The predecessor of 1 in whole numbers is

(a) 0
(b) -1
(c) 2
(d) None of these

Q. The predecessor of 1 in natural numbers is

(a) 0
(b) 2
(c) -1
(d) None of these

Q. (cos²28° − sin²62°) = ?
(a) 0
(b) 1
(c) 2
(d) None of these

Q. $\frac{\tan 35°}{\cot 55°}+\frac{\cot 78°}{\tan 12°}=?$
(a) 0
(b) 1
(c) 2
(d) None of these

Q. If the roots of $x^2-bx+c=0$ are two consecutive integers, then b² − 4 c is
(a) 0
(b) 1
(c) 2
(d) none of these.

Q. The number of solutions of $x^2+\left|x-1\right|=1$ is
(a) 0
(b) 1
(c) 2
(d) 3