Class 5 SST Question Answers - The Machine Age

Q1: What is a machine?
Ans: A machine is a device that performs or assists in performing tasks.

Q2: Name five simple machines.
Ans: Lever, wedge, wheel, pulley, screw.

Q3: What did early humans use to make tools?
Ans: Early humans used wood, stone, and bones to make tools.

Q4: What is the primary source of energy during the Machine Age?
Ans: The primary source of energy during the Machine Age was manpower.

Q5: Who used steam power to run water pumps in 1769?
Ans: James Watt used steam power to run water pumps in 1769.

Q6: What is the primary source of energy for generating electricity today?
Ans: The primary sources of energy for generating electricity today are coal, diesel, and water.

Q7: What is another name for crude oil?
Ans: Crude oil is also known as petroleum.

Q8: List three products that come from petroleum.
Ans: Three products that come from petroleum are petrol, diesel, and kerosene.

Q9: Name two greenhouse gases generated by burning fossil fuels.
Ans: Two greenhouse gases generated by burning fossil fuels are carbon dioxide and carbon monoxide.

Q10: What is the major clean source of energy discussed in the text?
Ans: The major clean source of energy discussed in the text is atomic energy.

Q11: Name three alternative sources of energy.
Ans: Three alternative sources of energy are wind energy, solar energy, and hydrological energy.

Q12: What is used to produce electricity from wind energy?
Ans: Windmills are used to produce electricity from wind energy.

Q13: What can solar energy be used for?
Ans: Solar energy can be used for cooking, heating, and producing electricity.

Q14: Are wind and solar energy currently cost-effective?
Ans: No, wind and solar energy are not currently cost-effective.

Q15: What type of energy is generated by burning wood or coal?
Ans: Burning wood or coal generates steam energy.