Sets
Physics Set 21
30 questions 1. High-speed winds are accompanied by:
2. A pendulum bob completes 90 oscillations in one minute. Its time period is:
3. The area enclosed by a velocity-time graph and the time axis gives:
4. A sound wave in air has a frequency of 500 Hz and a wavelength of 0.68 m. Its speed is:
5. Most bats locate prey in the dark by emitting short bursts of:
6. A particle in SHM has amplitude 0.2 m and angular frequency 5 rad s⁻¹. Its maximum speed is:
7. Which of the following helps reduce reverberation in an auditorium?
8. Venus is hotter than Mercury, although farther from the Sun, because of:
9. Water has its maximum density at:
10. Canal rays discovered in a modified cathode ray tube consist of:
11. Consider the following pairs:
(I) Live wire – Red insulation
(II) Neutral wire – Black insulation
(III) Earth wire – Red insulation
Which of the pairs given above is/are correctly matched?
12. According to Joule's law of heating, the heat H produced in a resistor R carrying a steady current I for time t is:
13. Which of the following is a scalar quantity?
14. The gold foil experiment was carried out by Geiger and Marsden, under Rutherford, in:
15. The minimum time gap between two sounds for them to be heard as separate sounds is:
16. Consider the following pairs:
(I) α-rays – Positively charged particles
(II) β-rays – Negatively charged particles similar to electrons
(III) γ-rays – Stream of positively charged particles
Which of the pairs given above is/are correctly matched?
17. The force exerted by a fluid at rest on a surface in contact with it is always:
18. Aryabhata's stated time for one full rotation of the Earth about its axis is about:
19. The poles of an electromagnet can be reversed by changing the:
20. A satellite orbits a planet at a radius R with time period T. Another satellite orbits the same planet at a radius 4R. Its time period is: