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

6 is

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

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

3/2 is

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

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

• 
  A
• 
  B
• 
  C
• 
  D

• 0 A
• 1 B
• -1 C
• 2 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

If z = (x,y) , then  z ̅  =

• (-x,y) A
• (x,-y) B
• (-x, -y) C
• None of these 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

• 
  A
• 
  B
• 
  C

If A = {x / x ∈ R ∧ x² - 16 = 0} then A =

• - x A
• Infinite set B
• Φ C
• {-4,4} D

O is ______

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

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

The multiplicative inverse of 1 - 2i is

• 
  A
• 
  B
• 
  C
• 
  D

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

∀ z ∈ C, multipliucative is

• (1,1) A
• (1,0) B
• (0,1) C
• None of these 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

Every real number is

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

In R, the additive inverse of a is

• 0 A
• 1 B
• -a C
• 1/a D

The identity element with respect to subtraction is

• 0 A
• 1 B
• -1 C
• Does not exist D

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

If 0 = R, thenthe additive inverse of a is

• 1/9 A
• ^1/-9 B
• a C
• -a D

202.04 is an example of

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

• 
  A
• 
  B
• 
  C
• 
  D

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

• 
  A
• 
  B
• 
  C
• 
  D

If P is a whole number greater than 1, which has only P and I are factors. Then P is called

• Wholw number A
• Prime number B
• Even number C
• Odd number D

The set of natural no. is closed under

• multiplication A
• subtraction B
• difference C
• division D

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

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

i² = 

• 1 A
• 2 B
• -1 C
• 0 D