Atoms and Nuclei Test

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Atoms and Nuclei Test - 2

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Weekly Quiz Competition

Question 1
4 / -1

α – particles of kinetic energy 7.7 MeV are being scattered by the nucleus of gold which has 79 electrons. The distance of closest approach of the alpha particles is

A
4 × 10^-14 m

B
30 × 10^-15 m

C
10 × 10^-15 m

D
7.9 × 10^-14 m
Question 2
4 / -1

The orbital frequency of an electron in the hydrogen atom is proportional to

A
n³

B
n^-3

C
n

D
n^o

Solution
Question 3
4 / -1

The product of linear momentum and angular momentum of an electron of the hydrogen atom is proportional to n^x, where x is

A
0

B
1

C
–2

D
2

Solution
Question 4
4 / -1

Which of the following transitions in Balmer series for hydrogen will have longest wavelength?

A
n = 2 to n = 1

B
n = 6 to n = 1

C
n = 3 to n = 2

D
n = 6 to n = 2
Question 5
4 / -1

Ionisation energy of He⁺ ion at minimum position is

A
13.6 eV

B
27.2 eV

C
54.4 eV

D
68.0 eV
Question 6
4 / -1

Which of the following transition gives the photon of minimum frequency?

A
n = 2 to n = 1

B
n = 3 to n = 1

C
n = 3 to n = 2

D
n = 4 to n = 3
Question 7
4 / -1

According to Bohr's theory of hydrogen atom, for the electron in the nth allowed orbit the
I. . linear momentum is proportional to 1/n
II. radius is proportional to n
III. kinetic energy is proportional to 1/n²
IV. angular momentum is proportional to n
Choose the correct option from the codes given below.

A
I, III, IV are correct

B
Only I is correct

C
I and II are correct

D
Only III is correct
Question 8
4 / -1

The radius of hydrogen atom in its ground state is 5.3 × 10^-11 m. After collision with an electron it is found to have a radius of 21.2 × 10^-11 m. What is the principal quantum number n of the final state of atom ?

A
n = 4

B
n = 2

C
n = 16

D
n = 3

Solution
Question 9
4 / -1

If an electron is revolving around the hydrogen nucleus at a distance of 0.1 nm, what should be its speed?

A
2.188 × 10⁶ ms^-1

B
1.094 × 10⁶ ms^-1

C
4.376 × 10⁶ ms^-1

D
1.59 × 10⁶ ms^-1

Solution
Question 10
4 / -1

Continuous emission spectrum is produced by

A
incandescent electric lamp

B
mercury vapour lamp

C
sodium vapour lamp

D
polyatomic substances

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Re-Attempt Weekly Quiz Competition

Atoms and Nuclei Test - 2

Result

Atoms and Nuclei Test - 2

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Question 1

4 × 10-14 m

30 × 10-15 m

10 × 10-15 m

7.9 × 10-14 m

Question 2

n3

n-3

n

no

Solution

Question 3

0

1

–2

2

Solution

Question 4

n = 2 to n = 1

n = 6 to n = 1

n = 3 to n = 2

n = 6 to n = 2

Question 5

13.6 eV

27.2 eV

54.4 eV

68.0 eV

Question 6

n = 2 to n = 1

n = 3 to n = 1

n = 3 to n = 2

n = 4 to n = 3

Question 7

I, III, IV are correct

Only I is correct

I and II are correct

Only III is correct

Question 8

n = 4

n = 2

n = 16

n = 3

Solution

Question 9

2.188 × 106 ms-1

1.094 × 106 ms-1

4.376 × 106 ms-1

1.59 × 106 ms-1

Solution

Question 10

incandescent electric lamp

mercury vapour lamp

sodium vapour lamp

polyatomic substances

User

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My Perfomance

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Rank

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4 × 10^-14 m

30 × 10^-15 m

10 × 10^-15 m

7.9 × 10^-14 m

n³

n^-3

n^o

2.188 × 10⁶ ms^-1

1.094 × 10⁶ ms^-1

4.376 × 10⁶ ms^-1

1.59 × 10⁶ ms^-1