Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 104

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Weekly Quiz Competition

Question 1
4 / -1

The radius of the Bohr orbit in the ground state of hydrogen atom is 0.5 Å. The radius of the orbit of the electron in the third excited state of He⁺ will be

A
8 Å

B
4 Å

C
0.5 Å

D
0.25 Å

Solution
Question 2
4 / -1

The ratio of the speed of the electron in the first Bohr orbit of hydrogen and the speed of light is equal to (where e, h and c have their usual meanings)

A
2πhc /e²

B
e²h /2πc

C
e²c /2πh

D
2πe²/hc

Solution
Question 3
4 / -1

According to the Rutherford\'s atomic model, the electrons inside the atom are

A
Stationary

B
Not stationary

C
Centralized

D
None of these
Question 4
4 / -1

Rutherford\'s α–particle experiment showed that the atoms have

A
Proton

B
Nucleus

C
Neutron

D
Electrons
Question 5
4 / -1

The diagram shows the path of four α–particles of the same energy being scattered by the nucleus of an atom simultaneously. Which of these are/is not physically possible?

A
3 and 4

B
2 and 3

C
1 and 4

D
4 only

Solution
Question 6
4 / -1

An electron jumps from 5th orbit to 4th orbit of hydrogen atom. Taking the Rydberg constant as 10⁷ per metre what will be the frequency of radiation emitted

A
6.75 × 10¹² Hz

B
6.75 × 10¹⁴ Hz

C
6.75 × 10¹³ Hz

D
None of these

Solution
Question 7
4 / -1

For principal quantum number n = 3, the possible values of orbital quantum number \'1\' are

A
1, 2, 3

B
0, 1, 2, 3

C
0, 1, 2,

D
–1, 0, +1

Solution
Question 8
4 / -1

Four lowest energy levels of H–atom are shown in the figure. The number of possible emission lines would be

A
3

B
4

C
5

D
6

Solution
Question 9
4 / -1

The order of the size of nucleus and Bohr radius of an atom respectively are

A
10¹⁴ m, 10^–10 m

B
10^–10 m, 10^–8 m

C
10^–20 m, 10^–16 m

D
10^–8 m, 10^–6 m

Solution
Question 10
4 / -1

Minimum energy required to takeout the only oneelectron from ground state of He⁺is

A
13.6 eV

B
54.4 eV

C
27.2 eV

D
6.8 eV

Solution