Only One Option Correct Type
This section contains 7 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Consider the following species.
I. Mg(s)
II. TiO(s)
III. I2(s)
IV. H2O (s)
Q.
Which of the above solids is/are electrical conductor?
Which kind of defects are introduced by doping?
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Silicon doped with electron-rich impurity forms
Select the correct matching.
Which of the following oxides behaves as conductor or insulator depending upon temperature?
How many energy levels are present in 3s conduction band of a single crystal of sodium weighing 26.8 mg?
In which of the following oxides conducting or insulating property of is dependent on temperature?
One or More than One Options Correct Type
This section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.
Select the correct statement(s) about the movement of electrons and holes in a p-type semiconductor when an electric field is applied.
Select the correct statement(s).
Which of the following oxides behaves as conductor or insulator depending upon temperature?
Select the correct statement(s).
Germanium has been doped with impurity as shown in I, II, III, IV. Select the correct statement(s).
Direction (Q. Nos. 13-17) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.
Q.
Statement I : Graphite is a good conductor of electricity.
Statement II : In graphite, carbon atom is sp2 hybridised.
Statement I : A ferromagnetic substance becomes a permanent magnet, when it is placed in a magnetic field.
Statement II : All the domains get oriented in the direction of magnetic field.
Statement I : In the case of anti-ferrom agnetic substances, magnetic moment is zero.
Statement II : Domains get oriented in the direction of applied magnetic field.
Statement I : The electrical conductivity of a metal decreases as temperature increases.
Statement II : This impedes the flow of electrons, when an electric field is applied.
Statement I : Electrical conductivity of semiconductors increases with rise in temperature.
Statement II : There is a small energy gap between conduction band and valence band.
Direction (Q . No. 18) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.
Q.
Match the items in Column I with the terms in Column II and select the answer from the codes given:
Direction (Q. Nos. 19 and 20) This section contains 1 paragraph, which describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).
Passage
The following pictures show the electrons population of the composite s-d bands for three transition metals :
Metals with the highest and lowest melting points respectively are
Passage
The following pictures show the electrons population of the composite s-d bands for three transition metals :
Hardness of the metals in the increasing order is
Direction (Q. Nos. 21-24) This section contains 4 questions. When worked out will result in an integer from 0 to 9 (both inclusive).
Q.
How many of the following species show paramagnetism?
TiO2 , VO, V2O5 , NaCl, C6H6 , H2O, CH3COCH3, CuCl
Magnetic moment of a compound showing paramagnetism is 54.842 x 10-24 Am2 (Bohr magneton). How many unpaired electrons are there in the compound?
How many of the following are diamagnetic in nature?
How many of the following are antiferromagnetic substances?
MnO, MnO2, Mn2O, FeO, Fe2O3, NiO ,Cr2O3, CoO, Co3O4 , H20, NaCl, C6H6
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