ECAT Pre Engineering MCQ Test With Answer for Chapter 1 Mathematics

The order axioms are satisfied by set of

• C A
• C and R B
• R C
• None of these D

O is ______

• A positive integer A
• A negative integer B
• A natural number C
• An integer D

If z₁ =√-36 ,z₂ =√-25,z3 =√-16 then

• 15 A
• 15i B
• -15i C
• -15 D

The square root of 2i - 20i is

• +-(5 - 2i) A
• +-(5 + 2i) B
• (5 - 2i) C
• None of these D

Name the property used in 4 x (5 x 8) = ( 4 x 5) x 8

• Associative property of addition A
• Associative property of multiplication B
• Additive identity C
• Multiplicative identity D

• Associative property of addition A
• Associative property of multiplication B
• Commutative property of addition C
• Commutative property of multiplication D

• Trichotomy property A
• Additive property of inequality B
• Transitive property C
• Multiplicative property D

The identity element with respect to subtraction is

• 0 A
• -1 B
• 0 and 1 C
• None of thes D

• 
  A
• 
  B
• 
  C
• 
  D

• z is purely imaginary A
• a is any complex number B
• z is real C
• None of these D

The square roots of negative numbers is called

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

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

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

The conjugate of √5 i is

• √5 A
• -√5 i B
• i C
• 5i D

√25 is a number

• Rational A
• Irrational B
• Natural C
• Odd D

24 can be written as a product of

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

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

I is not

• Real number A
• Natural number B
• Prime Number C
• Whole Number D

√2 is a number

• Rational A
• Irrational B
• Even C
• Odd D

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

• √3 i A
• √7 B
• -2-i C
• √5 D

• N A
• r B
• 2r C
• π D

(a,b) +(-a,-b) =

• (0,0) A
• (a,b) B
• (-a,-b) C
• (1,1) D

The multiplicative inverse of -3i is

• 3i A
• -3i B
• -1/3i C
• 1/3 i D

• 
  A
• 
  B
• 
  C
• 
  D

• 15 A
• 15 i B
• -15 i C
• -15 D

Every real number is

• A complex number A
• A rational number B
• A natural number C
• A prime number D

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

Every irrational number is

• A real number A
• A prime number B
• A natural number C
• An integer D

• 
  A
• 
  B
• 
  C
• 
  D