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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.
| 9751. |
Atom bomb is based on the principle of [CPMT 1982; BHU 1985] |
| A. | Nuclear fusion |
| B. | Nuclear fission |
| C. | Radioactivity |
| D. | Fusion and fission both |
| Answer» C. Radioactivity | |
| 9752. |
How many mole of helium gas occupy \[22.4\ L\] at \[{{0}^{o}}C\] at 1 atm. pressure [Kurukshetra CEE 1992; CET 1992] |
| A. | 0.11 |
| B. | 0.90 |
| C. | 1.0 |
| D. | 1.11 |
| Answer» D. 1.11 | |
| 9753. |
Solubility product of a salt AB is \[1\times {{10}^{-8}}\] in a solution in which concentration of A is \[{{10}^{-3}}M\]. The salt will precipitate when the concentration of B becomes more than [MP PET 1990; KCET 2003] |
| A. | \[{{10}^{-4}}M\] |
| B. | \[{{10}^{-7}}M\] |
| C. | \[{{10}^{-6}}M\] |
| D. | \[{{10}^{-5}}M\] |
| Answer» E. | |
| 9754. |
Solubility product is [CET Pune 1998] |
| A. | The ionic product of an electrolyte in its saturated solution |
| B. | The product of the solubilities of the ions of the electrolyte |
| C. | The product of solubilities of the salts |
| D. | The product of the concentration of the ions |
| Answer» B. The product of the solubilities of the ions of the electrolyte | |
| 9755. |
Which of the following will have highest coagulating power for \[A{{s}_{2}}{{S}_{3}}\] colloid [CPMT 1988; DPMT 1984; Pb. PMT 2001; Pb. CET 2004] |
| A. | \[PO_{4}^{-3}\] |
| B. | \[SO_{4}^{-2}\] |
| C. | \[N{{a}^{+}}\] |
| D. | \[A{{l}^{3+}}\] |
| Answer» E. | |
| 9756. |
Which of the following pairs of elements might form an alloy [NCERT 1981] |
| A. | Zinc and lead |
| B. | Iron and mercury |
| C. | Iron and carbon |
| D. | Mercury and platinum |
| Answer» D. Mercury and platinum | |
| 9757. |
A biological catalyst is essentially [NCERT 1978; AFMC 1998] |
| A. | An amino acid |
| B. | A carbohydrate |
| C. | The nitrogen molecule |
| D. | An enzyme |
| Answer» E. | |
| 9758. |
The mass of a molecule of water is [Bihar CEE 1995] |
| A. | \[3\times {{10}^{-26}}\]kg |
| B. | \[3\times {{10}^{-25}}\]kg |
| C. | \[1.5\times {{10}^{-26}}\]kg |
| D. | \[2.5\times {{10}^{-26}}\]kg |
| Answer» B. \[3\times {{10}^{-25}}\]kg | |
| 9759. |
As compared to potassium, sodium has [MP PMT 1985] |
| A. | Lower electronegativity |
| B. | Higher ionization potential |
| C. | Greater atomic radius |
| D. | Lower melting point |
| Answer» C. Greater atomic radius | |
| 9760. |
Olefins can be hydrogenated by [AIIMS 1991] |
| A. | Zinc and \[HCl\] |
| B. | Nascent hydrogen |
| C. | Raney Ni and \[{{H}_{2}}\] |
| D. | Lithium hydride in ether |
| Answer» D. Lithium hydride in ether | |
| 9761. |
Structural formula for lewisite is |
| A. | \[\begin{align} & CHCl \\ & \text{ }\!\!|\!\!\text{ }\!\!|\!\!\text{ } \\ & CHAsC{{l}_{3}} \\ \end{align}\] |
| B. | \[\begin{align} & CHC{{l}_{2}} \\ & \text{ }\!\!|\!\!\text{ } \\ & CHAsC{{l}_{3}} \\ \end{align}\] |
| C. | \[\begin{align} & CHCl \\ & || \\ & CHAsC{{l}_{2}} \\ \end{align}\] |
| D. | None of these |
| Answer» D. None of these | |
| 9762. |
Water is a [KCET 2002] |
| A. | Amphoteric acid |
| B. | Aprotic solvent |
| C. | Protophobic solvent |
| D. | None of these |
| Answer» E. | |
| 9763. |
The chemical name of borax is [CPMT 1994] |
| A. | Sodium orthoborate |
| B. | Sodium metaborate |
| C. | Sodium tetraborate |
| D. | Sodium tetraborate decahydrate |
| Answer» E. | |
| 9764. |
For coagulating \[A{{s}_{2}}{{S}_{3}}\] colloidal sol, which of the following will have the lowest coagulation value [MP PMT 1996; DCE 2000] |
| A. | \[NaCl\] |
| B. | \[KCl\] |
| C. | \[BaC{{l}_{2}}\] |
| D. | \[AlC{{l}_{3}}\] |
| Answer» E. | |
| 9765. |
One mole of a solute \[A\] is dissolved in a given volume of a solvent. The association of the solute take place according to \[nA\]⇄\[{{(A)}_{n}}\]. The Van't Hoff factor \[i\]is expressed as [MP PMT 1997] |
| A. | \[i=1-x\] |
| B. | \[i=1+\frac{x}{n}\] |
| C. | \[i=\frac{1-x+\frac{x}{n}}{1}\] |
| D. | \[i=1\] |
| Answer» D. \[i=1\] | |
| 9766. |
Product obtained by nitration of propane is [RPMT 2003] |
| A. | Nitropropane |
| B. | Nitromethane |
| C. | Nitroethane |
| D. | All of these |
| Answer» E. | |
| 9767. |
Among the following statements on the nitration of aromatic compounds, the false one is [IIT-JEE 1997] |
| A. | The rate of nitration of benzene is almost the same as that of hexadeuterobenzene |
| B. | The rate of nitration of toluene is greater than that of benzene |
| C. | The rate of nitration of benzene is greater than that of hexadeuterobenzene |
| D. | Nitration is an electrophilic substitution reaction |
| Answer» D. Nitration is an electrophilic substitution reaction | |
| 9768. |
The correct order of acid strength is [CBSE PMT 2005] |
| A. | \[HClO<HCl{{O}_{2}}<HCl{{O}_{3}}<HCl{{O}_{4}}\] |
| B. | \[HCl{{O}_{4}}<HClO<HCl{{O}_{2}}<HCl{{O}_{3}}\] |
| C. | \[HCl{{O}_{2}}<HCl{{O}_{3}}<HCl{{O}_{4}}<HClO\] |
| D. | \[HCl{{O}_{4}}<HCl{{O}_{3}}<HCl{{O}_{2}}\]\[<HClO\] |
| Answer» B. \[HCl{{O}_{4}}<HClO<HCl{{O}_{2}}<HCl{{O}_{3}}\] | |
| 9769. |
The frequency of yellow light having wavelength 600 nm is [MP PET 2002] |
| A. | \[5.0\times {{10}^{14}}Hz\] |
| B. | \[2.5\times {{10}^{7}}Hz\] |
| C. | \[5.0\times {{10}^{7}}Hz\] |
| D. | \[2.5\times {{10}^{14}}Hz\] |
| Answer» B. \[2.5\times {{10}^{7}}Hz\] | |
| 9770. |
Internal energy is an example of [Pb. PMT 2000] |
| A. | Path function |
| B. | State function |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 9771. |
The following equilibrium exists in an aqueous solution of hydrogen sulphide : \[{{H}_{2}}S\] ⇄ \[{{H}^{+}}+H{{S}^{-}}\] If dilute \[HCl\] is added to an aqueous solution of \[{{H}_{2}}S\] without any change in temperature [NCERT 1989] |
| A. | The equilibrium constant will change |
| B. | The concentration of \[H{{S}^{-}}\]will increase |
| C. | The concentration of undissociated \[{{H}_{2}}S\] will decrease |
| D. | The concentration of \[H{{S}^{-}}\]will decrease |
| Answer» E. | |
| 9772. |
The reaction, which forms nitric oxide, is [KCET (Med.) 2001] |
| A. | C and \[{{N}_{2}}O\] |
| B. | \[Cu\] and \[{{N}_{2}}O\] |
| C. | \[Na\] and \[N{{H}_{3}}\] |
| D. | \[Cu\] and \[HN{{O}_{3}}\] |
| Answer» E. | |
| 9773. |
The ionic product of water at \[{{25}^{o}}C\] is \[{{10}^{-14}}.\] The ionic product at \[{{90}^{o}}C\] will be [CBSE PMT 1996] |
| A. | \[1\times {{10}^{-20}}\] |
| B. | \[1\times {{10}^{-12}}\] |
| C. | \[1\times {{10}^{-14}}\] |
| D. | \[1\times {{10}^{-16}}\] |
| Answer» C. \[1\times {{10}^{-14}}\] | |
| 9774. |
The compound formed by passing ethylene gas into cold alkaline solution of \[KMn{{O}_{4}}\] is [NCERT 1974, 81; CPMT 1979, 86, 88; MP PET 1985, 95; AFMC 1998] |
| A. | Ethyl alcohol |
| B. | Acetaldehyde |
| C. | Acetic acid |
| D. | Ethylene glycol |
| Answer» E. | |
| 9775. |
Blister copper is [CPMT 1976, 85, 2002; DPMT 1982; MP PET 1995; Bihar CEE 1995] |
| A. | Pure copper |
| B. | Ore of copper |
| C. | Alloy of copper |
| D. | 1% impure copper |
| Answer» E. | |
| 9776. |
Which of the following salt does not get hydrolysed in water [CPMT 2004] |
| A. | \[KCl{{O}_{4}}\] |
| B. | \[N{{H}_{4}}Cl\] |
| C. | \[C{{H}_{3}}COONa\] |
| D. | None of these |
| Answer» B. \[N{{H}_{4}}Cl\] | |
| 9777. |
Which of the following is a use of alum [CPMT 2004] |
| A. | Making explosives |
| B. | Bleaching clothes |
| C. | Water softening |
| D. | All of the above |
| Answer» D. All of the above | |
| 9778. |
In the formation of methane molecule, carbon makes use of [DPMT 2001; MP PMT 2002] |
| A. | \[sp\]-hybridised orbitals |
| B. | \[s{{p}^{2}}\]-hybridised orbitals |
| C. | \[s{{p}^{3}}\]-hybridised orbitals |
| D. | Unhybridised orbitals |
| Answer» D. Unhybridised orbitals | |
| 9779. |
The hybridisation of carbons of \[C-C\]single bond of \[HC\equiv C-CH=C{{H}_{2}}\]is [RPMT 2002] |
| A. | \[s{{p}^{3}}-s{{p}^{3}}\] |
| B. | \[sp-s{{p}^{2}}\] |
| C. | \[s{{p}^{3}}-sp\] |
| D. | \[s{{p}^{2}}-s{{p}^{3}}\] |
| Answer» C. \[s{{p}^{3}}-sp\] | |
| 9780. |
The specific heat of a metal is 0.16 its approximate atomic weight would be |
| A. | 32 |
| B. | 16 |
| C. | 40 |
| D. | 64 |
| Answer» D. 64 | |
| 9781. |
If molecular mass and atomic mass of sulphur are 256 and 32 respectively, its atomicity is [RPET 2000] |
| A. | 2 |
| B. | 8 |
| C. | 4 |
| D. | 16 |
| Answer» C. 4 | |
| 9782. |
Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final products obtained from it in the three conditions are, respectively [MP PMT 1997] |
| A. | \[Mn{{O}_{2}},Mn{{O}_{2}},M{{n}^{2+}}\] |
| B. | \[MnO_{4}^{2-},M{{n}^{3+}},M{{n}^{2+}}\] |
| C. | \[Mn{{O}_{2}},MnO_{4}^{2-},M{{n}^{3+}}\] |
| D. | \[MnO,Mn{{O}_{4}},M{{n}^{2+}}\] |
| Answer» B. \[MnO_{4}^{2-},M{{n}^{3+}},M{{n}^{2+}}\] | |
| 9783. |
According to Langmuir adsorption isotherm, the amount of gas adsorbed at very high pressures [MP PMT 1993] |
| A. | Reaches a constant limiting value |
| B. | Goes on increasing with pressure |
| C. | Goes on decreasing with pressure |
| D. | Increases first and decreases later with pressure |
| Answer» B. Goes on increasing with pressure | |
| 9784. |
Colloidal solution of gold cannot be prepared by |
| A. | Bredig's arc method |
| B. | Mechanical dispersion |
| C. | Reduction of gold chloride |
| D. | Exchange of solvents |
| Answer» E. | |
| 9785. |
Sky looks blue due to [MNR 1986; MP PET 1992] |
| A. | Dispersion effect |
| B. | Reflection |
| C. | Transmission |
| D. | Scattering |
| Answer» E. | |
| 9786. |
In Bredig's arc method some alkali is added because |
| A. | It increases electrical conductance |
| B. | To obtain molecular colloid |
| C. | To obtain colloidal particles of same size |
| D. | To stabilise the sol |
| Answer» E. | |
| 9787. |
Which of the following give \[{{H}_{2}}\]gas with Na [RPMT 2002] |
| A. | \[C{{H}_{4}}\] |
| B. | \[{{C}_{2}}{{H}_{6}}\] |
| C. | \[{{C}_{2}}{{H}_{4}}\] |
| D. | \[{{C}_{2}}{{H}_{2}}\] |
| Answer» E. | |
| 9788. |
Hydrophilic sols are |
| A. | Reversible |
| B. | Irreversible |
| C. | Unstable |
| D. | None of these |
| Answer» B. Irreversible | |
| 9789. |
Which ion has greatest radius in the following [CPMT 1976; NCERT 1977] |
| A. | \[{{H}^{-}}\] |
| B. | \[{{F}^{-}}\] |
| C. | \[B{{r}^{-}}\] |
| D. | \[{{I}^{-}}\] |
| Answer» E. | |
| 9790. |
Atomic radii of fluorine and neon in angstrom units are respectively given by [IIT 1987] |
| A. | 0.762, 1.60 |
| B. | 1.60, 1.60 |
| C. | 0.72, 0.72 |
| D. | None of these values |
| Answer» B. 1.60, 1.60 | |
| 9791. |
Formation of alkane by the action of Zn on alkyl halide is called [DPMT 1984; MHCET 2004] |
| A. | Frankland's reaction |
| B. | Wurtz reaction |
| C. | Cannizzaro reaction |
| D. | Kolbe's reaction |
| Answer» B. Wurtz reaction | |
| 9792. |
Which one of the following is considered as the main postulate of Bohr?s model of atom [AMU 2000] |
| A. | Protons are present in the nucleus |
| B. | Electrons are revolving around the nucleus |
| C. | Centrifugal force produced due to the revolving electrons balances the force of attraction between the electron and the protons |
| D. | Angular momentum of electron is an integral multiple of \[\frac{h}{2\pi }\] |
| Answer» E. | |
| 9793. |
Aluminium (III) chloride forms a dimer because [CBSE PMT 1995] |
| A. | Higher coordination number can be achieved by aluminium |
| B. | Aluminium has high ionization energy |
| C. | Aluminium belongs to III group |
| D. | It cannot form a trimer |
| Answer» B. Aluminium has high ionization energy | |
| 9794. |
Solubility of \[Ba{{F}_{2}}\] in a solution \[Ba{{(N{{O}_{3}})}_{2}}\] will be represents by the concentration term [UPSEAT 2001, 02; CPMT 2002] |
| A. | \[[B{{a}^{++}}]\] |
| B. | \[[{{F}^{-}}]\] |
| C. | \[\frac{1}{2}[{{F}^{-}}]\] |
| D. | \[2\,[NO_{3}^{-}]\] |
| Answer» D. \[2\,[NO_{3}^{-}]\] | |
| 9795. |
Which of the following is formed when calcium combines with oxygen [MH CET 2000] |
| A. | Ca |
| B. | CaO |
| C. | \[Ca{{O}_{2}}\] |
| D. | \[C{{a}_{2}}{{O}_{2}}\] |
| Answer» C. \[Ca{{O}_{2}}\] | |
| 9796. |
The number of water molecules in gypsum and plaster of paris respectively are [Pb. PMT 1999] |
| A. | 1/2 and 2 |
| B. | 2 and ½ |
| C. | 2 and 1 |
| D. | 5 and 2 |
| Answer» C. 2 and 1 | |
| 9797. |
Wilkinson's catalyst is used in |
| A. | Polymerization |
| B. | Condensation |
| C. | Halogenation |
| D. | Hydrogenation |
| Answer» E. | |
| 9798. |
Sugar of lead is |
| A. | \[2PbS{{O}_{4}}.PbO\] |
| B. | \[{{(C{{H}_{3}}COO)}_{2}}Pb\] |
| C. | \[PbC{{O}_{3}}\] |
| D. | \[PbC{{O}_{3}}.Pb{{(OH)}_{2}}\] |
| Answer» C. \[PbC{{O}_{3}}\] | |
| 9799. |
When an electron drops from a higher energy level to a low energy level, then [AMU 1985] |
| A. | Energy is emitted |
| B. | Energy is absorbed |
| C. | Atomic number increases |
| D. | Atomic number decreases |
| Answer» B. Energy is absorbed | |
| 9800. |
The change in optical rotation, with time, of freshly prepared solution of sugar is known as [CPMT 1982, 85; BHU 1997] |
| A. | Rotatory motion |
| B. | Inversion |
| C. | Specific rotation |
| D. | Mutarotation |
| Answer» E. | |