IB DP Physics Topic 8 Paper 1 2019

What is the phenomenon that best explains why greenhouse gases absorb infrared radiation?

• A. Resonance

• B. Interference

• C. Refraction

• D. Diffraction

In which of the following places will the albedo be greatest?

• A. A forest

• B. A grassland

• C. An ocean

• D. A polar ice cap

A wind turbine produces a power P when the wind speed is v. Assuming that the efficiency of the turbine is constant, the best estimate for the power produced when the wind speed becomes 2v is

• 2P

• 4P

• 6P

• 8P

A spherical black body has absolute temperature T₁. The surroundings are kept at a lower absolute temperature T₂. What is the net power per unit area lost by the body?

• A. σT₁⁴

• B. σT₂⁴

• C. σ(T₁⁴ - T₂⁴)

• D. σ(T₁⁴ + T₂⁴)

The design of a nuclear power station includes an electrical generator. The function of the generator is to convert

• A. nuclear energy to kinetic energy.

• B. kinetic energy to thermal energy.

• C. thermal energy to electrical energy.

• D. kinetic energy to electrical energy.

Which of the following fuels has the highest energy density?

• A. Coal

• B. Gas

• C. Oil

• D. Uranium

Which of the following correctly describes both the role of the moderator and of the control rods in a nuclear reactor?

• A

• B

• C

• D

Which of the following correctly shows the energy change in a photovoltaic cell and in a solar heating panel?

• A

• B

• C

• D

Which of the following is the most likely explanation for a rise in global sea level?

• A. Thermal expansion of water

• B. Melting of sea ice

• C. Increase in rainfall

• D. Thermal expansion of ice

Greenhouse gases

• A. reflect infrared radiation but absorb ultraviolet radiation.

• B. reflect ultraviolet radiation but absorb infrared radiation.

• C. transmit infrared radiation but absorb ultraviolet radiation.

• D. transmit ultraviolet radiation but absorb infrared radiation.