Question

MCQS :
(9) The reaction between Zinc and Acid is________.

(a)Combination reaction
(B) Decomposition reaction
(C)Exothermic reaction
(d) both (a) and (b)


(10) Which of the following is not produced when Acid react with Metal-Carbonates or
Metal Bicarbonates?
(a)Salt
(b) Carbon-dioxide
(c) Water
(d) Metal-Oxide


(11) In reflex arc sensory nerves and motor nerves connect with each other at________.
(a) nuron
(b) brain
(c) spinal cord
(D) hind brain


(12) Speed of light in air or vaccume is________m/s
(a)3.8 X 105 m/s
(b)3 X 105 m/s
(c)3 X 108 m/s
(d)2.7 X 108 m/s

Answer 1

Explanation:

(9) exothermic reaction

(10) metal oxide

(11)

(12) 3 * 10^8 m/s