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MCQ More than 1 choice

Fri, 12 Mar 2010 02:34:07 +0530

1. ∫1/sin²x+cos²xdx =
a) -2cot2x+c b) tanx-cotx+c c) 9+(sec²x)/2 d) 3-tan²x/2 e) (3-sec²x)/2 f) (tan²x/2)-5

2. If vectors a+b=vector c then vector a x b =
a) c x a b) a x c c) b x c d) c x b

3. If the direction ratio of a line are 1 + λ, 1 – λ, 2 and it makes an angle of 60° with the y-axis then λ is.
(a) 1– √3 (b) 2 – √5 (c) 1+ √3 (d) 2 + √5

nice and easy

Fri, 12 Mar 2010 01:22:12 +0530

for practice

Try this.... Its interesting!!!

Fri, 12 Mar 2010 01:19:51 +0530

5 men a1,a2,a3,a4,a5 are wearing caps of white or black colour without knowing the colour of his own cap.It is known that man wearing a black cap always speaks the truth and the one wearing white always tells lie.If the make following statements:
a1:I see 3 black caps and 1 white
a2:I see 4 white caps
a3:I see 1 black cap and 3 white cap
a4:I see 4 black caps
Conclude the colour of the cap worn by each..

Please try it.......

Cbse doubts

Fri, 12 Mar 2010 00:54:18 +0530

Give structure of H₄P₂O₅.
How to distinguish between Aniline and N-methylaniline?

Objective 1

Fri, 12 Mar 2010 00:46:56 +0530

1. If y= cosec x (cot^–1x) thendy/dx
a. x/√1-x² b) -x/√1+x²
c) x/√1+x² d) None

2. The maximum value of (1/x)^x is
a) e^1/e b) (1/e)^1/e c) e d) e^e

3. The value of c of Rolle's theorem for the function f(x) = x2 – 1 is interval [–1, 1] is
a) 1/4 b) 1/2 c) 0 d) None

4. ∫(1-cos x)/(1+cos x) dx =
a) x +(2tanx)/2 b) x-2tan(x/2) c) x+2tan(x/2 d) None

5. If A and B are such events that P(A) > 0 and P(B) ≠ 1 then P( A/B ) is equal to
a) 1– P(A∪B)/P(B) b) P(A)/P(B) c)1-P(A)/P(B) d)1-P(B/A)

Sum of series.............hav a taste of this...

Fri, 12 Mar 2010 00:12:29 +0530

I remember Nishant Bhaiya's face when he was discussing this problem....well he hates this type of abstract problems but i love this one....

find the value of:

well i warn sum of H.P. has no formula.....ise karne ka sirf gadha ghora hi gadha ghora tarika hai...:):P

easy

Fri, 12 Mar 2010 00:03:10 +0530

no. of distinct real roots of f"(x) if f(x)=(x-1)²⁵(x-2)⁴³(x-3)¹¹

Stereochemistry 1

Fri, 12 Mar 2010 00:01:30 +0530

Ques 1) Among the following, the optically inactive compound is

Ques 2) The binapthol (Bnp) is

(a) an optically active compound having chiral centre
(b)an optically inactive compound
(c) a meso compound (
d)an optically active compound without having vhiral centre

Ques 3) Which pairs of salts would have identical solubilities in methanol ?

Ques 4) Which of the following equilibria has the lowest dG° ??

Pitot Tube.....

Thu, 11 Mar 2010 23:15:28 +0530

DOUBTS!!!

Thu, 11 Mar 2010 23:10:09 +0530

1. what type of waves are used in:
a)photography in fog
b)detecting crystal structure
2.A solution of Na in liquid ammonia at -33°C conducts electricity.
On cooling the conductivity of this _______.
3.what are the reactions for extraction of metallic Ag from Argentite?
4.Multiple options correct:
Among these which species dont contain peroxide ions?
a)PbO₂ b)H₂O₂ c)SrO₂ d)BaO₂
reply soon.will post more.

stereo DOUBT

Thu, 11 Mar 2010 22:54:48 +0530

which one stable

Thu, 11 Mar 2010 22:47:52 +0530

org dbt ...aromatiicty..

Thu, 11 Mar 2010 22:43:15 +0530

BT-STS Recommend???

Thu, 11 Mar 2010 22:38:51 +0530

Which one of the BT STS papers among 3-7 would you recommend? i must learn something new...

ENTROPY

Thu, 11 Mar 2010 22:29:48 +0530

1...WHY IN CASE OF NO and CO TYPE OF MOLECULES ENTROPY IS NOT ZERO AT OK?

products

Thu, 11 Mar 2010 22:29:13 +0530

what are procucts of reductive ozonlysis of
a)acetylene
b)1,3 butadiene

acid strength...................................................................................................

Thu, 11 Mar 2010 22:24:14 +0530

acid strength :H₃PO₄,H₃PO₃,H₃PO₂ ...give the order

CBSE Angrezi ppr 2010

Thu, 11 Mar 2010 22:20:49 +0530

I was surprised....noone started a thread, don't neglect English (It is the % maker) :P

Anyways....Kaisa tha ? [173]

Also,,, How is my New Shirt....? :D

Onjective II

Thu, 11 Mar 2010 22:18:08 +0530

1. Let f : N → N be defined by f(x) = 2x + 3 ∀ x ∈ N then 'f ' is
(a) one-one onto (b) into (c) onto (d) None

2. Let f : R → R is defined as f(x) = 2x³ – 1. Then f^–1 is
(a) (1 – 2x)³ B) [(1+x)/2]^1/3 c) 2x³ + 1 d)(2x)³ + 1

3. The binary operation * on Z is defined as a * b = a + b + 1 ∀ a, b ∈ z, then the identity element in Z is
(a) 1 (b) 0 (c) –1 (d) None

4. If f : R → R be a function defined as f(x)= {1;x is irrational and -1; x is rational Then f(π) is equal to
a) 1 b) can't b found c) 0 d) -1

how to integrate ?

Thu, 11 Mar 2010 22:08:32 +0530

please help. ans nahin pata mujhe...
full soln. hi likhiyo.

aur haan dekhene walon sirf dekho maat try karo aur post the soln.