51. Which gas, in air is necessary, for burning, process: ______________________?
(a) Oxygen
(6) Nitrogen
(c) Carbon dioxide
(d) agron
52. Which of these, are completely, soluble in ,water: ____________________?
(a) Sand
(6) Cooking oil
(c) Wax
(d) Table salt
53. The main, source of, energy, is: _____________________?
(a) Water
(b) wind
(c) Sun
(d) magnet
54. A moving, car has_____________________,energy?
(a) Kinetic
(b) Potential
(c) Tidal
(d) Solar
55. Which one, is not a form, of energy?
(a) Heat
(b) Light
(c) Sound
(d) Lamp
56. In a battery, chemical energy, changed into: _______________________?
(a)Heat
(b) Sound
(c) Light
(d) Electrical
57. There are, types of simple, machines,?
(a) 5
(b) 4
(c) 6
(d) 8
58. Image formed, by convex mirror, is always,?
(a)Virtual
(b) Erect and large
(c) Real
(d) Inverted
59. Concave mirror, has the capability, to___________________a, parallel beam, of light?
(a) Converge
(b) Diverge
(c) Dispense
(d) No changes
60. A “microscope” is an instrument, used to produce, a mage?
(a) Large
(b) Small
(c) Shark
(d) Far
