1 |
How many isotopes of helium are present? |
1
2
3
4
|
2 |
The number of isotopes of hydrogen are |
2
1
3
4
|
3 |
Nuclei that have the same charge number but different mass number are called |
isotones
isomers
isotopes
isobars
|
4 |
Electrons are |
positive charged
negatively charged
massless
neutral
|
5 |
Neutrons are |
positive charge
negatively charged
massless
neutral
|
6 |
The diameter of an atom is of the order |
10<sup>-125</sup>m
10<sup>-11</sup>m
10<sup>-10</sup>m
10<sup>-9</sup>m
|
7 |
Structure of the nucleus was explained by |
J.J Thomson
Bohr
Millikan
Rutherford
|
8 |
Charge on proton is |
1.59 x 10<sup>-9</sup>C
1.59 x 10<sup>-7</sup>C
-1.59 x 10<sup>-19 </sup>C
1.59 x 10<sup>-19</sup>C
|
9 |
Mass of proton is of order of |
10<sup>-31</sup>gm
10<sup>-27</sup>kg
10<sup>-24</sup>gm
10<sup>+27</sup>kg
|
10 |
The number if neutrons in the nucleus of 92U235are |
Infinite
92
235
143
|
11 |
For an atom having atomic number Z and atomic weight A, the number of electron in an atoms |
A - Z
A + Z
Z
A
|
12 |
For an atom having atomic number Z and atomic weight A, the charge on the nucleus is |
A - Z
A + Z
Z
A
|
13 |
The number of all the protons and neutrons in a nucleus is known as |
atomic number
mass number
charge number
none of these
|
14 |
The number of protons inside a nucleus is called |
mass number
atomic weight
atomic number
none of these
|
15 |
The total charge of any nucleus is given as |
Ze<sup>2</sup>
Z<sup>2</sup>e
Z/e
Ze
|
16 |
The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains |
3 more neutrons
3 more electrons
3 more protons
3 more ions
|
17 |
For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is |
A - Z
A
Z
A + Z
|
18 |
According to Rutherford atomic model, the positive charge in an atom |
is concentrated at its centre
is in the form of positive electron at same distance from its centre
is spread uniformly through its volume
none of these
|
19 |
The chemical behaviour of an atom is determined by |
binding energy
atomic number
mass number
number of isotopes
|
20 |
1 amu is equal to |
1.66 x 10<sup>-24</sup>kg
1.66 x 10<sup>-19</sup>kg
1.66 x 10<sup>-34</sup>kg
1.66 x 10<sup>-27</sup>kg
|
21 |
Mass of proton is |
1.67 x 10<sup>-27</sup>kg
1.67 x 10<sup>-31</sup>kg
1.66 x 10<sup>-34</sup>kg
1.67 x 10<sup>-17</sup>kg
|
22 |
Mass of neutron is |
1.67 x 10<sup>-31</sup>kg
1.67 x 10<sup>-27</sup>kg
9.1 x 10<sup>-31</sup>kg
1.67 x 10<sup>-</sup>19kg
|
23 |
Nucleus consists of |
proton and neutron
protons and electron
electron and neutron
protons only
|
24 |
A particle having the mass of electron and charge of a proton is called a |
photon
position
antiproton
antineutrino
|
25 |
Charge on neutron is |
1.6 x 10<sup>-19</sup>C
zero
-1.6 x 10<sup>-19</sup>C
1.2 x 10<sup>-19</sup>C
|
26 |
In 1932 Chadwick discovered |
proton
neutron
photon
electron
|
27 |
Neutron was discovered by |
Curie
Roentgen
Chadwick
Rutherford
|
28 |
Neutron was discovered in |
1915
1920
1925
1932
|
29 |
Proton was discovered by Rutherford in |
1915
1906
1910
1920
|
30 |
According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the |
number of photoelectrons
size of the photoelectrons
charge on photoelectrons
K.E of photoelectrons
|