Question

1. which of the following energy sources was widely used before coal became popular?

a) solar panels
b) muscle power (humans or animals)
c) nuclear power
d) electricity generated from turbines

1. which of the following is a key advantage of coal compared to wind or water power?

a) coal provides energy only when the sun shines
b) coal can be burned at any time, providing a steady source of energy
c) coal never runs out
d) coal does not produce any pollution

1. what important invention in the 1700s helped humans use coals energy more effectively?

a) the windmill
b) the solar panel
c) the steam engine
d) the electric motor

Explanation:

• Question 4: Before coal became popular, muscle power (humans or animals) was widely used. Solar panels and nuclear power are more modern energy sources. Electricity from turbines also came after the initial widespread use of muscle - based energy.
• Question 5: Coal can be burned at any time, providing a steady source of energy. Wind and water power are dependent on natural conditions (wind speed, water flow). Coal is a non - renewable resource (so it can run out) and it does produce pollution.
• Question 6: The steam engine in the 1700s helped humans use coal's energy more effectively. Windmills use wind energy, solar panels use solar energy, and electric motors are more related to electrical energy which became prominent after the steam engine era.

Answer:

1. B. Muscle power (humans or animals)
2. B. Coal can be burned at any time, providing a steady source of energy
3. C. The steam engine