Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 36

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Weekly Quiz Competition

Question 1
4 / -1

If the atom ₁₀₀Fm²⁵⁷ follows the Bohr model and the radius of ₁₀₀Fm²⁵⁷ is n times the Bohr’s radius, then find n.

A
100

B
200

C
4

D

Solution
Question 2
4 / -1

For uranium nucleus, how does its mass vary with volume?

A
m ∝ V

B

C

D
m ∝ V²
Question 3
4 / -1

A nucleus with mass number 220 initially at rest, emits an alpha particle. If the Q value of the reaction is 5.5 MeV, calculate the K.E. of the α particle.

A
4.4 MeV

B
5.4 MeV

C
5.6 MeV

D
6.5 MeV

Solution
Question 4
4 / -1

The nuclei of which one of the following pairs of nuclei are isotones?

A

B

C

D
Question 5
4 / -1

Fission of nuclei is possible because the binding energy per nucleon in them

A
decreases with mass number at low mass numbers

B
increases with mass number at low mass numbers

C
decreases with mass number at high mass numbers

D
Increase with mass number at high mass numbers.
Question 6
4 / -1

The total energy of an electron in the first excited state of hydrogen atom is about – 3.4 eV. Its kinetic energy in this state is:

A
-6.8 eV

B
3.4 eV

C
6.8 eV

D
-3.4 eV
Question 7
4 / -1

Starting with a sample of pure ⁶⁶Cu, 7/8 of it decays into Zn in 15 minutes. The corresponding half-life is

A

B
5 minutes

C
15 minutes

D
10 minutes

Solution
Question 8
4 / -1

A
5 fermi

B
4 fermi

C
8 fermi

D
6 fermi

Solution
Question 9
4 / -1

Fig. shows the energy levels for an electron in a certain atom. Which transition shown represents the emission of a photon with the most energy?

A
II

B
I

C
IV

D
III

Solution
Question 10
4 / -1

If a star can convert all the He nuclei completely into oxygen nuclei, the energy released per oxygen nucleus is [Mass of He nucleus is 4.0026 amu and mass of oxygen nucleus is 15.9994 amu]

A
7.6 MeV

B
56.12 MeV

C
10.24 MeV

D
23.9 MeV

Solution