Mechanical Nuclear Power Plant

Test Preparation on Mechanical Nuclear Power Plant

1.

The efficiency of a nuclear power plant in comparsion to a conventional

1same
2more
3less
4may be less or mote depending on size
5unpredictable.

2.

Isotopes of same elements have

1same atomic number and different masses
2same chemical properties but different atomic numbers
3different masses and different atomic numbers
4different chemical properties and same atomic numbers
5same chemical properties and same atomic numbers.

3.

Atomic number of an element in the periodic table represents the number

1protons in the nucleus
2electrons in me nucleus
3neutrons in the nucleus
4electrons in the atom
5neutrons in the atom.

4.

The mass number of a substance represents the sum of total number of

1protons and neutrons in an atom
2protons and electrons in an atom
3neutrons and electrons in an atom
4protons and neutrons in a nucleus
5protons and electrons in a nucleus.

5.

Which is not identical for an atom and an isotope

1mass number
2atomic number
3chemical properties
4position in periodic table
5all of the above.

6.

Amongst the following, the fissionable materials are

1U233andPu239
2U23iandPu233
3U235andPu235
4U238andPu239
5U243andPu235

7.

A nuclear unit becoming critical means

1it is generating power to rated capacity
2it is capable of generating much more than rated capacity
3there is danger of nuclear spread
4chain reaction that causes automatic splitting of the fuel nuclei has been established
5it generates no heat.

8.

Moderator in nuclear plants is used to

1reduce temperature
2extract heat from nuclear reaction
3control the reaction
4cause collision with the fast moving neutrons to reduce their speed
5moderate the radioactive pollution.

9.

The most commonly used moderator in nuclear plants is

1heavy water
2concrete and bricks
3graphite and concrete
4deutrium
5graphite.

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