Grade 10 Physics · Strand 1: Mechanics and Thermal Physics · Introduction to Physics
Modern Branches of Physics
A short Grade 10 Physics lesson for the CBE curriculum, part of Mechanics and Thermal Physics: Introduction to Physics. Learn it on any phone with notes and slides, then check yourself with a quick quiz and earn XP. This lesson is free.
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5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.
1. Metal railway tracks have small gaps called expansion joints so that they do not buckle on hot sunny days. Which branch of physics explains this?
- A. Thermodynamics (thermal expansion)
- B. Geometrical optics
- C. Electrostatics
- D. Astrophysics
2. An ambulance siren sounds higher in pitch as it approaches you and lower after it passes. What is this effect called?
- A. Resonance
- B. Doppler effect
- C. Refraction
- D. Diffraction
3. According to energy band theory, why do insulators such as rubber not conduct electricity under ordinary conditions?
- A. Their valence and conduction bands overlap
- B. They have a wide forbidden energy gap that valence electrons cannot cross
- C. They have a narrow energy gap that thermal energy easily crosses
- D. They contain too many free electrons
4. A radioactive sample has a mass of 80 g of undecayed nuclei. Its half-life is 6 hours. What mass of the sample remains undecayed after 18 hours?
Type your answer (in g) in the lesson.
5. In a stationary wave, what name is given to the points of zero disturbance?
Type your answer in the lesson.
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