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

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

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

√(-1b) =?

• b i A
• -i b B
• b2 C
• i√b D

The multiplicative inverse of (a,b) is

• 
  A
• 
  B
• 
  C
• 
  D

∀a,b ε R, ab = be is a

• Commutative law of multiplication A
• Closure law of multiplication B
• Associative law of multiplication C
• Multiplicative identity D

i^-(4n+2) = -------------------------------

• 1 A
• i B
• -1 C
• -i D

The equation |x + 4| = x has solution

• x = -2 A
• x = 2 B
• x = -4 C
• x = 4 D

• 
  A
• 
  B
• 
  C
• 
  D

• Principle of equality of fractions A
• Rule for product of fraction B
• Rule for quotient of fraction C

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

The identity element with respect to subtraction is

• 0 A
• 1 B
• -1 C
• Does not exist D

The square root of every incomplete square is an

• Rational numbers A
• Even numbers B
• odd numbers C
• Irrational numbers D

The sum of complex number (a,b) and (c,d) is

• 
  A
• 
  B
• 
  C
• 
  D

There is no element common in

• N and W A
• E and W B
• N and O C
• Q and Q' 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

What is the conjugate of -7 -2i?

• -7 + 2i A
• 7 + 2i B
• 7 -2i C
• None of these D

• Associate law of addition A
• Commutative law of addition B
• Additive identity C
• Closure law of addition D

• Closure law of addition A
• Closure law of multiplication B
• Commutative law of addition C
• Commutative law of multiplication D

• a = a A
• a < a B
• a > a C
• a²= a D

O is ______

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

3/4 is ______

• An odd number A
• An even number B
• A natural number C
• A rational number D

√2 is a number

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

• are real no A
• both are not real B
• are imaginary no C
• both are imaginary D

The set {1,2,3,4......} is called

• Set of natural numbers A
• Set of whole numbers B
• Set of rational number C
• Set of irrational numbers 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

• 
  A
• 
  B
• 
  C
• 
  D

• Principle of equality of Fractions A
• Rule for product of fraction B
• Golden rule of fraction C
• Rule of quotient of Fraction D

a.a^-1 = a^-1.a = 1 is a

• Commutative law of multiplication A
• Multiplicative identity B
• Associative law of multiplication C
• Multiplicative inverse D

The set { 1 , -1} is closed w.r.t.

• Addition A
• Multiplications B
• Subtraction C
• None of these D

In R, the multiplicative inverse of a is

• 0 A
• 1 B
• -a C
• 1/a D

Name the property used in 1000 x 1 = 1000

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