Maths Practice Question and Answer

Q:

If  $$ \ {xy\over x+y}= a, $$ $${xz\over x+z}=b $$ and $$ {yz\over y+z} =c $$  where a, b, c are all non – zero numbers, then x equals to

17 0

  • 1
    $$ 2abc\over {ab+bc-ac} $$
    Correct
    Incorrect
  • 2
    $$ 2abc\over {ab+ac-ac} $$
    Correct
    Incorrect
  • 3
    $$ 2abc\over {ac+bc-ab} $$
    Correct
    Incorrect
  • 4
    $$ 2abc\over {ac+bc-ac} $$
    Correct
    Incorrect
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Answer : 3. "$$ 2abc\over {ac+bc-ab} $$"

Q:

What angle is made by minute hand in 29 sec? 

26 0

  • 1
    1740°
    Correct
    Incorrect
  • 2
    2.9°
    Correct
    Incorrect
  • 3
    29°
    Correct
    Incorrect
  • 4
    260°
    Correct
    Incorrect
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Answer : 2. "2.9° "

Q:

The difference between the interior and exterior angles at a vertex of a regular polygon is 150°. The number of sides of the polygon is

13 0

  • 1
    10
    Correct
    Incorrect
  • 2
    15
    Correct
    Incorrect
  • 3
    24
    Correct
    Incorrect
  • 4
    30
    Correct
    Incorrect
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Answer : 3. "24 "

Q:

A can do a certain work in the same time in which B and C together can do it. If A and B together could do it in 10 days and C alone in 50 days, then B alone could do the work in

16 0

  • 1
    15 days
    Correct
    Incorrect
  • 2
    20 days
    Correct
    Incorrect
  • 3
    25 days
    Correct
    Incorrect
  • 4
    30 days
    Correct
    Incorrect
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Answer : 3. "25 days "

Q:

Divide Rs. 7,500 among A, B and C such that A’s share to B’s share is in the ratio 5:2 and B’s share to C’s share is in the ratio 7 : 13. How much will B receive ?

18 0

  • 1
    ₹ 1,400
    Correct
    Incorrect
  • 2
    ₹ 3,500
    Correct
    Incorrect
  • 3
    ₹ 2,600
    Correct
    Incorrect
  • 4
    ₹ 7,000
    Correct
    Incorrect
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Answer : 1. "₹ 1,400"

Q:

In the given figure , DE‖BC and AD:DB=5:3, then what is the value of DE|BC?

11 0

  • 1
    $${5\over8} $$
    Correct
    Incorrect
  • 2
    $${2\over3} $$
    Correct
    Incorrect
  • 3
    $${3\over4} $$
    Correct
    Incorrect
  • 4
    $${5\over3} $$
    Correct
    Incorrect
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Answer : 1. "$${5\over8} $$"

Q:

If a=x+y, b=x-y, c=x+2y, then $$ {a^2+b^2+c^2}-ab-bc-ca $$ is

6 0

  • 1
    $${4y^2}$$
    Correct
    Incorrect
  • 2
    $${5y^2}$$
    Correct
    Incorrect
  • 3
    $${6y^2}$$
    Correct
    Incorrect
  • 4
    $${7y^2}$$
    Correct
    Incorrect
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Answer : 4. "$${7y^2}$$"

Q:

The value of $$(x^{b+c})^{b-c}. (x^{c+a})^{c-a}.(x^{a+b})^{a-b}$$ when (x≠0).

8 0

  • 1
    1
    Correct
    Incorrect
  • 2
    2
    Correct
    Incorrect
  • 3
    -1
    Correct
    Incorrect
  • 4
    0
    Correct
    Incorrect
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Answer : 1. "1"

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