Recent questions tagged 49

The correct Boolean operation represented by the circuit diagram drawn is

asked Jul 8, 2019 by pady_1

1 answer

A hole is :

asked Dec 19, 2018 by pady_1

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The element that can be used as acceptor impurity to dope silicon is :

asked Dec 19, 2018 by pady_1

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A source producing sound of frequency $170 \; Hz$ is approaching a stationary observer with a velocity of $17\;ms^{-1}$. The apparent change in the wavelength of sound heard by the observer is : (speed of sound in air = $340\; ms^{-1}$)

asked Dec 19, 2018 by pady_1

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A tank with vertical walls is mounted so that its base is at a height $H$ above the horizontal ground. The tank is filled with wate to a depth $'h'$. A hole is punched in the side wall of the tank at a depth $'x'$ below the water surface. To have maximum range of the emerging stream, the value of $x$ is :

asked Dec 11, 2018 by pady_1

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A cylinder of height 20 m is completely filled with water. The velocity of efflux of water (in $ms^{-1}$) through a small hole on the side wall of the cylinder near its bottom, is :

asked Dec 11, 2018 by pady_1

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A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor :

asked Dec 11, 2018 by pady_1

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Let $g(x) = \cos x^2, \; f(x) = \sqrt{x}$ and $\alpha, \;\beta \;(\alpha < \beta)$ be the roots of the quadratic equation $18x^2-9 \pi x + x^2 = 0$. Then the area (in sq. units) bounded by the curve $y=(gof)(x) $ and the lines $x = \alpha,\; x = \beta$ and $y =0$, is

asked Dec 11, 2018 by pady_1

1 answer

A capacitance of $2 \mu F$ is required in an electrical circuit across a potential difference of $1.0\; kV$. A large number of $1 \mu F$ capacitors are available which can withstand a potential difference of not more than $300\; V$. The minimum number of capacitors required to achieve this is :

asked Dec 11, 2018 by pady_1

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Which one of the following complexes shows optical isomerism ? (en=ethylenediamine)

asked Dec 11, 2018 by pady_1

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The correct statement on the isomerism associated with the following complex ions, (a) $[Ni(H_2O)_5NH_3]^{2+},$ (b)$[ Ni(H_2O)_4 (NH_3)_2]^{2+} $ and (c)$[Ni(H_2O)_3 (NH_3)_3]^{2+} $ is :

asked Dec 11, 2018 by pady_1

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Let C be the circle with centre at $(1, 1)$ and $radius = 1$. If T is the circle centred at $(0, y)$, passing through origin and touching the circle C externally, then the radius of T is equal to

asked Dec 11, 2018 by pady_1

1 answer

Statement -I : The value of the integral $\begin{align} \int_{\pi/6}^{\pi/3} \frac{dx}{1+\sqrt{\tan x} } \end{align}$ is equal to $\frac{\pi}{6}$. Statement-II : $\begin{align} \int_a^b f(x) dx = \int_a^b f(a+b-x) dx \end{align}$

asked Dec 11, 2018 by pady_1

1 answer

Truth table for system of four NAND gates as shown in figure is

asked Dec 11, 2018 by pady_1

0 answers

The two circles $x^2+y^2=ax$ and $x^2+y^2 =c^2 (c>0)$ touch each other if

asked Dec 11, 2018 by pady_1

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Let there be a spherically symmetric charge distribution with charge density varying as $\rho(r) = \rho_{_0}(\frac{5}{4} - \frac{r}{R})$ upto $r = R$ and $\rho (r) = 0$ for $r > R$, where $r$ is the distance from the origin. The electric field at a distance $r (r < R) $ from the origin is given by

asked Dec 11, 2018 by pady_1

0 answers

Using MO theory predict which of the following species has the shortest bond length ?

asked Nov 29, 2018 by pady_1

0 answers

Bakelite is obtained from phenol by reacting with

asked Nov 29, 2018 by pady_1

0 answers

In gamma ray emission from a nucleus:

asked Nov 29, 2018 by pady_1

1 answer

An inductor $(L=100 mH)$, a resistor $(R = 100 \Omega )$ and a battery $(E = 100 V)$ are initially connected in series as shown in the figure. After a long time the battery is disconnected after short circuiting the points A and B. The current in the circuit 1 ms after the short circuit is :

asked Nov 13, 2018 by pady_1

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If the circles $x^2 + y^2 + 2ax + cy + a = 0 $ and $x^2 + y^2-3ax + dy - 1 = 0$ intersect in two distinct points $P$ and $Q$, then the line $5x+by-a = 0$ passes through $P$ and $Q$ for :

asked Nov 5, 2018 by pady_1

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In the circuit, the galvanometer $G$ shows zero deflection. If the batteries $A$ and $B$ have negligible internal resistance, the value of the resistor $R$ will be:

asked Nov 5, 2018 by pady_1

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If a circle passes through the point (a, b) and cuts the circle $x^2+y^2=4$ orthogonally, then the locus of its centre is

asked Nov 5, 2018 by pady_1

0 answers

Regarding cross-linked or network polymers, which of the following statements is incorrect ?

asked Aug 21, 2018 by pady_1

1 answer

Fruit and leaf drop at early stages can be prevented by the application of

asked Aug 21, 2018 by pady_1

1 answer

Which is the National Aquatic Animal of India ?

asked Aug 21, 2018 by pady_1

1 answer

Which one of the following animals has two separate circulatory pathways ?

asked Aug 21, 2018 by pady_1

1 answer

If a the length of the side of a cube, the distance between the body centered atom one corner atom in the cube will be -

asked Aug 20, 2018 by pady_1

1 answer

A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be ?

asked Aug 20, 2018 by pady_1

2 answers

C and Si both have same lattice structure, having 4 bonding electrons in each. However, C is insulator where as Si is intrinsic semiconductor. This is because.

asked Aug 20, 2018 by pady_1

1 answer

In forward biasing of the p-n junction :

asked Aug 16, 2018 by pady_1

1 answer

Consider the following two statements – (A) Kirchhoff's junction law follows from the conservation of charge (B) Kirchhoff's loop law follows from the conservation of energy Which of the following is correct ?

asked Jul 26, 2018 by pady_1

1 answer

The symbolic representation of four logic gates are given below : The logic symbols for OR, NOT and NAND gates are respectively :

asked Jul 26, 2018 by pady_1

1 answer

The ratio of the radii of gyration of a circular disc to that of a circular ring, each of same mass and radius around their respective axes is -

asked Jul 26, 2018 by pady_1

1 answer

In the following circuit, the output Y for all possible inputs A and B is expresed by the truth table :-

asked Jul 26, 2018 by pady_1

1 answer

The vectors $\overrightarrow{A}$ and $\overrightarrow{B}$ are such that $[\overrightarrow{A}+\overrightarrow{B}]=[\overrightarrow{A}-\overrightarrow{B}]$ .The angle between the two vectors is:-

asked Jul 25, 2018 by pady_1

1 answer

Two bodies have their moments of inertia I and 2I respectively about their axis of rotation. If their kinetic energies of rotation are equal, their angular momentum will be in the ratio -

asked Jul 24, 2018 by pady_1

1 answer

A galvanometer of 50 ohm resistance has 25 divisions. A current of $4\times 10^{-4}$ ampere gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 volts, it should be connected with a resistance of

asked Jul 24, 2018 by pady_1

1 answer

A nuclear reaction given by $_ZX^A \to _{Z + 1}Y^A + _{–1}e ^0 + \overline{v}$ represents

asked Jul 24, 2018 by pady_1

1 answer

A sample of radioactive element containing $4 \times10^{16}$ active nuclei. Half life of element is 10 days, then number of decayed nuclei after 30 days : -

asked Jul 23, 2018 by pady_1

2 answers

A 1 kg stationary bomb is exploded in three parts having mass 1 : 1 : 3 respectively. Parts having same mass move in perpendicular direction with velocity 30 $ms^{–1}$, then the velocity of bigger part will be

asked Jul 20, 2018 by pady_1

1 answer

A bubble in glass slab $(\mu = 1.5)$ when viewed from one side appears at 5 cm and 2 cm from other side, then thickness of slab is :

asked Jul 20, 2018 by pady_1

1 answer

A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then the electric field at Q is proportional to :

asked Jun 15, 2018 by pady_1

2 answers

Which of the following is different from others ?

asked Dec 31, 2015 by pady_1

0 answers

Of the students in Denelle's class, 5 like to drink soda. 5 students like to drink orange juice. 2 students like to drink both soda and orange juice. How many students like to drink soda or orange juice or both?

asked Dec 31, 2015 by pady_1

0 answers

A brick measures 15 cm in length, 8 cm in breadth and 5 cm in height. How many bricks will be used to make a wall of length 15 m, breadth 10 m and height 8 metres?

asked Dec 31, 2015 by pady_1

0 answers

${18 + (2 \large\frac{1}{2} + \large\frac{4}{5})}$ of $\large\frac{1}{1000}$

asked Dec 31, 2015 by pady_1

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The height of a rectangle is less than 10. If the width of the rectangle is increased by 2 and its height is decreased by 1, then its area is increased by 4.What can you say about the width of the original rectangle?

asked Dec 31, 2015 by pady_1

0 answers

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