Question

(subsemneenist blue (c)dark blutet
14, which of the following diverges the parallel rays of heating
(a) Concave mirror (b) convex mitor (c) plane mirror (d) Convex les
15. which type of mirror is used by a dentist?
(a)Plane (b) convex (c) concave (d) shining
16, which of the following is the requirement for regular reflection of sound
(a)Smooth surface (b) Rough surface (c) Vacuum (d) transparent rough surface
17, the chemical name of bleaching powder is
(a)Chlorine (b) Calcium hydroxide (c) calcium oxide (d) calcium hypochlorite
18. is used for disinfection of drinking water
(a) Copper sulphate (b) Alum (c) bleaching powder (d) Sodium Carbonate
19, the activated charcoal is used in
(a) Laundry (b) Bathroom(c) Laboratory (d) Kitchen
20,
is used to make the active substance Co2 in fire extinguisher
(a) Na2Co3(b) NaHco3(c) Naci(d) NaNo3
$255 = 15555555$
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Answer 1

Answer:

B

A

C

B

A

D

C is the answer

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