Radioactivity

Question 1

3 main particles of an atom

Answer 1

Electron ,Proton, Neutron

Question 2

Electrons have_______ orbits

Answer 2

Stationary

Question 3

No.of shells in an atom depends on

Answer 3

Total number of electrons in it

Question 4

What is the centre of an atom

Answer 4

nucleus

Question 5

At.no of an atom is equal to the

Answer 5

Protons in its nucleus

Question 6

Mass number of an atom is equal to the?

Answer 6

total no of nucleons

Question 7

Atoms of the same element having same atomic number but different mass number

Answer 7

Isotopes

Question 8

Isoptopes have same______ but different________

Answer 8

atomic number,mass number

Question 9

____ has the largest number of isotopes

Answer 9

Tin

Question 10

Atom of different element have same mass no but different atomic number

Answer 10

Isobars

Question 11

Isobars are_____element having______mass number but ___________atomic number

Answer 11

different,same,different

Question 12

What are mirror isobars?

Answer 12

If the no of protons and neutrons get interchanged then, they are called mirror isobars

Question 13

Atoms having different no of protons but same neutrons

Answer 13

isotones

Question 14

Positive charged particles

Answer 14

alpha

Question 15

-ve charged particles

Answer 15

beta

Question 16

uncharged particles

Answer 16

gamma

Question 17

Radioactive elements

Answer 17

the substances which decay by the spontaneous emission of radiation

Question 18

Natural radioactive substances

Answer 18

When the number of neutrons is much more than the number of protons

Question 19

Radioactivity is a __________phenomenon

Answer 19

Nuclear

Question 20

Radioactive decay is a __________phenomenon

Answer 20

random

Question 21

beta particles deviate ______than alpha particles

Answer 21

more

Question 22

Mass of an apha particle is roughly

Answer 22

4 times the mass of proton

Question 23

Speed of alpha particle

Answer 23

10^7 ms-1

Question 24

Alpha particles _____________ a photographic plate

Answer 24

Affect

Question 25

Speed of beta particle

Answer 25

10^8 ms-1

Question 26

Betta particles____________ a photographic plate

Answer 26

Affect

Question 27

Speed of gamma particles

Answer 27

same as speed of light i.e 3*10^8 m s-1

Question 28

Gamma radations have___________ionising power but_______penetrating power

Answer 28

least, maximum

Question 29

Alpha radations have___________ionising power but_______penetrating power

Answer 29

maximum, least

Question 30

1 a.m.u=

Answer 30

931MeV

Question 31

What is nuclear fission?

Answer 31

The process in which a heavy nuclei is split into two smaller nuclei of nearly the same size,when bombared with slow neutrons.

Question 32

Nuclear bomb is based on what kind of a chained reaction?

Answer 32

Uncontrolled

Question 33

2 use of fission

Answer 33

1) Destructive-nuclear bomb 2) Constructive-electric power

Question 34

Nuclear fission ____ be control

Answer 34

can

Question 35

Necular fusion

Answer 35

2 light nuclei combine to form a heavy nuclie

Question 36

Nuclear fusion is not possible under what temperature and pressure?

Answer 36

Ordinary

Question 37

What is the fusion reaction also called as?

Answer 37

thermo-nuclear reaction.

Question 38

Nuclear fission reaction is possible at what temperature and pressure

Answer 38

ordinary

Question 39

1 fission reaction________ energy is released

Answer 39

190MeV

Question 40

1 fusion reaction ____________ energy is released

Answer 40

24.7MeV

Question 41

The fissionable substance is

Answer 41

radioactive

Question 42

Fission process can be________

Answer 42

Controlled

Question 43

Nuclear bomb is based on_______-

Answer 43

Uncontrollable fission reaction

Question 44

Hydrogen bomb is based on

Answer 44

Uncontrollable fusion reaction

Question 45

Uncontrollable fission reaction give what kind of a bomb?

Answer 45

Nuclear

Question 46

Uncontrollable fusion reaction give what kind of a bomb?

Answer 46

Hydrogen

Question 47

What is the simailarty in fission and fusion

Answer 47

Release of energy due to loss in mass.

Question 48

In each fission reaction the_____ remains conserved

Answer 48

mass and atomic number

Question 49

Moderators in nuclear reactor

Answer 49

Graphite and Heavy water