NCERT Solutions for class 13 Maths | Chapter 13 - Introduction to Limits and Derivatives

(1) Limx->∞ {(x + 6)/(x + 1)}(x + 4) equals
[A] e
[B] e3
[C] e5
[D] e6
Answer: e5
(2) Limx->0 (1 - cos x)/x is
[A] 0
[B] 1
[C] 1/2
[D] Limit does not exist
Answer: 0

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(3) Limx->0 sin (ax)/bx is
[A] 0
[B] 1
[C] a/b
[D] b/a
Answer: a/b
(4) Then value of Limx->0 {ex - (1 + x)}/x2 is
[A] 0
[B] 2
[C] 1/2
[D] e
Answer: 1/2
(5) The value of the limit Limn->∞ (1 + 1/n)n+5 is
[A] 0
[B] 1
[C] e
[D] 1/e
Answer: e
(6) The value of the limit Limx->0 {log(1 + ax)}/x is
[A] 0
[B] 1
[C] a
[D] 1/a
Answer: a
(7) The derivative of [1+(1/x)] /[1-(1/x)] is
[A] 1/(x-1)2
[B] -1/(x-1)2
[C] 2/(x-1)2
[D] -2/(x-1)2
Answer: -2/(x-1)2
(8) The value of limx->0 {(x3 * cotx)/(1-cosx)} is
[A] 0
[B] 1
[C] -1
[D] 2
Answer: 2
(9) The expansion of ex is
[A] ex = 1 - x/1! + x2 /2! - x3 /3! + x4 /4! - ..............
[B] ex = 1 + x/1! + x2 /2! + x3 /3! + x4 /4! + ..............
[C] ex = -1 - x/1! - x2 /2! - x3 /3! - x4 /4! - ..............
[D] None of these
Answer: ex = 1 + x/1! + x2 /2! + x3 /3! + x4 /4! + .............
(10) The derivative of x + 1/x is
[A] 1 + 1/x
[B] 1 - 1/x
[C] 1 - 1/x2
[D] 1 + 1/x2
Answer: 1 - 1/x2
(11) The value of limit Limx->0 {sin (a + x) - sin (a - x)}/x is
[A] 0
[B] 1
[C] 2 cos a
[D] 2 sin a
Answer: 2 cos a
(12) The expansion of log(1 - x) is
[A] x - x2 /2 + x3 /3 - ........
[B] x + x2 /2 + x3 /3 + ........
[C] -x + x2 /2 - x3 /3 + ........
[D] -x - x2 /2 - x3 /3 - ........
Answer: -x - x2 /2 - x3 /3 - ........
(13) Limx->0 {(ax - bx )/ x} is equal to
[A] log a
[B] log b
[C] log (a/b)
[D] log (a*b)
Answer: log (a/b)
(14) The value of Limx->∞ (sin x/x) is
[A] 0
[B] 1
[C] -1
[D] None of these
Answer: 0
(15) Limx->-1 [1 + x + x2 + ..........+ x10 ] is
[A] 0
[B] 1
[C] -1
[D] 2
Answer: 1
(16) The value of Limx->a (a*sin x - x*sin a)/(ax2 - xa2 ) is
[A] (a*cos a + sin a)/a2
[B] (a*cos a - sin a)/a2
[C] (a*cos a + sin a)/a
[D] (a*cos a - sin a)/a
Answer: (a*cos a - sin a)/a2
(17) The value of Limx->0 (sin ax/sin bx) is
[A] a+b
[B] a-b
[C] a*b
[D] a/b
Answer: a/b
(18) The value of Limx->0 (1 + x)n is equal to
[A] 0
[B] 1
[C] 1/2
[D] None of these
Answer: 1
(19) The value of the limit Limn->0 (1 + an)b/n is
[A] ea
[B] eb
[C] eab
[D] ea/b
Answer: eab
(20) The expansion of ax is
[A] ax = 1 + x/1! * (log a) + x2 /2! * (log a)2 + x3 /3! * (log a)3 + ...........
[B] ax = 1 - x/1! * (log a) + x2 /2! * (log a)2 - x3 /3! * (log a)3 + ...........
[C] ax = 1 + x/1 * (log a) + x2 /2 * (log a)2 + x3 /3 * (log a)3 + ...........
[D] ax = 1 - x/1 * (log a) + x2 /2 * (log a)2 - x3 /3 * (log a)3 + ...........
Answer: ax = 1 + x/1! * (log a) + x2 /2! * (log a)2 + x3 /3! * (log a)3 + ...........

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