Recent questions tagged 75

Two similar thin equi-convex lenses, of focal length f each, are kept coaxially in contact with each other such that the focal length of the combination is $F_1$.When the space between the two lenses is filled with glycerin (which has the same refractive index $(\mu = 1.5)$ as that of glass) then the equivalent focal length is $F_2$. The ratio $F_1 : F_2$ will be :

asked Jul 8, 2019 by pady_1

1 answer

Mortar is a mixture of :

asked Dec 19, 2018 by pady_1

0 answers

Chlorine is passed into dilute cold KOH solution. What are the oxidation number of chlorine in the products formed ?

asked Dec 19, 2018 by pady_1

0 answers

Which of the following is an acid?

asked Dec 19, 2018 by pady_1

0 answers

What is $Y$ in the following reaction ? $C_2H_5I + NaOC_2H_5 \to X + NaI$ $X + 2HI \xrightarrow{\Delta} 2Y + H_2O$

asked Dec 11, 2018 by pady_1

0 answers

A conducting square loop of side $L$ and resistance $R$ moves in its plane with a uniform velocity $v$ perpenticular to one of its sides. A magnetic induction $B$ constant in time and space, pointing perpendicular and into the plane at the loop exists everywhere with half the loop outside the field, aas shown in figure. The induced emf is :

asked Dec 11, 2018 by pady_1

0 answers

The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter the change in the resistance of the wire will be :

asked Dec 11, 2018 by pady_1

0 answers

The major product of the following reaction is :

asked Dec 11, 2018 by pady_1

0 answers

The increasing order of the reactivity of the following halides for the $S_N1$ reaction is :

asked Dec 11, 2018 by pady_1

0 answers

$\begin{align} \displaystyle{\lim_{n \to \infty} \begin{pmatrix} \frac{(n+1) (n+2) ...3n}{n^{2n}} \end{pmatrix} }^{1/n} \end{align}$ is equal to :

asked Dec 11, 2018 by pady_1

1 answer

For $x>0$, let $f(x) = \begin{align} \int_1^x \frac{\log t}{1+t} dt \end{align}$. Then $f(x) + f(\frac{1}{x})$ is equal to :

asked Dec 11, 2018 by pady_1

1 answer

On heating an aliphatic primary amine with chloroform and ethanolic potassium hydroxide, the organic compound formed is:

asked Dec 11, 2018 by pady_1

0 answers

A sonometer wire of length 1.5 m is made of steel. The tension in it produces an elastic strain of 1 %. What is the fundamental frequency of steel if density and elasticity of steel are $7.7 \times 10^3 \;kg/m^3$ and $2.2 \times 10^{11}N/m^2$ respectively?

asked Dec 11, 2018 by pady_1

0 answers

Aspirin is known as :

asked Dec 11, 2018 by pady_1

0 answers

The magnetic moment (spin only) of $[NiCl_4]^{2-}$ is

asked Dec 11, 2018 by pady_1

0 answers

Let $A$ be a $ 2 \times 2$ matrix with non-zero entries and let $A^2 =I$, where $I$ is $2 \times 2$ identity matrix. Define $Tr(A)$ = sum of diagonal elements of $A$ and $|A|$ = determinant of matrix A. Assertion : Statement -1: $Tr(A) = 0$ Reason : Statement-2 : $|A| =1$

asked Dec 11, 2018 by pady_1

0 answers

If $|z - \frac{4}{z}| = 2$, then the maximum value of $|z|$ is equal to

asked Nov 29, 2018 by pady_1

0 answers

A spherical solid ball of volume V is made of a material of density $p_1$. It is falling through a liquid of density $P_2(p_2 <p_1)$. Assume that the liquid applies a viscous force on the ball that is proportional to the square of its speed v, i.e., $F_{viscous} = -kv^2(k>0).$ The terminal speed of the ball is

asked Nov 29, 2018 by pady_1

0 answers

A 2 kg block slides on a horizontal floor with a speed of 4 m/s. It strikes a uncompressed spring, and compresses it till the block is motionless. The kinetic friction force is 15 N and spring constant is 10,000 N/m. The spring compresses by :

asked Nov 29, 2018 by pady_1

0 answers

The standard enthalpy of formation $(\Delta H_f^{\circ})$ at 298 K for methane, $CH_4 (g)$, is $-74.8 \; kJ\;mol^{-1}$. The additional information required to determine the average energy for $C-H$ bond formation would be :

asked Nov 13, 2018 by pady_1

0 answers

If the pair of lines $ax^2 + 2(a+b) xy + by^2 = 0 $ lie along diameters of a circle and divide the circle into four sectors such that the area of one of the sectors is thrice the area of another sector, then :

asked Nov 5, 2018 by pady_1

0 answers

A magnetic needle is kept in a non-uniform magnetic field. It experiences :

asked Nov 5, 2018 by pady_1

0 answers

If $t_1$ and $t_2$ are the times of flight of two particles having the same velocity $u$ and range $R$ on the horizontal, then $t^2_1 + t^2_2$ is equal to

asked Nov 5, 2018 by pady_1

0 answers

The correct order of N-compounds in its decreasing order of oxidation states is

asked Aug 21, 2018 by pady_1

2 answers

Select the correct route for the passage of sperms in male frogs :

asked Aug 21, 2018 by pady_1

2 answers

Antivenom injection contains preformed antibodies while polio drops that are administered into the body contain -

asked Aug 21, 2018 by pady_1

1 answer

The function of the gap junction is to -

asked Aug 21, 2018 by pady_1

1 answer

Reason of lanthanoid contraction is :

asked Aug 20, 2018 by pady_1

1 answer

Which of these is not a monomer for a high molecular mass silicone polymer ?

asked Aug 20, 2018 by pady_1

1 answer

Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour :

asked Aug 20, 2018 by pady_1

1 answer

For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order? (At nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

asked Aug 16, 2018 by pady_1

1 answer

Crystal field stabilization energy for high spin$d^4$ octahedral complex is

asked Jul 26, 2018 by pady_1

2 answers

The stability of +1 oxidation state increases in the sequence :

asked Jul 26, 2018 by pady_1

1 answer

Which one of the following statements is not true ?

asked Jul 26, 2018 by pady_1

1 answer

The correct order of increasing thermal stability of $K_2CO_3, MgCO_3, CaCO_3$ and $BeCO_3$ is:

asked Jul 26, 2018 by pady_1

1 answer

The enthalpy of hydrogenation of cyclohexene is $-119.5KJmol^{-1}$. If resonance energy of benzene is $-150.4KJmol^{-1}$ its enthalpy of hydrogenation would be:-

asked Jul 25, 2018 by pady_1

0 answers

A solution has a 1 :4 mole ratio of pentane to hexane. The vapour pressures of the pure hydrocarbons at $20^{\circ}$C are 440 mm Hg for pentane and 120 mm Hg for hexane. The mole fraction of pentane in the vapour phase would be-

asked Jul 24, 2018 by pady_1

1 answer

Considering $H_2 O$ as a weak field ligand, the number of unpaired electrons in $[MN(H_2O_6)]^{2+}$ will be – (At. no. of Mn = 25)

asked Jul 24, 2018 by pady_1

1 answer

In this reaction : $CH_3CHO + HCN \to CH_3CH(OHCN) \overset{H.OH}{\rightarrow} CH_3CH(OH)COOH$ an asymmetric centre is generated. The acid obtained would be :

asked Jul 24, 2018 by pady_1

1 answer

Which of the following has $p_{\pi}$ – $d_{\pi}$ bonding

asked Jul 23, 2018 by pady_1

1 answer

Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (at. wt = 78.4) then minimum molecular weight of peroxidase anhydrous enzymes is : -

asked Jul 20, 2018 by pady_1

1 answer

Which of the following compound is electron defficient :

asked Jul 20, 2018 by pady_1

1 answer

The chiral centre is absent in :

asked Jun 15, 2018 by pady_1

1 answer

Find the odd one out

asked Dec 31, 2015 by pady_1

0 answers

The pie chart shows the amount of time each day that Jethro spends on various activities. If this information were displayed using a bar graph with hours on the vertical axis, what would be the height of the bar for sleep?

asked Dec 31, 2015 by pady_1

1 answer

A thread of length 61.79 metres was cut into pieces that were 1.67 metres long. How many pieces was it cut into?

asked Dec 31, 2015 by pady_1

1 answer

The parking lot of the Shopping Complex has a capacity of 154 cars. On Thursday $\large\frac{3}{14}$ of the parking lot was occupied with cars. How many additional cars could park there?

asked Dec 31, 2015 by pady_1

1 answer

Garrett wants to ride the bumper cars 2 times and the Ferris wheel 2 times. It costs 2 tickets to ride the bumper cars and 4 tickets to ride the Ferris wheel. How many tickets does Garrett need?

asked Dec 31, 2015 by pady_1

0 answers

Ask Questions, Get Answers