Important Questions of Algebra Mathematics | Zigya

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21.

The equation whose roots are p-qp+qand -p+qp-q will be

  • p2+q2x2+8pqx-2(p+q)2=0

  • p2q2x2+pqx +2(p+q)2=0

  • p2-q2x2+4pqx-p2+q2=0

  • p2q2x2+pqx +p+q2=0


22.

If A and B are non- empty subsets of a set C, then  A(AB) is equal to 

  • AB

  • AB

  • A

  • B


23.

The population of a village increases by 5% yearly. If at present the population of the village is 4410, then what was the population before two years?

  • 4420

  • 4430

  • 4440

  • 4000


24.

A company makes an advertisement of shares to collect a capital of 25 lakh. If the printed price of one share is 100, then find the number of shares circulated by the company.

  • 20000

  • 25000

  • 30000

  • 15000


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25.

If x=2, y=1, z=-3, then x3+ y= z3- 3xyz equals

  • 6

  • 2

  • 8

  • 0


26.

In a religious gathering, the ratio of the number of ladies to that of gents was 3:2. When 20 more gents joined, the ratio was reversed. The number of ladies was

  • 36

  • 40

  • 16

  • 24


27.

For three non-zero real numbers a, b, c if a2=b3=c4=2a-3b+5ck

  • 10

  • 15

  • 20

  • 25


28.

If A and B be any two sets such that A/B= A, then AB is

  • ϕ

  • A

  • B

  • AB


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29.

If the roots of the equation x2-bx+c=0 are two consecutive integers, then b2- 4c is

  • 1

  • -1

  • 0

  • 2


30.

Jatin buys an article for 10% less than its value and sells it for 10% more than its value. His gain is

  • 20 %

  • 2279%

  • 2229%

  • None of these


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