ECAT Pre General Science MCQ Test With Answer for Mathematics Chapter 1

• A rational number A
• A natural number B
• An irrational number C
• An integer D

Name the property used in 4 + 9 = 9 + 4

• Associative property of addition A
• Commutative property of addition B
• Distributive property C
• Additive identity D

If z=(x,y) then z has no multiplicative inverse when

• x ≠ 0, y = 0 A
• x = 0, y = 0 B
• x = 0, y ≠ 0 C
• None of these D

2/9,5/7∈ R,(2│9)(5│7)=10/63∈R this property is called

• Associative property A
• Identity property B
• Commutative property C
• Closure property w.r.t multiplication D

3/2 is

• An irrational number A
• Whole number B
• A positive integer C
• A rational number D

Which element is the additive inverse of (a, b) in Complex numbers?

• (a, 0) A
• (0, b) B
• (a, b) C
• (-a, -b) D

The square roots of negative numbers is called

• Real no A
• Complex no B
• Positive no C
• Negative no D

Multiplicative inverse of "1" is

• 0 A
• ±1 B
• 1 C
• {0,1} D

2.333....is a

• Irrational no A
• Complex no B
• Rational no C
• None of these D

Geometrically the modulus of a complex number represents its distance from the

• Point (1,0) A
• Point (0,1) B
• Point (1,1) C
• Point (0,0) D

• Reflexive property A
• Symmetric property B
• Transitive property C
• Additive property D

The real number system contains.

• Positive Numbers A
• Negative numbers B
• Zero C
• (option a, b and c) D

The additive inverse of 1 is

• 1 A
• -1 B
• 0 C
• Does not exist D

If Z₁= 1 + i, Z₂= 2+3i, then |Z₁- Z₂| = ?

• 
  A
• 
  B
• 
  C
• 
  D

The multiplicative inverse of 1 is

• 1 A
• -1 B
• 0 C
• Does not exist D

• 
  A
• 
  B
• 
  C
• 
  D

• (a + b)c = ac + bc A
• a + b = b + a B
• (a + b) + c = a + (b + c) C
• a(b +c) = ab + ac D

i⁹ =

• i² A
• -1 B
• 1 C
• i D

Name the property used in 1000 x 1 = 1000

• additive inverse A
• multiplicative inverse B
• additive identity C
• multiplicative identity D

i =

• 
  A
• 
  B
• 
  C
• 
  D

• x A
• 
  B
• y C
• 
  D

√2 +√3 +√5) = (√2 +√3 +√5: this property is called

• associative property w.r.t addition A
• commutative property B
• Closure property w.r.t addition C
• Additive identity D

• real part of z A
• imaginary part of z B
• conjugate of z C
• modulus of z D

i¹⁰¹ =

• i A
• i² B
• -i C
• -1 D

The symbol of irrational is

• W A
• N B
• Q C
• Q' D

• additive property A
• multiplicative property B
• additive inverse C
• additive identity D

• 
  A
• 
  B
• 
  C
• 
  D

24 can be written as a product of

• Odd factors A
• Even factors B
• Whole factors C
• Prime factors D

What is the conjugate of -6 -i?

• -6 +i A
• 6+i B
• -6 -i C
• 6 -i D

If z₁ =√-36 ,z₂ =√-25,z3 =√-16 then

• 15 A
• 15i B
• -15i C
• -15 D