What is the SI unit for energy?

• Joule
• Watt
• Newton
• Calorie

The law of conservation of energy states that energy can be created and destroyed.

• True
• False

Which of the following is a non-commercial energy source?

• Firewood

• Petroleum
• Natural Gas

• Electricity

A household uses 9,000 kJ of energy from gas and 12.5 kWh of electricity every day. What is the total daily energy consumption of the house in kWh?

• 11.5 kWh

• 14.0 kWh

• 15.0 kWh

• 21.5 kWh

Which prefix represents 10^-6?

• Nano
• Mega

• Milli
• Micro

Which of the following is a secondary energy source?

• Coal
• Wind
• Diesel
• Biomass

Which statement is correct about renewable energy?

• They are finite
• Cause significant pollution
• Self-replenishing
• Cannot be used

Energy conversion in hydro power plant?

• Electrical → Mechanical → Kinetic
• Potential → Kinetic → Mechanical → Electrical
• Mechanical → Thermal → Electrical
• Kinetic → Electrical → Mechanical

Q: What is the main advantage of evacuated tube solar collectors compared to flat plate collectors?

• They are cheaper to install

• They work better in cold climates by reducing heat loss

• They require sunlight only during the night

• They are mostly used for cooking

Crude Oil is classified as?

• Non-Renewable

• Renewable

• Green
• Secondary