1. The quantum of electromagnetic radiation is called
2. When an object is placed between two parallel mirrors, the number of images fomed will be
Infinite
3. The pitch of a sound is determined by its
Wave length
4. What do we call a substance which is repelled?
Diamagnetic
5. The energy required to remove an electron from an atom is called the……….
Ionization energy
6. A system of two equal and opposite parallel forces is called………
Couple
7. Ice skating is possible because of the phenomenon of
Regulation
8. Nuclear force is communicated from one nucleon to another via a particle called………
Momenyum
9. Bending of light beams around the corner of an obstacle is called…………
Diffusion
10. One coulomb charge is
6.25x1018 electrons
11. The space surrounding a magnet in which magnetic force is exerted is called………..
Magnetic field
12. Fleming’s left-hand rule is applicable to
Motor
13. Lenz’s law states that the induced current
Opposes the motion
14. What is the number of neutral points for a bar magnet with its north pole pointing geographical north?
Two
15. Radar System uses
Electromagnetic waves
16. With rise in temperature, the speed of sound
Increases
17. A quantity that has both magnitude and direction is called………..
A vector
18. ……….is the ratio of viscosity forces to pressure forces in a fluid flow.
Reynolds number
19. In Newton ’s third law, the action and reaction forces;
Act on different bodise
20. What is ‘Black Hole’?
A dying star
21. Which of the following parts of the sunlight makes the solar cooker hot?
Infrared
22. Who is the inventor of X-ray tube?
Coolidge
23. In a Diesel engine ignition is caused through:
Compression
24. The terminal colours of the rainbow are:
Violet and red
25. The mid point of lens is called………..
Optic centre
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