Physics Questions Part - 2

1. What is the name of the scientist who stated that matter can be converted into energy?
Einstein

2. Einstein’s mass energy relation is given by which expression?
E = mc2

3. What type of farming is practised in the densely populated regions of the world?
Intensive farming

4. By which fission does Leishmania, the causative agent of kala-azar, multiply a sexually?
By binary fission

5. The filament of an electric bulb is made of which metal?
Tungsten

6. If the temperature inside a room is increased, what will be the relative humidity?
Decrease
7. Which proper order of seismic waves as they are received at seismograph station?
P-wave, S-wave, Lwave

8. What is the relative permeability of a paramagnetic material?
Greater than unity

9. On planet Earth, where is no centrifugal force?
At the Poles
10. By whom was Electron first identified?
J. J. Thomson

11. How must be the The lines of force of a uniform magnetic field?
Parallel to each other

12. When a ray of light is going from one medium to another, how is its frequency changes?
Frequency remains same

13. Heat given to an ideal gas under isothermal conditions is used in which work?
In doing external work

14. When will a hot body radiate maximum energy?
If its surface is black and rough

15. A far-sighted person has a near point at 100 cm. What must be the power of the correcting lens?
+3.0 D

16. How many image can a man see if he stands between two plane mirrors inclined at an angle of 60°?
5

17. Which rays can pass through 20 cm thickness of steel?
Alfa-rays

18. Mesons are found in which rays?
Cosmic rays

19. Why can Insects move on the surface of water without sinking?
Due to Surface tension of water

20. According to Dalton’s atomic theory, which is the smallest particle which can exist independently?
An atom

21. Who firstly predicated the existence of electromagnetic waves?
Maxwell

22. The intensity of a magnetic field is defined as the force experienced by which pole?

Unit north pole

23. In which process, a nucleus spontaneously breaks down by emitting radiation?
Radioactive decay
24. Fluorescent tubes are fitted with a choke. What does the choke coil?
Reduces current in the circuit

25. For television broadcasting, what frequency is employed normally?
30 – 300 MHz

26. Which effect shows particle nature of light?
Photoelectric effect

27. Activated charcoal is employed to remove colouring matter from pure substance, it work?
Adsorption

28. Optic fibres are mainly used for which purpose?
Communication

29. Which rays are most penetrating?
Gamma-rays

30. Which common devices works on the basis of the principle of mutual induction?
Transformer