Polynomials Test-02

Polynomials Test-02

This is Polynomials Test-02 for CBSE class 10 Maths.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
If ‘α’ and ‘β’ are the zeroes of a quadratic polynomial\({x^2} + {\text{ }}5x{\text{ }}--{\text{ }}5\) , then
  • A
    \(\alpha {\text{ }} + {\text{ }}\beta {\text{ }} < {\text{ }}\alpha \beta \)
  • B
    \(\begin{array}{*{20}{l}} {\alpha {\text{ }}--{\text{ }}\beta {\text{ }} = {\text{ }}\alpha \beta } \end{array}\)
  • C
    \(\alpha {\text{ }} + {\text{ }}\beta {\text{ }} > {\text{ }}\alpha \beta \)
  • D
    \(\begin{array}{*{20}{l}} {\alpha {\text{ }} + {\text{ }}\beta {\text{ }} = {\text{ }}\alpha \beta } \end{array}\)
    Correct
2
If ‘\(\alpha \) ’ and ‘\(\beta \) ’ are the zeroes of a quadratic polynomial \({x^2}--{\text{ }}5x{\text{ }} + {\text{ }}b\) and\(\alpha {\text{ }}--{\text{ }}\beta {\text{ }} = {\text{ }}1\) , then the value of ‘b’ is
  • A
    – 5
  • B
    – 6
  • C
    5
  • D
    6
    Correct
3
If one zero of the quadratic polynomial ${x^2} + {\text{ }}3x{\text{ }} + {\text{ }}k$ is 2, then the value of ‘k’ is
  • A
    – 5
  • B
    5
  • C
    10
  • D
    – 10
    Correct
4
If two of the zeroes of a cubic polynomial \(a{x^3} + b{x^2} + cx + d\) are zero, then the third zero is
  • A
    \(\frac{d}{a}\)
  • B
    \(\frac{b}{a}\)
  • C
    \(\frac{{ - b}}{a}\)
    Correct
  • D
    \(\frac{c}{a}\)
5
A quadratic polynomial whose zeroes are – 3 and 6, is
  • A
    ${x^2} - 3x + 18$
  • B
    ${x^2} + 3x + 18$
  • C
    $\frac{{{x^2}}}{6} - \frac{x}{2} - 3$
    Correct
  • D
    ${x^2} + 3x - 18$
6
The zeroes of a polynomial \({x^2} + 5x + 6\) are
  • A
    both equal
  • B
    both positive
  • C
    one positive and one negative
  • D
    both negative
    Correct
7
The zeroes of a polynomial \({x^2} + 5x - 24\) are
  • A
    both equal
  • B
    both negative
  • C
    both positive
  • D
    one positive and one negative
    Correct
8
The zeroes of a polynomial \({x^2} - 7x + 12\) are
  • A
    both negative
  • B
    one positive and one negative
  • C
    both positive
    Correct
  • D
    both equal
9
The zeroes of a polynomial \({x^2} + 4x + 4\) are
  • A
    both equal
    Correct
  • B
    both negative
  • C
    both positive
  • D
    one positive and one negative
10
If the zeroes of a quadratic polynomial ax2 + bx + c, c ≠ 0 are equal, then
  • A
    b and c have opposite sign
  • B
    b and c have the same sign
  • C
    c and a have opposite sign
  • D
    c and a have the same sign
    Correct
11
If a real number ‘\(\alpha \) ’ is a zero of a polynomial, then ______ is a factor of f(x).
  • A
    \(x \pm \alpha \)
  • B
    none of these
  • C
    \(x + \alpha \)
  • D
    \(x - \alpha \)
    Correct
12
If ‘\(\alpha \)’ and ‘\(\beta \)’ are the zeroes of the polynomial \(3{x^2} + 11x - 4\), then the value of \({\alpha ^2} + {\beta ^2}\) is
  • A
    \(\frac{{144}}{9}\)
  • B
    \(\frac{{145}}{9}\)
    Correct
  • C
    \(\frac{{150}}{9}\)
  • D
    none of these
13
If ‘\(\alpha \)’ and ‘\(\beta \) are the zeroes of the polynomial \(3{x^2} + 11x - 4\), then the value of \(\frac{1}{\alpha } + \frac{1}{\beta }\) is
  • A
    \(\frac{{12}}{4}\)
  • B
    none of these
  • C
    \(\frac{{13}}{4}\)
  • D
    \(\frac{{11}}{4}\)
    Correct
14
If ‘\(\alpha \)’ and ‘\(\beta \)’ are the zeroes of the polynomial \({x^2} - 6x + 8\), then the value of \({\alpha ^3} + {\beta ^3}\) is
  • A
    80
  • B
    72
    Correct
  • C
    74
  • D
    76
15
If ‘\(\alpha \)’ and ‘\(\beta \)’ are the zeroes of the polynomial \({x^2} - 6x + 8\), then the value of \(\frac{{{\alpha ^2}}}{\beta } + \frac{{{\beta ^2}}}{\alpha }\) is
  • A
    8
  • B
    9
    Correct
  • C
    12
  • D
    6