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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.
| 1351. |
Choose the element which is not radioactive [CPMT 1988] |
| A. | \[Cm\] |
| B. | \[No\] |
| C. | \[Mo\] |
| D. | \[Md\] |
| Answer» D. \[Md\] | |
| 1352. |
X-rays are produced due to [JIPMER 2002] |
| A. | Bombarding of electrons on solids |
| B. | Bombarding of a-particle on solids |
| C. | Bombarding of g-rays on solids |
| D. | Bombarding of neutron on solids |
| Answer» B. Bombarding of a-particle on solids | |
| 1353. |
b-particle is emitted in radioactivity by [AIEEE 2002; MP PMT 2004] |
| A. | Conversion of proton to neutron |
| B. | Form outermost orbit |
| C. | Conversion of neutron to proton |
| D. | b-particle is not emitted |
| Answer» D. b-particle is not emitted | |
| 1354. |
\[\alpha \]-rays have [CPMT 1973, 78; NCERT 1977] |
| A. | Positive charge |
| B. | Negative charge |
| C. | No charge |
| D. | Sometimes positive charge and sometimes negative charge |
| Answer» B. Negative charge | |
| 1355. |
Penetrating power of a-particle is [MP PMT 2002] |
| A. | More than g-rays |
| B. | More than b-rays |
| C. | Less than b-rays |
| D. | None of these |
| Answer» D. None of these | |
| 1356. |
Which of the following is radioactive element [CPMT 1988] |
| A. | Sulphur |
| B. | Polonium |
| C. | Tellurium |
| D. | Selenium |
| Answer» C. Tellurium | |
| 1357. |
The \[\alpha \]-particle is identical with [CPMT 1972, 82, 86; BHU 1984; MP PMT 1990, 91, 93; MP PET 1999] |
| A. | Helium nucleus |
| B. | Hydrogen nucleus |
| C. | Electron |
| D. | Proton |
| Answer» B. Hydrogen nucleus | |
| 1358. |
If by mistake some radioactive substance gets inside the human body, then from the point of view of radiation damage, the most harmful will be the one which emits [DPMT 1986] |
| A. | \[\gamma \]-rays |
| B. | Neutrons |
| C. | \[\beta \]-particles |
| D. | \[\alpha \]-particles |
| Answer» B. Neutrons | |
| 1359. |
Which is the correct statement [CPMT 1971] |
| A. | Isotopes are always radioactive |
| B. | \[\beta \]-rays are always negatively charged particles |
| C. | \[\alpha \]-rays are always negatively charged particles |
| D. | \[\gamma \]-rays can be deflected in magnetic field |
| Answer» C. \[\alpha \]-rays are always negatively charged particles | |
| 1360. |
Which of the following does not contain material particles [BHU 2002] |
| A. | Alpha rays |
| B. | Beta rays |
| C. | Gamma rays |
| D. | Canal rays |
| Answer» D. Canal rays | |
| 1361. |
Correct configuration of \[F{{e}^{+3}}\] [26] is [CPMT 1994; BHU 1995; KCET 1992] |
| A. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{5}}\] |
| B. | \[1{{s}^{2}},2{{s}^{2}}s{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{3}},4{{s}^{2}}\] |
| C. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{6}},4{{s}^{2}}\] |
| D. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{5}},4{{s}^{1}}\] |
| Answer» B. \[1{{s}^{2}},2{{s}^{2}}s{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{3}},4{{s}^{2}}\] | |
| 1362. |
The set of quantum numbers not applicable for an electron in an atom is [MNR 1994] |
| A. | \[n=1,\,l=1,\,{{m}_{l}}=1,\,{{m}_{s}}=+1/2\] |
| B. | \[n=1,\,l=0,\,{{m}_{l}}=0,\,{{m}_{s}}=+1/2\] |
| C. | \[n=1,\,l=0,\,{{m}_{l}}=0,\,{{m}_{s}}=-1/2\] |
| D. | \[n=2,\,l=0,\,{{m}_{l}}=0,\,{{m}_{s}}=+1/2\] |
| Answer» B. \[n=1,\,l=0,\,{{m}_{l}}=0,\,{{m}_{s}}=+1/2\] | |
| 1363. |
Which of the following statements is not correct for an electron that has the quantum numbers \[n=4\] and \[m=2\] [MNR 1993] |
| A. | The electron may have the quantum number \[s=+\frac{1}{2}\] |
| B. | The electron may have the quantum number \[l=2\] |
| C. | The electron may have the quantum number \[l=3\] |
| D. | The electron may have the quantum number \[l=0,\,1,\,2,\,3\] |
| Answer» E. | |
| 1364. |
Which of the following represents the correct sets of the four quantum numbers of a \[4d\] electron [MNR 1992; UPSEAT 2001; J&K CET 2005] |
| A. | \[4,\,3,\,2,\,\frac{1}{2}\] |
| B. | 4, 2, 1, 0 |
| C. | \[4,\,3,\,-2,\,+\frac{1}{2}\] |
| D. | \[4,\,2,\,1,\,-\frac{1}{2}\] |
| Answer» E. | |
| 1365. |
The order of filling of electrons in the orbitals of an atom will be [CBSE PMT 1991] |
| A. | \[3d,\,4s,\,4p,\,4d,\,5s\] |
| B. | \[4s,\,3d,\,4p,\,5s,\,4d\] |
| C. | \[5s,\,4p,\,3d,\,4d,\,5s\] |
| D. | \[3d,\,4p,\,4s,\,4d,\,5s\] |
| Answer» C. \[5s,\,4p,\,3d,\,4d,\,5s\] | |
| 1366. |
For azimuthal quantum number \[l=3\], the maximum number of electrons will be [CBSE PMT 1991; EAMCET 1991; RPMT 2002; CBSE PMT 2002] |
| A. | 2 |
| B. | 6 |
| C. | 0 |
| D. | 14 |
| Answer» E. | |
| 1367. |
An ion has 18 electrons in the outermost shell, it is [CBSE PMT 1990] |
| A. | \[C{{u}^{+}}\] |
| B. | \[T{{h}^{4+}}\] |
| C. | \[C{{s}^{+}}\] |
| D. | \[{{K}^{+}}\] |
| Answer» B. \[T{{h}^{4+}}\] | |
| 1368. |
How many electrons can be accommodated in a sub-shell for which \[n=3,\,l=1\] [CBSE PMT 1990] |
| A. | 8 |
| B. | 6 |
| C. | 18 |
| D. | 32 |
| Answer» C. 18 | |
| 1369. |
Correct set of four quantum numbers for valence electron of rubidium (Z = 37) is [IIT 1984; JIPMER 1999; UPSEAT 2003] |
| A. | \[5,\,0,\,0,\,+\frac{1}{2}\] |
| B. | \[5,\,1,\,0,\,+\frac{1}{2}\] |
| C. | \[5,\,1,\,1,\,+\frac{1}{2}\] |
| D. | \[6,\,0,\,0,\,+\,\frac{1}{2}\] |
| Answer» B. \[5,\,1,\,0,\,+\frac{1}{2}\] | |
| 1370. |
When the azimuthal quantum number has a value of \[l=1\], the shape of the orbital is [MP PET 1993] |
| A. | Unsymmetrical |
| B. | Spherically symmetrical |
| C. | Dumb-bell |
| D. | Complicated |
| Answer» D. Complicated | |
| 1371. |
The principal quantum number represents [CPMT 1991] |
| A. | Shape of an orbital |
| B. | Distance of electron from nucleus |
| C. | Number of electrons in an orbit |
| D. | Number of orbitals in an orbit |
| Answer» C. Number of electrons in an orbit | |
| 1372. |
The electronic configuration (outermost) of \[M{{n}^{+2}}\] ion (atomic number of \[Mn=25\]) in its ground state is [MP PET 1993] |
| A. | \[3{{d}^{5}},4{{s}^{0}}\] |
| B. | \[3{{d}^{4}},4{{s}^{1}}\] |
| C. | \[3{{d}^{3}},4{{s}^{2}}\] |
| D. | \[3{{d}^{2}},4{{s}^{2}}4{{p}^{2}}\] |
| Answer» B. \[3{{d}^{4}},4{{s}^{1}}\] | |
| 1373. |
The shape of \[p\]-orbital is [MP PMT 1993] |
| A. | Elliptical |
| B. | Spherical |
| C. | Dumb-bell |
| D. | Complex geometrical |
| Answer» D. Complex geometrical | |
| 1374. |
There is no difference between a \[2p\] and a \[3p\]orbital regarding [BHU 1981] |
| A. | Shape |
| B. | Size |
| C. | Energy |
| D. | Value of \[n\] |
| Answer» B. Size | |
| 1375. |
The electronic configuration of chromium is [MP PMT 1993; MP PET 1995; BHU 2001; BCECE 2005] |
| A. | \[[Ne]3{{s}^{2}}3{{p}^{6}}3{{d}^{4}},4{{s}^{2}}\] |
| B. | \[[Ne]3{{s}^{2}}3{{p}^{6}}3{{d}^{5}},4{{s}^{1}}\] |
| C. | \[[Ne]3{{s}^{2}}3{{p}^{6}},4{{s}^{2}}4{{p}^{4}}\] |
| D. | \[[Ne]3{{s}^{2}}3{{p}^{6}}3{{d}^{1}},4{{s}^{2}}4{{p}^{3}}\] |
| Answer» C. \[[Ne]3{{s}^{2}}3{{p}^{6}},4{{s}^{2}}4{{p}^{4}}\] | |
| 1376. |
The total number of electrons that can be accommodated in all the orbitals having principal quantum number 2 and azimuthal quantum number 1 is [CPMT 1971, 89, 91] |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 1377. |
Electronic configuration of \[C\] is [CPMT 1975] |
| A. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{2}}\] |
| B. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{3}}\] |
| C. | \[1{{s}^{2}},2{{s}^{2}}\] |
| D. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}}\] |
| Answer» B. \[1{{s}^{2}},2{{s}^{2}}2{{p}^{3}}\] | |
| 1378. |
If an electron has spin quantum number of \[+\frac{1}{2}\] and a magnetic quantum number of \[-1\], it cannot be presented in an [CBSE PMT 1989; UPSEAT 2001] |
| A. | \[d\]-orbital |
| B. | \[f\]-orbital |
| C. | \[p\]-orbital |
| D. | \[s\]-orbital |
| Answer» E. | |
| 1379. |
Principal, azimuthal and magnetic quantum numbers are respectively related to [CPMT 1988; AIIMS 1999] |
| A. | Size, shape and orientation |
| B. | Shape, size and orientation |
| C. | Size, orientation and shape |
| D. | None of the above |
| Answer» B. Shape, size and orientation | |
| 1380. |
Krypton \[{{(}_{36}}Kr)\] has the electronic configuration \[{{(}_{18}}Ar)\] \[4{{s}^{2}},3{{d}^{10}},4{{p}^{6}}\]. The \[{{37}^{th}}\] electron will go into which one of the following sub-levels [CBSE PMT 1989; CPMT 1989; EAMCET 1991] |
| A. | \[4f\] |
| B. | \[4d\] |
| C. | \[3p\] |
| D. | \[5s\] |
| Answer» E. | |
| 1381. |
Which element is represented by the following electronic configuration [MP PMT 1987] |
| A. | Nitrogen |
| B. | Oxygen |
| C. | Fluorine |
| D. | Neon |
| Answer» D. Neon | |
| 1382. |
How many electrons can be fit into the orbitals that comprise the \[{{3}^{rd}}\] quantum shell \[n=3\] [MP PMT 1986, 87; Orissa JEE 1997] |
| A. | 2 |
| B. | 8 |
| C. | 18 |
| D. | 32 |
| Answer» D. 32 | |
| 1383. |
Which one is the electronic configuration of \[F{{e}^{+2}}\] [MADT Bihar 1982; AIIMS 1989] |
| A. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{6}}\] |
| B. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{4}},4{{s}^{2}}\] |
| C. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{5}},4{{s}^{1}}\] |
| D. | None of these |
| Answer» B. \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{4}},4{{s}^{2}}\] | |
| 1384. |
\[C{{u}^{2+}}\] will have the following electronic configuration [MP PMT 1985] |
| A. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}}\] |
| B. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{9}},4{{s}^{1}}\] |
| C. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{9}}\] |
| D. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{1}}\] |
| Answer» D. \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{1}}\] | |
| 1385. |
In a potassium atom, electronic energy levels are in the following order [EAMCET 1979; DPMT 1991] |
| A. | \[4s>3d\] |
| B. | \[4s>4p\] |
| C. | \[4s<3d\] |
| D. | \[4s<3p\] |
| Answer» D. \[4s<3p\] | |
| 1386. |
\[Fe\] (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 | |
| 1387. |
When \[3d\] orbital is complete, the new electron will enter the [EAMCET 1980; MP PMT 1995] |
| A. | \[4p\]-orbital |
| B. | \[4f\]-orbital |
| C. | \[4s\]-orbital |
| D. | \[4d\]-orbital |
| Answer» B. \[4f\]-orbital | |
| 1388. |
The shape of \[s\]-orbital is [NCERT 1978I] |
| A. | Pyramidal |
| B. | Spherical |
| C. | Tetrahedral |
| D. | Dumb-bell shaped |
| Answer» C. Tetrahedral | |
| 1389. |
Which of the following represents the electronic configuration of an element with atomic number 17 [AMU 1982] |
| A. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{1}}3{{p}^{6}}\] |
| B. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{4}},4{{s}^{1}}\] |
| C. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{5}}\] |
| D. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{1}}3{{p}^{4}},4{{s}^{2}}\] |
| Answer» D. \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{1}}3{{p}^{4}},4{{s}^{2}}\] | |
| 1390. |
In a multi-electron atom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields [AIEEE 2005] (1) \[n=1,\,l=0,\,m=0\] (2) \[n=2,\,l=0,\,m=0\] (3) \[n=2,\,l=1,\,m=1\] (4) \[n=3,\,l=2,\,m=0\] (5) \[n=3,\,l=2,\,m=0\] |
| A. | (1) and (2) |
| B. | (2) and (3) |
| C. | (3) and (4) |
| D. | (4) and (5) |
| Answer» E. | |
| 1391. |
The electronic configuration of an element with atomic number 7 i.e. nitrogen atom is [CPMT 1982, 84, 87] |
| A. | \[1{{s}^{2}},2{{s}^{1}},2p_{x}^{3}\] |
| B. | \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{2}2p_{y}^{1}\] |
| C. | \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{1}2p_{y}^{1}2p_{z}^{1}\] |
| D. | \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{1}2p_{y}^{2}\] |
| Answer» D. \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{1}2p_{y}^{2}\] | |
| 1392. |
The magnetic quantum number for valency electrons of sodium is [CPMT 1988; MH CET 1999] |
| A. | 3 |
| B. | 2 |
| C. | 1 |
| D. | 0 |
| Answer» E. | |
| 1393. |
Elements upto atomic number 103 have been synthesized and studied. If a newly discovered element is found to have an atomic number 106, its electronic configuration will be [AIIMS 1980] |
| A. | \[[Rn]5{{f}^{14}},6{{d}^{4}},7{{s}^{2}}\] |
| B. | \[[Rn]5{{f}^{14}},6{{d}^{1}},7{{s}^{2}}7{{p}^{3}}\] |
| C. | \[[Rn]5{{f}^{14}},6{{d}^{6}},7{{s}^{0}}\] |
| D. | \[[Rn]5{{f}^{14}},6{{d}^{5}},7{{s}^{1}}\] |
| Answer» E. | |
| 1394. |
Which of the following ions is not having the configuration of neon |
| A. | \[{{F}^{-}}\] |
| B. | \[M{{g}^{+2}}\] |
| C. | \[N{{a}^{+}}\] |
| D. | \[C{{l}^{-}}\] |
| Answer» E. | |
| 1395. |
For \[n=3\] energy level, the number of possible orbitals (all kinds) are [BHU 1981; CPMT 1985; MP PMT 1995] |
| A. | 1 |
| B. | 3 |
| C. | 4 |
| D. | 9 |
| Answer» E. | |
| 1396. |
Which one of the following configuration represents a noble gas [CPMT 1983, 89, 93; NCERT 1973; MP PMT 1989; DPMT 1984] |
| A. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}\] |
| B. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{1}}\] |
| C. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}}\] |
| D. | \[1{{s}^{2}},2{{s}^{2}}s{{p}^{6}},3{{s}^{2}}3{{p}^{6}},4{{s}^{2}}\] |
| Answer» D. \[1{{s}^{2}},2{{s}^{2}}s{{p}^{6}},3{{s}^{2}}3{{p}^{6}},4{{s}^{2}}\] | |
| 1397. |
For \[d\]electrons, the azimuthal quantum number is [MNR 1983; CPMT 1984] |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 1398. |
Pauli's exclusion principle states that [MNR 1983; AMU 1984] |
| A. | Two electrons in the same atom can have the same energy |
| B. | Two electrons in the same atom cannot have the same spin |
| C. | The electrons tend to occupy different orbitals as far as possible |
| D. | Electrons tend to occupy lower energy orbitals preferentially |
| E. | None of the above |
| Answer» F. | |
| 1399. |
The number of orbitals in \[d\] sub-shell is [MNR 1981] |
| A. | 1 |
| B. | 3 |
| C. | 5 |
| D. | 7 |
| Answer» D. 7 | |
| 1400. |
The electronic configuration of copper \[{{(}_{29}}Cu)\] is [DPMT 1983; BHU 1980; AFMC 1981; CBSE PMT 1991; MP PMT 1995] |
| A. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{9}},4{{s}^{2}}\] |
| B. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}},4{{s}^{1}}\] |
| C. | \[1{{s}^{2}}.2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}},4{{s}^{2}}4{{p}^{6}}\] |
| D. | \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}}\] |
| Answer» C. \[1{{s}^{2}}.2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}},4{{s}^{2}}4{{p}^{6}}\] | |