Q1. Mark ck against the correct answer in the following:
By what number should (-8) be mulplied to get 10 ?
1.
2.
3.
4. None of these.
1 Mark
Ans: 3.
Soluon:
Required number = 10 ÷ (-8)
Q2.
1. 64
2. 16
3. 32
4. 4
1 Mark
Ans: 3. 32
Soluon:
Since,
Hence, the correct alternave is opon (c).
Q3. Mark ck against the correct answer in the following:
1.
2.
3.
4.
1 Mark
Ans: 3.
Soluon:
Q4.
If abc = 0, then find the value of
1 Mark
(
✓
)
-1 -1
4
5
−5
4
−4
5
−4
5
-1 -1
= ÷
( )
= ×
1
10 1
−8 1
10 −8
1
=−4
5
{
(33)2− (31)2
}
5
7
{
(33)2− (31)2
}
5
7
= {1089 − 961} 5
7
= {128}5
7
= {27}5
7
= 27× 5
7[As,(xm)n= xmn]
= 25
= 32
(
✓
)
( )
3÷
( )
8=?
−1
5−1
5
(
−
)
5
1
5
( )
11
−1
5
(−5)5
( )
5
1
5
(−5)5
∵
( )
3÷
( )
8
−1
5−1
5
=
(
−
)
3−8 =
(
−
)
−5
1
51
5
= (−5)5
{
(xa)b
}
c
