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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.
| 7901. |
Permanent magnet is made from [MP PET/PMT 1988; CBSE 1989] |
| A. | Cast iron |
| B. | Steel |
| C. | Wrought Iron |
| D. | All of these |
| Answer» C. Wrought Iron | |
| 7902. |
When one mole of monoatomic ideal gas at T K undergoes adiabatic change under a constant external pressure of 1 atm changes volume from 1 litre to 2 litre. The final temperature in Kelvin would be [IIT 2005] |
| A. | \[\frac{T}{{{2}^{(2/3)}}}\] |
| B. | T + \[\frac{2}{3\times 0.0821}\] |
| C. | T |
| D. | T - \[\frac{2}{3\times 0.0821}\] |
| Answer» E. | |
| 7903. |
Which of the following is not oxidized by \[{{O}_{3}}\] [IIT Screening 2005] |
| A. | KI |
| B. | \[FeS{{O}_{4}}\] |
| C. | \[KMn{{O}_{4}}\] |
| D. | \[{{K}_{2}}Mn{{O}_{4}}\] |
| Answer» D. \[{{K}_{2}}Mn{{O}_{4}}\] | |
| 7904. |
The number and type of bonds between 2 carbon atoms in \[{{N}_{2}}\] [UPSEAT 2001] |
| A. | One sigma \[(\sigma )\] and one pi\[(\pi )\] bond |
| B. | One sigma \[{{O}_{2}}\] and two pi \[(\pi )\] bond |
| C. | One sigma \[(\sigma )\] and half pi \[(\pi )\] bond |
| D. | One sigma \[C{{O}_{2}}\] bond |
| Answer» C. One sigma \[(\sigma )\] and half pi \[(\pi )\] bond | |
| 7905. |
The emission spectrum of hydrogen is found to satisfy the expression for the energy change. \[\Delta E\] (in joules) such that \[\Delta E=2.18\times 10\left( \frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}} \right)\,\,J\] where \[{{n}_{1}}\] = 1, 2, 3?.. and \[{{n}_{2}}\] = 2, 3, 4??. The spectral lines correspond to Paschen series to [UPSEAT 2002] |
| A. | \[{{n}_{1}}=1\] and \[{{n}_{2}}=2,\,\,3,\,\,4\] |
| B. | \[{{n}_{1}}=3\] and \[{{n}_{2}}=4,\,\,5,\,\,6\] |
| C. | \[{{n}_{1}}=1\] and \[{{n}_{2}}=3,\,\,4,\,\,5\] |
| D. | \[{{n}_{1}}=2\] and \[{{n}_{2}}=3,\,\,3,\,\,5\] |
| E. | \[{{n}_{1}}=1\] and \[{{n}_{2}}=\text{infinity}\] |
| Answer» C. \[{{n}_{1}}=1\] and \[{{n}_{2}}=3,\,\,4,\,\,5\] | |
| 7906. |
Glass is a [AIEEE 2003; RPET 2003] |
| A. | Micro-crystaline solid |
| B. | Super cooled liquid |
| C. | Gel |
| D. | Polymeric mixture |
| Answer» C. Gel | |
| 7907. |
Which of the following represents surfactant molecule [JIPMER 1997] |
| A. | \[{{C}_{17}}{{H}_{36}}\] |
| B. | \[{{C}_{17}}{{H}_{25}}CO{{O}^{-}}N{{a}^{+}}\] |
| C. | \[{{H}_{2}}O\] |
| D. | None of these |
| Answer» C. \[{{H}_{2}}O\] | |
| 7908. |
The entropy of a perfectly crystalline solid at absolute zero is [AMU 2000] |
| A. | Positive |
| B. | Negative |
| C. | Zero |
| D. | Not definite |
| Answer» D. Not definite | |
| 7909. |
Physical adsorption is essentially quite appreciable |
| A. | At room temperature |
| B. | At higher temperature |
| C. | At lower temperature |
| D. | None of these |
| Answer» D. None of these | |
| 7910. |
In physical adsorption, the gas molecules are held on solid surface by [MP PET 1996; AIIMS 1998] |
| A. | Chemical forces |
| B. | Electrostatic forces |
| C. | Gravitational forces |
| D. | Vander Waal's forces |
| Answer» E. | |
| 7911. |
The compound HCl behaves as ?. in the reaction, \[HCl+HF\to H_{2}^{+}Cl+{{F}^{-}}\] [JIPMER 2001] |
| A. | Weak base |
| B. | Weak acid |
| C. | Strong base |
| D. | Strong acid |
| Answer» B. Weak acid | |
| 7912. |
The basis on the mode of their formation, the polymers can be classified [MP PET 1999] |
| A. | As addition polymers only |
| B. | As condensation polymers only |
| C. | As copolymers |
| D. | Both as addition and condensation polymers |
| Answer» E. | |
| 7913. |
Addition of bromine to 1, 3-butadiene gives [CPMT 1987, 93] |
| A. | 1, 2 addition product only |
| B. | 1, 4 addition product only |
| C. | Both 1, 2 and 1, 4 addition products |
| D. | No reaction |
| Answer» D. No reaction | |
| 7914. |
The molecular formula of felspar is [MP PMT 2003] |
| A. | \[{{K}_{2}}O\,.\,A{{l}_{2}}{{O}_{3}}.\,6Si{{O}_{2}}\] |
| B. | \[{{K}_{2}}O\,.\,3A{{l}_{2}}{{O}_{3}}.\,6Si{{O}_{2}}\] |
| C. | \[N{{a}_{3}}Al{{F}_{6}}\] |
| D. | \[CaS{{O}_{4}}.\,2{{H}_{2}}O\] |
| Answer» B. \[{{K}_{2}}O\,.\,3A{{l}_{2}}{{O}_{3}}.\,6Si{{O}_{2}}\] | |
| 7915. |
The aqueous solution of \[FeC{{l}_{3}}\] is acidic due to [CPMT 1972, 79, 83, 84; MP PET/PMT 1988; RPMT 2000] |
| A. | Acidic impurities |
| B. | Ionisation |
| C. | Hydrolysis |
| D. | Dissociation |
| Answer» D. Dissociation | |
| 7916. |
When a lead storage battery is discharged [IIT 1987; MP PMT 2004] |
| A. | \[F{{e}^{2+}}\]is evolved |
| B. | Lead sulphate is consumed |
| C. | Lead is formed |
| D. | Sulphuric acid is consumed |
| Answer» E. | |
| 7917. |
Alum purifies muddy water by |
| A. | Dialysis |
| B. | Absorption |
| C. | Coagulation |
| D. | Forming a true solution |
| Answer» D. Forming a true solution | |
| 7918. |
The conjugate base of \[N{{H}_{2}}^{-}\]is [EAMCET 1998] |
| A. | \[N{{H}_{3}}\] |
| B. | \[N{{H}^{2-}}\] |
| C. | \[NH_{4}^{+}\] |
| D. | \[{{N}_{3}}^{-}\] |
| Answer» C. \[NH_{4}^{+}\] | |
| 7919. |
Adsorption is always [DPMT 2000] |
| A. | Endothermic |
| B. | Exothermic |
| C. | Either A or B |
| D. | None of these |
| Answer» C. Either A or B | |
| 7920. |
From argentite \[(A{{g}_{2}}S)\] ore the method used in obtaining metallic silver is [MP PMT 1989] |
| A. | Fused mixture of \[A{{g}_{2}}S\] and \[KCl\] is electrolysed |
| B. | \[A{{g}_{2}}S\] is reduced with \[CO\] |
| C. | \[A{{g}_{2}}S\]is roasted to \[A{{g}_{2}}O\]which is reduced with carbon |
| D. | Treating argentite with \[NaCN\] solution followed by metal displacement with zinc |
| Answer» E. | |
| 7921. |
Which one of the following has \[\Delta {{S}^{o}}\] greater than zero [AIIMS 2003] |
| A. | \[CaO+C{{O}_{2}}(g)\]⇌ \[CaC{{O}_{3}}(s)\] |
| B. | \[NaCl\,(aq)\] ⇌ \[NaCl(s)\] |
| C. | \[NaN{{O}_{3}}(s)\] ⇌ \[N{{a}^{+}}(aq)+NO_{3}^{-}(aq)\] |
| D. | \[{{N}_{2}}(g)+3{{H}_{2}}(g)\] ⇌ \[2N{{H}_{3}}(g)\] |
| Answer» D. \[{{N}_{2}}(g)+3{{H}_{2}}(g)\] ⇌ \[2N{{H}_{3}}(g)\] | |
| 7922. |
A reaction having equal activation energies for forward and reverse reaction has [MP PMT 2002] |
| A. | \[\Delta H=0\] |
| B. | \[\Delta S=0\] |
| C. | Zero order |
| D. | None of these |
| Answer» B. \[\Delta S=0\] | |
| 7923. |
Which of the following solutions in water will have the lowest vapour pressure [Roorkee 2000] |
| A. | 0.1 M, NaCl |
| B. | 0.1 M, Sucrose |
| C. | 0.1 M, \[BaC{{l}_{2}}\] |
| D. | 0.1 M \[N{{a}_{3}}P{{O}_{4}}\] |
| Answer» E. | |
| 7924. |
Benzene can be obtained in the reaction [RPET 2000; Bihar MEE 1997] |
| A. | Ethene + 1, 3-butadiene |
| B. | Trimerisation of ethyne |
| C. | Reduction of PhCHO |
| D. | All of these |
| Answer» C. Reduction of PhCHO | |
| 7925. |
The oxide of a metal has 32% oxygen. Its equivalent weight would be [MP PMT 1985] |
| A. | 34 |
| B. | 32 |
| C. | 17 |
| D. | 8 |
| Answer» D. 8 | |
| 7926. |
The process in which higher hydrocarbons are broken down into lower hydrocarbons by controlled pyrolysis, is called [MP PMT 2002] |
| A. | Hydrolysis |
| B. | Cracking |
| C. | Oxidation |
| D. | Reduction |
| Answer» C. Oxidation | |
| 7927. |
Finely divided iron combines with \[CO\] to give [MNR 1994] |
| A. | \[Fe{{(CO)}_{5}}\] |
| B. | \[F{{e}_{2}}{{(CO)}_{9}}\] |
| C. | \[F{{e}_{3}}{{(CO)}_{12}}\] |
| D. | \[Fe{{(CO)}_{6}}\] |
| Answer» B. \[F{{e}_{2}}{{(CO)}_{9}}\] | |
| 7928. |
In Goldschmidt aluminothermic process, thermite contains [KCET 2003] |
| A. | 3 parts of \[A{{l}_{2}}{{O}_{3}}\] and 4 parts of Al |
| B. | 3 parts of \[F{{e}_{2}}{{O}_{3}}\]and 2 parts of Al |
| C. | 3 parts of \[F{{e}_{2}}{{O}_{3}}\]and 1 part of Al |
| D. | 1 part of \[F{{e}_{2}}{{O}_{3}}\] and 1 part of Al |
| Answer» D. 1 part of \[F{{e}_{2}}{{O}_{3}}\] and 1 part of Al | |
| 7929. |
According to Lewis concept, an acid is a substance which [EAMCET 1981; NCERT 1981; CPMT 1986; MP PMT 1987] |
| A. | Accepts protons |
| B. | Donates protons |
| C. | Accepts a lone pair of electrons |
| D. | Donates a lone pair of electrons |
| Answer» D. Donates a lone pair of electrons | |
| 7930. |
In the reaction \[N{{H}_{3}}+B{{F}_{3}}\] ⇌ \[N{{H}_{3}}\to B{{F}_{3}},\,\,B{{F}_{3}}\] is [MP PMT 1989; MHCET 2001] |
| A. | Lewis acid |
| B. | Lewis base |
| C. | Neither Lewis acid nor Lewis base |
| D. | Lewis acid and Lewis base both |
| Answer» B. Lewis base | |
| 7931. |
\[{{K}_{sp}}\] value of \[Al\,{{(OH)}_{3}}\] and \[Zn\,{{(OH)}_{2}}\] are \[8.5\times {{10}^{-23}}\]and \[1.8\times {{10}^{-14}}\] respectively. If \[N{{H}_{4}}OH\] is added in a solution of \[A{{l}^{3+}}\]and \[Z{{n}^{2+}},\] which will precipitate earlier [MP PMT 1989; CPMT 1989] |
| A. | \[Al\,{{(OH)}_{3}}\] |
| B. | \[Zn\,{{(OH)}_{2}}\] |
| C. | Both together |
| D. | None |
| Answer» B. \[Zn\,{{(OH)}_{2}}\] | |
| 7932. |
Which of the following is also known as 'Fools gold' [DCE 2003] |
| A. | Wurtzite |
| B. | Iron pyrites |
| C. | Chalcosite |
| D. | Silver glance |
| Answer» C. Chalcosite | |
| 7933. |
The enzyme ptylin used for the digestion of food is present in [CPMT 1981] |
| A. | Saliva |
| B. | Blood |
| C. | Intestine |
| D. | Adrenal glands |
| Answer» B. Blood | |
| 7934. |
An aqueous solution of aluminium sulphate shows [DPMT 2001] |
| A. | A basic nature |
| B. | An acidic nature |
| C. | A neutral nature |
| D. | Both acidic and basic nature |
| Answer» C. A neutral nature | |
| 7935. |
When treated with ammoniacal cuprous chloride, which one among the following forms copper derivative [CBSE PMT 1989; MP PMT 1993] |
| A. | \[{{C}_{2}}{{H}_{6}}\] |
| B. | \[{{C}_{2}}{{H}_{4}}\] |
| C. | \[{{C}_{2}}{{H}_{2}}\] |
| D. | \[{{C}_{6}}{{H}_{6}}\] |
| Answer» D. \[{{C}_{6}}{{H}_{6}}\] | |
| 7936. |
Railway wagon axles are made by heating rods of iron embedded in charcoal powder. The process is known as [CPMT 1972; DCE 2000; KCET 2003; UPSEAT 2001] |
| A. | Case hardening |
| B. | Sherardizing |
| C. | Annealing |
| D. | Tempering |
| Answer» B. Sherardizing | |
| 7937. |
The ratio of amounts of \[{{H}_{2}}S\]needed to precipitate all the metal ions from 100 ml of 1 M \[AgN{{O}_{3}}\]and 100 ml of 1 M \[CuS{{O}_{4}}\]will be |
| A. | 1:1 |
| B. | 1:2 |
| C. | 2:1 |
| D. | None of these |
| Answer» C. 2:1 | |
| 7938. |
When radium atom which is placed in II group, loses an \[\alpha \]- particle, a new element is formed which should be placed in group [CPMT 1979, 80, 94; NCERT 1979, 82] |
| A. | Second |
| B. | First |
| C. | Fourth |
| D. | Zero |
| Answer» E. | |
| 7939. |
The solubility product of \[1\times {{10}^{-5}}\] is \[1.44\times {{10}^{-4}}\] at\[{{100}^{o}}C\]. The solubility of silver chloride in boiling water may be [MP PMT 1994; Bihar MEE 1998] |
| A. | \[0.72\times {{10}^{-4}}\,M\] |
| B. | \[1.20\times {{10}^{-2}}\,M\] |
| C. | \[{{80}^{o}}C,\] |
| D. | \[0.5\,M\,HCOOH,\] |
| Answer» C. \[{{80}^{o}}C,\] | |
| 7940. |
Which is a colloid [CPMT 1984] |
| A. | Sugar solution |
| B. | Urea solution |
| C. | Silicic acid |
| D. | \[NaCl\] solution |
| Answer» D. \[NaCl\] solution | |
| 7941. |
An alkene, on ozonolysis gives formaldehyde and acetaldehyde. The alkene is : [BVP 2004] |
| A. | Ethene |
| B. | Propene |
| C. | Butene-1 |
| D. | Butene-2 |
| Answer» C. Butene-1 | |
| 7942. |
If enthalpies of methane and ethane are respectively 320 and 360 calories then the bond energy of \[C-C\] bond is [UPSEAT 2003] |
| A. | 80 calories |
| B. | 40 calories |
| C. | 60 calories |
| D. | 120 calories |
| Answer» C. 60 calories | |
| 7943. |
Catalytic hydrogenation of benzene gives [AIIMS 1996] |
| A. | Xylene |
| B. | Cyclohexane |
| C. | Benzoic acid |
| D. | Toluene |
| Answer» C. Benzoic acid | |
| 7944. |
Which can be reduced to the metal by heating it in a stream of hydrogen [DPMT 2000] |
| A. | Copper (II) oxide |
| B. | Magnesium oxide |
| C. | Aluminium oxide |
| D. | Calcium oxide |
| Answer» B. Magnesium oxide | |
| 7945. |
Smoke is an example of [CPMT 1984; BIT 1992] |
| A. | Gas dispersed in liquid |
| B. | Gas dispersed in solid |
| C. | Solid dispersed in gas |
| D. | Solid dispersed in solid |
| Answer» D. Solid dispersed in solid | |
| 7946. |
The postulate of Bohr theory that electrons jump from one orbit to the other, rather than flow is according to |
| A. | The quantisation concept |
| B. | The wave nature of electron |
| C. | The probability expression for electron |
| D. | Heisenberg uncertainty principle |
| Answer» B. The wave nature of electron | |
| 7947. |
The final product formed by the ozonolysis of compound \[RCH=C{{R}_{2}}\] is [NCERT 1978] |
| A. | RCHO |
| B. | \[{{R}_{2}}CO\] |
| C. | Both A and B |
| D. | None of these |
| Answer» D. None of these | |
| 7948. |
Carbon atoms in benzene molecule is inclined at an angle of [BHU 1985] |
| A. | \[{{120}^{o}}\] |
| B. | \[{{180}^{o}}\] |
| C. | \[{{109}^{o}}2{8}?\] |
| D. | \[{{60}^{o}}\] |
| Answer» B. \[{{180}^{o}}\] | |
| 7949. |
With reference to protonic acids, which of the following statements is correct [CPMT 1990] |
| A. | \[P{{H}_{3}}\]is more basic than \[N{{H}_{3}}\] |
| B. | \[P{{H}_{3}}\]is less basic than \[N{{H}_{3}}\] |
| C. | \[P{{H}_{3}}\]is equally basic as \[N{{H}_{3}}\] |
| D. | \[P{{H}_{3}}\]is amphoteric while \[N{{H}_{3}}\] is basic |
| Answer» C. \[P{{H}_{3}}\]is equally basic as \[N{{H}_{3}}\] | |
| 7950. |
In the reaction \[2N{{a}_{2}}{{S}_{2}}{{O}_{3}}+{{I}_{2}}\to N{{a}_{2}}{{S}_{4}}{{O}_{6}}+2NaI\], the equivalent weight of \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\](mol. wt. = M) is equal to |
| A. | M |
| B. | \[M/2\] |
| C. | \[M/3\] |
| D. | \[M/4\] |
| Answer» B. \[M/2\] | |