أسئلة عن الطاقة والضوء

What is the significance of the average surface temperature of the Earth being 15 degrees Celsius?

• It helps water evaporate quickly

• It provides a suitable environment for living organisms

• It leads to the freezing of oceans

• It increases volcanic activity

What percentage of fossil fuel consumption was from total energy sources in 2011?

• 50%

• 60%

• 80%

• 90%

Why do industrial cities consume more fossil fuel than developing cities?

• Because they have more factories

• Due to a lower population

• Because of the presence of renewable energy stations

• Due to reliance on clean energy sources

Solar heaters use solar energy in a way that is:

• Direct

• Indirect

• Only thermal

• Chemical

Which of the following factors hinders the use of solar cells for electricity production?

• High production costs

• Availability of nuclear energy

• Insufficient sunlight in all countries

• All of the above

What is the definition of the angle of incidence?

• The angle between the incident ray and the reflective surface

• The angle between the incident ray and the perpendicular to the reflective surface

• The angle between the reflected ray and the reflective surface

• The angle between the reflected ray and the perpendicular

In flat mirrors, the formed image is:

• Real and inverted

• Real and upright

• Virtual and inverted

• Virtual and upright

When the object is in front of a convex lens at a distance greater than twice the focal length, the image is:

• Real and inverted

• Virtual and upright

• Real and upright

• Very small

Which of the following factors affects the focal length of a convex lens?

• Thickness of the lens

• Material of the lens

• Radius of curvature of the surfaces

• All of the above

What is the unit of electric current intensity?

• Volt

• Ampere

• Ohm

• Watt