Velocity of X-ray is:: (A) 1 lakh miles/sec, (B) 2 lakh miles/sec, (C) 3 lakh miles/sec, (D) 0.5 lakh miles/sec
Answer is B. X-rays are electromagnetic radiations with following properties:

Velocity = 3 x 108 m/sec or 2 lakh miles/sec
They cannot be focused, reflected or refracted.
They cast the shadow of the objects falling in their path.
They are affected by electric and magnetic field.

Ref: Karjodkar 3rd Ed, Pg-72