Atoms and Nuclei Test

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Atoms and Nuclei Test - 3

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Question 1
1 / -0

What is the unit of mass when measured on the atomic scale?

A
Unified atomic mass unit

B
Milligram

C
Kilogram

D
Gram

Solution

The unified atomic mass unit (u) is defined as one twelfth of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest.
Question 2
1 / -0

Which of the following statements is correct?

A
β-rays are the same as cathode rays.

B
Gamma rays are high energy electrons.

C
Alpha rays have maximum penetration capacity.

D
Protons and neutrons have exactly the same mass.
Question 3
1 / -0

A free neutron decays into

A
A proton, an electron, and an antineutrino

B
A proton, a positron and a neutrino

C
A proton, a positron and a antineutrino

D
A proton, an electron and a neutrino

Solution

Free neutrons are unstable. A free neutron (n⁰) decays into a proton (p⁺), an electron (e⁻), and an electron antineutrino (νe¯). This phenomenon is called beta decay.
Question 4
1 / -0

Assertion (A): Nuclear forces arise from strong Coulombic interactions between protons and neutrons.

Reason (R): Nuclear forces are independent of the charge of the nucleons.

A
Both (A) and (B) are true and (R) is the correct explanation of (A).

B
Both (A) and (B) are true, but (R) is not the correct explanation of (A).

C
(A) is true, but (R) is false.

D
(A) is false, but (R) is true.
Question 5
1 / -0

Bohr's model of an atom

A
assumes that the angular momentum of electrons is quantised

B
uses Einstein's photoelectric equation

C
predicts continuous emission spectra for atoms

D
predicts the same emission spectra for all types of atoms
Question 6
1 / -0

Relation between atomic number (Z), neutron number (N) and mass number (A) is

A
A= Z - N

B
Z = A + 2N

C
A = Z + N

D
Z = A + N

Solution

mass number (A) = total number of nucleons = number of protons + number of nutrons = atomic number (Z) + neutron number (N).
Question 7
1 / -0

In the fission of one part of uranium, if 0.5 gm mass is decayed, then how much energy (in kWh) will be obtained?

A
1.25 x 10⁷

B
1.5 x 10⁵

C
2.1 x 10⁷

D
4.5 x 10⁷
Question 8
1 / -0

In Geiger-Marsden experiment very small deflection of the beam was expected because

A
the positive charge and the negatively charged electrons are distributed through the whole atom reducing electric field inside the atom

B
there are no electrical forces at work

C
most particles pass through

D
particles are collimated by lead screens

Solution

This expectation was based on the knowledge of the "Plum pudding model", proposed by JJ Thomson, where the positive charge and the negatively charged electrons were distributed throughout the whole atom. According to this model, all the alpha particles in the beam should pass through the foil without much scattering. However this experiment of Geiger-Marsden proved the Thomson's model wrong.
Question 9
1 / -0

Nuclides with same neutron number N but different atomic numbers Z are called

A
Isotopes

B
Isotones

C
Isobars

D
Isoclines

Solution

Two nuclides are isotones if they have the same neutron number N, but different proton number Z. For example, boron-12 and carbon-13 nuclei both contain 7 neutrons, and so are isotones.

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Re-Attempt Weekly Quiz Competition

Atoms and Nuclei Test - 3

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Atoms and Nuclei Test - 3

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Question 1

Unified atomic mass unit

Milligram

Kilogram

Gram

Solution

Question 2

β-rays are the same as cathode rays.

Gamma rays are high energy electrons.

Alpha rays have maximum penetration capacity.

Protons and neutrons have exactly the same mass.

Question 3

A proton, an electron, and an antineutrino

A proton, a positron and a neutrino

A proton, a positron and a antineutrino

A proton, an electron and a neutrino

Solution

Question 4

Both (A) and (B) are true and (R) is the correct explanation of (A).

Both (A) and (B) are true, but (R) is not the correct explanation of (A).

(A) is true, but (R) is false.

(A) is false, but (R) is true.

Question 5

assumes that the angular momentum of electrons is quantised

uses Einstein's photoelectric equation

predicts continuous emission spectra for atoms

predicts the same emission spectra for all types of atoms

Question 6

A= Z - N

Z = A + 2N

A = Z + N

Z = A + N

Solution

Question 7

1.25 x 107

1.5 x 105

2.1 x 107

4.5 x 107

Question 8

the positive charge and the negatively charged electrons are distributed through the whole atom reducing electric field inside the atom

there are no electrical forces at work

most particles pass through

particles are collimated by lead screens

Solution

Question 9

Isotopes

Isotones

Isobars

Isoclines

Solution

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1.25 x 10⁷

1.5 x 10⁵

2.1 x 10⁷

4.5 x 10⁷