Sets
Physics Set 27
26 questions 1. Danger signal lights are red because red light is:
2. A lifting electromagnet releases the iron objects when the current through it is:
3. The SI base unit of luminous intensity is:
4. The SI unit of specific heat capacity is:
5. An electron moves from one shell to another by absorbing or releasing energy equal to the:
6. The relative density of a metal is 2.7. Its density in kg m⁻³ is:
7. A sonic boom is produced when an aircraft flies at a speed:
8. The defect of vision caused by the gradual weakening of the ciliary muscles and diminishing flexibility of the eye lens with age is:
9. A particle in SHM has spring constant 100 N m⁻¹ and amplitude 0.1 m. Its total energy is:
10. A current carrying coil that behaves as a magnet is called:
11. A combination of two or more cells, with the positive terminal of one connected to the negative terminal of the next, is called a:
12. Which of the following is a greenhouse gas?
13. Which of the following is a poor conductor of heat?
14. A ray of light passing through the centre of curvature of a concave mirror, after reflection, is:
15. In June, the season in the Southern Hemisphere is:
16. The relative charges of the electron, proton and neutron respectively are:
17. The discovery in 1820 that an electric current produces a magnetic field was made by:
18. The most abundant gas in the Earth's atmosphere is:
19. A convex mirror has a focal length of +15 cm. An object is placed 30 cm in front of it. The magnification produced is:
20. At the time of a short circuit, the current in the circuit: