Mains 10 Vmc

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    Question 1.

    Identify the alkane that has the lower carbon-carbon bond dissociation energy.

    [A] Ethane[B] Propane[C] 2-Methyl propane[D] 2, 2-Dimethyl propane

    Question 2.Which of the following four isomeric alkenes is most stable?

    [A] 1-Hexene[B] 2-Hexene[C] 2-Methylpent-2-ene[D] 2, 3-Dimethyl-but-2-ene

    Question 3.

    An optically active unsaturated hydroc arbon that yield, optically inactive saturated hydroc arbon on catalytic hydrogenation is

    [A] only (I)[B] (I), (II)[C] (I), (III)[D] (II), (III)

    Question 4.

    Which of the following metal carbide on hydrolysis gives simplest saturated hydrocarbon?

    [A]

    [B]

    [C]

    [D] None

    Question 5.

    Sodium salts of carboxylic acids on heating with sodalime give alkanes. Sodium salt of which acid will be needed for the preparation ofpropane?

    [A] Propanoic acid[B] Butanoic acid[C] Propenoic acid[D] 2-Methyl propanoic acid

    Question 6.

    Which of the following has lowest boiling point?

    [A] Butane[B] 2-Methyl propane[C] 2-Methyl butane[D] 2, 2-Dimethyl propane

    Question 7.

    Which of the following reaction cannot be used for preparation of methane [R=Methyl]

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    [A] only I[B] I, III[C] I, III, IV[D] II, III, IV

    Question 8.

    Halogenation of alkane is proceed via

    [A] Electrophilic substitution mechanism[B] Free radical addition mechanism[C] Electrophilic addition mechanism[D] Free radical substitution mechanism

    Question 9.

    Which of the following reaction(s) results in formation of benzene?

    [A] only I[B] I, II, IV[C] I, II, III, IV[D] I, III

    Question 10.

    Which of the following alkane on monochlorination gives only two monochloro derivatives?

    (I) (II)

    (III) (IV)

    [A] only (I)[B] (I), (II), (IV)[C] (II), (IV)[D] (III), (IV)

    Question 11.

    Identify the major product Mformed in the given reaction

    [A]

    [B]

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    [C]

    [D]

    Question 12.

    In which of the following reaction only cis-isomer of the product 2-Butene is formed.

    [A]

    [B]

    [C]

    [D]

    Question 13.

    Which of the following reagent can be used to distinguish product N and Pof the following reaction?

    [A]

    [B] cold dil, alk.

    [C] both (A) & (B)

    [D]

    Question 14.

    Which of the following reaction(s) results in formation of acetaldehyde ?

    (I)

    (II)

    (III)

    (IV)

    [A] only IV[B] II, IV[C] I, III, IV[D] I, III

    Question 15.

    Which of the following compound gives 2-ketopropanal and formaldehyde as only products on reductive ozonolysis?

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    [A]

    [B]

    [C]

    [D]

    Question 16.

    For electrophilic substitution reaction of chlorobenzene, chlorine atom acts as

    [A] activating and o,p-directing[B] activating and m-directing[C] deactivating and m-directing[D] de-activating and o,p-directing

    Question 17.

    Identify end product R in following sequence of reactions

    [A]

    [B]

    [C]

    [D]

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    Question 18.

    Out of benzene, m-dinitro benzene, toluene and phenol which will undergo nitration most easily?

    [A] benzene[B] m-dinitrobenzene[C] toluene[D] phenol

    Question 19.

    An alkene 'A' on ozonolysis gives a mixtur e of ethanal and pentan-3-one. Addition of HBr to alkene 'A' in the pres ence of benz yol peroxide

    yields[A] 3-Bromo-2-ethyl pentane[B] 2-Bromo-3-ethyl pentane[C] 3-Bromo-3-ethyl pentane[D] 2-Bromo-2-ethyl pentane

    Question 20.

    Selenium is a semiconductor used in photocopying machines. What type of semiconductor would be formed if a small amount ofindium(In) impurity were added to pure selenium(Se)?

    [A] substitutional type[B] p-type[C] n-type[D] None of these

    Question 21.

    Which of the following is NOT a molecular solid?

    [A] Silica

    [B] Fullerene

    [C] Sulphur

    [D] Solid HI

    Question 22.

    Which of the following is correct set of effective number of constituents and number of nearest neighbours for simple cubic(SC), bodycentered cubic (BCC) and face centered cubic (fcc) unit cell respectively

    [A]SC BCC FCC

    8, 6 9, 8 14, 12[B] 1, 6 2, 8 6, 6[C] 1, 4 2, 8 4, 12[D] 1, 6 2, 8 4, 12

    Question 23.

    Which of the following is correct pair of ionic solid and number of formula units per unit cell?

    (I) Rock salt : Six formula units

    (II) Zinc blende : Four formula units

    (III) Cesium halide : Two formula units

    [A] only (II)[B] (II) and (III)[C] (I) and (II)[D] (I), (II) and (III)

    Question 24.

    Which of the following statement(s) is/are NOT correct for cubic closest packing of spheres of identical size?

    (I) It is ABCABCABC.........type of 2-D closest packing

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    (II) It is ABABAB ....... type of 3-D closes t packing

    (III) Void fraction in this packing is 0.26

    (IV) In this packing co-ordination number is 12

    (V) There are twice as many tetrahedral holes as there are packed spheres in the closest pack ed structure.

    [A] (II), (V)[B] (I) and (V)[C] (I) and (II)[D] (III), (IV) and (V)

    Question 25.

    Cobalt fluoride crystallizes in a closest packed array of fluoride ions, with the cobalt ions filling one-half of the octahedral holes. What isthe formula of this compound?

    [A]

    [B]

    [C]

    [D]

    Question 26.

    Tetragonal crystal system has the following unit cell dimensions.

    [A]

    [B]

    [C]

    [D]

    Question 27.

    The number of atoms in 100 g of an FCC crystal with density d = 10 g cm -3and cell edge as 200 pm is equal to

    [A]

    [B]

    [C]

    [D]

    Question 28.

    What type of solid is generally characterized by having low melting point and low electrical conductivity?

    [A] ionic[B] metallic[C] molecular[D] network covalent

    Question 29.

    Which of the following has lowest enthalpy change of hydrogenation?

    [A]

    [B]

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    [C]

    [D]

    Question 30.What is the volume of unit cell in ABAB.......type of 3-D closest packing?

    [A]

    [B]

    [C]

    [D]

    Question 31.

    Consider the following circuit. The curr ent through the resistor is :

    [A] 1A[B] 1.5A[C] 0.5A[D] 2.5A

    Question 32.

    A 40Wand a 60Wbulbs give a total power of 80Wwhen connected in parallel across a source. When connected in series with the samesource, the total power will be :

    [A] 19.2 W[B] 24 W[C] 30 W[D] 25.6 W

    Question 33.

    A uniform solid c ylinder of base area 'A' is placed with its axis alongxaxis and one of the bases at the origin. The resistively of the

    material changes acc ording to the relation . (L= length of cy linder, is a positive constant) Resistance of the solid

    cylinder, across its ends is :

    [A]

    [B]

    [C]

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    [D]

    Question 34.

    A dipole is placed in an electr ic field whose direction is fixed but whose magnitude v aries with distance. Which is not possible that thedipole experiences.

    [A] No net force and no torque[B] A net force but no torque

    [C] A net force and a torque[D] No net force but a torque

    Question 35.

    The resistance of the all the wires between any two adjacent dots is R.

    Then equivalent resistance betweenAand Bas shown in figure is:

    [A] 7/3 R[B] 7/6 R[C] 14/8 R[D] None of these

    Question 36.

    In the circuit shown, what is the potential difference ?

    [A] + 3V[B] + 2V

    [C]

    [D] None of these

    Question 37.

    Two bulbs rated are connected in series to a 440 Vline. Which one is likely to fuse?

    [A] 25 Wbulb[B] 100 Wbulb[C] both bulbs[D] None of these

    Question 38.

    In the given potentiometer circuit length of the wire AB is 3mand its resistanc e is . The lengthACfor no deflection in

    galvanometer is :

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    [A] 2 m[B] 1.8 m

    [C] dependent or r1

    [D] None of these

    Question 39.

    Find reading of ammetersA1 andA2for the circuit shown assuming them to be ideal.

    [A] 1A, 1A[B] 1A, Zero[C] Zero, 1A[D] Zero, zero

    Question 40.

    In the circuit shown the curr ents in resistance are :

    [A]

    [B]

    [C]

    [D]

    Question 41.

    An ammeter and a voltmeter ar e c onnected in series to a battery with emf E= 6 volt and negligible resistance. When a resistance

    is connected in parallel to voltmeter, reading of ammeter increases three times while that of voltmeter reduces to one third.

    The resistance of ammeter is :

    [A]

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    [B]

    [C]

    [D]

    Question 42.

    An ammeter and a voltmeter ar e c onnected in series to a battery with emf E= 6 volt and negligible resistance. When a resistance

    is connected in parallel to voltmeter, reading of ammeter increases three times while that of voltmeter reduces to one third.

    The resistance of voltmeter is :

    [A]

    [B]

    [C]

    [D]

    Question 43.

    Twelve wires, each having equal resistance r, are joined to form a cube as shown in the figure. Find the equivalent resistance between

    the diagonally opposite points a and f.

    [A]

    [B]

    [C]

    [D] None of these

    Question 44.

    Each resistor shown in figure of an infinite network of resistance . The effective resistance in between Aand Bis: