Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 139

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Weekly Quiz Competition

Question 1
4 / -1

In a sample of hydrogen like atoms all of which are in ground state, a photon beam containing photons of various energies is passed. In absorption spectrum, five dark lines, are observed. The number of bright lines in the emission spectrum will be (assume that all transitions takes place)

A
5

B
10

C
15

D
None of these

Solution
Question 2
4 / -1

A hydrogen atom emits a photon corresponding to an electron transition from n = 5 to n = 1. The recoil speed of hydrogen atom is almost (mass of proton 1.6 × 10^–27 kg)

A
10ms^–1

B
2 × 10^–2ms^–1

C
4ms^–1

D
8 × 10²ms^–1

Solution
Question 3
4 / -1

Number of nuclei of a radioactive substance at time t = 0 are 1000 and 900 at time t = 2 s. Then number of nuclei at time t = 4 s will be

A
800

B
810

C
790

D
700
Question 4
4 / -1

The ratio between total acceleration of the electron in singly ionized helium atom and hydrogen atom (both in ground state) is

A
1

B
8

C
4

D
16

Solution
Question 5
4 / -1

If the series limit of Lymen series for Hydrogen atom is equal to the series limit of Balmer series for a hydrogen like atom, then atomic number of this hydrogen like atom will be

A
1

B
2

C
3

D
4

Solution
Question 6
4 / -1

Number of spectral lines in hydrogen atom is.

A
6

B
8

C
15

D
∝
Question 7
4 / -1

which of these is a fusion reduction

A

B

C

D
None of these

Solution
Question 8
4 / -1

Nucleon is common name for

A
electron and neutron

B
Proton and neutron

C
neutron and Positron

D
neuron and neutrino
Question 9
4 / -1

A
Isotones

B
Isobars

C
Isotope

D
Isomer
Question 10
4 / -1

A
13.6

B
3.4 eV

C
0.85 eV

D
1.5 eV

Solution