Atoms and Nuclei Test

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Atoms and Nuclei Test - 83

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following particles are constituents of the nucleus?

A
Protons and electrons

B
Protons and neutrons

C
Neutrons and electrons

D
Neutrons and positrons
Question 2
4 / -1

The binding energies per nucleon for a deuteron and an α-particle are x₁ and x₂ respectively. What will be the energy Q released in the reaction
₁H² + ₁H² → ₂He⁴ + Q

A
4(x₁ + x₂)

B
4(x₂ – x₁)

C
2(x₁ + x₂)

D
2(x₂ – x₁)

Solution
Question 3
4 / -1

Nucleus of an atom whose atomic mass is 24 consists of

A
11 electrons, 11 protons and 13 neutrons

B
11 electrons, 13 protons and 11 neutrons

C
11 protons and 13 neutrons

D
11 protons and 13 electrons
Question 4
4 / -1

Isotopes are atoms having

A
Same number of protons but different number of neutrons

B
Same number of neutrons but different number of protons

C
Same number of protons and neutrons

D
None of the above
Question 5
4 / -1

The mass of an α-particle is

A
Less than the sum of masses of two protons and two neutrons

B
Equal to mass of four protons

C
Equal to mass of four neutrons

D
Equal to sum of masses of two protons and two neutrons
Question 6
4 / -1

A nucleus ruptures into two nuclear parts which have their velocity ratio equal to 2 : 1. What will be the ratio of their nuclear size (nuclear radius)

A
2^1/3 : 1

B
1: 2^1/3

C
3^1/3 : 1

D
1 : 3^1/3

Solution
Question 7
4 / -1

Which of the following isotopes is normally fissionable?

A
₉₂U²³⁸

B
₉₃NP²³⁹

C
₉₂U²³⁵

D
₂He⁴

Solution
Question 8
4 / -1

When a ₄Be⁹ atom is bombarded with α-particles, one of the products of nuclear transmutation is ₆C¹². The other is

A
_–1e⁰

B
₁H¹

C
₁D²

D
₀n¹

Solution
Question 9
4 / -1

A radioactive sample S₁ having the activity A₁ has twice the number of nuclei as another sample S₂ of activity A₂. If A₂ = 2A₁, then the ratio of half life of S₁ to the life of S₂ is

A
4

B
2

C
0.25

D
0.75

Solution
Question 10
4 / -1

During the nuclear fusion reaction

A
A heavy nucleus breaks into two fragments by itself

B
A light nucleus bombarded by thermal neutrons breaks up

C
A heavy nucleus bombarded by thermal neutrons breaks up

D
Two light nuclei combine to give a heavier nucleus and possibly other products

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Atoms and Nuclei Test - 83

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Atoms and Nuclei Test - 83

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Question 1

Protons and electrons

Protons and neutrons

Neutrons and electrons

Neutrons and positrons

Question 2

4(x1 + x2)

4(x2 – x1)

2(x1 + x2)

2(x2 – x1)

Solution

Question 3

11 electrons, 11 protons and 13 neutrons

11 electrons, 13 protons and 11 neutrons

11 protons and 13 neutrons

11 protons and 13 electrons

Question 4

Same number of protons but different number of neutrons

Same number of neutrons but different number of protons

Same number of protons and neutrons

None of the above

Question 5

Less than the sum of masses of two protons and two neutrons

Equal to mass of four protons

Equal to mass of four neutrons

Equal to sum of masses of two protons and two neutrons

Question 6

21/3 : 1

1: 21/3

31/3 : 1

1 : 31/3

Solution

Question 7

92U238

93NP239

92U235

2He4

Solution

Question 8

–1e0

1H1

1D2

0n1

Solution

Question 9

4

2

0.25

0.75

Solution

Question 10

A heavy nucleus breaks into two fragments by itself

A light nucleus bombarded by thermal neutrons breaks up

A heavy nucleus bombarded by thermal neutrons breaks up

Two light nuclei combine to give a heavier nucleus and possibly other products

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4(x₁ + x₂)

4(x₂ – x₁)

2(x₁ + x₂)

2(x₂ – x₁)

2^1/3 : 1

1: 2^1/3

3^1/3 : 1

1 : 3^1/3

₉₂U²³⁸

₉₃NP²³⁹

₉₂U²³⁵

₂He⁴

_–1e⁰

₁H¹

₁D²

₀n¹