STD 11 - 8. sequence and series - CBSE STD 11 Science Maths Questions

749

Questions

1

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5

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01

M.C.Q (1 Marks)

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Sample Questions

STD 11 - 8. sequence and series questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark

Maximum value of sum of arithmetic progression $50, 48, 46, 44 ........$ is :-

A
$325$
B
$648$
C
$652$
✓
$650$

Answer: D.

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Q 2M.C.Q (1 Marks)1 Mark

Consider a sequence whose sum of first $n$ -terms is given by $S_n = 4n^2 + 6n, n \in N$, then $T_{15}$ of this sequence is -

A
$118$
B
$120$
✓
$122$
D
$86$

Answer: C.

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Q 3M.C.Q (1 Marks)1 Mark

If $\alpha ,\;\beta ,\;\gamma $ are the geometric means between $ca,\;ab;\;ab,\;bc;\;bc,\;ca$ respectively where $a,\;b,\;c$ are in A.P., then ${\alpha ^2},\;{\beta ^2},\;{\gamma ^2}$ are in

✓
$A.P.$
B
$H.P.$
C
$G.P.$
D
None of the above

Answer: A.

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Q 4M.C.Q (1 Marks)1 Mark

Given that $n$ A.M.'s are inserted between two sets of numbers $a,\;2b$and $2a,\;b$, where $a,\;b \in R$. Suppose further that ${m^{th}}$ mean between these sets of numbers is same, then the ratio $a:b$ equals

A
$n - m + 1:m$
B
$n - m + 1:n$
C
$n:n - m + 1$
✓
$m:n - m + 1$

Answer: D.

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Q 5M.C.Q (1 Marks)1 Mark

$150$ workers were engaged to finish a piece of work in a certain number of days. $4$ workers dropped the second day, $4$ more workers dropped the third day and so on. It takes eight more days to finish the work now. The number of days in which the work was completed is

A
$15$
B
$20$
✓
$25$
D
$30$

Answer: C.

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