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Topic: NUMBER SYSTEMS :Important Questions Answers/ MCQ's Tests, Quiz, Practise tests,  (Read 2306 times)
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« on: February 05, 2011, 09:25:59 AM »

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NUMBER SYSTEMS :Important Questions Answers/ MCQ's Tests, Quiz, Practise tests, Mock papers, Revision Tests and for other exams:

1. If x < y, y < z then
1. x > z
2. x < z
3. x = z
4. none of these
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2. The conjugate of – 6 + 3i
1. – 6 – 3i
2. – 6 + 3i
3. 6 + 3i
4. 6 – 3i
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3. The solution set of 5x + 8 = 0 when x  N is
1. non empty set
2. -8/5
3. 8/5
4. empty set
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4. The conjugate of a complex number 5i
1. – 5
2. 5i
3. – 5i
4. 5
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5. The property used in this equation 3 x 7 = 7 x 3 is called
1. Closure law
2. Commutative law for addition
3. Commutative property w.r.t multiplication
4. Identity
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6. The additive inverse of (-x, -y) is
1. (-x, -y)
2. (x, y)
3. (-x, 0)
4. (x, -y)
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7. The property used in the equation 8 + 0 = 8 is called
1. Commutative
2. Associative
3. Additive Identity
4. Additive Inverse
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8. The inverse of an element ‘a’ under addition is
1. 1/a
2. -a
3. 1
4. 0
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9. The additive identity is
1. 0
2. -1
3. 1
4. none of these
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10. The product of two conjugate complex numbers is always a
1. Real number
2. Complex number
3. Irrational number
4. Natural number
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11. The sum of two conjugate complex numbers is always a
1. Real number
2. Irrational number
3. Complex number
4. Natural number
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12. If z1 = (a, b) and z2 = (c, d) then z1z2 =
1. (ac – bd, ad + bc)
2. (ac + bd, cd – bc)
3. (ad + bc, ac – bd)
4. (ad – bd, ac + bd)
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13. The complex No. (a + ib) can be written as ______
1. (a, ib)
2. {a, b}
3. (a, b)
4. [a, b]
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14. The imaginary part of the complex Nos. (b, a) is ______
1. ia
2. b
3. a
4. none
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15. The magnitude of (1+2i)/(2-i) is _________
1. 5 + 2i
2. -1
3. 1
4. none
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16. If x = 0, then multiplicative inverse of x is _______
1. 1/x
2. -x
3. 1
4. 0
5. none
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17. A real number is always
1. a natural no
2. positive integer
3. Rational number
4. complex number
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18. The property used in the equation 7.8 + (- 7.Cool = 0 is
1. Commutative
2. Associative
3. Additive Identity
4. Additive inverse
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19. Two numbers when divided by a certain divisor leave remainders of 431 and 379 respectively. When the sum of these two numbers is divided by the same divisor, the remainder is 211. What is the divisor?
1. 599
2. 1021
3. 263
4. Cannot be determined
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20. Find the range of real values of x satisfying the inequalities 3x - 2 > 7 and 4x - 13 > 15.
1. x > 3
2. x > 7
3. x < 7
4. x < 3
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