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

For any real numbers x,y,xy=o ⇒

• x ≠ 0 ∧ y ≠ 0 A
• x = 0 ∨ y = 0 B
• x = 0 C
• y = 0 D

The multiplicative inverse of 4 is

• -4 A
• -1/4 B
• 1/4 C
• 1 D

The conjugate of √5 i is

• √5 A
• -√5 i B
• i C
• 5i D

The additive inverse of 1 is

• 1 A
• -1 B
• 0 C
• Does not exist D

The set of natural no. is closed under

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

Which of the following has the same value as i¹¹³?

• i A
• -1 B
• -i C
• 1 D

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

Zero is

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

The multiplicative inverse ofx^(-1) is

• x A
• a-2 B
• 0 C
• 1 D

What is the conjugate of -7 -2i?

• -7 + 2i A
• 7 + 2i B
• 7 -2i C
• None of these D

In (x +iy) y is called as

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

In R, the additive identity is

• 0 A
• 1 B
• -1 C
• None D

Every prime number is also

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

The multiplicative inverse of (a,b) is

• 
  A
• 
  B
• 
  C
• 
  D

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

• x A
• 
  B
• y C
• 
  D

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

• One A
• Two B
• Three C
• Four D

The set of rational number is represented by

• W A
• R B
• Q' C
• Q
  
  
  D

What is the conjugate of -6 -i?

• -6 +i A
• 6+i B
• -6 -i C
• 6 -i D

If 0 = R, thenthe additive inverse of a is

• 1/9 A
• ^1/-9 B
• a C
• -a D

24 can be written as a product of

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

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

The additive identity of real number is

• 1 A
• 2 B
• 1/2 C
• 0 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

i^-(4n+2) = -------------------------------

• 1 A
• i B
• -1 C
• -i D

The equation |x +4| = x has solution

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

a >b ⇒a +c >b +c is known as

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