Question 1

When a charged particle is accelerated through a potential difference V, it's kinetic energy&#10;A)decreases&#10;B)remains same&#10;C)increases&#10;D)varies depending on resistance of wire

Accepted Answer

When a charged particle is accelerated through a potential difference (V), its kinetic energy increases. This is because the work done on the particle by the electric field is equal to the change in its kinetic energy, according to the work-energy principle.

Question 2

Energy of an electron in an atom is&#10;A)quantized&#10;B)continuous&#10;C)radial&#10;D)randomized

Accepted Answer

Energy levels of an electron in an atom are quantized, meaning electrons can only exist at specific energy levels.

Question 3

In dark, LDR has&#10;A)low resistance&#10;B)high current&#10;C)high resistance&#10;D)both A and B

Accepted Answer

In the dark, an LDR (Light Dependent Resistor) has high resistance because its conductivity decreases without light, making it harder for current to flow through it.

Question 4

Electrons show diffraction effects because their de Broglie wavelength is similar to&#10;A)spacing between atomic layers&#10;B)no. of atomic layers&#10;C)nature of atomic layers&#10;D)positioning of atomic layers

Accepted Answer

Electrons exhibit diffraction effects when their de Broglie wavelength is of a similar scale to the spacing between atomic layers in a crystal, allowing them to interact with the crystal structure in a wave-like manner.

Question 5

Characteristic properties of waves are&#10;A)reflection&#10;B)refraction&#10;C)interference&#10;D)all of above

Accepted Answer

All of the options listed, reflection, refraction, and interference, are characteristic properties of waves, making all of the above the correct answer.

Question 6

Plank's constant has units {{}} A)J B)s C)J s^-1 D)J s

Accepted Answer

Plank's constant has units of Joule seconds (J s), which is a measure of the quantum of electromagnetic action that relates the energy of a photon to its frequency.

Question 7

Gas atoms that exert negligible electrical forces on each other are&#10;A)molecules&#10;B)compounds&#10;C)isotopes&#10;D)isolated atoms

Accepted Answer

Isolated atoms exert negligible electrical forces on each other because they are not bonded or interacting significantly with other atoms, unlike molecules or compounds which consist of two or more atoms bonded together, and isotopes which refer to variations of the same element with different numbers of neutrons.

Question 8

Quantum of electromagnetic energy is called&#10;A)particles&#10;B)photons&#10;C)waves&#10;D)energy

Accepted Answer

Photons are the quantum of electromagnetic energy, meaning they are the smallest discrete amount or quantum of electromagnetic radiation. They are the fundamental particle associated with electromagnetic force.

Question 9

In photoelectric effect, electrons should be removed from the&#10;A)inner shells&#10;B)surface&#10;C)from core&#10;D)the nucleus

Accepted Answer

In the photoelectric effect, electrons are ejected from the surface of a material when it absorbs electromagnetic radiation, typically light. This is because the effect involves the absorption of photons by electrons near the surface, leading to their ejection from the material. Electrons in inner shells, the core, or the nucleus are not directly involved in this process.

Question 10

Light interacts with matter as&#10;A)wave&#10;B)particle&#10;C)both A and B&#10;D)rays

Accepted Answer

The answer of Light interacts with matter as&#10;A)wave&#10;B)particle&#10;C)both A and...

Question 11

When white light is passed through cool gases, the spectra observed is called&#10;A)line spectra&#10;B)continuous spectra&#10;C)emission line spectra&#10;D)absorption line spectra

Accepted Answer

The answer of When white light is passed through cool...

Question 12

Wavelength of ultraviolet region of electromagnetic spectrum is&#10;A)121 nm&#10;B)120 nm&#10;C)119 nm&#10;D)130 nm

Accepted Answer

The answer of Wavelength of ultraviolet region of electromagnetic spectrum...

Question 13

In an insulator, the valence band is&#10;A)fully occupied&#10;B)fully empty&#10;C)half filled&#10;D)half charged

Accepted Answer

The answer of In an insulator, the valence band is&#10;A)fully...

Question 14

Number of protons in an atom determine&#10;A)chemical properties&#10;B)physical properties&#10;C)magnetic properties&#10;D)electrical properties

Accepted Answer

The answer of Number of protons in an atom determine&#10;A)chemical...

Question 15

In &#946;+ decay, an UP quark becomes&#10;A)a strange quark&#10;B)a simple quark&#10;C)a down quark&#10;D)an anti-quark

Accepted Answer

The answer of In &#946;+ decay, an UP quark becomes&#10;A)a...

Question 16

Most of the space in an atom is&#10;A)filled with positive charge&#10;B)empty&#10;C)filled with negative charge&#10;D)filled with neutrons

Accepted Answer

The answer of Most of the space in an atom...

Question 17

A proton is made up of&#10;A)one up quark and two down quarks&#10;B)an up quark and down antiquark&#10;C)two up quarks and a down quark&#10;D)strange quark and an anti-strange quark

Accepted Answer

The answer of A proton is made up of&#10;A)one up...

Question 18

Neutrinos have electric charge of&#10;A)zero&#10;B)1&#10;C)2&#10;D)3

Accepted Answer

The answer of Neutrinos have electric charge of&#10;A)zero&#10;B)1&#10;C)2&#10;D)3...

Question 19

&#946;-radiations are simply {{}}&#10;A)protons&#10;B)neutrons&#10;C)electrons&#10;D)muons

Accepted Answer

The answer of &#946;-radiations are simply {{}}&#10;A)protons&#10;B)neutrons&#10;C)electrons&#10;D)muons...

Question 20

In a nuclear process, the quantity conserved is&#10;A)mass-energy&#10;B)momentum&#10;C)mass only&#10;D)energy only

Accepted Answer

The answer of In a nuclear process, the quantity conserved...

Question 21

A specific combination of protons and neutrons in a nucleus is called&#10;A)nucleons&#10;B)nuclide&#10;C)neutrino&#10;D)nucleolus

Accepted Answer

The answer of A specific combination of protons and neutrons...

Deck 23: Physics and Nuclear Science