Question

Question 18.
Friction due to fluids is called
(a) force
(b) pressure
(c) friction
(d) drag
Question 19.
The number of vibrations made by a vibrating body in one second is
(a) frequency
(b) noise
(c) loudness
(d) pitch
Question 20.
Electroplating prevents
(a) corrosion
(b) passing of current
(c) dissociation
(d) shining​

Answer 1

Answer:

i) drag

ii) frequency

iii)corrosion

Answer 2

Answer:

18=drag

19=frequency

20=corrosion