Answer: Option B. -> 73
:
B
343 can be written as
343=7×7×7
so, 343=73
:
B
343 can be written as
343=7×7×7
so, 343=73
Answer: Option B. -> False
:
B
2252 = 425
−2252 = −425
Hence, the given statement is false.
:
B
2252 = 425
−2252 = −425
Hence, the given statement is false.
Answer: Option A. -> True
:
A
From the law of exponents, we know that
am×bm=(ab)m
Thus, the given statement is true.
:
A
From the law of exponents, we know that
am×bm=(ab)m
Thus, the given statement is true.
Answer: Option B. -> 28×53
:
B
32000 can be written as
32000=(2×2×2×2×2)×1000=25×103
(as32=2×2×2×2×2)
= 25×(2×2×2×5×5×5)
= 25×23×53
= 28×53
:
B
32000 can be written as
32000=(2×2×2×2×2)×1000=25×103
(as32=2×2×2×2×2)
= 25×(2×2×2×5×5×5)
= 25×23×53
= 28×53
:
Here, 4 is called the exponent.
Answer: Option B. -> False
:
B
LHS = (25)2=425
RHS = −(25)2=−425
Hence, the given statement is false.
:
B
LHS = (25)2=425
RHS = −(25)2=−425
Hence, the given statement is false.
Answer: Option B. -> 1.234×10−1
:
B
In standard form, any number is expressed in powers of 10. The decimal number must be in between 1 and 10.
0.1234=1.23410=1.234×10−1
:
B
In standard form, any number is expressed in powers of 10. The decimal number must be in between 1 and 10.
0.1234=1.23410=1.234×10−1
:
Step: 2 Marks
Application: 1 Mark
Answer: 1 Mark
The area of land owned by Xis
=34m2=81m2
The value of given property is
=(81)×(50)=Rs.4050
The area of land owned byY is
43m2=64m2
The value of given property is
=(64)×(50)=Rs.3200
⇒ Value of property owned byX is greater than property owned by Y.
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