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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.
| 8201. |
The reason for exhibiting Tyndall effect by the colloidal particle is [CPMT 1980, 86; MP PMT 1989] |
| A. | Reflection of light |
| B. | Refraction of light |
| C. | Polarisation of light |
| D. | Scattering of light |
| Answer» E. | |
| 8202. |
Invertase brings about the conversion of [KCET 1986] |
| A. | Starch to glucose |
| B. | Sucrose to glucose and fructose |
| C. | Maltose to glucose |
| D. | Glucose to \[{{C}_{2}}{{H}_{5}}OH\] and \[C{{O}_{2}}\] |
| Answer» C. Maltose to glucose | |
| 8203. |
Correct statement about1, 3-dibutene [UPSEAT 2003] |
| A. | Conjugated double bonds are present |
| B. | Reacts with HBr |
| C. | Forms polymer |
| D. | All of these |
| Answer» E. | |
| 8204. |
Number of electrons in the outermost orbit of the element of atomic number 15 is [CPMT 1988, 93] |
| A. | 1 |
| B. | 3 |
| C. | 5 |
| D. | 7 |
| Answer» D. 7 | |
| 8205. |
Which of the following reacts with sodium with the elimination of hydrogen [BHU 1983] |
| A. | \[C{{H}_{4}}\] |
| B. | \[{{C}_{2}}{{H}_{6}}\] |
| C. | \[{{C}_{2}}{{H}_{4}}\] |
| D. | \[{{C}_{2}}{{H}_{2}}\] |
| Answer» E. | |
| 8206. |
Acetylene is obtained by the electrolysis of [BHU 1986] |
| A. | Sodium succinate |
| B. | Potassium fumarate |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 8207. |
Which of the following will have the lowest vapour pressure |
| A. | \[0.1M\,KCl\] solution |
| B. | \[0.1M\] urea solution |
| C. | \[0.1M\,N{{a}_{2}}S{{O}_{4}}\] solution |
| D. | \[0.1M\,{{K}_{4}}Fe{{(CN)}_{6}}\] solution |
| Answer» E. | |
| 8208. |
Which one of the following is not correct [MP PMT 1997] |
| A. | \[_{3}L{{i}^{7}}+{{\,}_{1}}{{H}^{1}}\to {{\,}_{4}}B{{e}^{7}}+{{\,}_{0}}{{n}^{1}}\] |
| B. | \[_{21}S{{c}^{45}}+{{\,}_{0}}{{n}^{1}}\to {{\,}_{20}}C{{a}^{45}}+{{\,}_{0}}{{n}^{1}}\] |
| C. | \[_{33}A{{s}^{75}}+{{\,}_{2}}H{{e}^{4}}\to {{\,}_{35}}B{{r}^{78}}+{{\,}_{0}}{{n}^{1}}\] |
| D. | \[_{83}B{{i}^{209}}+{{\,}_{1}}{{H}^{2}}\to {{\,}_{84}}P{{o}^{210}}+{{\,}_{0}}{{n}^{1}}\] |
| Answer» C. \[_{33}A{{s}^{75}}+{{\,}_{2}}H{{e}^{4}}\to {{\,}_{35}}B{{r}^{78}}+{{\,}_{0}}{{n}^{1}}\] | |
| 8209. |
The amount of water that should be added to 500 ml of 0.5 N solution of \[NaOH\]to give a concentration of 10 mg per ml is |
| A. | 100 |
| B. | 200 |
| C. | 250 |
| D. | 500 |
| Answer» E. | |
| 8210. |
Which of the following relations for expressing volume of a sample is not correct |
| A. | \[1L={{10}^{3}}\,ml\] |
| B. | \[1\,d{{m}^{3}}=1\,L\] |
| C. | \[1\,L={{10}^{3}}{{m}^{3}}\] |
| D. | \[1L={{10}^{3}}\,c{{m}^{3}}\] |
| Answer» D. \[1L={{10}^{3}}\,c{{m}^{3}}\] | |
| 8211. |
The \[H-C-H\] bond angle in \[C{{H}_{4}}\]is [MP PET 2002] |
| A. | \[{{109}^{o}}28'\] |
| B. | \[{{107}^{o}}28'\] |
| C. | \[{{90}^{o}}\] |
| D. | \[{{180}^{o}}\] |
| Answer» B. \[{{107}^{o}}28'\] | |
| 8212. |
Which of the following types of metals form the most efficient catalysts [KCET 2005] |
| A. | Alkali metals |
| B. | Alkaline earth metals |
| C. | Transition metals |
| D. | All of these |
| Answer» D. All of these | |
| 8213. |
The compound B formed in the following sequences of reactions is \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH\xrightarrow{PC{{l}_{3}}}A\xrightarrow{Alco.\text{ }KOH}B\] [NCERT 1981] |
| A. | Propyne |
| B. | Propene |
| C. | Propanol |
| D. | Propane |
| Answer» C. Propanol | |
| 8214. |
Three dimensional molecules with cross links are formed in the case of a [KCET 2005] |
| A. | Thermoplastic |
| B. | Thermosetting plastic |
| C. | Both |
| D. | None |
| Answer» C. Both | |
| 8215. |
The dehydrohalogenation of neopentyl bromide with alcoholic KOH mainly gives [IIT-JEE (Screening) 1990; MP PET 1993] |
| A. | 2-methyl-1-butene |
| B. | 2-methyl-2-butene |
| C. | 2, 2-dimethyl-1-butene |
| D. | 2-butene |
| Answer» C. 2, 2-dimethyl-1-butene | |
| 8216. |
Which of the following element constitutes a major impurity in pig iron [CBSE PMT 1998] |
| A. | Silicon |
| B. | Oxygen |
| C. | Sulphur |
| D. | Graphite |
| Answer» E. | |
| 8217. |
\[1.5\] mol of \[{{O}_{2}}\] combine with \[Mg\] to form oxide \[MgO\]. The mass of \[Mg\] (at. mass 24) that has combined is [KCET 2001] |
| A. | \[72\ g\] |
| B. | \[36\ g\] |
| C. | \[48\ g\] |
| D. | \[24\ g\] |
| Answer» B. \[36\ g\] | |
| 8218. |
The number of \[\alpha \] and \[\beta \]- particles emitted in the nuclear reaction \[_{90}T{{h}^{228}}{{\to }_{83}}B{{i}^{212}}\] are respectively [MNR 1992; MP PMT 1993; AFMC 1998, 2001; MH CET 1999; UPSEAT 2000, 01; AMU 2001; CPMT 2002] |
| A. | 4, 1 |
| B. | 3, 7 |
| C. | 8, 1 |
| D. | 4, 7 |
| Answer» B. 3, 7 | |
| 8219. |
The function of anhydrous \[AlC{{l}_{3}}\] in the Friedel-Craft?s reaction is to [MNR 1986, 1995; Roorkee 1999; BHU 2001; CPMT 2002; MPPET 2001] |
| A. | Absorb water |
| B. | Absorb HCl |
| C. | To produce electrophile |
| D. | To produce nucleophile |
| Answer» D. To produce nucleophile | |
| 8220. |
Which of the following would be least reactive towards bromine [NCERT 1981] |
| A. | Nitrobenzene |
| B. | Phenol |
| C. | Anisole |
| D. | Chlorobenzene |
| Answer» B. Phenol | |
| 8221. |
If equivalent conductance of \[1M\] benzoic acid is \[12.8oh{{m}^{-1}}c{{m}^{2}}\] and if the conductance of benzoate ion and \[{{H}^{+}}\] ion are 42 and \[288.42\,oh{{m}^{-1}}c{{m}^{2}}\] respectively. its degree of dissociation is [DPMT 2005] |
| A. | 39% |
| B. | 3.9% |
| C. | 0.35% |
| D. | 0.039% |
| Answer» C. 0.35% | |
| 8222. |
By annealing, steel [BHU 2004] |
| A. | Becomes soft |
| B. | Becomes liquid |
| C. | Becomes hard and brittle |
| D. | Is covered with a thin film of \[F{{e}_{3}}{{O}_{4}}\] |
| Answer» B. Becomes liquid | |
| 8223. |
A precipitate of calcium oxalate will not dissolve in [CPMT 1971, 89; IIT 1986] |
| A. | \[HCl\] |
| B. | \[HN{{O}_{3}}\] |
| C. | Aquaregia |
| D. | \[C{{H}_{3}}COOH\] |
| Answer» E. | |
| 8224. |
Which of the following has the largest molecular mass |
| A. | Monomer |
| B. | Dimer |
| C. | Polymer |
| D. | Oligomer |
| Answer» D. Oligomer | |
| 8225. |
Ethene gives with acidic \[KMn{{O}_{4}}\] solution [MP PMT 1997] |
| A. | Ethylene glycol |
| B. | Ethylene oxide |
| C. | Formaldehyde |
| D. | Acetaldehyde |
| Answer» D. Acetaldehyde | |
| 8226. |
The emulsifying agent in milk is |
| A. | Lactic acid |
| B. | Casein |
| C. | Lactose |
| D. | Fat |
| Answer» C. Lactose | |
| 8227. |
Anhydrous sodium acetate on heating with sodalime gives [CPMT 1972, 84; Pb. CET 2001, 2003] |
| A. | Acetic acid |
| B. | Methane |
| C. | Calcium acetate |
| D. | Ethane |
| Answer» C. Calcium acetate | |
| 8228. |
The hydride ions \[({{H}^{-}})\] are isoelectronic with [AFMC 1995; Bihar MEE 1997] |
| A. | \[Li\] |
| B. | \[H{{e}^{+}}\] |
| C. | \[He\] |
| D. | \[Be\] |
| Answer» D. \[Be\] | |
| 8229. |
\[1.0\,gm\] radioactive sodium on decay becomes \[0.25\,gm\] in 16 hours. How much time \[48\,gm\] of same radioactive sodium will need to become \[3.0\,gm\] |
| A. | 48 hours |
| B. | 32 hours |
| C. | 20 hours |
| D. | 16 hours |
| Answer» C. 20 hours | |
| 8230. |
According to Lewis the ligands are [MP PMT 2002] |
| A. | Acidic in nature |
| B. | Basic in nature |
| C. | Neither acidic nor basic |
| D. | Some are acidic and others are basic |
| Answer» C. Neither acidic nor basic | |
| 8231. |
The reaction \[C{{H}_{2}}=C{{H}_{2}}+{{H}_{2}}\underset{250-{{300}^{o}}C}{\mathop{\xrightarrow{Ni}}}\,C{{H}_{3}}-C{{H}_{3}}\] is called [MP PMT 1996; CBSE PMT 2001; MH CET 2001;BHU 2002] |
| A. | Wurtz's reaction |
| B. | Kolbe's reaction |
| C. | Sabatier and Senderen's reaction |
| D. | Carbylamine reaction |
| Answer» D. Carbylamine reaction | |
| 8232. |
In smelting of iron, which of the following reactions takes place in Blast furnace at \[{{400}^{o}}C-{{600}^{o}}C\] [MP PET 2002] |
| A. | \[CaO+Si{{O}_{2}}\to CaSi{{O}_{3}}\] |
| B. | \[2FeS+3{{O}_{2}}\to 2Fe+S{{O}_{2}}\] |
| C. | \[FeO+Si{{O}_{2}}\to FeSi{{O}_{3}}\] |
| D. | \[F{{e}_{2}}{{O}_{3}}+3CO\to 2Fe+3C{{O}_{2}}\] |
| Answer» E. | |
| 8233. |
Solubility product of a sulphide MS is \[3\times {{10}^{-25}}\]and that of another sulphide NS is \[4\times {{10}^{-40}}\]. In ammoniacal solution [NCERT 1981] |
| A. | Only NS gets precipitated |
| B. | Only MS gets precipitated |
| C. | No sulphide precipitates |
| D. | Both sulphides precipitate |
| Answer» E. | |
| 8234. |
Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because [KCET 1993] |
| A. | Aluminium is a noble metal |
| B. | Oxygen forms a protective oxide layer |
| C. | Iron undergoes reaction easily with water |
| D. | Iron forms mono and divalent ions |
| Answer» C. Iron undergoes reaction easily with water | |
| 8235. |
Which of the following represents the given mode of hybridisation sp2_ sp2_ sp-sp from left to right [IIT-JEE (Screening) 2003] |
| A. | \[{{H}_{2}}C=CH-C\equiv CH\] |
| B. | \[HC\equiv C-C\equiv CH\] |
| C. | \[{{H}_{2}}C=C=C=C{{H}_{2}}\] |
| D. | |
| Answer» B. \[HC\equiv C-C\equiv CH\] | |
| 8236. |
During a \[\beta \]-decay the mass of the atomic nucleus [MP PET 1996] |
| A. | Decreases by one unit |
| B. | Increases by one unit |
| C. | Decreases by two units |
| D. | Remains unaffected |
| Answer» E. | |
| 8237. |
The suitable indicator for strong acid and weak base is [RPMT 1997; UPSEAT 2002] |
| A. | Methyl orange |
| B. | Methyl red |
| C. | Phenol red |
| D. | Phenolphthalein |
| Answer» B. Methyl red | |
| 8238. |
The structure of the product(Z) in the reactions given below \[HC\equiv CH\underset{{{H}^{+}}}{\mathop{\xrightarrow{NaN{{H}_{2}},C{{H}_{3}}COC{{H}_{3}}}}}\,X\underset{{{H}_{2}}O}{\mathop{\xrightarrow{H{{g}^{2+}},{{H}_{3}}{{O}^{+}}}}}\,Z\] is [Roorkee 2000] |
| A. | \[\begin{array}{*{35}{l}} C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{2}}OH \\ \end{array}\] |
| B. | \[C{{H}_{3}}-\underset{O}{\mathop{\underset{||}{\mathop{C}}\,}}\,-\overset{C{{H}_{3}}}{\mathop{\overset{\,\,\,|\,\,\,\,\,\,\,\,\,}{\mathop{CH}}\,}}\,-C{{H}_{2}}OH\] |
| C. | \[C{{H}_{3}}-\underset{O}{\mathop{\underset{||}{\mathop{C}}\,}}\,-\overset{C{{H}_{3}}}{\mathop{\overset{|\,\,\,\,\,\,\,\,}{\mathop{\underset{OH}{\mathop{\underset{|\,\,\,\,\,\,\,}{\mathop{C\,-\,}}\,}}\,}}\,}}\,C{{H}_{3}}\] |
| D. | \[C{{H}_{3}}-CHOH-\overset{C{{H}_{3}}}{\mathop{\overset{|\,\,\,\,}{\mathop{CH}}\,-}}\,CHO\] |
| Answer» D. \[C{{H}_{3}}-CHOH-\overset{C{{H}_{3}}}{\mathop{\overset{|\,\,\,\,}{\mathop{CH}}\,-}}\,CHO\] | |
| 8239. |
The commonest disaccharide has the molecular formula [CPMT 1982; Manipal MEE 1995; MP PET 1999; AIIMS 1999] |
| A. | \[{{C}_{10}}{{H}_{18}}{{O}_{9}}\] |
| B. | \[{{C}_{10}}{{H}_{20}}{{O}_{10}}\] |
| C. | \[{{C}_{18}}{{H}_{22}}{{O}_{11}}\] |
| D. | \[{{C}_{12}}{{H}_{22}}{{O}_{11}}\] |
| Answer» E. | |
| 8240. |
When sodium propionate is heated with soda lime, the main product is [AMU 2002] |
| A. | Ethane |
| B. | Methane |
| C. | Propane |
| D. | Butane |
| Answer» B. Methane | |
| 8241. |
Which of the following monosaccharide is a pentose [CPMT 1982, 87, 89, 93] |
| A. | Galactose |
| B. | Glucose |
| C. | Fructose |
| D. | Arabinose |
| Answer» E. | |
| 8242. |
Glucose when heated with \[C{{H}_{3}}OH\] in presence of dry HCl gas gives \[\alpha \] and \[\beta -\text{methyl}\] glucosides because it contains [CPMT 1982, 85] |
| A. | An aldehyde group |
| B. | A \[-C{{H}_{2}}OH\] group |
| C. | A ring structure |
| D. | Five hydroxyl groups |
| Answer» D. Five hydroxyl groups | |
| 8243. |
Calcium carbide on reacting with water gives [CBSE PMT 1991; MP PMT 1993, 94; RPMT 2002; J & K 2005] |
| A. | Methane |
| B. | Ethane |
| C. | Ethene |
| D. | Acetylene |
| Answer» E. | |
| 8244. |
The total number of neutrons in dipositive zinc ions with mass number 70 is [IIT 1979; Bihar MEE 1997] |
| A. | 34 |
| B. | 40 |
| C. | 36 |
| D. | 38 |
| Answer» C. 36 | |
| 8245. |
Parke's process is used to extract [MP PMT 2002] |
| A. | Silver using \[NaCN\] |
| B. | Copper using \[CuFe{{S}_{2}}\] |
| C. | Silver from argentiferrous lead |
| D. | Silver by forming amalgam |
| Answer» D. Silver by forming amalgam | |
| 8246. |
The indicator used in the titration of iodine against sodium thiosulphate is [AFMC 2002] |
| A. | Starch |
| B. | \[{{K}_{3}}Fe{{(CN)}_{6}}\] |
| C. | \[{{K}_{2}}Cr{{O}_{4}}\] |
| D. | Potassium |
| Answer» B. \[{{K}_{3}}Fe{{(CN)}_{6}}\] | |
| 8247. |
The work done to contract a gas in a cylinder, is 462 joules. 128 joule energy is evolved in the process. What will be the internal energy change in the process [MP PMT 2003] |
| A. | + 590 joules |
| B. | ? 334 joules |
| C. | + 334 joules |
| D. | ? 590 joules |
| Answer» D. ? 590 joules | |
| 8248. |
In its reaction with silver nitrate acetylene shows [MP PET 1999] |
| A. | Oxidising property |
| B. | Reducing property |
| C. | Basic property |
| D. | Acidic property |
| Answer» E. | |
| 8249. |
In the nuclear reaction \[_{92}{{U}^{238}}{{\to }_{82}}P{{b}^{206}}\], the number of alpha and beta particles decayed are [DPMT 1983; MNR 1985; Roorkee Qualifying 1998] |
| A. | \[4\alpha ,\,3\beta \] |
| B. | \[8\alpha ,\,6\beta \] |
| C. | \[6\alpha ,\,4\beta \] |
| D. | \[7\alpha ,\,5\beta \] |
| Answer» C. \[6\alpha ,\,4\beta \] | |
| 8250. |
Which of the following is a poor conductor of electricity [EAMCET 1992] |
| A. | \[C{{H}_{3}}COONa\] |
| B. | \[{{C}_{2}}{{H}_{5}}OH\] |
| C. | \[NaCl\] |
| D. | \[KOH\] |
| Answer» C. \[NaCl\] | |