Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 5

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Weekly Quiz Competition

Question 1
4 / -1

Which state of triply ionised beryllium (Be³⁺) has the same orbital radius as that of the ground state of hydrogen?

A
n = 3

B
n = 4

C
n = 1

D
n = 2
Question 2
4 / -1

Excitation energy of a hydrogen like atom in its first excitation state is 40.8 eV. Energy needed to remove the electron from the ion in ground state is

A
40.8eV

B
27.2 eV

C
54.4eV

D
13.6eV
Question 3
4 / -1

Mercury vapour lamp gives

A
continuous spectrum

B
line spectrum

C
band spectrum

D
absorption spectrum
Question 4
4 / -1

Electrons in the atom are held to the nucleus by

A
Coulomb's forces

B
nuclear forces

C
van der Waals' forces

D
gravitational forces
Question 5
4 / -1

In hydrogen atom, the electron is moving round the nucleus 2.18 × 10⁶ ms^-1 in an orbit of radius 0.528 Å. The acceleration of the electron is

A
9 × 10¹⁸ ms^-2

B
9 × 10²² ms^-2

C
9 × 10^-22 ms^-2

D
9 × 10¹² ms^-2
Question 6
4 / -1

The ionisation energy of 10 times ionised sodium atom is

A

B

C

D

Solution
Question 7
4 / -1

A
1.5 eV

B
0.85 eV

C
3.4 eV

D
1.9 eV
Question 8
4 / -1

Bohr's atom model assumes

A
the nucleus is of infinite mass and is at rest

B
electrons in a quantised orbit will not radiate energy

C
mass of electron remains constant

D
All the above conditions
Question 9
4 / -1

Wavelength of first line in Lyman series is λ. The wavelength of first line in Balmer series is

A

B

C

D
Question 10
4 / -1

What is the maximum wavelength of light emitted in Lyman series by hydrogen atom?

A
691 nm

B
550 nm

C
380 nm

D
122 nm