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

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

• 
  A
• 
  B
• 
  C
• 
  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

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

• (a,0) A
• (0,b) B
• (a,b) C
• (-a,-b) 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 0 = R, thenthe additive inverse of a is

• 1/9 A
• ^1/-9 B
• a C
• -a D

• x A
• 
  B
• y C
• 
  D

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

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

The equation |x + 4| = x has solution

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

The value of x, and y, when (x + iy)²= 5 + 4i

• X = 2, y = 1 A
• X = -2, y = 1 B
• X = 2, y = -1 C
• X = 2, y = 2 D

Every natural number is

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

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

If a and b are real numbers then a+b is also real number this law is called

• associative law of addition A
• closure law of addition B
• Distributive law of addition C
• Commutative law of addition D

• Closure law of addition A
• Associative law of addition B
• Additive inverse C
• Additive identity D

In R, the multiplicative inverse of a is

• 0 A
• 1 B
• -a C
• 1/a D

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

The conjugate of √5 i is

• √5 A
• -√5 i B
• i C
• 5i D

π is ______

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

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

• √3 i A
• √7 B
• -2-i C
• √5 D

202.04 is an example of

• Recurring decimals A
• Non-recurring decimals B
• Terminating decimals C
• None of above D

i³=

• -1 A
• i B
• -i C
• 1 D

A non-terminating, non-recurring decimal represent

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

• A rational number A
• A irrational number B
• An even integer C
• A factor of 36 D

Name the property used in 1000 x 1 = 1000

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

Every real number is

• a positive integer A
• a rational number B
• a negative integer C
• a complex number D

• 15 A
• 15 i B
• -15 i C
• -15 D

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

i² = 

• 1 A
• 2 B
• -1 C
• 0 D