ICSE Board Practice

ICSE Grade X - Proportion
Question 1
1.
    • If
    •  
    • a

      b
      =
      c

      d
    • ,
    • then which of the following is true ?
  • 4
    a
      +  
    3
    b

    4
    a
       
    3
    b
    =
    4
    c
      +  
    3
    d

    4
    c
       
    3
    d
  • 4
    a
      +  
    3
    d

    4
    a
       
    3
    d
    =
    3
    b
      +  
    4
    c

    3
    b
       
    4
    c
  • 4
    a
      +  
    2
    b

    4
    a
       
    2
    d
    =
    4
    c
      +  
    3
    d

    4
    c
       
    2
    d
  • 4
    a
       
    2
    b

    4
    a
       
    2
    d
    =
    4
    c
       
    3
    d

    4
    c
       
    2
    d
Question 2
2.
    • If
    • 'b'
    • is the mean proportional between
    • 'a'
    • and
    • 'c'
    • ,
    • then the mean proportional between
    •  
    • (
    • a
      2
    • +
    • b
      2
    • )
    • and
    • (
    • b
      2
    • +
    • c
      2
    • ) is
  • c (a + b)
  • ab + bc + ca
  • a (b + c)
  • b (a + c)
Question 3
3.
    • What
    • must be subtracted from
    • 26
    • ,
    • 46
    • ,
    • 18
    • ,
    • 30
    • so that the resulting numbers
    • are in proportion ?
  • 6
  • 4
  • 5
  • 7
  • 9
Question 4
4.
    • Componendo and Dividendo
    • of
    • w
      :
      p
      ::
      q
      :
      d
  • p
    :
    w
    ::
    d
    :
    q
  • w
    :
    q
    ::
    p
    :
    d
  • w
      +  
    p
    :
    p
    ::
    q
      +  
    d
    :
    d
  • w
      +  
    p
    :
    w
       
    p
    ::
    q
      +  
    d
    :
    q
       
    d
  • w
       
    p
    :
    p
    ::
    q
       
    d
    :
    d
Question 5
5.
    • If
    • a
      :
      b
      ::
      c
      :
      d
    • ,
    • then
  • ac = bd
  • ad = bc
  • ab = cd
  • abc = bcd
Question 6
6.
If
a,b,c,d,e,f
are in continued proportion, then which of the following is true?
  • a

    b
    =
    c

    d
    =
    e

    f
  • a
    b

    b
    c
    =
    b
    c

    c
    d
    =
    c
    d

    d
    e
  • a

    b
    =
    b

    c
    =
    c

    d
      • ab
      • =
      • bc
      • =
      • cd
      • =
      • de
Question 7
7.
    • Find the product of extremes of
    • 12
      :
      20
    • and
    • 2
      :
      5
  • 58
  • 40
  • 60
  • 59
  • 62
Question 8
8.
    • Find the mean proportional between
    • 1.5
    • and
    • 6
  • 3
  • 2
  • 1
  • 4
  • 5
Question 9
9.
    • Invertendo
    • of
    • x
      :
      h
      ::
      m
      :
      c
  • x
       
    h
    :
    h
    ::
    m
       
    c
    :
    c
  • x
      +  
    h
    :
    h
    ::
    m
      +  
    c
    :
    c
  • x
    :
    m
    ::
    h
    :
    c
  • h
    :
    x
    ::
    c
    :
    m
  • x
      +  
    h
    :
    x
       
    h
    ::
    m
      +  
    c
    :
    m
       
    c
Question 10
10.
Which of the following does not represent a proportion ?
  • 14
    :
    12
    ::
    42
    :
    36
  • 24
    :
    21
    ::
    48
    :
    42
  • 6
    :
    5
    ::
    12
    :
    15
  • 15
    :
    12
    ::
    60
    :
    48
  • 16
    :
    12
    ::
    80
    :
    60