Physics Quiz On Thermodynamics For B.Sc. Students

2.

In Bohr’s model of an atom which of the following is an integral multiple of h/2π?

Angular momentum
Potential energy
Radius of an atom
Kinetic energy

Correct Answer

A. Angular momentum

Explanation

In Bohr's model of an atom, the angular momentum of an electron is quantized and can only take on certain specific values. These values are given by an integral multiple of h/2π, where h is Planck's constant. Therefore, the angular momentum is the only option among the given choices that can be an integral multiple of h/2π.

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3.

The K.E. of the electron in an orbit of radius r in hydrogen atom is proportional to

E^(2)/r
E^(4)/r
2e^(2)/r
E^(2)/2r

Correct Answer

A. E^(2)/r

Explanation

The correct answer is e^(2)/r. The kinetic energy (K.E.) of an electron in an orbit of radius r in a hydrogen atom is proportional to e^(2)/r. This is because the kinetic energy of a particle is directly proportional to its charge (e) squared and inversely proportional to its distance (r) from the center of the orbit. Therefore, as the radius decreases, the kinetic energy increases.

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4.

The different types of energies associated with a molecule are __________

Electronic energy
Vibrational energy
Rotational energy
All of the mentioned

Correct Answer

A. All of the mentioned

Explanation

All of the mentioned types of energies are associated with a molecule. Electronic energy refers to the energy associated with the movement of electrons within the molecule. Vibrational energy refers to the energy associated with the vibration of atoms within the molecule. Rotational energy refers to the energy associated with the rotation of the molecule as a whole. Therefore, all of these energies are present and contribute to the overall energy of a molecule.

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5.

The correct order of different types of energies is __________

E_el >> E_vib >> E_rot >> E _tr
E_el >> E_rot >> E_vib >> E _tr
E_el >> E_vib >> E_tr >> E _rot
E<sub style="font-variant-ligatures:normal; font-variant-caps:normal; orphans:2; widows:2; -webkit-text-stroke-width:0px; text-decoration-style:initial; text-decoration-color:initial; word-spacing:0px">tr >> E<sub style="font-variant-ligatures:normal; font-variant-caps:normal; orphans:2; widows:2; -webkit-text-stroke-width:0px; text-decoration-style:initial; text-decoration-color:initial; word-spacing:0px">vib >> E<sub style="font-variant-ligatures:normal; font-variant-caps:normal; orphans:2; widows:2; -webkit-text-stroke-width:0px; text-decoration-style:initial; text-decoration-color:initial; word-spacing:0px">rot >> E <sub style="font-variant-ligatures:normal; font-variant-caps:normal; orphans:2; widows:2; -webkit-text-stroke-width:0px; text-decoration-style:initial; text-decoration-color:initial; word-spacing:0px">el

Correct Answer

A. E_el >> E_vib >> E_rot >> E _tr

Explanation

The correct order of different types of energies is Eel (electrical energy) >> Evib (vibrational energy) >> Erot (rotational energy) >> E tr (translational energy). This order represents the hierarchy of energy types, with electrical energy being the highest in the hierarchy, followed by vibrational energy, rotational energy, and finally translational energy.

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6.

The transition zone for Raman spectra is __________

Between magnetic levels of unpaired electrons
Between magnetic levels of nuclei
Between electronic levels
Between vibrational and rotational levels

Correct Answer

A. Between vibrational and rotational levels

Explanation

The transition zone for Raman spectra is between vibrational and rotational levels. Raman spectroscopy is a technique that involves the interaction of light with molecules, causing a shift in energy levels. The energy levels of molecules can be categorized into electronic, vibrational, and rotational levels. In Raman spectroscopy, the transition zone refers to the energy range where transitions occur between the vibrational and rotational levels of the molecule. This transition zone is important in Raman spectroscopy as it provides information about the molecular structure and dynamics.

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7.

Solar cell works based on

Laser technology
Tyndall effect
Photo-conduction
Thermal emission

Correct Answer

A. Photo-conduction

Explanation

Solar cells work based on the principle of photo-conduction. Photo-conduction refers to the process where the absorption of light by a material generates electric charges, leading to the flow of current. In solar cells, photons from sunlight are absorbed by a semiconductor material, such as silicon, creating electron-hole pairs. These charges then separate at the junction of different materials within the solar cell, creating a voltage difference and generating an electric current. Therefore, photo-conduction is the correct explanation for how solar cells convert sunlight into electricity.

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8.

Luminescence is because of

Photons emitted while excited electrons drops down
Knocking out of electrons by photons
Photons stimulated by photons
All

Correct Answer

A. Photons emitted while excited electrons drops down

Explanation

When an electron is excited to a higher energy level, it can drop back down to its original energy level. During this process, it releases energy in the form of photons, which are particles of light. This phenomenon is known as luminescence. Therefore, the correct answer is "Photons emitted while excited electrons drops down."

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9.

Visible light’s wavelength range ______________

0.39 – 0.77 mm
0.39 – 0.77 µm
0.39 – 0.77 nm
0.39 – 0.77 cm
Option 5

Correct Answer

A. 0.39 – 0.77 mm

Explanation

Visible light's wavelength range is typically measured in nanometers, not millimeters. The correct answer is 0.39 – 0.77 μm, which represents the range of wavelengths for visible light.

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10.

Proton has the charge

1637 times of an electron
1737 times of an electron
1837 times of an electron
1937 times of an electron

Correct Answer

A. 1837 times of an electron

Explanation

The charge of a proton is 1837 times greater than the charge of an electron.

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Physics Quiz On Thermodynamics For B.Sc. Students

If 13.6 eV energy is required to ionise the hydrogen atom, then energy required to remove an electron from n = 2 is

Quiz Preview

In Bohr’s model of an atom which of the following is an integral multiple of h/2π?

The K.E. of the electron in an orbit of radius r in hydrogen atom is proportional to

The different types of energies associated with a molecule are __________

The correct order of different types of energies is __________

The transition zone for Raman spectra is __________

Solar cell works based on

Luminescence is because of

Visible light’s wavelength range ______________

Proton has the charge