List of top Civil Structural and Transport Engineering Questions on Differential Equations asked in CUET (PG)

The solution(s) of the ordinary differential equation $y'' + y = 0$, is: 

(A) $\cos x$ 
(B) $\sin x$ 
(C) $1 + \cos x$ 
(D) $1 + \sin x$ 
Choose the most appropriate answer from the options given below: