MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
CBSE
Class 12 Physics
Nuclei
Quiz 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
How many electrons are contained in \(_{92}^{238}\)U nucleus?
0%
92
0%
146
0%
238
0%
0
Explanation
0
Chadwick was awarded the Nobel prize in Physics in 1935 for his discovery of:
0%
electron
0%
proton
0%
neutron
0%
None of these
Explanation
neutron
The density of a nucleus is of the order of:
0%
10
15
kg m
-3
0%
10
18
kg m
-3
0%
10
17
kg m
-3
0%
10
16
kg m
-3
Explanation
10
17
kg m
-3
When the mass of a sample of a radioactive substance decreases, the mean life of the sample:
0%
increases
0%
decreases
0%
remain unchanged
0%
first decreases then increases
Explanation
remain unchanged
Alpha particle emitted from a radioactive material are:
0%
Helium nuclei
0%
Hydrogen nuclei
0%
Lithium nuclei
0%
None of the above
Explanation
Helium nuclei
The half life of a radioactive decay is n times its mean life, n is equal to:
0%
0.6930
0%
0.0693
0%
\(\frac{1}{0.6930}\)
0%
0.3070
Explanation
0.6930
Rutherford is the unit of:
0%
radioactivity
0%
energy
0%
photoelectric current
0%
magnetic field
Explanation
radioactivity
According to Yukawa's theory of nuclear forces, the origin of nuclear force between nucleons is due to the exchange of
0%
mesons
0%
photons
0%
electrons
0%
positrons
Explanation
photons
An electron and a positron each having a mass equivalent to 0.53 MeV annihilate each other and produce a photon. The minimum energy of the photon is.
0%
0.53 MeV
0%
1.06 MeV
0%
2.12 MeV
0%
zero
Explanation
1.06 MeV
The wavelength of y-rays is of the order of:
0%
10
-8
m
0%
10
-5
m
0%
10
-11
m
0%
10
-22
m
Explanation
10
-11
m
Radius of 1st Bohr orbit is a
0
(= 0.529 Å) What is the radius of 2nd Bohr orbit?
0%
10
-8
0%
2a
0
0%
4a
0
0%
2√2a
0
Explanation
4a
0
The ground state energy of Hydrogen atom is -6 eV. What is the potential energy of electron in this state?
0%
0 eV
0%
-13.6 eV
0%
2 eV
0%
-27.2 eV
Explanation
-27.2 eV
Which of the following atoms has the lowest ionization potential?
0%
\(_{8}^{8}\)O
0%
\(_{7}^{14}\)N
0%
\(_{55}^{133}\)Cs
0%
\(_{18}^{40}\)Ar
Explanation
\(_{55}^{133}\)Cs
The Bohr model of atom:
0%
assumes that the angular momentum of electron is quantized
0%
uses Einstein's photoelectric equation
0%
predicts continuous emission spectra for atoms
0%
predicts the same emission spectra for all types of atoms
Explanation
assumes that the angular momentum of electron is quantized
Nuclear force is:
0%
strong, short range and charge independent force
0%
charge independent, attractive and long range force
0%
strong, charge dependent and short range attractive force
0%
long range, change dependent and attractive force
Explanation
strong, short range and charge independent force
If radio active nuclei emits β-particle, then mass-number:
0%
increased by 1 unit
0%
decreases by 1 unit
0%
increases by 2 unit
0%
decreases by 2 unit
Explanation
increased by 1 unit
An alpha particle is emitted from \(_{88}\)Ra\(^{226}\), then the product nuclei has:
0%
Z = 84, A = 224
0%
Z = 86, A = 224
0%
Z = 86, A = 222
0%
Z = 82, A = 222
Explanation
Z = 86, A = 222
X-ray was discovered by :
0%
Becqueral
0%
Marie curie
0%
Roengton
0%
Vanlaw
Explanation
Roengton
Fusion takes place at high temperature because:
0%
Atom are ionised at high temperature
0%
Molecules break up at high temperature
0%
Nuclei break up at high temp.
0%
Kinetic energy is high enough to overcome repulsion between nuclei
Explanation
Kinetic energy is high enough to overcome repulsion between nuclei
The order of nuclear density is :
0%
10
3
0%
10
17
0%
10
6
0%
None
Explanation
10
17
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0
Answered
0
Not Answered
0
Not Visited
Correct : 0
Incorrect : 0
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page