Important Questions of Relations and Functions Mathematics | Zigya

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 Multiple Choice QuestionsShort Answer Type

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341. Determine whether each of the following relations are reflexive, symmetric and transitive :

(v) Relation R in the set A of human beings in a town at a particular time given by

(a)    R = {(x, y) : x and y work at the same place}

(b)    R = {(x,y) : x and y live in the same locality}

(c)    R = {(x, y) : x is exactly 7 cm taller than y}

(d)    R = {(x, y) : x is wife of y}

(e)    R = {(x,y) : x is father of y}

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342. Show that the relation R in the set {1, 2, 3} given by R = {(1, 2), (2, 1)} is symmetric but neither reflexive nor transitive.
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343. Give an example of a relation which is
(i) Symmetric but neither reflexive nor transitive.
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344. Give an example of a relation which is
(ii) Transitive but neither reflexive nor symmetric.
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345. Give an example of a relation which is
(iii) Reflexive and symmetric but not transitive.
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346. Give an example of a relation which is
(iv) Reflexive and transitive but not symmetric.
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347. Give an example of a relation which is
(v) Symmetric and transitive but not reflexive.
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348.

Show that the relation R defined in the set A of all triangles as R = {(T1, T2) : T1 is similar to T2}, is equivalence relation. Consider three right angle triangles T1 with Sides 3, 4, 5, T2 with sides 5, 12, 13 and T3 with sides 6, 8. 10. Which triangles among T1, T2 and T3 are related ?

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349. Show that the relation R defined in the set A of all polygons as R = {(P1, P2) P1 and P2 have same number of sides}, is an equivalence relation. What is the set of all elements in A related to the right angle T with sides 3, 4 and 5 ?
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 Multiple Choice QuestionsLong Answer Type

350. Let L be the set of all lines in XY plane and R be the relation in L defined as R = {(L1, L2) : L1 is parallel to L2}. Show that R is an equivalence relation. Find the set of all lines related to the line y = 2 x + 4.
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