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RRB Group D Number System — practice questions — page 2

Explore 34 free Number System questions in RRB Group D Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.

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Number System questions and exercises with answers

Showing questions 31–34 of 34.

Which operation keeps rationals closed?Read the answer and worked solution →Spot the odd oneRead the answer and worked solution →Complete the density statementRead the answer and worked solution →Closure in practiceRead the answer and worked solution →

Worked practice questions

Which operation keeps rationals closed?

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Items
  1. Item
    Addition
    Category
    Closed
  2. Item
    Subtraction
    Category
    Closed
  3. Item
    Multiplication
    Category
    Closed
  4. Item
    Division by zero
    Category
    Not stated as closed
Categories
  1. Item
    Closed
  2. Item
    Not stated as closed
Three of the four operations are safe, as the chapter states. Source: syllabus Maths, Ch 1 Rational Numbers.

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Spot the odd one

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Questions
  1. Items
    1. Rational
    2. Closure
    3. Associativity
    Odd item
    Rational
  2. Items
    1. a + 0 = a
    2. a + 1 = a
    3. a × 1 = a
    Odd item
    a + 1 = a
  3. Items
    1. Additive identity
    2. Multiplicative identity
    3. Distributivity
    Odd item
    Distributivity
One item in each group is not a property. Source: syllabus Maths, Ch 1 Rational Numbers.

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Complete the density statement

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Missing parts
  1. Answer
    countless
    Choices
    1. countless
    2. exactly two
    3. no
  2. Answer
    mean
    Choices
    1. mean
    2. median
    3. mode
Complete the statement
Between any two given rational numbers there are {0} rational numbers, and the idea of the {1} helps us find them.
The last summary point, in one sentence. Source: syllabus Maths, Ch 1 Rational Numbers.

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Simple InterestRatio and ProportionTime and WorkProfit and LossSquare RootsProfit LossBasic ArithmeticMultiplication