T3 - Rational Numbers English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021

8th Standard

    Reg.No. :
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Maths

Time : 00:10:00 Hrs
Total Marks : 10

    Part A

    10 x 1 = 10
  1. What will be the ones digit in the squares of the following numbers?

    (a)

    36

    (b)

    252

    (c)

    543

  2. Study the given numbers and justify why each of them obviously cannot be a perfect square.

    (a)

    1000

    (b)

    34567

    (c)

    408

  3. \(\\ \sqrt { 48 } \) is approximately equal to

    (a)

    5

    (b)

    6

    (c)

    7

    (d)

    8

  4. \(\sqrt { 128 } -\sqrt { 98 } +\sqrt { 18 } =\) 

    (a)

    \(\sqrt { 2 } \)

    (b)

    \(\sqrt { 8 } \)

    (c)

    \(\sqrt { 48 } \)

    (d)

    \(\sqrt { 32 } \)

  5. \(\sqrt { 22+\sqrt { 7 } +\sqrt { 4 } } \) =

    (a)

    \(\sqrt { 25 } \)

    (b)

    \(\sqrt { 33 } \)

    (c)

    \(\sqrt { 31 } \)

    (d)

    \(\sqrt { 29 } \)

  6. The number of digits in the square root of 123454321 is

    (a)

    4

    (b)

    5

    (c)

    6

    (d)

    7

  7. By what number should (-4)-1 be multiplied so that the product becomes 10-1?

    (a)

    \(\cfrac { 2 }{ 3 } \)

    (b)

    \(\cfrac { -2 }{ 5 } \)

    (c)

    \(\cfrac { 5 }{ 2 } \)

    (d)

    \(\cfrac { -5 }{ 2 } \)

  8. 0.0000000002020 in scientific form is

    (a)

    2.02 \(\times\) 109

    (b)

    2.02 \(\times\) 10−9

    (c)

    2.02 \(\times\) 10−8

    (d)

    2.02 \(\times\) 10−10

  9. (-2)-3 x (- 2)-2 is

    (a)

    \(\cfrac { -1 }{ 32 } \)

    (b)

    \(\cfrac { 1 }{ 32 } \)

    (c)

    32

    (d)

    -32

  10. If \(\left( \cfrac { p }{ q } \right) ^{ 1-3x }=\left( \cfrac { q }{ p } \right) ^{ \frac { 1 }{ 2 } }\), then x is __________

    (a)

    4−1

    (b)

    3−1

    (c)

    2−1

    (d)

    1-1

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