Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 79

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Weekly Quiz Competition

Question 1
4 / -1

The wave length of the first line of Lyman series for hydrogen atom is equal to that of hydrogen atom is equal to that of second line of Balmar series for a hydrogen like ion. The atomic number Z of hydrogen like ion is

A
1

B
2

C
3

D
4

Solution
Question 2
4 / -1

At a certain time, a radio active sample contains 2 × 10²⁰ atoms and disintegration rate is 3 × 10¹⁰ atom persec. when 2 × 10¹⁵ atoms left to decay its disintegation rate will be

A
3 × 10⁵ atom / s

B
3 × 10¹⁰ atom / s

C
6.6 × 10¹ atom / s

D
2.0 × 10² atom / s

Solution
Question 3
4 / -1

Excited hydrogen atom emits a Photon of wave length in returning to the ground state The quantum number n of exulted state is given by

A

B

C

D

Solution
Question 4
4 / -1

A
72

B
78

C
65

D
80

Solution
Question 5
4 / -1

A
a → r, b → s, c → q, d → p

B
a → q, b → p, c → s, d → r

C
a → s, b → r, c → q, d → p

D
b → s, c → p, c → q, d → r

Solution
Question 6
4 / -1

The energy levels of the hydrogen spectrum is shown in figure. There are some transitions A,B,C,D and E. Transition A, B and C respectively represent

A
First member of Lyman series, third spectral line of Balmer series and the second spectral line of Paschen series

B
Ionization potential of hydrogen, second spectral line of Balmer series and third spectral line of Paschen series

C
Series limit of Lyman series, third spectral line of Balmer series and second spectral line of Paschen series

D
Series limit of Lyman series, second spectral line of Balmer series and third spectral line of Paschen series

Solution
Question 7
4 / -1

In the figure D and E respectively represent

A
Absorption line of Balmer series and the ionization energy of hydrogen

B
Absorption line of Balmer series and the wavelength lesser than lowest of the Lyman series

C
Spectral line of Balmer series and the maximum wavelength of Lyman series

D
Spectral line of Lyman series and the absorption of greater wavelength of limiting value of Paschen series

Solution
Question 8
4 / -1

The Rutherford α-particles experiment shows that most of the α-particles pass through almost unscattered while some are scattered through large angles. What information does it give about the structure of the atom

A
Atom is hollow

B
The whole mass of the atom is concentrated in a small centre called nucleus

C
Nucleus is positively charged

D
All the above
Question 9
4 / -1

Which of the following is true?

A
Lyman series is a continuous spectrum

B
Paschen series is a line spectrum in the infrared

C
Balmer series is a line spectrum in the ultraviolet

D
The spectral series formula can be derived from the Rutherford model of the hydrogen atom
Question 10
4 / -1

The transition from he state n = 4 to n = 3 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from

A
2 → 1

B
3 → 2

C
4 → 2

D
5 → 4

Solution