Recent questions tagged 60

When a block of mass M is suspended by a long wire of length L, the length of the wire become (L+l).The elastic potential energy stored in the extended wire is

asked Jul 8, 2019 by pady_1

1 answer

Silver chlorides dissolve in excess of $NH_4OH$. The cation present in this solution is :

asked Dec 19, 2018 by pady_1

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Which of the following is the anhydride of $HNO_3$ ?

asked Dec 19, 2018 by pady_1

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Which of the following has the lowest bond angle ?

asked Dec 19, 2018 by pady_1

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What are the products obtained when ammonia is reacted with excess chlorine ?

asked Dec 11, 2018 by pady_1

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When forces $F_1, \; F_2, \; F_3$ are acting on particle of mass $m$ such that $F_2$ and $F_3$ are mutually perpendicular, then the particle remains stationary . If the force $F_1$ is now removed then the acceleration of the particle is :

asked Dec 11, 2018 by pady_1

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A body executes simple harmonic motion.The potential energy (PE), the kinetic energy (KE) and total energy (TE) are measured as function of displacement $x$. Which of the following statement is true ?

asked Dec 11, 2018 by pady_1

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Let the orthocenter and centroid of a triangle be A (-3, 5) and B (3, 3) respectively. If C is the circumcentre of this triangle, then the radius of the circle having line segement AC as diameter, is :

asked Dec 11, 2018 by pady_1

1 answer

A body of mass $m = 10^{-2} kg$ is moving in a medium and experiences a frictional force $F= -kv^2$. Its initial speed is $v_0 = 10\; ms^{-1}$. If after 10 s, its energy is $\frac{1}{8} mv_0^2$, the value of $k$ will be :

asked Dec 11, 2018 by pady_1

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The hottest region of Bunsen flame shown in the figure below is : <br>

asked Dec 11, 2018 by pady_1

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The cation that will not be precipitated by $H_2S$ in the presence of $dil. HCl$ is :

asked Dec 11, 2018 by pady_1

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If $x = -1$ and $x = 2$ are extreme points of $f(x) = \alpha \log |x| + \beta x^2 + x$, then

asked Dec 11, 2018 by pady_1

1 answer

The term independent of $x$ is expansion of $\begin{pmatrix} \frac{x+1}{x^{2/3}-x^{1/3} + 1 } - \frac{x-1}{x - x^{1/2}} \end{pmatrix}^{10}$ is

asked Dec 11, 2018 by pady_1

1 answer

Proton, Deuteron and alpha particle of the same kinetic energy are moving in circular trajectories in a constant magnetic field. The radii of proton, deuteron and alpha particle are respecctively $r_p$, $r_d$ and $r_{\alpha}$. Which one of the following relations is correct ?

asked Dec 11, 2018 by pady_1

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For $x \in (0, \frac{5 \pi}{2})$, define $f(x) = \int_0^x \;\sqrt{t} \;\sin t \;dt$. Then $f$ has

asked Dec 11, 2018 by pady_1

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The equation of a wave on a string of linear mass density $0.04\; kg\;m^{-1}$ is given by$ y = 0.02 (m) \sin [ 2 \pi (\frac{t}{0.04 (s)} - \frac{x}{0.50(m)} ) ]$. The tension in the string is

asked Dec 11, 2018 by pady_1

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Buna-N synthetic rubber is a copolymer of :

asked Nov 29, 2018 by pady_1

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Given $E^o_{\frac{Cr^3+}{Cr}}=-0.72V$,$E^o_{\frac{Fe^2+}{Fe}}=-0.42V$.The potential for the cell $Cr|Cr^{3+}(0.1 M)| |Fe^{2+}(0.01 M)|Fe$ is

asked Nov 29, 2018 by pady_1

1 answer

The potential at a point $x$ (measured in $\mu m$) due to some charges situated on the $x$-axis is given by : $V(x) = 20/(x^2 - 4)$ volt <br> The electric field $E$ at $x=4 \mu m$ is given by :

asked Nov 29, 2018 by pady_1

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According to Bohr's theory, the angular momentum of an electron in 5th orbit is :

asked Nov 13, 2018 by pady_1

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A lizard, at an initial distance of 21 cm behind an insect, moves from rest with an acceleration of $2\; cm/s^2 $ and pursues the insect which is crawling uniformly along a straight line at a speed of 20 cm/s. The the lizard will catch the insect after :

asked Nov 5, 2018 by pady_1

0 answers

When two tuning forks (fork 1 and fork 2) are sounded simultaneously, 4 beats per second are heard. Now, some tape is attached on the prong of the fork 2. When the tuning forks are sounded again, 6 beats per second are heard. If the frequency of fork 1 is 200 Hz, then what was the original frequency of fork 2 ?

asked Nov 5, 2018 by pady_1

0 answers

Let $\overrightarrow{a}, \overrightarrow{b}$ and $\overrightarrow{c}$ be three non-zero vectors such that no two of these are collinear. If the vector $\overrightarrow{a} + 2 \overrightarrow{b} $ is collinear with $\overrightarrow{c}$ and $\overrightarrow{b} + 3 \overrightarrow{c}$ is collinear with $\overrightarrow{a}$ ($\lambda$ being some non-zero scalar) then $\overrightarrow{a} + 2\overrightarrow{b} + 6 \overrightarrow{c}$ equals

asked Nov 5, 2018 by pady_1

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Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below : <br> $BrO_4^- \xrightarrow{1.82 V} BrO_3^- \xrightarrow{1.5 V} HBrO \xrightarrow{1.595 V} Br_2 \xrightarrow{1.0652 V} Br^-$ <br> Then the species undergoing disproportionation is

asked Aug 21, 2018 by pady_1

1 answer

Which of the following components provides sticky character to the bacterial cells ?

asked Aug 21, 2018 by pady_1

1 answer

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant ?

asked Aug 21, 2018 by pady_1

1 answer

Ectopic pregnancies are referred to as-

asked Aug 21, 2018 by pady_1

1 answer

For a given exothermic reaction, $K_P$ and $K_P'$ are the equilibrium constants at temperatures $T_1$ and $T_2$ respectively. Assuming that heat of reaction is constant in temperatures range between $T_1$ and $T_2$ , it is readily observation that:

asked Aug 20, 2018 by pady_1

1 answer

Roasting of sulphides gives the gas X as a byproduct. This is colorless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a reducing agent and its acid has never been isolated. The gas X is -

asked Aug 20, 2018 by pady_1

1 answer

When $Cl_2$ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from :

asked Aug 20, 2018 by pady_1

1 answer

If the enthalpy change for the transition of liquid water to steam is $30\; kJ \; mol^{–1}$ at $27^oC$, the entropy change for the process would be :

asked Aug 16, 2018 by pady_1

1 answer

Which one of the following compounds has the most acidic nature? CH

asked Jul 26, 2018 by pady_1

1 answer

For the reaction, $N_2+3H_2\to 2NH_3$, $\frac {d[NH_3]}{dt}=2\times10^{-4} mol L^{-1} S^{-1}$, The value of $\frac{-d[H_2]}{dt}$ would be

asked Jul 26, 2018 by pady_1

0 answers

Base strength of - (i) $H_3C\overset{\Theta}{C} H_2$ (ii) $H_2C=\overset{\Theta}{C} H$ and (iii) $H-C \equiv \overset{\Theta}{C}$ is in the order of -

asked Jul 26, 2018 by pady_1

0 answers

0.5 molal aqueous solution of a weak acid (HX) is $20 \%$ ionised. If $K_f$ for water is $1.86 K\; kg\; mol^{-1}$, the lowering in freezing point of the solution is :

asked Jul 26, 2018 by pady_1

1 answer

Given: The mass of electron is $9.11\times10^{-31}$Kg Planck constant is $6.626\times10^{-34}$Js, the uncertainty involved in the measurement of velocity within a distance of 0.1Å is:-

asked Jul 25, 2018 by pady_1

1 answer

The mole fraction of the solute in one molal aqueous solution is :-

asked Jul 24, 2018 by pady_1

1 answer

Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere :-

asked Jul 24, 2018 by pady_1

1 answer

What is the entropy change (in $JK^{–1} mol^{–1}$) when one mole of ice is converted into water at $0^oC$ ? (The enthalpy change for the conversion of ice to liquid water is $6.0 \;KJ\; mol^{–1}\; at \;0^oC$)

asked Jul 24, 2018 by pady_1

1 answer

In a closed insulated container a liquid is stirred with a paddle to increase the temperature which of the following is true : -

asked Jul 23, 2018 by pady_1

1 answer

The incorrect IUPAC name is : -

asked Jul 20, 2018 by pady_1

1 answer

$CF_2$ = $CF_2$ is monomer of :

asked Jul 20, 2018 by pady_1

1 answer

Glucose +x phenyl hydrazine $\rightarrow$ osazone 'x' will be :

asked Jun 15, 2018 by pady_1

1 answer

Horse : Mare ::

asked Dec 31, 2015 by pady_1

0 answers

Kirk is deciding what to order at the ice cream shop. He can choose a chocolate cone, plain cone, or waffle cone, and he can have strawberry or mint ice cream. How many different combinations can Kirk order?

asked Dec 31, 2015 by pady_1

1 answer

Each side of a square notepad is 11 centimetres long. What is the notepad's perimeter?

asked Dec 31, 2015 by pady_1

0 answers

A factory makes 2652 cars every week. How many items are manufactured in $\large\frac{1}{4}$ year?

asked Dec 31, 2015 by pady_1

0 answers

Andrew is two years older than Beatrice, and Chris is three years younger than Beatrice.The product of Andrew's age and Chris' age is 66. How old is Beatrice?

asked Dec 31, 2015 by pady_1

1 answer

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