ECAT Pre Engineering MCQ Test With Answer for Chapter 1 Mathematics

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

• 
  A
• 
  B
• 
  C
• 
  D

Q∪ Q' =

• Q A
• Q' B
• N C
• R D

The equation |x + 4| = x has solution

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

The multiplicative inverse ofx^(-1) is

• x A
• a-2 B
• 0 C
• 1 D

i² =

• 1 A
• 2 B
• -1 C
• 0 D

(a-1)-1 =

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

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

• √3 i A
• √7 B
• -2-i C
• √5 D

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

• 
  A
• 1 B
• 
  C
• -1 D

The additive inverse of 1 is

• 1 A
• -1 B
• 0 C
• Does not exist D

Name the property used in 4.1 + (-4.1) = 0

• Additive inverse A
• Multiplication inverse B
• Additive identity C
• Multiplication identity 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

√-1 b=

• b A
• 2 B
• 2b C
• None of these D

Multiplicative inverse of "1" is

• 0 A
• ±1 B
• 1 C
• {0,1} D

• real part of z A
• imaginary part of z B
• conjugate of z C
• modulus of z D

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

For each real number, there is a number which is its

• Negative A
• Possitive B
• Opposite C
• Similar D

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

• 0 A
• 1 B
• -1 C
• None of these D

If P is a whole number greater than 1, which has only P and I are factors. Then P is called

• Wholw number A
• Prime number B
• Even number C
• Odd number D

14 is not a

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

The negative square root of 9 can be written as:

• -√9 A
• √9 B
• √18 C
• -√18 D

Name the property used in a (b-c) = ab - ac

• commutative property of multiplication A
• distributive property of multiplication B
• associative property of multiplication C
• multiplicative inverse D

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

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

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

4/√49 is a

• Irrational Number A
• Prime Number B
• Rational number C
• Whole number D

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

i =

• √1 A
• √2 B
• √-2 C
• √-1 D