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

1/3 is a decimal

• Recurring A
• Terminating B
• Non-terminating C
• None of the above D

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

If a set S contains n elements then P (S) has ........ number of elements

• 2ⁿ A
• 2ⁿ² B
• 2.n C
• n² 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

In R, the multiplicative inverse of a is

• 0 A
• 1 B
• -a C
• 1/a D

i³ =

• -1 A
• i B
• -i C
• 1 D

Name the property used in 4 x (5 x 8) = ( 4 x 5) x 8

• Associative property of addition A
• Associative property of multiplication B
• Additive identity C
• Multiplicative identity D

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

• One A
• Two B
• Three C
• Four D

• 15 A
• 15 i B
• -15 i C
• -15 D

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

The square roots of negative numbers is called

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

The multiplicative inverse of -3i is

• 3i A
• -3i B
• -1/3i C
• 1/3 i D

In R, the additive inverse of a is

• 0 A
• 1 B
• -a C
• 1/a D

• 
  A
• 
  B
• 
  C
• 
  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

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

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

Every prime number is also

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

• 1 A
• -1 B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  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

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

Every natural number is

• A prime number A
• An irrational number B
• An integer C
• An even number D

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

• √3 i A
• √7 B
• -2-i C
• √5 D

• 
  A
• 
  B
• 
  C
• 
  D

The set of positive integers, 0 and negative integers is known as the set of

• Natural numbers A
• Rational numbers B
• All integers C
• Irrational numbers D

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

The equation |x + 4| = x has solution

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

The solution set of the equation |3x + 2| = 5 is

• 
  A
• 
  B
• 
  C
• 
  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

i⁹ =

• i² A
• -1 B
• 1 C
• i D