PHYSICS I

11. Arrange in descending order of wave length (long to short)

I. Infra – red II) Ultra violet III. Gamma rays IV) Micro waves The correct order is

a) IV, I, II III b) I, IV, II, III c) I, II, III, IV d) III, II, I, IV

12. Electromagnetic radiation are given out due to

a. jumping of electrons from low energy to high level energy

b. jumping of electrons from high energy to low level energy

c. Revolution of electrons in specified orbits

d. None of these

13. In general, when the temperature of a metal is raised, its conductance

a) increases b) decreases c) remains the same d) first decreases then increases

14. Which falls down fastest in vacuum, a feather, a wooden ballor a steel ball?

a) wooden ball b) feather c) steel ball d) all will fall down at the same speed

15. Reed instrument without pipe is

a) Trumpet b) Harmonium c) Flute d) Nathaswaram

16. If sound persists even after its source has stopped producing sound, then its called

a) forced vibration b) free vibration c) resonance d) reverberation

17. The velocity of a freely falling body

a) decreases b) increases c) remains constant d) may increase or may decrease

18. Nodes are

a. Positions of maximum displacement

b. Positions of no displacement

c. A position between no displacement and maximum displacement

d. None of these

19. The process in which heat is transmitted without the aid of the intervening medium is

a) conduction b) convection c) radiation d) none of these

20. For the measurement of very low temperature we use

a. mercury thermometer

b. vapour pressure thermometer

c. resistance thermometer

d. radiation thermometer