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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.
| 6551. |
Ratio of masses of proton and electron is [BHU 1998] |
| A. | Infinite |
| B. | \[1.8\times {{10}^{3}}\] |
| C. | 1.8 |
| D. | None of these |
| Answer» C. 1.8 | |
| 6552. |
The ratio of specific charge of a proton and an \[\alpha \]-particle is [MP PET 1999] |
| A. | 2 : 1 |
| B. | 1 : 2 |
| C. | 1 : 4 |
| D. | 1 : 1 |
| Answer» B. 1 : 2 | |
| 6553. |
The mass of 1 mole of electrons is [Pb. CET 2004] |
| A. | \[9.1\times {{10}^{-28}}g\] |
| B. | \[1.008\,mg\] |
| C. | \[0.55\,mg\] |
| D. | \[9.1\times {{10}^{-27}}g\] |
| Answer» D. \[9.1\times {{10}^{-27}}g\] | |
| 6554. |
The average distance of an electron in an atom from its nucleus is of the order of [MP PET 1996] |
| A. | \[{{10}^{6}}m\] |
| B. | \[{{10}^{-6}}m\] |
| C. | \[{{10}^{-10}}m\] |
| D. | \[{{10}^{-15}}m\] |
| Answer» D. \[{{10}^{-15}}m\] | |
| 6555. |
The mass of a mol of proton and electron is |
| A. | \[6.023\times {{10}^{23}}g\] |
| B. | \[1.008g\] and \[0.55mg\] |
| C. | \[9.1\times {{10}^{-28}}kg\] |
| D. | \[2gm\] |
| Answer» C. \[9.1\times {{10}^{-28}}kg\] | |
| 6556. |
One would expect proton to have very large [Pb. CET 2004] |
| A. | Ionization potential |
| B. | Radius |
| C. | Charge |
| D. | Hydration energy |
| Answer» E. | |
| 6557. |
The nature of anode rays depends upon [MP PET 2004] |
| A. | Nature of electrode |
| B. | Nature of residual gas |
| C. | Nature of discharge tube |
| D. | All the above |
| Answer» C. Nature of discharge tube | |
| 6558. |
The minimum real charge on any particle which can exist is [RPMT 2000] |
| A. | \[1.6\times {{10}^{-19}}\,Coulomb\] |
| B. | \[1.6\times {{10}^{-10}}\,Coulomb\] |
| C. | \[4.8\times {{10}^{-10}}\,Coulomb\] |
| D. | Zero |
| Answer» B. \[1.6\times {{10}^{-10}}\,Coulomb\] | |
| 6559. |
Proton was discovered by [AFMC 2004] |
| A. | Chadwick |
| B. | Thomson |
| C. | Goldstein |
| D. | Bohr |
| Answer» D. Bohr | |
| 6560. |
Which one of the following pairs is not correctly matched [MP PET 2002] |
| A. | Rutherford-Proton |
| B. | J.J. Thomsom-Electron |
| C. | J.H. Chadwick-Neutron |
| D. | Bohr-Isotope |
| Answer» E. | |
| 6561. |
Which phrase would be incorrect to use [AMU (Engg.) 1999] |
| A. | A molecular of a compound |
| B. | A molecule of an element |
| C. | An atom of an element |
| D. | None of these |
| Answer» C. An atom of an element | |
| 6562. |
Cathode rays have [CPMT 1982] |
| A. | Mass only |
| B. | Charge only |
| C. | No mass and charge |
| D. | Mass and charge both |
| Answer» E. | |
| 6563. |
Neutron is a fundamental particle carrying [CPMT 1990] |
| A. | A charge of +1 unit and a mass of 1 unit |
| B. | No charge and a mass of 1 unit |
| C. | No charge and no mass |
| D. | A charge of ?1 and a mass of 1 unit |
| Answer» C. No charge and no mass | |
| 6564. |
Neutron possesses [CPMT 1982] |
| A. | Positive charge |
| B. | Negative charge |
| C. | No charge |
| D. | All are correct |
| Answer» D. All are correct | |
| 6565. |
The radius of an atom is of the order of [AMU 1982; IIT 1985; MP PMT 1995] |
| A. | \[{{10}^{-10}}cm\] |
| B. | \[{{10}^{-13}}cm\] |
| C. | \[{{10}^{-15}}cm\] |
| D. | \[{{10}^{-8}}cm\] |
| Answer» E. | |
| 6566. |
Anode rays were discovered by [DPMT 1985] |
| A. | Goldstein |
| B. | J. Stoney |
| C. | Rutherford |
| D. | J.J. Thomson |
| Answer» B. J. Stoney | |
| 6567. |
Cathode rays are made up of [AMU 1983] |
| A. | Positively charged particles |
| B. | Negatively charged particles |
| C. | Neutral particles |
| D. | None of these |
| Answer» C. Neutral particles | |
| 6568. |
Which is correct statement about proton [CPMT 1979; MP PMT 1985; NCERT 1985; MP PET 1999] |
| 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 | |
| 6569. |
The nucleus of helium contains [CPMT 1972; DPMT 1982] |
| A. | Four protons |
| B. | Four neutrons |
| C. | Two neutrons and two protons |
| D. | Four protons and two electrons |
| Answer» D. Four protons and two electrons | |
| 6570. |
Penetration power of proton is [BHU 1985; CPMT 1982, 88] |
| A. | More than electron |
| B. | Less than electron |
| C. | More than neutron |
| D. | None |
| Answer» C. More than neutron | |
| 6571. |
Heaviest particle is [DPMT 1983; MP PET 1999] |
| A. | Meson |
| B. | Neutron |
| C. | Proton |
| D. | Electron |
| Answer» C. Proton | |
| 6572. |
Number of neutron in \[{{C}^{12}}\] is [BCECE 2005] |
| A. | 6 |
| B. | 7 |
| C. | 8 |
| D. | 9 |
| Answer» B. 7 | |
| 6573. |
Cathode rays are [JIPMER 1991; NCERT 1976] |
| A. | Protons |
| B. | Electrons |
| C. | Neutrons |
| D. | \[\alpha \]-particles |
| Answer» C. Neutrons | |
| 6574. |
The order of density in nucleus is [NCERT 1981, CPMT 1981, 2003] |
| A. | \[{{10}^{8}}kg/cc\] |
| B. | \[{{10}^{-8}}kg/cc\] |
| C. | \[{{10}^{-9}}kg/cc\] |
| D. | \[{{10}^{12}}kg/cc\] |
| Answer» E. | |
| 6575. |
The fundamental particles present in the nucleus of an atom are [CPMT 1983, 84] |
| A. | Alpha particles and electrons |
| B. | Neutrons and protons |
| C. | Neutrons and electrons |
| D. | Electrons, neutrons and protons |
| Answer» C. Neutrons and electrons | |
| 6576. |
The discovery of neutron becomes very late because [CPMT 1987; AIIMS 1998] |
| A. | Neutrons are present in nucleus |
| B. | Neutrons are highly unstable particles |
| C. | Neutrons are chargeless |
| D. | Neutrons do not move |
| Answer» D. Neutrons do not move | |
| 6577. |
A neutral atom (Atomic no. > 1) consists of [CPMT 1982] |
| A. | Only protons |
| B. | Neutrons + protons |
| C. | Neutrons + electrons |
| D. | Neutron + proton + electron |
| Answer» E. | |
| 6578. |
Which of the following would have a permanent dipole moment [CBSE PMT 2005] |
| A. | \[B{{F}_{3}}\] |
| B. | \[Si{{F}_{4}}\] |
| C. | \[S{{F}_{4}}\] |
| D. | \[Xe{{F}_{4}}\] |
| Answer» D. \[Xe{{F}_{4}}\] | |
| 6579. |
Which bond angle \[\theta \]would result in the maximum dipole moment for the triatomic molecule \[YXY\] [AIIMS 1980] |
| A. | \[\theta ={{90}^{o}}\] |
| B. | \[\theta ={{120}^{o}}\] |
| C. | \[\theta ={{150}^{o}}\] |
| D. | \[\theta ={{180}^{o}}\] |
| Answer» B. \[\theta ={{120}^{o}}\] | |
| 6580. |
Which of the following compounds possesses the dipole moment [NCERT 1978; EAMCET 1983; MP PMT 1995] |
| A. | Water |
| B. | Boron trifluoride |
| C. | Benzene |
| D. | Carbon tetrachloride |
| Answer» B. Boron trifluoride | |
| 6581. |
Which of the following molecules will show dipole moment [NCERT 1972, 74; DPMT 1985] |
| A. | Methane |
| B. | Carbon tetrachloride |
| C. | Chloroform |
| D. | Carbon dioxide |
| Answer» D. Carbon dioxide | |
| 6582. |
Which of the following will show least dipole character [NCERT 1975; Kurukshetra CEE 1998] |
| A. | Water |
| B. | Ethanol |
| C. | Ethane |
| D. | Ether |
| Answer» D. Ether | |
| 6583. |
The unequal sharing of bonded pair of electrons between two atoms in a molecule causes [EAMCET 1986] |
| A. | Dipole |
| B. | Radical formation |
| C. | Covalent bond |
| D. | Decomposition of molecule |
| Answer» B. Radical formation | |
| 6584. |
If HCl molecule is completely polarized, so expected value of dipole moment is 6.12D (deby), but experimental value of dipole moment is 1.03D. Calculate the percentage ionic character [Kerala CET 2005] |
| A. | 17 |
| B. | 83 |
| C. | 50 |
| D. | Zero |
| E. | 90 |
| Answer» B. 83 | |
| 6585. |
Dipole moment is shown by [IIT 1986] |
| A. | 1, 4-dichlorobenzene |
| B. | \[cis\] 1, 2-dichloroethene |
| C. | \[trans\]1, 2-dichloroethene |
| D. | \[trans\]1, 2-dichloro-2-pentene |
| Answer» C. \[trans\]1, 2-dichloroethene | |
| 6586. |
Identify the non-polar molecule in the set of compounds given : \[HCl,\,HF,\,{{H}_{2}},\,HBr\] [UPSEAT 2004] |
| A. | \[{{H}_{2}}\] |
| B. | \[HCl\] |
| C. | \[HF,\,HBr\] |
| D. | \[HBr\] |
| Answer» B. \[HCl\] | |
| 6587. |
Which of the following is non-polar [DCE 2002] |
| A. | \[PC{{l}_{5}}\] |
| B. | \[PC{{l}_{3}}\] |
| C. | \[S{{F}_{6}}\] |
| D. | \[I{{F}_{7}}\] |
| Answer» D. \[I{{F}_{7}}\] | |
| 6588. |
Which of the following is a polar compound [Pb. CET 2000] |
| A. | \[HCl\] |
| B. | \[{{H}_{2}}Se\] |
| C. | \[C{{H}_{4}}\] |
| D. | \[HI\] |
| Answer» B. \[{{H}_{2}}Se\] | |
| 6589. |
Which of the following has no dipole moment [DCE 2002] |
| A. | \[C{{O}_{2}}\] |
| B. | \[S{{O}_{3}}\] |
| C. | \[{{O}_{3}}\] |
| D. | \[{{H}_{2}}O\] |
| Answer» B. \[S{{O}_{3}}\] | |
| 6590. |
Which molecule has the largest dipole moment [CPMT 1991] |
| A. | \[HCl\] |
| B. | \[HI\] |
| C. | \[HBr\] |
| D. | \[HF\] |
| Answer» E. | |
| 6591. |
In a polar molecule, the ionic charge is \[4.8\times {{10}^{-10}}\] e.s.u. If the inter ionic distance is one Å unit, then the dipole moment is [MH CET 2003] |
| A. | 41.8 debye |
| B. | 4.18 debye |
| C. | 4.8 debye |
| D. | 0.48 debye |
| Answer» D. 0.48 debye | |
| 6592. |
\[{{N}_{2}}\] is less reactive than \[C{{N}^{-}}\]due to [UPSEAT 2003] |
| A. | Presence of more electrons in orbitals |
| B. | Absence of dipole moment |
| C. | Difference in spin quantum no |
| D. | None of these |
| Answer» C. Difference in spin quantum no | |
| 6593. |
The dipole moment is zero for the molecule [IIT 1989; MP PMT 2002] |
| A. | Ammonia |
| B. | Boron trifluoride |
| C. | Sulphur dioxide |
| D. | Water |
| Answer» C. Sulphur dioxide | |
| 6594. |
Which molecule has zero dipole moment [UPSEAT 2001] |
| A. | \[{{H}_{2}}O\] |
| B. | AgI |
| C. | \[PbS{{O}_{4}}\] |
| D. | HBr |
| Answer» C. \[PbS{{O}_{4}}\] | |
| 6595. |
Which shows the least dipole moment [UPSEAT 2001; DPMT 1982] |
| A. | \[CC{{l}_{4}}\] |
| B. | \[CHC{{l}_{3}}\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}OH\] |
| D. | \[C{{H}_{3}}COC{{H}_{3}}\] |
| Answer» B. \[CHC{{l}_{3}}\] | |
| 6596. |
Non-polar solvent is [RPET 2000] |
| A. | Dimethyl sulphoxide |
| B. | Carbon tetrachloride |
| C. | Ammonia |
| D. | Ethyl alcohol |
| Answer» C. Ammonia | |
| 6597. |
Which molecule does not show zero dipole moment [RPET 1997, 99] |
| A. | \[B{{F}_{3}}\] |
| B. | \[N{{H}_{3}}\] |
| C. | \[CC{{l}_{4}}\] |
| D. | \[C{{H}_{4}}\] |
| Answer» C. \[CC{{l}_{4}}\] | |
| 6598. |
Fluorine is more electronegative than either boron or phosphorus. What conclusion can be drawn from the fact that \[B{{F}_{3}}\] has no dipole moment but \[P{{F}_{3}}\] does [Pb. PMT 1998] |
| A. | \[B{{F}_{3}}\]is not spherically symmetrical but \[P{{F}_{3}}\] is |
| B. | \[B{{F}_{3}}\]molecule must be linear |
| C. | The atomic radius of \[P\] is larger than the atomic radius of \[B\] |
| D. | The \[B{{F}_{3}}\] molecule must be planar triangular |
| Answer» E. | |
| 6599. |
Which of the following has zero dipole moment [CPMT 1997; AFMC 1998; CBSE PMT 2001] |
| A. | \[C{{H}_{2}}C{{l}_{2}}\] |
| B. | \[C{{H}_{4}}\] |
| C. | \[N{{H}_{3}}\] |
| D. | \[P{{H}_{3}}\] |
| Answer» C. \[N{{H}_{3}}\] | |
| 6600. |
Which of the following molecules does not possess a permanent dipole moment [CBSE PMT 1994] |
| A. | \[{{H}_{2}}S\] |
| B. | \[S{{O}_{2}}\] |
| C. | \[C{{S}_{2}}\] |
| D. | \[S{{O}_{3}}\] |
| Answer» D. \[S{{O}_{3}}\] | |