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Recent questions and answers in 2001
Questions
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JEEMAIN and NEET
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JEEMAIN PAST PAPERS
>>
2001
......... process is used for the removal of hardness of water :
jeemain
chemistry
past papers
2001
53
answered
Mar 24, 2020
by
sangethamadhu82
1
answer
The events A and B have probabilities 0.25 and 0.50 respectively. The probability that both A and B occur simultaneously is 0.14, then the probability that neither A nor B occurs, is :
jeemain
math
past papers
2001
109
answered
Feb 4, 2020
by
smitha.ds
1
answer
In a nuclide, one a.m.u of mass is dissipated into energy to bind its nucleons. The energy equivalent of this mass is :
jeemain
chemistry
past papers
2001
83
answered
Dec 20, 2019
by
azharwahab950
1
answer
The energy of an electron present in Bohr's second orbit of hydrogen atom is :
jeemain
chemistry
past papers
2001
81
answered
Jul 15, 2019
by
sharmaaparna1
1
answer
Find the binomial probability distribution whose mean is 3 and variance is 2.
jeemain
math
past papers
2001
111
answered
Jul 15, 2019
by
ritishgulati2018
1
answer
The r.m.s velocity of $CO_2$ at a temperature $T$ (in kelvin) is $x\; cm\;sec^{-1}$. At what temperature (in kelvin), the r.m.s. velocity of nitrous oxide would be $4x\;cm\;sec^{-1}$ ? <br> (Atomic weights of $C, \; N$ and $O$ are respectively $12, \; 14$ and $16$) :
jeemain
chemistry
past papers
2001
91
answered
Jul 14, 2019
by
vsimmi196
1
answer
If the normal to the parabola $y^2 = 4x$ at $P(1,2)$ meets the parabola again in $Q$, then co-ordinates of $Q$ are :
jeemain
math
past papers
2001
131
answered
Jul 10, 2019
by
dattawakde7507
1
answer
A magnet of length $10\; cm$ and magnetic moment $1\; Am^2$ is placed along side AB of an equilateral triangle ABC. If the length of the side AB is $10\; cm$. The magnetic induction at the point 'C' is :<br> $(\mu_0 = 4 \pi \times 10^{-7} Hm^{-1})$
jeemain
physics
past papers
2001
8
answered
Jul 8, 2019
by
syedataj761
1
answer
Absolute alcohol (100% alcohol) is prepared by distilled rectified spirit over :
jeemain
chemistry
past papers
2001
74
answered
Jul 7, 2019
by
akbhavya67
1
answer
The equation $16x^2 + y^2 + 8xy - 74x -78 y +212 = 0$ represents :
jeemain
math
past papers
2001
134
answered
Mar 9, 2019
by
nsravni180
1
answer
In order to double the frequency of the fundamental note emitted by a stretched string, the length is reduced to $\frac{3}{4}^{th}$ of the original length and the tension is changed. The factor by which the tension is to be changed is :
jeemain
physics
past papers
2001
15
answered
Mar 5, 2019
by
sangeethav838
1
answer
A steel meter scale is to be ruled so hat millimeter intervals are accurate within about $5 \times 10^{-5}m$ at a certain temperature. The maximum temperature variation allowable during the ruling is: <br> (Coefficient of linear expansion of steel = $10 \times 10^{-6} K^{-1}$)
jeemain
physics
past papers
2001
50
answered
Feb 25, 2019
by
upkarsingh2580
1
answer
The shadow of a tower standing on a level ground is found to be 60 metres longer when the sun's altitude is $30^{\circ}$ than when it is $45^{\circ}$. The height of the tower is :
jeemain
math
past papers
2001
200
asked
Dec 11, 2018
by
pady_1
0
answers
In a triangle $ABC, \;a^2 \sin 2C + c^2 \sin 2A $ is equal to :
jeemain
math
past papers
2001
199
asked
Dec 11, 2018
by
pady_1
0
answers
In a triangle $ABC, \; \frac{a}{b^2-c^2} + \frac{c}{b^2-a^2} = 0$, then $B$ is equal to :
jeemain
math
past papers
2001
198
asked
Dec 11, 2018
by
pady_1
0
answers
In a triangle $ABC$, $\frac{\cos C + \cos A}{c+a} + \frac{\cos B}{b}$ is equal to :
jeemain
math
past papers
2001
197
asked
Dec 11, 2018
by
pady_1
0
answers
$\sin^{-1} \begin{pmatrix}\frac{x}{\sqrt{1-x^2}} \end{pmatrix}$ is equal to :
jeemain
math
past papers
2001
196
asked
Dec 11, 2018
by
pady_1
0
answers
$\sec^2 (\tan^{-1}2) + \mathrm{cosec^2} (\cot^{-1} 3)$ is equal to :
jeemain
math
past papers
2001
195
asked
Dec 11, 2018
by
pady_1
0
answers
The equation $\sqrt{3}\sin x +\cos x = 4$, has:
jeemain
math
past papers
2001
194
asked
Dec 11, 2018
by
pady_1
0
answers
If $ A, B, C, D$ are angles of a cyclic quadrilateral, then $\cos A + \cos B + \cos C + \cos D$ is equal to :
jeemain
math
past papers
2001
193
asked
Dec 11, 2018
by
pady_1
0
answers
$\cos^2 ( \frac{\pi}{6} + \theta) - \sin^2 (\frac{\pi}{6} - \theta)$ is equal to :
jeemain
math
past papers
2001
192
asked
Dec 11, 2018
by
pady_1
0
answers
If $\mathrm{cosec} \theta = \frac{p+q}{p-q}$, then $\cot (\frac{\pi}{4} + \frac{\theta}{2} ) $ is equal to :
jeemain
math
past papers
2001
191
asked
Dec 11, 2018
by
pady_1
0
answers
$\frac{\sin 5 \theta}{\sin \theta}$ is equal to :
jeemain
math
past papers
2001
190
asked
Dec 11, 2018
by
pady_1
0
answers
If $\theta = \frac{\pi}{6}$, then the $10^{th}$ term of $1 + (\cos \theta + i \sin \theta) +(\cos \theta + i \sin \theta)^2+(\cos \theta + i \sin \theta)^3 + ... $ is equal to :
jeemain
math
past papers
2001
189
asked
Dec 11, 2018
by
pady_1
0
answers
If $\begin{vmatrix} 1-i & i \\ 1+2i & -i \end{vmatrix} = x + iy$, then $x$ is equal to :
jeemain
math
past papers
2001
188
asked
Dec 11, 2018
by
pady_1
0
answers
If $a$ is a complex number and $b$ is a real number, then the equation $\overline{a} + a + b =0$ represents a:
jeemain
math
past papers
2001
187
asked
Dec 11, 2018
by
pady_1
0
answers
If $A = \begin{bmatrix}0 & 2 \\ 3 & - 4 \end{bmatrix}, \; hA = \begin{bmatrix} 0 & 3a \\ 2b & 24 \end{bmatrix}$, then the value of $h, \;a,\;b$ are respectively :
jeemain
math
past papers
2001
186
asked
Dec 11, 2018
by
pady_1
0
answers
A square matrix $[a_{ij}]$ in which $a_{ij} =0$ for $i \neq j$ and $a_{ij}=k$ (constant) for $i=j$ is called a:
jeemain
math
past papers
2001
185
asked
Dec 11, 2018
by
pady_1
0
answers
If $A = \begin{bmatrix} -2 & 2 \\ -3 & 2 \end{bmatrix}, \; B = \begin{bmatrix} 0 & -1 \\ 1 & 0 \end{bmatrix}$, then $(B^{-1}A^{-1})^{-1}$ is equal to :
jeemain
math
past papers
2001
184
asked
Dec 11, 2018
by
pady_1
0
answers
The bi-quadratic equation, two of whose roots are $1+i, \; 1-\sqrt{2}$, is :
jeemain
math
past papers
2001
183
asked
Dec 11, 2018
by
pady_1
0
answers
$\displaystyle\lim_{x \to 0} \frac{\sin x \sin^{-1} x}{x^2}$ is equal to :
jeemain
math
past papers
2001
182
asked
Dec 11, 2018
by
pady_1
0
answers
If $1$ is a multiple root of order 3 for the equation $x^4 - 2x^3 + 2x-1=0$, then the other root is :
jeemain
math
past papers
2001
181
asked
Dec 11, 2018
by
pady_1
0
answers
The roots of the equation $x^3 - 14 x^2 + 56x -64=0$ are in :
jeemain
math
past papers
2001
180
asked
Dec 11, 2018
by
pady_1
0
answers
Each of the roots of the equation $x^3 - 6x^2 + 6x-5 =0$ are increased by $h$. So that the new transformed equation does not contain $x^2$ term, then $h$ is equal to :
jeemain
math
past papers
2001
179
asked
Dec 11, 2018
by
pady_1
0
answers
$20^{2-3x^2} = (40\sqrt{5})^{3x^2-2}$, then $x$ is equal to :
jeemain
math
past papers
2001
178
asked
Dec 11, 2018
by
pady_1
0
answers
If $\alpha, \beta$ are the roots of the equation $x^2 + bx + c =0$ and $\alpha + h, \; \beta+h$ are the roots of the equation $x^2 + qx + r =0$, then $h$ is equal to :
jeemain
math
past papers
2001
177
asked
Dec 11, 2018
by
pady_1
0
answers
$|x| <1$, the coefficient of $x^3$ in the expansion of $\log (1+x+x^2)$ in ascending powers of $x$, is :
jeemain
math
past papers
2001
176
asked
Dec 11, 2018
by
pady_1
0
answers
$\frac{2}{2!} + \frac{2+4}{3!} + \frac{2+4+6}{4!}$ + ...$ is equal to:
jeemain
math
past papers
2001
175
asked
Dec 11, 2018
by
pady_1
0
answers
If $\frac{x-4}{x^2-5x-2k} = \frac{2}{x-2} - \frac{1}{x+k'}$ then $k$ is equal to :
jeemain
math
past papers
2001
174
asked
Dec 11, 2018
by
pady_1
0
answers
If $(1+x)^n = C_0 + C_1x + C_2x^2 + ....+ C_nx^n$, then $C_0+2C_1 + 3C_2 + ....+(n+1)C_n$ is equal to :
jeemain
math
past papers
2001
173
asked
Dec 11, 2018
by
pady_1
0
answers
The co-efficient of $x^4$ in the expansion of $\frac{(1-3x)^2}{(1-2x)}$ is equal to :
jeemain
math
past papers
2001
172
asked
Dec 11, 2018
by
pady_1
0
answers
$1+\frac{1}{4} + \frac{1.3}{4.8} + \frac{1.3.5}{4.8.12} + ...$ is equal to :
jeemain
math
past papers
2001
171
asked
Dec 11, 2018
by
pady_1
0
answers
Using the digits $0, 2, 4, 6, 8$ not more than once in any number, the number of 5 digited numbers that can be formed, is :
jeemain
math
past papers
2001
170
asked
Dec 11, 2018
by
pady_1
0
answers
The number of ways in which 5 boys and 4 girls sit around a circular tables. So that no two girls sit together is :
jeemain
math
past papers
2001
169
asked
Dec 11, 2018
by
pady_1
0
answers
If $y = A \cos nx + B \sin nx$, then $y_2 = n^2y$ is equal to :
jeemain
math
past papers
2001
168
asked
Dec 11, 2018
by
pady_1
0
answers
If $2^3 + 4^3 + 6^3 + ....+(2n)^3 = hn^2 (n+1)^2$, then $h$ is equal to :
jeemain
math
past papers
2001
167
asked
Dec 11, 2018
by
pady_1
0
answers
If $x =\log_{0.1} 0.001, \; y = \log_9 81 $, then $\sqrt{x -2\sqrt{y}}$ is equal to :
jeemain
math
past papers
2001
166
asked
Dec 11, 2018
by
pady_1
0
answers
$\frac{\sqrt{8 +\sqrt{28} } + \sqrt{8 - \sqrt{28}}}{\sqrt{8 +\sqrt{28} } - \sqrt{8 - \sqrt{28}}} $ is equal to :
jeemain
math
past papers
2001
165
asked
Dec 11, 2018
by
pady_1
0
answers
Two functions $f : R \to R, \; g: R \to R$ are defined as follows <br> $ f(x) = \begin{cases} 0 , & \quad \text{x } \text{ is rational}\\ 1, & \quad \text{x} \text{ is irrational} \end{cases}$ <br> $ g(x) = \begin{cases} -1 , & \quad \text{x } \text{ is rational}\\ 0, & \quad \text{x} \text{ is irrational} \end{cases}$ <br> Then $(fog) (\pi) + (gof)(e)$ is equal to :
jeemain
math
past papers
2001
164
asked
Dec 11, 2018
by
pady_1
0
answers
Let $f : R \to R$ is defined by <br> $ f(x) = \begin{cases} x+2, & x \leq -1 \\ x^2 , & -1 < x <1 \\ 2-x, & x \geq 1 \end{cases}$<br> Then the value of $f(-1.75) + f(0.5) + f(1.5)$ is :
jeemain
math
past papers
2001
163
asked
Dec 11, 2018
by
pady_1
0
answers
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