CSAT Suneung · Physics I
Electricity, waves and modern physics
12 practice questions, each with the answer and an explanation.
Practise Electricity, waves and modern physics now
Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.
All 12 questions
- A 12 V battery is connected across a 4 ohm resistor and a 2 ohm resistor in series. What is the current?
- A 6 ohm and a 3 ohm resistor are connected in parallel across a 6 V supply. What is the total current?
- An appliance rated 1500 W is switched on for 2 hours. How much energy does it use in kWh?
- A wave on a string has a frequency of 5 Hz and a wavelength of 0.4 m. What is its speed?
- A sound wave has a speed of 340 m/s and a frequency of 170 Hz. What is its wavelength?
- Which colour of visible light has the highest frequency?
- A convex lens of focal length 10 cm forms an image of an object placed 30 cm from the lens. How far from the lens is the image?
- The photoelectric effect shows that light behaves as
- The energy of a photon is given by E = hf. If the frequency is doubled, the energy
- In a nuclear fission reaction, a heavy nucleus splits into smaller nuclei and releases energy because
- A radioactive isotope has a half-life of 3 days. What fraction of the sample is left after 9 days?
- Which of these is a transverse wave?
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