ECAT Pre Engineering Mathematic MCQ Test With Answer for Chapter 1 (Number System)

√-1 b=

• b A
• 2 B
• 2b C
• None of these D

i¹⁰¹=

• i A
• i² B
• -i C
• -1 D

O is ______

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

The set of rational number is represented by

• W A
• R B
• Q' C
• Q
  
  
  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

(a,0) x (c, 0) =

• (0,ac) A
• (ac, 0) B
• (0,0) C
• (a, c) D

• Set of whole number A
• Rational Numbers B
• Complex numbers C
• Whole numbers D

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

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

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

• 
  A
• 
  B
• 
  C
• 
  D

In R the number of identity element w.r.t '+' is

• One A
• Two B
• Three C
• Four D

• 
  A
• 
  B
• 
  C
• 
  D

A non-terminating non_recurring decimal represents an

• Irrational no A
• Both a & c B
• Rational no C
• None of these 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

Multiplicative inverse of "1" is

• 0 A
• ±1 B
• 1 C
• {0,1} D

• Symmetric property A
• Cancellation property w.r.t. multiplication B
• Reflexive property C
• Transitive property D

• 1 A
• -i B
• i C
• 0 D

• 
  A
• 1 B
• -1 C
• 
  D

∀x,y∈ R and x < 0, y < 0, which one is true 

• xy < o A
• xy = o B
• xy > o C
• None of these D

i² = 

• 1 A
• 2 B
• -1 C
• 0 D

In (x + iy), y is called as

• Imaginary part A
• Complex number B
• Real part C
• None of above 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

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

In R, the multiplicative inverse of a is

• 0 A
• 1 B
• -a C
• 1/a D

Every irrational number is

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

• 
  A
• 
  B
• 
  C
• None of these D

3.5+5.4=5.4+3.5 =8.9 this property of addition is called

• additive identity A
• assoclative property B
• commulative property C
• closure property D

• 
  A
• 1 B
• 
  C
• -1 D

• 
  A
• 
  B
• 
  C
• 
  D