In an atomic nucleus, neutrons and protons are held together by:
A). Gravitational forces
B). Exchange forces
C). Coulombic forces
D). Magnetic forces
1. The wire of flash bulb is made of:
3. Which of the following is used in oven ?
4. Impure camphor is purified by
5. Table salt gets moist during rainy season because
6. Which one of the following elements is least likely to be found in commercial fertilisers?
8. Which of the following was to be discovered first in the chromospheres of the sun?
9. Light year is a measurement of
10. The cells constituting walls of the blood capillaries are known as