Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 40

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Weekly Quiz Competition

Question 1
4 / -1

The ratio of the kinetic energy to the total energy of an electron in a Bohr orbit is

A
–1

B
2

C
1 : 2

D
None of these

Solution
Question 2
4 / -1

If an electron jumps from 1st orbital to 3rd orbital, then it will

A
Absorb energy

B
Release energy

C
No gain of energy

D
None of the above
Question 3
4 / -1

The ratio of the frequencies of the long wavelength limits of Lyman and Balmer series of hydrogen spectrum is

A
27 : 5

B
5 : 27

C
4 : 1

D
1 : 4

Solution
Question 4
4 / -1

In terms of Rydberg\'s constant R, the wave number of the first Balmer line is

A
R

B
3R

C

D

Solution
Question 5
4 / -1

If the ionisation potential of helium atom is 24.6 volt, the energy required to ionise it will be

A
24.6 eV

B
24.6 V

C
13.6 V

D
13.6 eV
Question 6
4 / -1

Which of the transitions in hydrogen atom emits a photon of lowest frequency (n = quantum number)?

A
n = 2 to n = 1

B
n = 4 to n = 3

C
n = 3 to n = 1

D
n = 4 to n = 2

Solution
Question 7
4 / -1

What will be ratio of radii of Li⁷ nucleus to Fe⁵⁶ nucleus?

A
1 : 3

B
1 : 2

C
1 : 8

D
2 : 6

Solution
Question 8
4 / -1

In a hydrogen atom, which of the following electronic transitions would involve the maximum energy change

A
From n = 2 to n = 1

B
From n = 3 to n = 1

C
From n = 4 to n = 2

D
From n = 3 to n = 2
Question 9
4 / -1

In the lowest energy level of hydrogen atom, the electron has the angular momentum

A
π/h

B
h/π

C
h/2π

D
2π/h

Solution
Question 10
4 / -1

The minimum energy required to excite a hydrogen atom from its ground state is

A
13.6 eV

B
–13.6 eV

C
3.4 eV

D
10.2 eV

Solution