Question

1. ___________ is used in water purification systems
a) Silver
b) Carbon
c) Iodine
d) None of the above

2._________ friction is called self adjusting force
a) Static
b) Sliding
c) Fluid
d) Rolling

3.Substances used to reduce friction are called______
a) Metals
b) Non metals
c) Lubricants
d) Plastics​

Answer 1

Answer:

1. d)

2. a)

3. c)

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Answer 2

Answer:

1. Option (d)

2 Option (a)

3. Option (c)