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Recent questions and answers in 1998

Questions >> JEEMAIN and NEET >> JEEMAIN PAST PAPERS >> 1998

A mixture contains four solid organic compounds A, B, C, D. On heating only C changes from solid to vapours state. C can be separated from the rest in the mixture by :

answered Nov 9, 2020 by amrutaraghushe007

1 answer

A simple pendulum hanging freely and at rest is vertical because in that position :

answered Sep 19, 2020 by hiteshrajput2201

1 answer

If $a, h, b$ are in A.P., then the triangular area formed by the pair of lines $ax^2 + 2hxy + by^2=0$ and the line $x-y=-2$ (in square units) is :

answered Jul 20, 2020 by sarmagoruganthu

1 answer

The equation of the directrix to the parabola $y^2 -2x - 6y -5 = 0$ is

answered May 23, 2020 by shinuanudeep

1 answer

Among the following compounds which have more than one type of hybridization for carbon atom :<br> 1. $CH_3.CH_2.CH_2.CH_3$ <br> 2.$CH_3.CH= CH.CH_3$ <br>3. $CH_2 = CH - CH = CH_2$ <br> 4.$H-C = C-H $

answered May 2, 2020 by erumaddisathvik

1 answer

If $\overrightarrow{\alpha}$ and $\overrightarrow{\beta}$ are non zero and different vector such that $|\overrightarrow{\alpha} + \overrightarrow{\beta}| = |\overrightarrow{\beta} - \overrightarrow{\alpha}|$, then the angle between $\overrightarrow{\alpha} $ and $\overrightarrow{\beta}$ is :

answered Jan 12, 2020 by pranavindurkar111

1 answer

By which of the following reactions can one get N-methyl aniline from aniline ?

answered Nov 13, 2019 by ushradha2000

1 answer

$\begin{align} \int_0^{\pi/2} \sin^6 x \cos^5 x \; dx \end{align}$ is equal to :

answered Sep 26, 2019 by baskar.chakrapani

1 answer

If at any point on the curve $y=f(x)$ the length of the subnormal is constant, then the curve will be a / an :

answered Aug 3, 2019 by stony3184

1 answer

A compound microscope has an objective of focal length 4 mm and an eye piece of focal length 25 mm. The objective produces a real image at a distance of 180 mm. If the eye piece is in normal adjustment the magnification is :

answered Jul 21, 2019 by bandaru9097

1 answer

A current carrying wire produces in the neighbourhood :

answered Jul 7, 2019 by srinivasasrini155

1 answer

$\frac{d}{dx} (x^x)$ is equal to :

answered Jun 19, 2019 by meghnathsahani277

1 answer

A real gas can be approximated to an ideal gas at :

answered May 21, 2019 by bijitadutta9

1 answer

When an alkyl halide reacts with an alkoxide the product is:

answered Feb 19, 2019 by nimalanrk

1 answer

The area bounded by $y = 3x$ and $y =x^2$ is (in sq unit) :

answered Feb 1, 2019 by honey06032002

1 answer

$\begin{align} \int_0^a \sqrt{a^2 - x^2} dx \end{align}$ is equal to :

answered Feb 1, 2019 by honey06032002

1 answer

Two dice are thrown at a time and the sum of the numbers on them is 6. The probability of getting the number 4 on any of the dice, is :

answered Feb 1, 2019 by honey06032002

1 answer

A coin tossed 3 times. The probability of getting head once and tails two times, is :

answered Feb 1, 2019 by honey06032002

1 answer

If $\overrightarrow{A}, \overrightarrow{B}, \overrightarrow{C}$ are three vectors such that $|\overrightarrow{A} | = 4, \; |\overrightarrow{B}| = 5,\; |\overrightarrow{C}|=6$, then $[\overrightarrow{A} - \overrightarrow{B} \; \; \overrightarrow{B} - \overrightarrow{C} \; \; \overrightarrow{C} - \overrightarrow{A} ] $ is equal to :

answered Feb 1, 2019 by honey06032002

1 answer

If the vectors $\overrightarrow{a} = ( 1, x, -2)$ and $\overrightarrow{b} = (x, 3, -4)$ are mutually perpendicular, then is :

answered Feb 1, 2019 by honey06032002

1 answer

If $\overrightarrow{a}, \overrightarrow{b}, \overrightarrow{c}$ are unit vectors such that $\overrightarrow{a} + \overrightarrow{b} + \overrightarrow{c} = 0$. Then $\overrightarrow{a}. \overrightarrow{b} + \overrightarrow{b}. \overrightarrow{c} + \overrightarrow{c} . \overrightarrow{a}$ is equal to :

answered Feb 1, 2019 by honey06032002

1 answer

If $|\overrightarrow{a}| = 5, |\overrightarrow{b} |= 6, |\overrightarrow{a}. \overrightarrow{b} | = 24$ then $|\overrightarrow{a} \times \overrightarrow{b} |$ is equal to :

answered Feb 1, 2019 by honey06032002

1 answer

10.6 g of a substance of molecular weight 106 was dissolved in 100 mL. 10 mL of this solution was pipetted out into a 1000 mL flask and made up to the mark with distilled water. The molarity of the resulting solution is :

asked Dec 20, 2018 by pady_1

0 answers

The angle between the planes <br> $\overrightarrow{r} ( 2 \hat{i} - \hat{j} + 2 \hat{k}) = 3$ and <br> $\overrightarrow{r}(3 \hat{i} - 6 \hat{j} + 2 \hat{k} )= 4$ is :

asked Dec 19, 2018 by pady_1

0 answers

If $\overrightarrow{A} = \hat{i} + \lambda \hat{j} + \hat{k}, \; \overrightarrow{B} = \hat{i} + \hat{j} + \hat{k}$, then for $|\overrightarrow{A} + \overrightarrow{B}| = |\overrightarrow{A} | + |\overrightarrow{B}|$ to be true, the value of $\lambda$ is equal to :

asked Dec 19, 2018 by pady_1

0 answers

If $2\hat{i} + 3 \hat{j} - 6\hat{k}, \; 6\hat{i} - 2\hat{j} + 3 \hat{k}, \; 3 \hat{i} - 6 \hat{j} - 2 \hat{k}$ represent the sides of a triangle, then the perimeter of the triangle is:

asked Dec 19, 2018 by pady_1

0 answers

The three points whose position vectors are $\hat{i} +2 \hat{j} +3\hat{k}, \; 3 \hat{i} + 4 \hat{j} +7 \hat{k}$ and $- 3 \hat{i} - 2 \hat{j} - 5 \hat{k}$ :

asked Dec 19, 2018 by pady_1

0 answers

The probability of a man hitting a target is $\frac{1}{4}$. If he fires 7 times, the probability of hitting the target at least twice is :

asked Dec 19, 2018 by pady_1

0 answers

A random variable $X$ has the following distribution <br> <br> the mean and the variance are :

asked Dec 19, 2018 by pady_1

0 answers

A random variable $X$ has the following distribution <br> <br> the values of $k$ and $P(X < 3)$ are equal to :

asked Dec 19, 2018 by pady_1

0 answers

A problem in EAMCET examination is given to 3 students A, B and C whose chance of solving it are $\frac{1}{2}, \frac{1}{3}$ and $\frac{1}{4}$ respectively, the probability that the problem is solved, is :

asked Dec 19, 2018 by pady_1

0 answers

A and B are mutually exclusive events with $P(A) = \frac{1}{2} P(B)$ and $A \cup B = S$ the sample space, then $P(A)$ is equal to :

asked Dec 19, 2018 by pady_1

0 answers

The equation $r = 5 \cos \theta + 12 \sin \theta$ represents :

asked Dec 19, 2018 by pady_1

0 answers

$\begin{align} \int \frac{e^x (1+x \log x)}{x}\;dx \end{align}$ is equal to :

asked Dec 19, 2018 by pady_1

0 answers

$\begin{align} \int \frac{x^5}{x^2 + 1} \;dx \end{align}$ is equal to :

asked Dec 19, 2018 by pady_1

0 answers

The value of $(127)^{1/3}$ upto 4 decimal places, is :

asked Dec 19, 2018 by pady_1

0 answers

The point on the curve $y^2 = 4x$ which is the nearest to the point $(2, 1)$ is :

asked Dec 19, 2018 by pady_1

0 answers

The maximum value of $fx) = 2x^3 - 21x^2 + 36 x + 20$, in the interval $0 \leq x \leq 2$, is

asked Dec 19, 2018 by pady_1

0 answers

The solution of the differential equation $\frac{dy}{dx} - \frac{2xy}{1+x^2}=0$ is :

asked Dec 19, 2018 by pady_1

0 answers

$y = x^2 \sin 2x$, then $n^{th}$ derivative of $y ( n = 4m)$ is :

asked Dec 19, 2018 by pady_1

0 answers

Derivative of $\sin^2x$ with respect to $(\log x)^2$ is:

asked Dec 19, 2018 by pady_1

0 answers

$\frac{d}{dx} (\cos x*)$ is equal to :

asked Dec 19, 2018 by pady_1

0 answers

If $f(x) = \frac{\sin x }{x}, \; x \neq 0$, if $f(x)$ is to be continuous at $x=0$, then $f(0)$ is equal to :

asked Dec 19, 2018 by pady_1

0 answers

One of the focii of hyperbola is origin and the corresponding directrix is $3x + 4y + 1=0$. The eccentricity of the hyperbola is $\sqrt{5}$. The equation to the hyperbola is :

asked Dec 19, 2018 by pady_1

0 answers

The eccentricity of ellipse $9x^2 + 4y^2 = 36$ is :

asked Dec 19, 2018 by pady_1

0 answers

The pole of the line $2x + 3y- 4=0$ with respect to the parabola $y^2 = 4x$ is :

asked Dec 19, 2018 by pady_1

0 answers

The equation of the normal to the circle $x^2 + y^2 - 2x - 2y - 2 = 0$ at the point $(3,1)$ on it is :

asked Dec 19, 2018 by pady_1

0 answers

The length of the tangent from (6, 8) to the circle $x^2 + y^2 = 4$ is :

asked Dec 19, 2018 by pady_1

0 answers

If $(1,2), \; (4, 3)$ are the limiting points of a system of coaxial circles, then the radical axis of the system is :

asked Dec 19, 2018 by pady_1

0 answers

The radical axis of cirlces $x^2 + y^2 - 6x -4y - 44=0$ and $x^2 +y^2- 14 x - 5y-24=0$ is :

asked Dec 19, 2018 by pady_1

0 answers

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