Maths MCQs Class 12 – Pakistan MCQs Test | NTS, FPSC, PPSC, SPSC, KPPSC, CSS Questions

In a rectangular hyperbola x^2/a^2 -y^2/b^2=1 :

(A) a>b
(B) a<b
(C) a=2b
(D) a=b

Answer: (D) a=b

(i+j) x (j+k) = ?
(A) 0
(B) i-j+k
(C) i+j+k
(D) i+j-k

The answer is: (B) i-j+k

If f : R━>R is given by f(x) =x² , then f(2) = ?

(A) 6
(B) 4
(C) -4
(D) 8

The answer is: (B) 4
Solution
In the function f(x)=x², replace x by 2. If f(x)=x², then f(2)=(2)²=4

(A) $\frac{\sqrt7}{4}$
(B) $\frac{\sqrt17}{4}$
(C) $\frac{\sqrt21}{4}$
(D) $\frac{\sqrt27}{4}$

The answer is: (A) $\frac{\sqrt7}{4}$

(A) 1
(B) 0
(C) – 1
(D) ± 1

Answer: (B) 0