Which of the following is a contact force ?
1 point
(a) Gravitational force
(b) Frictional force
(c) Magnetic force
(d) Electric force
14. Which one of these characteristics does a smooth surface has
1 point
(a) Less frictional force
(b)More frictional force
(c) Sometimes less and sometimes more
(d) All of the above
15. The shaking of earth is called
1 point
(a) Tsunami
(b) Volcano
(c) Earthquake
(d) All of the above
16. The highest grade of coal is known as –
1 point
(a) Lignite
(b) Bituminous
(c ) Anthracite
(d) Peat
17. Which of the following is a renewable source of energy ?
1 point
(a) Tidal energy
(b) Coal
(c) Diesel
(d) Petrol
18. The gas produced , due to incomplete combustion of carbon fuels is –
1 point
(a) Carbon dioxide
(b) Carbon monoxide
(c) Sulphur dioxide
(d) Nitrogen dioxide
19. The amount of heat produced on complete burning of 10 kg of a given fuel in pure oxygen equals H kilojoule. The calorific value of that fuel would be equal to –
1 point
(a) (0.1H) kJ/kg
(b) (10H) kJ/kg
(c) (H+10) kJ/kg
(d) (H-10) kJ/kg
20. The highest temperature zone of a candle flame is its-
1 point
(a) Yellow zone
(b) Red zone
(c) Blue zone
(d) Orange zone
Answers
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Answer:
a of 1 is the content force
Answered by
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13.
frictional force
14.
less fictional force
15.
earthquake
16.
Anthracite
17.
Tidal energy
18.
carbondioxide
19.
10H
20.
blue flames
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