Questions (125)
Q1CAPF2021
The time elapsed between viewing a lightning flash and hearing the thunder of a cloud is 10 s. If the speeds of sound and light in air are 330 m/s and 3×10^8 m/s respectively, how far away is the storm?
- A About 1650 m
- B About 3300 m ✓
- C About 990 m
- D About 1000 m
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
Q2CAPF2021
What is the approximate wavelength of violet light in air?
- A 0·7 μm
- B 0·6 μm
- C 0·5 μm
- D 0·4 μm ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
Q3CAPF2021
Which electromagnetic radiation(s) is/are used to cook food?
- A Infrared radiation only
- B Microwave radiation only
- C Infrared and microwave radiations ✓
- D All electromagnetic radiations
✓ Correct answer: (C)
Science & Technology › Physics & Chemistry
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