ECAT Pre Engineering MCQ Test With Answer for Chapter 1 Mathematics

The negative square root of 9 can be written as:

• -√9 A
• √9 B
• √18 C
• -√18 D

6 is

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

Associative law of multiplication

• ab - ba A
• a(bc) = (ab) c B
• a(b + c) = ab +ac C
• (a +b)c = ac + bc D

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

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

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

• One A
• Two B
• Three C
• Four D

Name the property used in 1000 x 1 = 1000

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

(a^-1)^-1=

• a^-1 A
• a B
• -a C
• None of above D

What is the conjugate of -7 -2i ?

• -7 + 2i A
• 7 +2i B
• 7 -2i C
• √53 D

Which of the following sets has closure property w.r.t. addition

• { 0 } A
• { 1 } B
• { 0, -1} C
• { 1, -1} D

The symbol of irrational is

• W A
• N B
• Q C
• Q' D

• 15 A
• 15 i B
• -15 i C
• -15 D

3/2 is

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

• 
  A
• 
  B
• 
  C
• 
  D

∀x,y∈R and x> 0 , y>0, if x > y

• 
  A
• 
  B
• 
  C
• None of these D

If z₁ = (a,b), z₂=(c,d), then z₁ z₂ = -------------------

• (ac,bd) A
• (ac+bd, ad-bc) B
• (ac-bd , ad+bc) C
• (ac-bd , ad-bc) D

In (x +iy) y is called as

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

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

The square root of every incomplete square is an

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

• 0 A
• 1 B
• -1 C
• 2 D

• Additive property in R A
• Multiplication property in R B
• Cancellation property in R C
• Distribution property in R D

The square roots of negative numbers is called

• Real no A
• Complex no B
• Positive no C
• Negative no D

If 0 = R, thenthe additive inverse of a is

• 1/9 A
• ^1/-9 B
• a C
• -a D

Every prime number is also

• Rational number A
• Even number B
• Irrational number C
• Multiple of two numbers D

∀a,b, c ε R ac = bc ⇒ a = b, c ≠ 0 is a

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

I is not

• Real number A
• Natural number B
• Prime Number C
• Whole Number 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

The additive inverse of 2/3 is

• 3/2 A
• -2/3 B
• -3/2 C
• 0 D

Every real number is

• A complex number A
• A rational number B
• A natural number C
• A prime number D

√25 is a number

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

• real number A
• complex number B
• rational number C
• irrational number D