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

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

14 is not a

• Prime number A
• Whole number B
• Even number C
• Real number D

(7, 9) + (3, -5) =

• (4, 4) A
• (10, 4) B
• (9, -5) C
• (7, 3) D

The set of natural no. is closed under

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

24 can be written as a product of

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

• 1 A
• -1 B
• 
  C
• 
  D

• (x, y) A
• (kx, y) B
• (x, ky) C
• (kx, ky) D

a >b ⇒a +c >b +c is known as

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

Name the property used in 100 + 0 = 100

• Additive inverse A
• Multiplicative inverse B
• Additive identity C
• Multiplicative identity 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

∀ z ∈ C, multipliucative is

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

• Principle of equality of fractions A
• Rule for product of fractions B
• Golden rule for fractions C
• Rule for quotient of fractions D

• 
  A
• 
  B
• 
  C
• 
  D

The negative square root of 9 can be written as:

• -√9 A
• √9 B
• √18 C
• -√18 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

1.4142135... is ______

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

It is not possible to find the exact value of

• π A
• √9 B
• ∛27 C
• √1 D

√25 is a number

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

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

In R, the multiplicative identity is

• 0 A
• 1 B
• -1 C
• None D

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

The equation |x + 4| = x has solution

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

• Additive property of inequality A
• Commutative property B
• Additive inverse C
• Additive identity D

The multiplicative inverse of -3i is

• 3i A
• -3i B
• -1/3i C
• 1/3 i D

∀ a ε R ∃ o ε R such that a + v = 0 + a = a is property of

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

• 0 A
• 1 B
• -1 C
• None of these D

In R the right cancellation property w.r.t. addition is

• 
  A
• 
  B
• 
  C
• 
  D

Any recurring decimal represents a

• Irrational no A
• Integer B
• Rational no C
• None of these D

O is ______

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

In R, the additive identity is

• 0 A
• 1 B
• -1 C
• None D