1
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Let $$f(a) = {{a - 1} \over {a + 1}}$$ consider the following :

1. $$f(2a) = f(a) + 1$$

2. $$f\left( {{1 \over a}} \right) = - f(a)$$

Which of the above is/are correct?
A
Only 1
B
Only 2
C
Both 1 and 2
D
Neither 1 nor 2
2
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Let $$f(x):\left\{ {\matrix{ {x,} & {x\,is\,rational} \cr {0,} & {x\,is\,irrational} \cr } } \right.$$

and $$g(x):\left\{ {\matrix{ {x,} & {x\,is\,rational} \cr {0,} & {x\,is\,irrational} \cr } } \right.$$

if $$f:R \to R$$ and $$g:R \to R$$, then (f $$-$$ g) is
A
one-one and into
B
neither one-one nor onto
C
many-one and onto
D
one-one and onto
3
NDA 2018 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If $$f(x) = {{\sqrt {x - 1} } \over {x - 4}}$$, defines a function on R, then what is its domain?
A
($$-$$$$\infty$$, 4) $$\cup$$ (4, $$\infty$$)
B
[4, $$\infty$$)
C
(1, 4) $$\cup$$ (4, $$\infty$$)
D
[1, 4) $$\cup$$ (4, $$\infty$$)
4
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
When one of the following is correct in respect of the function f : R $$\to$$ R+ defined as f(x) = |x + 1| ?
A
f(x2) = [f(x)]2
B
f(|x|) = |f(x)|
C
f(x + y) = f(x) + f(y)
D
None of the above
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