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MCQOPTIONS
This section includes 11242 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 10351. |
Last line of Lyman series for H-atom has wavelength \[{{\lambda }_{1}}\overset{o}{\mathop{A}}\,,\] \[{{2}^{nd}}\] line of Balmer series has wavelength \[{{\lambda }_{2}}\overset{o}{\mathop{A}}\,\] then |
| A. | \[\frac{16}{{{\lambda }_{1}}}=\frac{9}{{{\lambda }_{2}}}\] |
| B. | \[\frac{16}{{{\lambda }_{2}}}=\frac{9}{{{\lambda }_{1}}}\] |
| C. | \[\frac{4}{{{\lambda }_{1}}}=\frac{1}{{{\lambda }_{2}}}\] |
| D. | \[\frac{16}{{{\lambda }_{1}}}=\frac{3}{{{\lambda }_{2}}}\] |
| Answer» C. \[\frac{4}{{{\lambda }_{1}}}=\frac{1}{{{\lambda }_{2}}}\] | |
| 10352. |
Magnetic moments of \[Cr(Z=24),\,Mn(Z=25)\] and \[Fe(Z=26)\] are \[x,\,y\] and \[z\] respectively. Hence, |
| A. | \[x=y=z\] |
| B. | \[x=y<z\] |
| C. | \[x<y<z\] |
| D. | \[x>y>z\] |
| Answer» E. | |
| 10353. |
Naturally occurring boron consists of two isotopes whose atomic weights are 10.01 and 11.01. The atomic weight of natural boron is 10.81. Calculate the percentage of each isotope in natural boron. |
| A. | 20, 80 |
| B. | 30, 70 |
| C. | 10, 90 |
| D. | 15, 85 |
| Answer» B. 30, 70 | |
| 10354. |
Photoelectric emission is observed from a surface for frequencies \[{{v}_{1}}\] and \[{{v}_{2}}\] of the incident radiation\[({{v}_{1}}-{{v}_{2}})\]. If the maximum kinetic energies of the photoelectrons in the two cases are in the ratio 1: k then the threshold frequency \[{{v}_{1}}\]is given by |
| A. | \[\frac{{{v}_{2}}-{{v}_{1}}}{k-1}\] |
| B. | \[\frac{k{{v}_{1}}-{{v}_{2}}}{k-1}\] |
| C. | \[\frac{k{{v}_{2}}-{{v}_{1}}}{k-1}\] |
| D. | \[\frac{{{v}_{2}}-{{v}_{1}}}{k}\] |
| Answer» C. \[\frac{k{{v}_{2}}-{{v}_{1}}}{k-1}\] | |
| 10355. |
Which of the following sets of quantum numbers is not permitted? |
| A. | \[n=3,\,l=3,\,m=0,\,s=+1/2\] |
| B. | \[n=3,\,l=2,\,m=+2,\,s=-1/2\] |
| C. | \[n=3,\,l=1,\,m=-2,\,s=-1/2\] |
| D. | \[n=3,\,l=0,\,m=0,\,s=+1/2\] |
| Answer» B. \[n=3,\,l=2,\,m=+2,\,s=-1/2\] | |
| 10356. |
Table-tennis ball has a mass 10 g and a speed of 90 m/s. If speed can be measured within an accuracy of 4% what will be the uncertainity in speed and position |
| A. | \[1.58\times {{10}^{-34}}\,m\] |
| B. | \[1.46\times {{10}^{-33}}\,m\] |
| C. | \[2.45\times {{10}^{-24}}\,m\] |
| D. | \[3.48\times {{10}^{-31}}\,m\] |
| Answer» C. \[2.45\times {{10}^{-24}}\,m\] | |
| 10357. |
The radius of the nucleus is related to the mass number \[A\] by |
| A. | \[R={{R}_{o}}{{A}^{1/2}}\] |
| B. | \[R={{R}_{o}}A\] |
| C. | \[R={{R}_{o}}{{A}^{2}}\] |
| D. | \[R={{R}_{o}}{{A}^{1/3}}\] |
| Answer» E. | |
| 10358. |
When \[\beta \]-particles are sent through a tin metal foil, most of them go straight through the foil as |
| A. | \[\beta \]-particles are much heavier than electrons |
| B. | \[\beta \]-particles are positively charged |
| C. | Most part of the atom is empty space |
| D. | \[\beta \]-particles move with high velocity |
| Answer» D. \[\beta \]-particles move with high velocity | |
| 10359. |
When atoms are bombarded with alpha particles, only a few in million suffer deflection, others pass out undeflected. This is because |
| A. | The force of repulsion on the moving alpha particle is small |
| B. | The force of attraction on the alpha particle to the oppositely charged electrons is very small |
| C. | There is only one nucleus and large number of electrons |
| D. | The nucleus occupies much smaller volume compared to the volume of the atom |
| Answer» E. | |
| 10360. |
The nitrogen atom has 7 protons and 7 electrons, the nitride ion \[({{N}^{3-}})\]will have |
| A. | 7 protons and 10 electrons |
| B. | 4 protons and 7 electrons |
| C. | 4 protons and 10 electrons |
| D. | 10 protons and 7 electrons |
| Answer» B. 4 protons and 7 electrons | |
| 10361. |
The nucleus of the element \[_{21}{{E}^{45}}\] contains |
| A. | 45 protons and 21 neutrons |
| B. | 21 proto.ns and 24 neutrons |
| C. | 21 protons and 45 neutrons |
| D. | 24 protons and 21 neutrons |
| Answer» C. 21 protons and 45 neutrons | |
| 10362. |
The two electrons in K sub-shell will differ in |
| A. | Principal quantum number |
| B. | Azimuthal quantum number |
| C. | Magnetic quantum number |
| D. | Spin quantum number |
| Answer» E. | |
| 10363. |
If uncertainty in the position of an electron is zero, the uncertainty in its momentum would be |
| A. | Zero |
| B. | \[<\frac{h}{2\lambda }\] |
| C. | \[>\frac{h}{2\lambda }\] |
| D. | Infinite |
| Answer» E. | |
| 10364. |
What is the de-Broglie wavelength associated with the hydrogen electron in its third orbit |
| A. | \[9.96\times {{10}^{-10}}cm\] |
| B. | \[9.96\times {{10}^{-8}}cm\] |
| C. | \[9.96\times {{10}^{4}}cm\] |
| D. | \[9.96\times {{10}^{8}}cm\] |
| Answer» C. \[9.96\times {{10}^{4}}cm\] | |
| 10365. |
Wavelength of spectral line emitted is inversely proportional to |
| A. | Radius |
| B. | Energy |
| C. | Velocity |
| D. | Quantum number |
| Answer» C. Velocity | |
| 10366. |
If electron falls from \[n=3\] to \[n=2\], then emitted energy is |
| A. | \[10.2eV\] |
| B. | \[12.09eV\] |
| C. | \[1.9eV\] |
| D. | \[0.65eV\] |
| Answer» D. \[0.65eV\] | |
| 10367. |
The proton and neutron are collectively called as |
| A. | Deutron |
| B. | Positron |
| C. | Meson |
| D. | Nucleon |
| Answer» E. | |
| 10368. |
Which is correct statement about proton |
| A. | Proton is nucleus of deuterium |
| B. | Proton is ionized hydrogen molecule |
| C. | Proton is ionized hydrogen atom |
| D. | Proton is \[\alpha \]-particle |
| Answer» D. Proton is \[\alpha \]-particle | |
| 10369. |
Orbital angular momentum for a d-electron is |
| A. | \[\frac{6h}{2\pi }\] |
| B. | \[\frac{\sqrt{6}\,h}{2\pi }\] |
| C. | \[\frac{12h}{2\pi }\] |
| D. | \[\frac{\sqrt{12}\,h}{2\pi }\] |
| Answer» C. \[\frac{12h}{2\pi }\] | |
| 10370. |
The energy of an electron of \[2{{p}_{y}}\] orbital is |
| A. | Greater than that of \[2{{p}_{x}}\] orbital |
| B. | Less than that of \[2{{p}_{x}}\] orbital |
| C. | Equal to that of \[2s\] orbital |
| D. | Same as that of \[2{{p}_{z}}\] orbital |
| Answer» E. | |
| 10371. |
The maximum number of electrons which each sub-shell can occupy is |
| A. | \[2{{n}^{2}}\] |
| B. | \[2n\] |
| C. | \[2(2l+1)\] |
| D. | \[(2l+1)\] |
| Answer» D. \[(2l+1)\] | |
| 10372. |
Ions which have the same electronic configuration are those of |
| A. | Lithium and sodium |
| B. | Sodium and potassium |
| C. | Potassium and calcium |
| D. | Oxygen and chlorine |
| Answer» D. Oxygen and chlorine | |
| 10373. |
The number of electrons in the valence shell of calcium is |
| A. | 6 |
| B. | 8 |
| C. | 2 |
| D. | 4 |
| Answer» D. 4 | |
| 10374. |
The number of radial nodes of 3s and 2p orbitals are respectively. |
| A. | 2, 0 |
| B. | 0, 2 |
| C. | 1, 2 |
| D. | 2, 1 |
| Answer» B. 0, 2 | |
| 10375. |
For an electron if the uncertainty in velocity is \[\Delta \nu \], the uncertainty in its position \[(\Delta x)\] is given by |
| A. | \[\frac{hm}{4\pi \Delta \nu }\] |
| B. | \[\frac{4\pi }{hm\Delta \nu }\] |
| C. | \[\frac{h}{4\pi m\Delta \nu }\] |
| D. | \[\frac{4\pi \ m}{h\ .\ \Delta \nu }\] |
| Answer» D. \[\frac{4\pi \ m}{h\ .\ \Delta \nu }\] | |
| 10376. |
The electronic configuration of silver atom in ground state is |
| A. | \[[Kr]3{{d}^{10}}\,4{{s}^{1}}\] |
| B. | \[[Xe]\,4{{f}^{14}}5{{d}^{10}}6{{s}^{1}}\] |
| C. | \[[Kr]\,4{{d}^{10}}5{{s}^{1}}\] |
| D. | \[[Kr]\,4{{d}^{9}}5{{s}^{2}}\] |
| Answer» D. \[[Kr]\,4{{d}^{9}}5{{s}^{2}}\] | |
| 10377. |
Based on the equation: \[\Delta E=-2.0\times {{10}^{-18}}J\left( \frac{1}{n_{2}^{2}}-\frac{1}{n_{1}^{2}} \right)\] the wavelength of the light that must be absorbed to excite hydrogen electron from level n = 1 to level \[n=2\] will be: (\[h=6.625\times {{10}^{-34}}Js\],\[C=3\times {{10}^{8}}m{{s}^{-1}}\]) |
| A. | \[1.325\times {{10}^{-7}}m\] |
| B. | \[1.325\times {{10}^{-10}}m\] |
| C. | \[2.650\times {{10}^{-7}}m\] |
| D. | \[5.300\times {{10}^{-10}}m\] |
| Answer» B. \[1.325\times {{10}^{-10}}m\] | |
| 10378. |
An electron has been excited from the first to the fourth energy state in an atom. Which of the following transitions are possible when the electron comes back to the ground state? |
| A. | \[4\to 1\] |
| B. | \[4\to 2,2\to 1\] |
| C. | \[4\to 3,3\to 2,2\to 1\] |
| D. | All of the above |
| Answer» E. | |
| 10379. |
Let \[{{m}_{p}}\]be the mass of a proton, \[{{m}_{n}}\]that of a neutron, \[{{M}_{1}}\]that of a \[_{10}^{20}Ne\] nucleus and \[{{M}_{2}}\] that of a \[_{20}^{40}Ca\] nucleus. Then |
| A. | \[{{M}_{2}}=2{{M}_{1}}\] |
| B. | \[{{M}_{1}}<10({{m}_{p}}+{{m}_{n}})\] |
| C. | \[{{M}_{2}}>2{{M}_{1}}\] |
| D. | \[{{M}_{1}}={{M}_{2}}\] |
| Answer» B. \[{{M}_{1}}<10({{m}_{p}}+{{m}_{n}})\] | |
| 10380. |
A system irradiated for 10 min. is found to absorb \[3\times {{10}^{18}}\]quanta per sec. If the amount of substance decomposed is\[~3\times {{10}^{-3}}mol\] \[({{N}_{A}}=6\times {{10}^{23}})\]. The quantum efficiency of the reaction is |
| A. | 2.5 |
| B. | 2 |
| C. | 1.5 |
| D. | 1 |
| Answer» E. | |
| 10381. |
Which combinations of quantum numbers, \[n,l,m\] and s for the electron in an atom does not provide a permissible solution of the wave equation? |
| A. | \[3,2,1,+\frac{1}{2}\] |
| B. | \[3,1,1,-\frac{1}{2}\] |
| C. | \[~3,3,1-\frac{1}{2}\] |
| D. | \[3,2,-2,+\frac{1}{2}\] |
| Answer» D. \[3,2,-2,+\frac{1}{2}\] | |
| 10382. |
An electron in an atom jumps in such a way that its kinetic energy changes from x to\[\frac{x}{4}\]. The change in potential energy will be: |
| A. | \[+\frac{3}{2}x\] |
| B. | \[-\frac{3}{8}x\] |
| C. | \[+\frac{3}{4}x\] |
| D. | \[-\frac{3}{4}x\] |
| Answer» B. \[-\frac{3}{8}x\] | |
| 10383. |
In ground state of \[C{{u}^{+}}\]. The no. of shells occupied, subshells, filled orbitals and unpaired electrons respectively are: |
| A. | 4, 8, 15, 0 |
| B. | 3, 6, 15, 1 |
| C. | 3, 6, 14, 0 |
| D. | 4, 7, 14, 2 |
| Answer» D. 4, 7, 14, 2 | |
| 10384. |
The wavelength of \[{{H}_{\alpha }}\] line of Balmer series is X \[\overset{\text{o}}{\mathop{\text{A}}}\,\]. What is the X of\[{{H}_{\beta }}\] line of Balmer series. |
| A. | \[X\frac{108}{80}\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| B. | \[X\frac{80}{108}\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| C. | \[\frac{1}{X}\frac{80}{108}\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| D. | \[\frac{1}{X}\frac{108}{80}\overset{\text{o}}{\mathop{\text{A}}}\,\] |
| Answer» C. \[\frac{1}{X}\frac{80}{108}\overset{\text{o}}{\mathop{\text{A}}}\,\] | |
| 10385. |
Which of the following should be the number of electrons present in \[{{X}^{2+}}\]on the basis of electronic configuration, if the ion \[{{X}^{3-}}\]has 14 protons? |
| A. | 12 |
| B. | 14 |
| C. | 16 |
| D. | 18 |
| Answer» B. 14 | |
| 10386. |
Excited hydrogen atom emits light in the ultraviolet region at\[2.47\times {{10}^{15}}Hz\]. With this frequency, the energy of a single photon is: \[(h=6.63\times {{10}^{-34}}Js)\] |
| A. | \[8.041\times {{10}^{-40}}J\] |
| B. | \[2.680\times {{10}^{-19}}J\] |
| C. | \[1.640\times {{10}^{-18}}J\] |
| D. | \[6.111\times {{10}^{-17}}J\] |
| Answer» D. \[6.111\times {{10}^{-17}}J\] | |
| 10387. |
Azimuthal quantum number for last electron of \[Na\] atom is [BHU 1995] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» E. | |
| 10388. |
The shape of \[p\]-orbital is [MP PMT 1993] |
| A. | Elliptical |
| B. | Spherical |
| C. | Dumb-bell |
| D. | Complex geometrical |
| Answer» D. Complex geometrical | |
| 10389. |
\[Fe\] (atomic number = 26) atom has the electronic arrangement [NCERT 1974; MNR 1980] |
| A. | 2, 8, 8, 8 |
| B. | 2, 8, 16 |
| C. | 2, 8,14, 2 |
| D. | 2, 8, 12, 4 |
| Answer» D. 2, 8, 12, 4 | |
| 10390. |
If the value of azimuthal quantum number is 3, the possible values of magnetic quantum number would be [MP PMT 1987; RPMT 1999; AFMC 2002; KCET 2002] |
| A. | 0, 1, 2, 3 |
| B. | 0, ? 1, ? 2, ? 3 |
| C. | 0, \[\pm \]1, \[\pm \]2, \[\pm \] 3 |
| D. | \[\pm \]1, \[\pm \]2, \[\pm \]3 |
| Answer» D. \[\pm \]1, \[\pm \]2, \[\pm \]3 | |
| 10391. |
The electronic configuration of silver atom in ground state is [CPMT 1984, 93] |
| A. | \[[Kr]3{{d}^{10}}\,4{{s}^{1}}\] |
| B. | \[[Xe]\,4{{f}^{14}}5{{d}^{10}}6{{s}^{1}}\] |
| C. | \[[Kr]\,4{{d}^{10}}5{{s}^{1}}\] |
| D. | \[[Kr]\,4{{d}^{9}}5{{s}^{2}}\] |
| Answer» D. \[[Kr]\,4{{d}^{9}}5{{s}^{2}}\] | |
| 10392. |
When the azimuthal quantum number has a value of \[l=0\], the shape of the orbital is [MP PET 1995] |
| A. | Rectangular |
| B. | Spherical |
| C. | Dumbbell |
| D. | Unsymmetrical |
| Answer» C. Dumbbell | |
| 10393. |
For \[p\]-orbital, the magnetic quantum number has value |
| A. | 2 |
| B. | 4, ? 4 |
| C. | ? 1, 0, +1 |
| D. | 0 |
| Answer» D. 0 | |
| 10394. |
A sub-shell \[l=2\] can take how many electrons [NCERT 1973, 78] |
| A. | 3 |
| B. | 10 |
| C. | 5 |
| D. | 6 |
| Answer» C. 5 | |
| 10395. |
The four quantum numbers of the outermost orbital of \[K\] (atomic no. =19) are [MP PET 1993, 94] |
| A. | \[n=2,\,l=0,\,m=0,\,s=+\frac{1}{2}\] |
| B. | \[n=4,\,l=0,\,m=0,\,s=+\frac{1}{2}\] |
| C. | \[n=3,\,l=1,\,m=1,\,s=+\frac{1}{2}\] |
| D. | \[n=4,\,l=2,\,m=-1,\,s=+\frac{1}{2}\] |
| Answer» C. \[n=3,\,l=1,\,m=1,\,s=+\frac{1}{2}\] | |
| 10396. |
The shape of \[{{d}_{xy}}\] orbital will be |
| A. | Circular |
| B. | Dumb-bell |
| C. | Double dumb-bell |
| D. | Trigonal |
| Answer» D. Trigonal | |
| 10397. |
The number of radial nodes of 3s and 2p orbitals are respectively. [IIT-JEE 2005] |
| A. | 2, 0 |
| B. | 0, 2 |
| C. | 1, 2 |
| D. | 2, 1 |
| Answer» B. 0, 2 | |
| 10398. |
Which set of quantum numbers are not possible from the following |
| A. | \[n=3,\,l=2,\,m=0,\,s=-\frac{1}{2}\] |
| B. | \[n=3,\,l=2,\,m=-2,\,s=-\frac{1}{2}\] |
| C. | \[n=3,\,l=3,\,m=-3,\,s=-\frac{1}{2}\] |
| D. | \[n=3,\,l=0,\,m=0,\,s=-\frac{1}{2}\] |
| Answer» D. \[n=3,\,l=0,\,m=0,\,s=-\frac{1}{2}\] | |
| 10399. |
The two electrons in K sub-shell will differ in [MNR 1988; UPSEAT 1999, 2000; Kerala PMT 2003] |
| A. | Principal quantum number |
| B. | Azimuthal quantum number |
| C. | Magnetic quantum number |
| D. | Spin quantum number |
| Answer» E. | |
| 10400. |
The maximum number of electrons present in an orbit \[l=3\], is [Pb. PMT 2004] |
| A. | 6 |
| B. | 8 |
| C. | 10 |
| D. | 14 |
| Answer» E. | |