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

• 15 A
• 15 i B
• -15 i C
• -15 D

What is the conjugate of -6 -i

• -6 +i A
• 6 + i B
• -6 -i C
• 6 -i D

Which of the following sets has closure property w.r.t. addition

• { 0 } A
• { 1 } B
• { 0, -1} C
• { 1, -1} D

• 
  
  
  A
• 
  B
• 
  C
• 
  D

Any recurring decimal represents a

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

• 
  A
• 
  B
• 
  C
• 
  D

2.333....is a

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

If Z = (1,2), then Z^-1= ?

• (0.2, 0.4) A
• (-0.2, 0.4) B
• (0.2, -0.4) C
• (-0.2, -0.4) D

• 
  A
• 
  B
• 
  C
• 
  D
• 
  E

Such fraction which can not be written in the form ofp⁄q where p,q and q≠ 0,such fractions are called.

• Fractinal numbers A
• Rational Numbers B
• Even Numbers C
• Whole Numbers D

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

The square roots of negative numbers is called

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

• 1 A
• -1 B
• 
  C
• 
  D

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

• 
  A
• 
  B
• 
  C
• 
  D

Name the property used in 100 + 0 = 100

• Additive inverse A
• Multiplicative inverse B
• Additive identity C
• Multiplicative identity D

QUQ, =

• N A
• R B
• W C
• Z D

• 
  A
• 
  B
• 
  C
• 
  D

A prime number can be a factor of a square only if it occurs in the square at least

• Once A
• Thirce B
• Twice C
• None of these D

• -3 -2i A
• 3 +2i B
• 1 + 2i C
• 1 - 2i D

• 
  A
• 
  B
• 
  C
• 
  D

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

• √3 i A
• √7 B
• -2-i C
• √5 D

• A rational number A
• An irrational number B
• An odd number C
• A prime number D

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

Additive inverse of - a - b is

• a A
• -a + b B
• a - b C
• a + b D

• Additive property in R A
• Multiplication property in R B
• Cancellation property in R C
• Distribution property in R D

Every natural number is

• A prime number A
• An irrational number B
• An integer C
• An even number D

√x = ______ if is a prime number

• Rational no A
• Natural no B
• Irrational no C
• Complex no D

(a^-1)^-1=

• a^-1 A
• a B
• -a C
• None of above D

The multiplicative inverse of 1 is

• 1 A
• -1 B
• 0 C
• Does not exist D

Union of the sets of rational and irrational numbers is called 6th set of

• Natural numbers A
• Real numbers B
• Whole numbers C
• Prime numbers D