Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 7

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Weekly Quiz Competition

Question 1
4 / -1

₉₂U²³⁵ undergoes successive disintegrations with the end product of ₈₂Pb²⁰³. The number α and β-particles emitted are

A
α = 6, β = 4

B
α = 6, β = 0

C
α = 8, β = 6

D
α = 3, β = 3

Solution
Question 2
4 / -1

Which of the following is a possible nuclear reaction ?

A

B

C

D

Solution
Question 3
4 / -1

The radius of nucleus is

A
proportional to its mass number

B
inversely proportional to its mass number

C
proportional to the cube root of its mass number

D
not related to its mass number
Question 4
4 / -1

m_p and m_n are masses of proton and neutron, respectively. An element of mass M has Z protons and N neutrons then

A
M > (Zm_p + Nm_n)

B
M = (Zm_p + Nm_n)

C
M < (Zm_p + Nm_n)

D
M may be grater than less than or equal to Zm_p + Nm_n, depending on nature of element
Question 5
4 / -1

A nucleus with Z = 92 emits the following in a sequence : α, α, β^-, β^-, α, α, α, α, β^-, β^-, α, β⁺, β⁺, α. The Z of the resulting nucleus is

A
76

B
78

C
82

D
74
Question 6
4 / -1

A nucleus disintegrates into two nuclear parts which have their velocities in the ratio 2: 1. The ratio of their nuclear sizes will be

A
2^1/3 : 1

B
1 : 3^1/2

C
3^1/2 : 1

D
1 : 2^1/3

Solution
Question 7
4 / -1

A
13.9 MeV

B
26.9 MeV

C
23.6 MeV

D
19.2 MeV
Question 8
4 / -1

When ₃Li⁷ nuclei are bombarded by protons, and the resultant nuclei are ₄Be⁸. the emitted particles will be

A
α – particles

B
β – particles

C
γ – photons

D
neutrons

Solution
Question 9
4 / -1

The mass number of nucleus is

A
sometimes equal to its atomic number

B
sometimes less than and sometimes more than its atomic number

C
always less than its atomic number

D
always more than its atomic number
Question 10
4 / -1

A free neutron decays spontaneously into

A
a proton, an electron and anti-neutrino

B
a proton, an electron and aneutrino

C
a proton and electron

D
a proton, an electron, a neutrino and an anti-neutrino