Quiz Discussion

In an A.P., if d = -4, n = 7, an = 4, then a is

Course Name: Quantitative Aptitude

  • 1] 6
  • 2] 7
  • 3] 20
  • 4] 28
Solution
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# Quiz
1
Discuss

Which term of the A.P. 24, 21, 18, ............ is the first negative term?

  • 1] 8th
  • 2] 9th
  • 3] 10th
  • 4] 12th
Solution
2
Discuss

If the fifth term of a GP is 81 and first term is 16, what will be the 4th term of the GP?

  • 1] 36
  • 2] 18
  • 3] 54
  • 4] 24
  • 5] 27
Solution
3
Discuss

If the sum of n terms of an A.P. be 3n2 + n and its common difference is 6, then its first term is

  • 1] 2
  • 2] 3
  • 3] 1
  • 4] 4
Solution
4
Discuss

(1) + (1 + 1) + (1 + 1 + 1) + ....... + (1 + 1 + 1 + ...... n - 1 times) = ......

  • 1]

    \(\frac{{n\left( {n + 1} \right)}}{2}\)

  • 2]

    \(\frac{{n\left( {n - 1} \right)}}{2}\)

  • 3]

    \({n^2}\)

  • 4]

    n

Solution
5
Discuss

If four numbers in A.P. are such that their sum is 50 and the greatest number is 4 times the least, then the numbers are

  • 1] 5, 10, 15, 20
  • 2] 4, 10, 16, 22
  • 3] 3, 7, 11, 15
  • 4] None of these
Solution
6
Discuss

A square is drawn by joining the mid points of the sides of a given square in the same way and this process continues indefinitely. If a side of the first square is 4 cm, determine the sum of the areas all the square.

  • 1] 32 Cm2
  • 2] 16 Cm2
  • 3] 20 Cm2
  • 4] 64 Cm2
  • 5] None of these
Solution
7
Discuss

The sum of first five multiples of 3 is:

 

  • 1]

    90

  • 2]

    72

  • 3]

    55

  • 4]

    45

Solution
8
Discuss

A bacteria gives birth to two new bacteria in each second and the life span of each bacteria is 5 seconds. The process of the reproduction is continuous until the death of the bacteria. initially there is one newly born bacteria at time t = 0, the find the total number of live bacteria just after 10 seconds :

  • 1]

    \(\frac{{{3^{10}}}}{2}\)

  • 2]

    310 - 210

  • 3]

    243 × (35 -1)

  • 4]

    310 - 25

  • 5]

    None of these

Solution
9
Discuss

A piece of equipment cost a certain factory 6,00,000. If it depreciates in value, 15% the first year, 13.5% the next year, 12% the third year, and so on, what will be its value at the end of 10 years, all percentages applying to the original cost?

  • 1] Rs. 2,00,000
  • 2] Rs. 1,05,000
  • 3] Rs. 4,05,000
  • 4] Rs. 6,50,000
Solution
10
Discuss

Sum of n terms of the series \(\sqrt 2   +   \sqrt 8   +   \sqrt {18}   +   \sqrt {32}   +  \) ....... is

 

  • 1]

    \(\frac{{n\left( {n + 1} \right)}}{2}\)

  • 2]

    \(2n\left( {n + 1} \right)\)

  • 3]

    \(\frac{{n\left( {n + 1} \right)}}{{\sqrt 2 }}\)

  • 4]

    1

Solution
# Quiz