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

Any whole number can be written as a product of factors which are

• Odd numbers A
• Prime number B
• Rational number C
• Even number D

If in a set of real no a is multiplicative identity then

• a,a = a² A
• a,a = 1 B
• a,a = 0 C
• None of these D

The set of rational number is represented by

• W A
• R B
• Q' C
• Q
  
  
  D

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

(a-1)-1 =

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

24 can be written as a product of

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

√23 is

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

i⁹ =

• i² A
• -1 B
• 1 C
• i D

• Reflexive property A
• Symmetric property B
• Transitive property C
• Additive property D

14 is not a

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

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

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

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

The square roots of negative numbers is called

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

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

i¹⁰¹ =

• i A
• i² B
• -i C
• -1 D

• 
  A
• 
  B
• 
  C
• 
  D

(a +bi) -c (c +di) =

• (a +b) = (c +d) A
• (a +c) + i(b +d) B
• (a -c) + (c -d)i C
• (a -c) +(b -d) i D

QUQ, =

• N A
• R B
• W C
• Z D

Total number of subsets that can be formed out of the set {a,b,c} is

• 1 A
• 4 B
• 8 C
• 12 D

(a, b) + (-a, -b) =

• (0,0) A
• (a, b) B
• (-a, -b) C
• (1, 1) D

∀a,b,c∈R and c>0,then

• a>b ⇒ ac < bc A
• a>b ⇒ ac > bc B
• a<b ⇒ ac > bc C
• None of these D

• 1 A
• -1 B
• 
  C
• 
  D

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

• 
  A
• 
  B
• 
  C
• 
  D

The multiplicative inverse of 1 is

• 1 A
• -1 B
• 0 C
• Does not exist D

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

A subset of set of complex number whose elements are of the form (a,0) is called

• Real number A
• Complex number B
• Rational number C
• Irrational number D

What is the conjugate of -6 -i?

• -6 +i A
• 6+i B
• -6 -i C
• 6 -i D

i =

• √1 A
• √2 B
• √-2 C
• √-1 D

• N A
• r B
• 2r C
• π D