Unit 1 Physics Revision Paper MCQ

A cold metal spoon is placed into a mug of hot coffee. What is the direction of thermal energy transfer?

• From spoon to coffee

• From coffee to spoon

• No heat transfer occurs

• Both transfer energy equally

Which of the following is not part of the electromagnetic spectrum?

• Infrared radiation

• X-rays

• Alpha particles

• Microwaves

A star has a peak wavelength of 580 nm. What is its approximate surface temperature?

• 500 K

• 3000 K

• 5000 K

• 10,000 K

A 1.5 kg block of water starts at 25°C. If 188 kJ of energy is added with no loss, what is the final temperature?

• 100 K

• 20°C

• 200 K

• 323 K

In which method of heat transfer do particles move carrying energy with them?

• Radiation

• Convection

• Conduction

• Emission

A distant star emits most of its radiation at 610 nm. What region of the spectrum does this wavelength belong to?

• Infrared

• Ultraviolet

• Visible light

• Gamma rays

A distant star emits most of its radiation at 610 nm. Using Wien’s Law, what is the star’s surface temperature?

• 4000 K

• 5000 K

• 6000 K

• 7000 K

A cooler star emits a peak at 1200 nm. Which part of the spectrum is this?

• X-ray

• Ultraviolet

• Infrared

• Gamma Rays

As light enters glass from air, what happens to its speed and wavelength?

• Both increase

• Both decrease

• Speed decreases, wavelength decreases

• Speed decreases, wavelength increases

What are the products when thorium-232 undergoes alpha decay?

• Radium-228 and helium-4

• Uranium-234 and helium-2

• Protactinium-231 and helium-4

• Radon-230 and helium-2