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If an electric dipole is kept in a uniform electric field then resultant electric force on it is :
Anonymous Quiz
64%
(a) always zero
19%
(b) never zero
15%
(c) depend upon capacity of dipole
2%
(d) None
π₯°1
The work done in rotating an electric dipole in an electric field:
Anonymous Quiz
48%
(a) W = ME (1 β cos ΞΈ)
30%
(b) W = ME tan ΞΈ
9%
(c)W = ME sec ΞΈ
13%
(d) None
π±1
How many chloride ions are surrounding sodium ion in sodium chloride crystal ?
Anonymous Quiz
41%
(a) 4
31%
(b) 8
21%
(c) 6
7%
(d) 12
Alkali halids do not show Frenkel defect because
Anonymous Quiz
33%
(a) cations and anions have almost equal size
45%
(b) there is a large difference in size of cations and anions
18%
(c) cations and anions have low coordination number
4%
(d) anions cannot be accommodated in voids
π1
What type of a relation is R = {(1, 3), (4, 2), (2, 4), (2, 3), (3, 1)} on the set A β {1, 2, 3, 4}
Anonymous Quiz
24%
(a) Reflexive
33%
(b) Transitive
31%
(c) Symmetric
12%
(d) None of these
β‘1π₯°1π€¬1
Let E = {1, 2, 3, 4} and F = {1, 2} Then, the number of onto functions from E to F is
Anonymous Quiz
13%
(a) 14
40%
(b) 16
17%
(c) 12
30%
(d) 8
If A, B and C are three sets such that A β© B = A β© C and A βͺ B = A βͺ C. then
Anonymous Quiz
34%
(a) A = B
36%
(b) A = C
16%
(c) B = C
13%
(d) A β© B = d
Which of the following crystals does not exhibit Frenkel defect?
Anonymous Quiz
24%
(a) AgBr
38%
(b) AgCl
24%
(c) KBr
15%
(d) ZnS
β€2π1
What type of stoichiometric defect is shown by ZnS?
Anonymous Quiz
20%
(a) Schottky defect
34%
(b) Frenkel defect
30%
(c) Both Frenkel and Schottky defects
16%
(d) Non-stoichiometric defect
π€©1
Let us define a relation R in R as aRb if a β₯ b. Then R is
Anonymous Quiz
21%
(a) an equivalence relation
42%
(b) reflexive, transitive but not symmetric
25%
(c) neither transitive nor reflexive but symmetric
12%
(d) symmetric, transitive but not reflexive
π₯°1
Let A = {1, 2, 3} and consider the relation R = {(1, 1), (2, 2), (3, 3), (1, 2), (2, 3), (1, 3)}. Then R is
Anonymous Quiz
40%
(a) reflexive but not symmetric
29%
(b) reflexive-but not transitive.
22%
(c) symmetric and transitive
8%
(d) neither symmetric, nor transitive