Recent questions tagged 16

The compound that is most difficult to protonate is:-

asked Jul 10, 2019 by pady_1

1 answer

The equation of motion of a particle is given by $\frac{dp}{dt} + m \omega^2 n = 0$, where $p$ is the momentum and $n$ is the position. Then the particle :

asked Dec 19, 2018 by pady_1

0 answers

The moment of inertia of a thin uniform rod of mass $M$ and length $L$ about an axis perpendicular to the rod, through its center is $I$. The moment of inertia of the rod about axis perpendicular to the rod through its end point is :

asked Dec 19, 2018 by pady_1

0 answers

The energy of an X-ray photon of wavelength $1.65 \mathring{A}$ is : ($h = 6.6 \times 10^{-34} Js, \; c = 3 \times 10^8 ms^{-1}, \; 1eV = 1.6 \times 10^{-19}J$)

asked Dec 19, 2018 by pady_1

0 answers

The wavelength of maximum intensity of radiation emitted by a star is $289.8\;nm$. The radiation intensity of the star is : (Stefan's contant = $5.67 \times 10^{-8} \;Wm^2K^{-4}$, constant $b = 2898\; \mu m K$)

asked Dec 11, 2018 by pady_1

0 answers

Energy required to move a body of mass $m$ from an orbit of radius $2R$ and $3R$ is :

asked Dec 11, 2018 by pady_1

0 answers

A particle performing uniform circular motion has angular momentum L. If its angular frequency is doubled and its kinetic energy halved, then the new angular momentum is :

asked Dec 11, 2018 by pady_1

0 answers

Seven identical circular planar disks, each of mass M and radius R are welded symmetrically as shown. The moment of inertia of the arrangement about the axis normal to the plane and passing through the point P is :

asked Dec 11, 2018 by pady_1

0 answers

Let $I_n = \int \tan^n x\; dx, \; (n > 1)$. If $I_4 + I_6 = a \tan^5 x + bx^5 + C$, where $C$ is a constant of integration, then the ordered pair $(a, b)$ is equal to

asked Dec 11, 2018 by pady_1

1 answer

Hysteresis loops for two magnetic materials A and B are given below : These materials are used to make magnets for electric generators, transformer core and electromagnet core. Then it is proper to use :

asked Dec 11, 2018 by pady_1

0 answers

If the capacitance of a nanocapacitor is measured in terms of a unit $'u'$ made by combining the electronic charge $'e'$, Bohr radius $'a_0$, Planck's constant $'h'$ and speed of light $'c'$ then :

asked Dec 11, 2018 by pady_1

0 answers

A mass â€˜mâ€™ is supported by a massless string wound around a uniform hollow cylinder of mass m and radius R. If the string does not slip on the cylinder, with what acceleration will the mass fall on release?

asked Dec 11, 2018 by pady_1

0 answers

The rate of a reaction doubles when its temperature changes from 300 K to 310 K. Activation energy of such a reaction will be : ($ R = 8.314 \; JK^{-1} mol^{-1}$ and $log\;2 = 0.301$)

asked Dec 11, 2018 by pady_1

0 answers

Let $a, b \in R$ be such that the function $f$ given by $f(x) = In \; |x| + bx^2 + ax, \; \; x \neq 0$ has extreme values at $x = -1$ and $x = 2$ Statement 1 : $f$ has focal maximum at $x = -1$ and at $x = 2$ Statement 2 : $ a = \frac{1}{2}$ and $b = \frac{-1}{4}$

asked Dec 11, 2018 by pady_1

0 answers

Water is flowing continuously from a tap having an internal diameter $8 \times 10^{-3}$m. The water velocity as it leaves the tap is $0.4\; ms^{-1}$. The diameter of the water stream at a distance $2 \times 10^{-1}$ m below the lap is close to :

asked Dec 11, 2018 by pady_1

0 answers

The main product of the following reaction is $C_6H_5CH_2CH(OH)CH(CH_3)_2 \qquad \underrightarrow{\qquad conc.H_2SO_4 \qquad} \qquad ?$

asked Dec 11, 2018 by pady_1

0 answers

The surface of a metal is illuminated with the light of 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. The work function of the metal is (hc = 1240 eV nm)

asked Nov 29, 2018 by pady_1

0 answers

If the straight lines $\frac{x-1}{k}=\frac{y-2}{2}=\frac{z-3}{3}$ and $\frac{x-2}{3}=\frac{y-3}{k}=\frac{z-1}{2}$ intersect at a point, then the integer k is equal to

asked Nov 29, 2018 by pady_1

0 answers

The resultant of two forces $P \;N$ and $3\; N$ is a force of $7\; N$. If the direction of the $3\; N$ force were reversed, the resultant would be $\sqrt{19} N$. The value of $P$ is :

asked Nov 29, 2018 by pady_1

0 answers

A string is stretched between fixed points separated by 75.0 cm. It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequencies between these two. Then, the lowest resonant frequency for this string is :

asked Nov 13, 2018 by pady_1

0 answers

If the coefficient of $x^7$ in $\begin{bmatrix} ax^2 + \begin{pmatrix} \frac{1}{bx} \end{pmatrix} \end{bmatrix}^{11} $ equals the coefficient of $x^{-7}$ in $\begin{bmatrix} ax^2 - \begin{pmatrix} \frac{1}{bx} \end{pmatrix} \end{bmatrix}^{11} $, then $a$ and $b$ satisfy the relation :

asked Nov 5, 2018 by pady_1

0 answers

The block of mass M moving on the frictionless horizontal surface collides with the spring of spring constant $k$ and compresses it by length $L$. The maximum momentum of the block after collision is :

asked Nov 5, 2018 by pady_1

0 answers

The coefficient of $x^n$ in expansion of $(1+x)(1-x)^n$ is

asked Nov 5, 2018 by pady_1

0 answers

In the circuit shown in the figure, the input voltage $V_i$ is 20 V, $V_{BE}$ = 0 and $V_{CE}$ = 0. The value of $I_B, \; I_C$ and $\beta$ are given by

asked Aug 21, 2018 by pady_1

1 answer

Match the interhalogen compounds of column I with the geometry in column II and assign the correct code .

asked Aug 21, 2018 by pady_1

1 answer

Which of the following is an analgesic ?

asked Aug 21, 2018 by pady_1

2 answers

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group ?

asked Aug 21, 2018 by pady_1

1 answer

Certain quantity of water cools from $70^°C$ to $60^°C$ in the first 5 minutes and to $54^°C$ in the next 5 minutes. The temperature of the surroundings is;

asked Aug 20, 2018 by pady_1

1 answer

A gas is taken through the cycle $A \to B \to C \to A$, as shown. What is the net work done by the gas ?

asked Aug 20, 2018 by pady_1

1 answer

When a string is divided into three segments of length $l_1,\; l_2 \;and\; l_3$, the fundamental frequencies of these three segments are $v_1, \;v_2 \;and \;v_3$ respectively. The original functamental frequency (v) of the string is :

asked Aug 20, 2018 by pady_1

1 answer

Four electric charge +q, +1, - q and -q are placed at the corners of a square of side 2L. (see figure). The electric potential at point A, midway between the two charge +q and +q, is :

asked Aug 16, 2018 by pady_1

1 answer

A thin ring of radius R meter has charge q coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of f revolutions/s. The value of magnetic induction in $Wb/m^2$ at the centre of the ring is –

asked Jul 26, 2018 by pady_1

1 answer

In thermodynamic processes which of the following statements is not true ?

asked Jul 26, 2018 by pady_1

1 answer

A thin rod of length L and mass M is bent at it midpoint into two halves so that the angle between them is 90º. The moment of inertia of the bent rod about an axis passing through the bending point and perpendicular to the plane defined by the two halves of the rod is -

asked Jul 26, 2018 by pady_1

1 answer

A black body is at $727^{\circ}C$. It emits energy at a rate which is proportional to:

asked Jul 26, 2018 by pady_1

1 answer

A particle moves along a straight line OX. At a time t (in seconds) the distance x (in metres) of the particle from O is given by $X=40+12t-t^{3}$. How long would the particle travel before coming to rest: -

asked Jul 25, 2018 by pady_1

1 answer

The temperature of inversion of a thermocouple is $620^{\circ}C$ and the neutral temperature is $300^{\circ}C$. What is the temperature of cold junction :

asked Jul 24, 2018 by pady_1

1 answer

The peak voltage in the output of a half wave diode rectifier fed with a sinusoidal signal without filter is 10V. The d. c. component of the output voltage is :-

asked Jul 24, 2018 by pady_1

1 answer

The time period of a mass suspended from a spring is T. If is the spring is cut into four equal parts and the same mass is suspend from one of the parts, then the new time period will be -

asked Jul 24, 2018 by pady_1

1 answer

The Wien's displacement law express relation between : -

asked Jul 23, 2018 by pady_1

2 answers

A scientist says that the efficiency of his heat engine which work at source temperature $127^{\circ} C$ and sink temperature $27^{\circ} C$ to $26%$, then

asked Jul 20, 2018 by pady_1

1 answer

For a hollow cylinder & a solid cylinder rolling without slipping on an inclined plane, then which of these reaches earlier on the ground :

asked Jul 20, 2018 by pady_1

0 answers

Two identical balls A and B are moving with velocity $+0.5\; ms^{–1}$ and $– 0.3\; ms^{–1}$ respectively. They collide head on elastically then their velocities after collision will be :

asked Jun 15, 2018 by pady_1

0 answers

While sorting some buttons, Tom put 1 button in the first box, 4 buttons in the second box, 16 buttons in the third box, and 64 buttons in the fourth box. If this pattern continues, how many buttons will Tom put in the fifth box?

asked Dec 31, 2015 by pady_1

0 answers

Alisha is driving down to Shimoga for a vacation, and has already traveled 196.02 kms. If he has traveled \large\frac{33}{50} of the distance, then what is the total distance he drives to get to Shimoga?

asked Dec 31, 2015 by pady_1

0 answers

Find the product: $\large\frac{4}{3} \times \large\frac{7}{9}$

asked Dec 31, 2015 by pady_1

0 answers

What \% is 900 of 2700?

asked Dec 31, 2015 by pady_1

0 answers

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