Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 69

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Weekly Quiz Competition

Question 1
4 / -1

If the series limit of Lymen series for Hydrogen atom is equal to the series limit of Balmer series for a hydrogen like atom, then atomic number of this hydrogen like atom will be

A
1

B
2

C
3

D
4

Solution
Question 2
4 / -1

Two protons are kept at a separation of 40Å. F_n is the nuclear force and F_e is the electrostatic force between them. Then,

A
F_n >> F_e

B
F_n = F_e

C
F_n << F_e

D
F_n ≈ F_e

Solution
Question 3
4 / -1

When a hydrogen atom is bombarded, the atom is exicted to the n = 4 state. The energy released, when the atom goes from n = 4 state to the ground state is

A
1.275 eV

B
12.75 eV

C
5 eV

D
8 eV

Solution
Question 4
4 / -1

The Fig. indicates the energy levels of a certain atom. When the system moves from 2 E level to E, a photon of wavelength λ is emitted. The wavelength of photon produced during its transition from 4E/3 level to E is

A

B

C

D
Question 5
4 / -1

The nucleus at rest disintegrate into two nuclear parts which have their velocities in the ratio 2 : 1 The ratio of their nuclar sizes will be

A

B

C

D

Solution
Question 6
4 / -1

In each of the following question match column -I and `column -II select correct

A
a → s, b → r, c → q, d → p

B
a → r, b → p, c → q, d → s

C
a → p, b → r, c → s, d → q

D
b → p, c → q, b → r, d → s
Question 7
4 / -1

Assertion :- In a radio-active disintegration, an election is emitted by nucleus.
Reason :- eleccon are always Present in-side the nucleus.

A
Both assertion and reason are true. Reason is the correct explanation of the Assertion

B
Both assertion and reason are true. Reason is not correct explanation of the assertion

C
Assertion is true but reason is false.

D
Both Assertion and Reason are false
Question 8
4 / -1

Assertion :- An election and Positon can annibilate each other creating Photon.
Reason :- Electon and Positon form a Particle and anti Particle.

A
Both assertion and reason are true. Reason is the correct explanation of the Assertion

B
Both assertion and reason are true. Reason is not correct explanation of the assertion

C
Assertion is true but reason is false.

D
Both Assertion and Reason are false
Question 9
4 / -1

Assetion :- An isolated radioactive atom may not decay at all what ever be its half time
Reason :- Radioactive decay is a statistical Phenomena.

A
Both Assertion and reason are true. Reason is the correct explanation of the Assertion

B
Both Assertion and reason are true. Reason is not correct explanation of the Assertion

C
Assertion is true but reason is false.

D
Both Assertion and Reason are false
Question 10
4 / -1

Assertion :- Fragment Produced in the fission of u235 are active Reason :- The fragments have abnormally high Proton to neutron ratio

A
Both assertion and reason are true. Reason is the correct explanation of the Assertion

B
Both assertion and reason are true. Reason is not correct explanation of the assertion

C
Assertion is true but reason is false

D
Both Assertion and Reason are false