Question

Q:-1 All pushes and pulls are forces. Yes No Q:-2 Coal mainly contains a)carbon b)hydrogen c) nitrogen d)oxygen Q:-3 Anthracite contains ----- percent carbon. a)40 b60 c)96​ d)90 Q:-4 Pure form of carbon is a)coal b)coke c)coal tar d)coal gas Q:-5 Which of these is contact force? a)frictional force b) magnetic force c)gravitational force d)electrostatic force Q:-6 Which of the following is a non polluting fuel for vehicles? petrol diesel kerosene CNG Q:-7 Name the force that acts on all bodies on the earth at all times. Gravitational force Magnetic force Electrostatic force Muscular force Q:-8 Can a force act on object even when it is not in contact with the object? Yes No Q:-9 The natural resource known as black gold a)petroleum b)coal c) Natural gas d)diesel Q:-10 Name a force that opposes motion. Magnetic force Friction​ Muscular force Gravitational force Q:-11 The colour of crude oil pumped out from a well is a) Brown b)Red c) Black d)white Q:-12 Only the earth exerts gravitational force on all objects. True False Q:-13 By processing of coal in industry ,you get a)coal gas b)coal tar c)coke d)all of these Q:-14 Which of these can a force acting in an object not change? Direction of motion State of rest Shape Mass Q:-15 The process of conversion of wood into coal is called carbonisation. True False Q:-16 Which of these is not a natural source of energy? a)coal b)electicity c) sun d)petroleum Q:-17 Refining of petroleum is based on difference in a)boiling points b)melting points c)freezing points d)ignition tempreature Q:-18 An instrument used to measure liquid pressure is called Barometer Thermometer Pressure gauge Rain gauge Q:-19 The SI unit of pressure is a)kg/ m square b)kg/m cube c)pascal d)Newton Q:-20 Which fuel is used in jet aeroplanes? a)petrol b)diesel c)LPG d)kerosenePure form of carbon is a)coal b)coke c)coal tar d)coal gas

Answer 1

Answer:1/true

2/

Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen. ... As a fossil fuel burned for heat, coal supplies about a quarter of the world's primary energy and two-fifths of its electricity.

5/ a

6/kerosene

7/ gravitational force.

Answer 2

Answer:

ans 1 yes,ans 2 carbon, 3 percent, 4 coal,5 friction, 6 cng,7 gravitational force, 8 no,9 coal ,15 true, 16 electricity