Recent questions tagged 57

A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of $2.5 \times 10^{-2}$ $\frac{ N}{m}$. The pressure inside the bubble equals at a point $Z_0$ below the free surface of water in a container. Taking $g = 10 \frac{m}{s^2} $ density of water $= 103\frac{ kg}{m^3}$, the value of $Z_0$ is :-

asked Jul 8, 2019 by pady_1

1 answer

How much litres of $CO_2$ at STP will be formed when $100 \;mL$ of $M \; H_2SO_4$ reacts with excess of $Na_2CO_3$ ?

asked Dec 19, 2018 by pady_1

0 answers

What is the oxidation state of Fe in the product formed when acidified potassium ferrocyanide is treated with $H_2O_2$ ?

asked Dec 19, 2018 by pady_1

0 answers

Which of the following ions is colourless in aqueous solution ?

asked Dec 19, 2018 by pady_1

0 answers

What is the molecular formula of borazole ?

asked Dec 11, 2018 by pady_1

0 answers

In a transformer, number of turns in the primary are 140 and that in the secondary are 280. If current in primary is 4 A, then that in the secondary is :

asked Dec 11, 2018 by pady_1

0 answers

A spring of spring constant $5 \times 10^3 N/m$ is stretched initially by 5 cm from the unstreched position. Then the work required to stretch it further by another 5 cm is

asked Dec 11, 2018 by pady_1

0 answers

PQR is a triangular park with PQ = PR = 200 m. A. T. V. tower stands at the mid-point of QR. If the angles of elevation of the top of the tower at P, Q and R are respectively $45^{\circ},\; 30^{\circ}$ and $30^{\circ}$, then the height of the tower (in m) is :

asked Dec 11, 2018 by pady_1

2 answers

The variation of acceleration due to gravity g with distance d from centre of the earth is best represented by (R = Earth's radius)

asked Dec 11, 2018 by pady_1

0 answers

Which of the following statements about low density polythene is FALSE ?

asked Dec 11, 2018 by pady_1

0 answers

Match the polymers in column-A with their main uses in column-B and choose the correct answer :

asked Dec 11, 2018 by pady_1

0 answers

If $(10)^9 + 2(11)^1 (10)^8 + 3(11)^2 (10)^7 + ....+ 10(11)^9 = k(10)^9$, then $k$ is equal to

asked Dec 11, 2018 by pady_1

1 answer

The $z$ is a complex number of unit modulus an argument $\theta$, then $arg \begin{pmatrix}\frac{1+z}{1+ \overline{z}} \end{pmatrix}$ equals

asked Dec 11, 2018 by pady_1

1 answer

A diatomic molecule is made of two masses $m_1$ and $m_2$ which are separated by a distance $r$. If we calculate its rotational energy by applying Bohr's rule of angular momentum quantization, its energy will be given by (n is an integer)

asked Dec 11, 2018 by pady_1

0 answers

If $\omega (\neq 1)$ is a cube root of unity, and $(1 + \omega)^7 = A + B \omega$. Then $(A, B)$ equals

asked Dec 11, 2018 by pady_1

0 answers

An initially parallel cylindrical beam travels in a medium of refractive index $\mu(I) = \mu_0 + \mu_2I$, where $\mu_0 $ and $\mu_2$ are positive constants and $I$ is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius. QUESTION : The initial shape of the wave front of the beam is

asked Dec 11, 2018 by pady_1

0 answers

The bond dissociation energy of $B-F$ in $BF_3$ is $646 \; kJ\; mol^{-1}$ whereas that of $C-F$ in $CF_4$ is $515 \; kJ\; mol^{-1}$. The correct reason for higher $B-F$ bond dissociation energy as compared to that of $C-F$ is :

asked Nov 29, 2018 by pady_1

0 answers

Which one of the following pairs of species have the same bond order?

asked Nov 29, 2018 by pady_1

0 answers

A Carnot engine, having an efficiency of $\eta = 1/10$ as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is :

asked Nov 29, 2018 by pady_1

0 answers

The IUPAC name of the compound shown below is :

asked Nov 13, 2018 by pady_1

0 answers

Three houses are available in a locality. Three persons apply for the houses. Each applies for one house without consulting others. The probability that all the apply for the same house, is :

asked Nov 5, 2018 by pady_1

0 answers

Two point charges $+8 q$ and $-2q$ are located at $x=0$ and $x=L$ respectively. The location of a point on the $x$-axis at which the net electric field due to these two point charges is zero is :

asked Nov 5, 2018 by pady_1

0 answers

A line with direction cosines proportional to 2, 1, 2 meets each of the lines $x=y+a=z$ and $x+a=2y=2z$. The co-ordinates of each of the point of intersection are given by

asked Nov 5, 2018 by pady_1

0 answers

The correction factor 'a' to the ideal gas equation corresponds to

asked Aug 21, 2018 by pady_1

2 answers

Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of :

asked Aug 21, 2018 by pady_1

1 answer

Which of the following features is not present in Periplaneta americana ?

asked Aug 21, 2018 by pady_1

1 answer

Which of the following are not membrane bound ?

asked Aug 21, 2018 by pady_1

1 answer

Which of the following statements is correct for the spontaneous adsorption of a gas?

asked Aug 20, 2018 by pady_1

1 answer

A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is $ 2.72 \; g \;cm^{–3}$. The molar mass of the metal is : [NA Avogadro's constant = $6.02 \times 10^{23} mol^{–1}$]

asked Aug 20, 2018 by pady_1

1 answer

Buffer solutions have constant acidity and alkalinity because

asked Aug 20, 2018 by pady_1

1 answer

Which of the following is correct option for free expansion of an ideal gas under adiabatic condition ?

asked Aug 16, 2018 by pady_1

1 answer

Given are cyclohexanol (I), acetic acid (II) 2,4,6- trinitrophenol (III) and phenol (IV). In these the order of decreasing acidic character will be

asked Jul 26, 2018 by pady_1

1 answer

Given : (i) $cu^{2+}+2e^{-}\to Cu,E^{\circ}=0.337 V$ (i) $cu^{2+}+e^{-}\to Cu,E^{\circ}=0.153V$ Electrode potential Eº for the reaction,$ Cu^{+} + e^{–}\rightarrow Cu$ will be :

asked Jul 26, 2018 by pady_1

1 answer

Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the $H^+$ ion concentration in the mixture ?

asked Jul 26, 2018 by pady_1

0 answers

The reaction of hydrogen an iodic monochloride is given as $H_{2(g)} +2ICl_{(g)} \to 2HCl_{(g)}+I_{2(g)} $ Mechanism B : $H_{2(g)} +ICl_{(g)} \to HCl_{(g)}+HI_{(g)} $; Slow $HI_{(g)} +ICl_{(g)} \to HCl_{(g)}+I_{2(g)} $; Fast Which of the above mechanism(s) can be consistent with the given information about the reaction :

asked Jul 26, 2018 by pady_1

1 answer

The human body does not produce:-

asked Jul 25, 2018 by pady_1

1 answer

In a face –centered cubic lattice, a unit cell is shared equally by how many unit cells :-

asked Jul 24, 2018 by pady_1

1 answer

The hormone that helps in the conversion of glucose to glycogen is :-

asked Jul 24, 2018 by pady_1

1 answer

For the reaction : $C_3H_8(g) + 5O_2 (g) \to 3CO_2(g) + 4H_2O(l)$ at constant temperature, $\Delta H - \Delta E$ is :

asked Jul 24, 2018 by pady_1

1 answer

Solution of 0.1N $NH_4 OH$ and 0.1N $NH_4Cl$ has pH 9.25, Then find out $PK_b$ of $NH_4OH$ : -

asked Jul 23, 2018 by pady_1

1 answer

Which of following give positive Fehling solution test

asked Jul 20, 2018 by pady_1

1 answer

Which reagent converts propene to 1-propanol :

asked Jul 20, 2018 by pady_1

1 answer

Which of the following gives most easily electrophilic substitution reaction :

asked Jun 15, 2018 by priyanka.c

1 answer

Poles : Magnet :: ? : Battery

asked Dec 31, 2015 by pady_1

1 answer

The class size of the class 0-10 is

asked Dec 31, 2015 by pady_1

0 answers

The corner store sells 218.1 liters of guava juice on Tuesday and 13.29 liters more than this amount on Wednesday. The following day, 11.35 liters less guava juice than on Wednesday were sold. How many liters of guava juice were sold on the Thursday?

asked Dec 31, 2015 by pady_1

1 answer

A herd of cows gives 4 litres of milk each day. But each cow gives one-third of total milk each day. They give 24 litres milk in six days. How many cows are there in the herd?

asked Dec 31, 2015 by pady_1

1 answer

A quiz has thirty questions whose answers can only be correct or incorrect.A correct answer scores 8 points, but 3 points are deducted for every incorrect answer. Gina did the quiz and scored a total of 152 points. How many questions did she get correct?

asked Dec 31, 2015 by pady_1

1 answer

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