Assesment-XC

Every _______ number can be expressed ( factorised) as a product of primes, and this factorisation is ______, apart from the order in which the prime factors occur.

• natural, unique

• Prime , unique

• Composite, Unique

• Rational , unique

The product of a non-zero rational and an irrational number is

• always irrational

• always rational

• rational or irrational

• one

• one decimal place

• two decimal places

• three decimal places

• four decimal places

Which of the following is not the graph of quadratic polynomial?

• A

• B

• C

• D

The number of polynomials having zeroes as –2 and 5 is

• 1

• 2

• 3

• more than 3

One equation of a pair of dependent linear equations is –5x + 7y = 2. The second equation can be

• (A) 10x + 14y + 4 = 0

• (B) –10x – 14y + 4 = 0

• (C) –10x + 14y + 4 = 0

• (D) 10x – 14y = –4

If the lines given by 3x + 2ky = 2 and 2x + 5y + 1 = 0 are parallel, then the value

of k is

• A : -5/4

• B : 2/5

• C : 15/4

• D : 3/2

The pair of equations x = a and y = b graphically represents lines which are

• (A) parallel

• (B) intersecting at (b, a)

• (C) coincident

• (D) intersecting at (a, b)

If a pair of linear equations is consistent, then the lines will be

• (A) parallel

• (B) always coincident

• (C) intersecting or coincident

• (D) always intersecting