Number System One Mark Questions

7th Standard

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Maths

Time : 01:00:00 Hrs
Total Marks : 20
    5 x 1 = 5
  1. The temperature at 12 noon at a certain place was 18° above zero. If it decreases at the rate of 3° per hour at what time it would be 12° below zero?

    (a)

    12 mid night

    (b)

    12 noon

    (c)

    10 am

    (d)

    10 pm

  2. (-5) - (-18) = ____

    (a)

    23

    (b)

    -13

    (c)

    13

    (d)

    -23

  3. Which of the following does not represent an Integer?

    (a)

    0 ÷ (-7)

    (b)

    20 ÷ (−4)

    (c)

    (-9) ÷ 3

    (d)

    (12) ÷ 5

  4. (−200) ÷ 10 is

    (a)

    20

    (b)

    -20

    (c)

    -190

    (d)

    210

  5. The set of integers is not closed under

    (a)

    Addition

    (b)

    Subtraction

    (c)

    Multiplication

    (d)

    Division

  6. 5 x 1 = 5
  7.  -(30) + ____ = 60

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    90

  8. -44 + ____  = -88

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    (-44)

  9. (100) \(\times \) ______= -500

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    -5

  10.  (−40) ÷____ = 40

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    -1

  11. (-52) + (-52) = ____

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    -104

  12. 5 x 1 = 5
  13. The additive inverse of (–32) is (–32)

    (a) True
    (b) False
  14. (-675) - (-400) = -1075

    (a) True
    (b) False
  15. 15 - (-18) is the same as 15 + 18

    (a) True
    (b) False
  16. (-45) - (-8) = (-8) - (-45)

    (a) True
    (b) False
  17. (-15) x 5 = 75

    (a) True
    (b) False
  18. 5 x 1 = 5
  19. For any two integers 72 and 108, 72 +108 is an also an integer

  20. (1)

    Distributive property of multiplication over addition

  21. For any three integers 68, 25 and 99
    68 x( 25 + 99) = ( 68 x 25 ) + ( 68 x 9)

  22. (2)

    Additive identity

  23. 0 + (−138) = (−138) = (−138)+0

  24. (3)

    Commutative property under multiplication.

  25. For any two integers (−5) and 10
    (−5) x 10 = 10 x (−5)

  26. (4)

    Closed under addition

  27. 1 x (-1098) = (–1098) = (–1098) x 1

  28. (5)

    Multiplicative identity

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