Maths Practice Question and Answer

Q:

If b is the mean proportionate of a and c then find the value of $$ {(a-b)^{3}:(b-c)^{3}}$$ ?

1330 0

  • 1
    $$ {a^{3}:b^{3}}$$
    Correct
    Wrong
  • 2
    $$ {a^{2}:b^{2}}$$
    Correct
    Wrong
  • 3
    $$ {b^{2}:c^{2}}$$
    Correct
    Wrong
  • 4
    $$ {a^{3}:c^{3}}$$
    Correct
    Wrong
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Answer : 1. "$$ {a^{3}:b^{3}}$$"

Q:

If $$ {y\over {x-3}}={y+x\over 3}={x\over y}$$ then 3 : y : x equal to :

1240 0

  • 1
    3 : 2 : 1
    Correct
    Wrong
  • 2
    4 : 2 : 3
    Correct
    Wrong
  • 3
    3 : 2 : 4
    Correct
    Wrong
  • 4
    3 : 4 : 2
    Correct
    Wrong
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Answer : 3. "3 : 2 : 4"

Q:

If a + b: b+c : c+a= 6:7:8 and a + b+c= 14, , then the value of c is : 

1341 0

  • 1
    6
    Correct
    Wrong
  • 2
    7
    Correct
    Wrong
  • 3
    8
    Correct
    Wrong
  • 4
    10
    Correct
    Wrong
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Answer : 1. "6 "

Q:

A spherical ball of lead 3 cm in diameter is melted and recast into three spherical balls The diameter of two of these are 1.5 cm and 2 cm respectively. The diameter of the third ball is 

1262 0

  • 1
    1.4 cm
    Correct
    Wrong
  • 2
    1.8 cm
    Correct
    Wrong
  • 3
    2.1 cm
    Correct
    Wrong
  • 4
    2.5 cm
    Correct
    Wrong
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Answer : 4. "2.5 cm"

Q:

An open box is made of wood 3 cm thick. Its external dimensions are 1.36 m, 1.06 m and 8.3 dm. The cost of painting the inner surface of the box at 50 paise per 100 sq. cm (in Rs.) is 

1554 0

  • 1
    232
    Correct
    Wrong
  • 2
    246
    Correct
    Wrong
  • 3
    249
    Correct
    Wrong
  • 4
    256
    Correct
    Wrong
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Answer : 3. "249 "

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