Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 81

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Weekly Quiz Competition

Question 1
4 / -1

In Bohr\'s model of hydrogen atom, let PE represents potential energy and TE the total energy. In going to a higher level

A
PE decreases, TE increases

B
PE increases, TE increases

C
PE decreases, TE decreases

D
PE increases, TE decreases

Solution
Question 2
4 / -1

The extreme wavelengths of Paschen series are

A
0.365μm and 0.565 μm

B
0.818μm and 1.89μm

C
1.45μm and 4.04µm

D
2.27μm and 7.43 μm

Solution
Question 3
4 / -1

The third line of Balmer series of an ion equivalent to hydrogen atom has wavelength of 108.5 nm. The ground state energy of an electron of this ion will be

A
3.4 eV

B
13.6 eV

C
–54.4 eV

D
122.4 eV

Solution
Question 4
4 / -1

The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statements is true

A
Its kinetic energy increases and its potential and total energies decrease

B
Its kinetic energy decreases, potential energy increases and its total energy remains the same

C
Its kinetic and total energies decreases and its potential energy increases

D
Its kinetic, potential and total energies decrease

Solution
Question 5
4 / -1

K_α and K_β, X-rays are emitted when there is a transition of electron between the levels

A
n = 2 to n = 1 and n = 3 to n = 1 respectively

B
n = 2 to n =1 and n = 3 to n = 2 respectively

C
n = 3 to n = 2 and n = 4 to n = 2 respectively

D
n = 3 to n = 2 and n = 4 to n = 3 respectively

Solution
Question 6
4 / -1

Orbital acceleration of electron is

A

B

C

D

Solution
Question 7
4 / -1

Which of the following is true for number of spectral lines in going from Lyman series to P-fund series ?

A
Increases

B
Decreases

C
Unchanged

D
May decrease or increase
Question 8
4 / -1

Energy of an electron in an excited hydrogen atom is –3.4 eV. Its angular momentum will be

A

B

C

D

Solution
Question 9
4 / -1

The ratio of speed of an electron in ground state in Bohr\'s first orbit of hydrogen atom to velocity of light in air is

A

B

C

D
Question 10
4 / -1

The de-Broglie wavelength of an electron in the first Bohr orbit is

A
Equal to one fourth the circumference of the first orbit

B
Equal to half the circumference of the first orbit

C
Equal to twice the circumference of the first orbit

D
Equal to the circumference of the first orbit

Solution