51.
What is the range of Strong Nuclear force?

52.
Name the process of production of energy in the Sun

53.
Which type of reaction produces the most harmful radiation ?

54.
Energy is continuously created in the sun due to:

55.
The mass defect is the result of what action occurring?

56.
Which one of the following wavelengths of light is most effective in photosynthesis ?

57.
The optical phenomenon that is primarily responsible for the observation of rainbow on a rainy day is

58.
An electron microscope gives higher magnification than an optical microscope, because :

59.
The magnifying power of an astronomical telescope can be decreased by

60.
The light rays used for eliminating bacteria is