Heavy water is used as moderator a?nuclear reactor. The function of the moderator is
1). to control the energy released in the reactor
2). to absorb neutrons and stop the chain?reaction
3). ?to cool the reactor
4). to slow down the neutrons to thermal energy
The least penetrating power ray is
1). $alpha$ Ray
2). ?X ? Ray?
3). $gamma$ Ray
4). $beta$ Ray
?Particle which can be added to the nucleus of an atom without changing its chemical properties are
1). Electrons
2). protons
3). Neutrons
4). $alpha$ -particles
he mass number of an atom is determined by-
1). Adding the number of neutrons and number of electrons
2). Adding the number of protons and?number of electrons
3). The number of protons only
4). Adding the number of neutrons and number of protons
Who invented the battery?
1). Volta
2). Roentgen
3). Faraday
4). Maxwell?