| 2024-01-30 | Two-point charges \( +9 e \) and \( +e \) are at \( 16 \mathrm{~cm} \) away from each other. Whe.... | 4:13 | 1 | |
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| 2024-01-30 | An object \( A \) has a charge of \( -2 \mu \mathrm{C} \) and the object \( B \) has a charge of.... | 3:03 | 1 | |
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| 2024-01-30 | The maximum electric field intensity on the axis of a uniformly charged ring of charge \( q \) a.... | 3:43 | 1 | |
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| 2024-01-30 | A charge \( Q \) is placed at the centre of a square. If electric field intensity due to the cha.... | 1:36 | 7 | |
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| 2024-01-30 | The magnitude of electric field intensity \( \mathrm{E} \) is such that, an electron placed in i.... | 2:45 | 4 | |
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| 2024-01-30 | Three charges \( 4 q, \mathrm{Q} \) and \( q \) are in a straight line in the position of .... | 3:52 | 2 | |
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| 2024-01-30 | The acceleration of an electron in an electric field of magnitude \( 50 \mathrm{~V} / \mathrm{cm.... | 3:14 | 0 | |
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| 2024-01-30 | Infinite charges of magnitude \( q \) each are lying at \( x=1,2,4,8 . \). metre on \( X \)-axis.... | 2:33 | 0 | |
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| 2024-01-30 | The \( \mathrm{K}_{\alpha} \) X-rays emission line of tungsten occurs at \( \lambda=0.021 \.... | 3:26 | 0 | Let's Play |
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| 2024-01-30 | When the distance between the charged particles is halved, the force between them becomes.... | 2:38 | 0 | |
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| 2024-01-30 | The charges on two spheres are \( +7 \mu \mathrm{C} \) and \( -5 \mu \mathrm{C.... | 1:26 | 0 | |
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| 2024-01-30 | A total charge \( \mathrm{Q} \) is broken in two parts \( \mathrm{Q}_{1} \) and \( \mathrm{Q}_{2.... | 1:48 | 1 | |
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| 2024-01-30 | The pressure exerted by an electromagnetic wave of intensity I (watts \( / \mathrm{m}^{2} \.... | 1:45 | 2 | |
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| 2024-01-30 | Moseleys law for characteristic X-rays is:.... | 1:15 | 1 | |
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| 2024-01-30 | Which of the following is not electromagnetic waves?.... | 1:06 | 0 | |
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| 2024-01-30 | Out of the following options which one can be used to produce a propagating electromagnetic.... | 1:34 | 2 | |
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| 2024-01-30 | If microwaves, \( \mathrm{X} \)-rays, infrared, gamma rays, ultra- violet, radio waves and .... | 1:33 | 1 | |
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| 2024-01-30 | The ratio of energy of electron in hydrogen atom and hydrogen like helium ion in first orbi.... | 1:33 | 0 | |
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| 2024-01-30 | The ratio of the energies of the hydrogen atom in its first excited state to second excited.... | 2:00 | 1 | |
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| 2024-01-30 | The magnetic field induction produced at the centre of orbit due to an electron revolving i.... | 3:35 | 0 | |
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| 2024-01-30 | When a hydrogen atom is raised from the ground state to third state.... | 4:23 | 1 | |
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| 2024-01-30 | In Bohrs model of the hydrogen atom, the ratio between the period of revolution of an elect.... | 1:23 | 0 | |
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| 2024-01-30 | In the Bohrs model of a hydrogen atom, the centripetal force is furnished by the Coulomb&nb.... | 2:43 | 0 | |
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| 2024-01-30 | Consider an electron in the \( n \)th orbit of a hydrogen atom in the Bohr model. The circu.... | 2:12 | 0 | |
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| 2024-01-30 | The angular speed of electron in the \( n^{\text {th }} \) orbit of hydrogen atom is.... | 1:48 | 0 | |
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| 2024-01-30 | When a hydrogen atom is raised from the ground state to third state.... | 1:53 | 1 | |
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| 2024-01-30 | In Bohrs model of the hydrogen atom, the ratio between the period of revolution of an elect.... | 2:37 | 0 | |
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| 2024-01-30 | Wavelength of first line in Balmer Series of hydrogen spectrum is \( \lambda \), then wavel.... | 3:30 | 1 | |
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| 2024-01-30 | Thickness of the foil of gold used in \( \alpha \)-particle scattering experiment is.... | 2:57 | 4 | Let's Play |
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| 2024-01-30 | Which of the following represents the ratio of maximum wavelength of Paschen series to that.... | 3:08 | 1 | |
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| 2024-01-30 | According to classical theory, Rutherford atom was.... | 1:31 | 1 | |
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| 2024-01-30 | Energy of the beam of \( \alpha \)-particles used by Geiger and Marsden in scattering exper.... | 1:26 | 4 | Let's Play |
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| 2024-01-30 | When a hydrogen atom is excited from ground state to first excited state its potential ener.... | 2:52 | 1 | |
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| 2024-01-30 | Let \( f_{1} \) be the maximum frequency of Lyman series, \( f_{2} \) be the frequency of f.... | 2:43 | 1 | | Frequency
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| 2024-01-30 | When an electron of hydrogen like atom jumps from a lower energy level to a higher energy level..... | 2:07 | 2 | |
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| 2024-01-30 | The electron in \( \mathrm{H} \)-atom undergoes a transition from 4th state to ground state.... | 0:55 | 0 | |
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| 2024-01-30 | Check the correctness of the following statements regarding Bohr model of hydrogen atom
1. Angul.... | 3:01 | 1 | |
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| 2024-01-30 | As the quantum number increases, the difference of energy between consecutive energy levels.... | 2:49 | 1 | |
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| 2024-01-30 | In case of a hydrogen like atom when an electron jumps from \( n=4 \) to \( n=3 \) it gives.... | 1:50 | 0 | |
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| 2024-01-30 | The difference between \( (n+1)^{\text {th }} \) Bohr radius and \( n^{\text {th }} \) Bohr.... | 1:34 | 0 | |
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| 2024-01-30 | Which of the following is not true for Bohr model of hydrogen atom?.... | 1:43 | 0 | |
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| 2024-01-30 | The ionization potential of \( \mathrm{Li}^{++} \)ion is.... | 1:56 | 0 | |
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| 2024-01-30 | According to Bohrs atomic model.... | 2:22 | 0 | |
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| 2024-01-30 | The radius of the shortest orbit in a one-electron system is \( 18 \mathrm{pm} \). It may b.... | 2:03 | 1 | |
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| 2024-01-30 | Which of the following statements are true regarding Bohrs model of hydrogen atom
I. Orbiti.... | 3:19 | 0 | |
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| 2024-01-30 | The first excitation potential of the hydrogen atom in the ground state is.... | 1:45 | 0 | |
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| 2024-01-30 | Efficiency of a half wave rectifier is nearly:.... | 1:51 | 5 | |
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| 2024-01-30 | Angular momentum of an electron in the hydrogen atom is \( \frac{3 h}{2 \pi} \). Here \( h \) is.... | 1:42 | 0 | |
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| 2024-01-30 | If the magnitude of energy of the electron in \( n^{\text {th }} \) Bohr orbit is \( E_{n} .... | 1:54 | 0 | |
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| 2024-01-30 | The total energy of an atomic electron is.... | 0:55 | 2 | |
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| 2024-01-30 | In an intrinsic semiconductor, the density of conduction electrons is \( 7.07 \times 10^{15} \ma.... | 2:42 | 4 | |
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| 2024-01-30 | In a \( n \)-type semiconductor, which of the following statement is true.... | 2:24 | 1 | |
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| 2024-01-30 | Carbon, silicon and germanium have four valence electrons each. At room temperature which one of.... | 2:42 | 1 | |
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| 2024-01-30 | Find the maximum wavelength of electromagnetic radiation, which can create a hole-electron pair .... | 2:13 | 0 | |
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| 2024-01-30 | The Zener diode is used for.... | 0:55 | 5 | |
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| 2024-01-30 | The energy gap for an insulator may be.... | 1:51 | 0 | |
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| 2024-01-30 | Copper and silicon is cooled from \( 300 \mathrm{~K} \) to \( 60 \mathrm{~K} \), the specific re.... | 1:00 | 0 | |
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| 2024-01-30 | A pure semiconductor has.... | 1:57 | 0 | |
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| 2024-01-30 | Crystalline substances mostly exist in.... | 2:17 | 0 | |
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| 2024-01-30 | The half-lives of a radioactive substance are 1600 year and 400 year for \( \alpha \)-emission a.... | 1:46 | 1 | Let's Play |
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| 2024-01-30 | There is no hole current in conductors because they have.... | 1:27 | 1 | |
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| 2024-01-30 | When a deuterium is bombarded on \( { }_{8} O^{16} \) nucleus, an \( \alpha \)-particle is emitt.... | 1:53 | 0 | Let's Play |
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| 2024-01-30 | Two radioactive substances \( A \) and \( B \) have decay constants such that \( \lambda_{A}=2 \.... | 2:46 | 0 | |
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| 2024-01-30 | When a radioactive nucleus undergoes negative beta decay, the ejected electron is.... | 2:42 | 0 | |
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| 2024-01-30 | The number of \( \beta \)-particles emitted by a radioactive substance is twice the number of \(.... | 2:09 | 0 | |
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| 2024-01-30 | The half-life of \( B i^{210} \) is 5 days. In how much time \( \left(\frac{7}{8}\right)^{t.... | 1:36 | 2 | |
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| 2024-01-30 | If the half-life of a radio-nuclide is two hours the fraction decayed \( n \) four hours will be.... | 1:40 | 0 | |
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| 2024-01-30 | If \( t_{1 / 2} \) is the half life of a substance, then in \( 2\left(t_{1 / 2}\right) \) time s.... | 1:44 | 0 | |
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| 2024-01-30 | Two radioactive isotopes \( P \) and \( Q \) have half lives 10 minutes and 15 minutes respectiv.... | 2:24 | 0 | |
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| 2024-01-30 | Tritium \( \left({ }_{1}^{3} H\right) \) has a half-life of \( 12.5 y \) against beta decay. Wha.... | 1:54 | 0 | |
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| 2024-01-30 | If half life of a radioactive substance is 10 hours, then its mean life is.... | 1:11 | 0 | |
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| 2024-01-30 | After five half lives percentage of original radioactive atoms left is.... | 1:36 | 2 | |
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| 2024-01-30 | A free neutron decay to a proton but a free proton does not decay to a neutron. This is because.... | 2:32 | 2 | |
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| 2024-01-30 | Alpha rays emitted from a radioactive substance are .... | 1:20 | 1 | Let's Play |
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| 2024-01-30 | In which of the following decays the element does not change ?.... | 1:17 | 0 | |
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| 2024-01-30 | Beta rays emitted by a radioactive material are.... | 0:54 | 0 | |
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| 2024-01-30 | The binding energy of \( \alpha \)-particle \( { }_{2}^{4} \mathrm{He} \) is \( 7.047 \mathrm{Me.... | 1:26 | 0 | Let's Play |
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| 2024-01-30 | A heavy nucleus is unstable for any value of \( \frac{N}{P} \) because.... | 1:48 | 0 | |
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| 2024-01-30 | The average binding energy per nucleon in the nucleus of atom is approximately.... | 1:06 | 0 | |
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| 2024-01-30 | The binding energy of nucleus is a measure of its .... | 1:21 | 1 | |
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| 2024-01-30 | Two nuclei have mass number in ratio of \( 1: 4 \). The ratio of their nuclear densities is:.... | 1:44 | 0 | |
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| 2024-01-30 | Radius of \( { }_{2}^{4} \mathrm{He} \) nucleus is 3 Fermi. The radius of \( { }_{16}^{32} \math.... | 1:29 | 1 | |
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| 2024-01-30 | When two nuclei of mass \( X \) and \( Y \) respectively fuse to form a nucleus of mass \( .... | 1:21 | 0 | |
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| 2024-01-30 | An \( \alpha \)-particle of energy \( 3 \mathrm{MeV} \) is scattered through \( 180^{\circ} \) b.... | 3:28 | 2 | Let's Play |
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| 2024-01-30 | The range of nuclear forces is about-.... | 0:54 | 0 | |
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| 2024-01-30 | The nuclei \( { }_{6} A^{13} \) and \( { }_{7} B^{14} \) can be described as.... | 3:03 | 0 | |
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| 2024-01-30 | A high energy gamma ray while passing through the strong electric field of the nucleus sometimes.... | 0:42 | 0 | |
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| 2024-01-30 | Let $F_{p p}, F_{p n}$ and $F_{n n}$ denote the magnitude of the net force by a proton on a prot.... | 2:37 | 0 | |
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| 2024-01-30 | The radius of \( { }_{32}^{A} X \) nuclide is measured to be twice the radius of \( { }_{4}^{9} .... | 1:52 | 0 | |
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| 2024-01-30 | Ratio of nuclear radii of \( { }^{135} \mathrm{Cs} \) to \( { }^{40} \mathrm{Ca} \) is.... | 2:32 | 0 | |
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| 2024-01-30 | Which of the following pair of nuclei are isotones?.... | 3:44 | 0 | |
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| 2024-01-30 | The nuclear radius as compared to the atomic radius is of the order.... | 1:48 | 1 | |
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| 2024-01-30 | Two protons are kept at a separation of 10 nm. Let \( F_{n} \) and \( F_{e} \) be the nuclear fo.... | 1:28 | 0 | |
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| 2024-01-30 | In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun c.... | 1:11 | 0 | |
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| 2024-01-30 | An electron is moving with speed \( \frac{2 c}{5}(c= \) speed of light). If its de-Broglie wavel.... | 1:41 | 0 | |
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| 2024-01-30 | Which one of the following statements is not true about de-Broglie waves?.... | 1:46 | 1 | |
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| 2024-01-30 | For an alpha particle, accelerated through a potential difference \( V \), wavelength (in \( A \.... | 2:18 | 4 | Let's Play |
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| 2024-01-30 | A proton is accelerated through \( 225 \mathrm{~V} \). Its de Broglie wavelength is.... | 1:33 | 1 | |
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| 2024-01-30 | Ultraviolet light of wavelength \( 66.26 \mathrm{~nm} \) and intensity \( 2 \mathrm{~W} / \mathr.... | 2:52 | 1 | |
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| 2024-01-30 | In photoelectric effect, the slope of stopping potential versus frequency of incident light for .... | 1:31 | 0 | |
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