MCQ of Maths Class 9
1/a-b-1/a+b is equal to:
2a/a2 – b2
2b/a2-b2
-2a/a2-b2
-2b/a2-b2
(a+b)2-(a-b)2 = _______
ab
2ab
3ab
4ab
(a-b)3 = ………..
a3 + 3ab(a-b) – b3
a3 – 3ab(a-b) – b3
a3 + 3ab(a+b) – b3
a3 + 3ab(a-b) + b3
Mantissa of logarithm is :
Always positive
Always negative
Positive or negative
None of these
Conjugate of surd a a+√b is:
-a+√b
a-√b
√a+√b
√a-√b
Characteristics of log 5420 is ……………….. .
2
3
4
None of these
If 2x-3y=10, xy = 2 then 8×3 -27y3=?
1330
1340
1350
1360
Logarithms having base “10” are called ………… .
Common log
Briggs log
Both a and b
None of these
2x+1/3x+8 is a
rational expression
irrational expression
algebraic number
polynomial
Base in natural logarithm is ……………….. .
10
e
&
None of these
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