Recent questions tagged 61

A disc of radius 2m and mass 100 kg rolls on a horizontal floor.Its center of mass has speed of $20\frac{cm}{s}$.How much work is needed to stop it?

asked Jul 8, 2019 by pady_1

1 answer

Which one of the following can be used as an anaesthelic ?

asked Dec 19, 2018 by pady_1

0 answers

In Rutherford's $\alpha$-ray scattering experiment, the alpha particles are detected using a screen coated with :

asked Dec 19, 2018 by pady_1

0 answers

Which of the following is the isotope of $Ge_{32}^{76} $ ?

asked Dec 19, 2018 by pady_1

0 answers

What are the products formed when chlorine is passed through aqueous hypo solution ?

asked Dec 11, 2018 by pady_1

0 answers

Two forces are such that the sum of their magnitudes is 18 N and their resultant which has magnitude 12 N, is perpendicular to the smaller force. Then the magnitudes of the forces are :

asked Dec 11, 2018 by pady_1

0 answers

In the nuclear fusion reaction, $_1^2H +_1^3H \to _2^4He+n$ given that the repulsive potential energy between the two nuclei is $7.7 \times 10^{-14} J$, the temperature at which the gases must be heated to initiate the reaction is nearly [Boltzmann's constant $k = 1.38 \times 10^{-23} J/K$] :

asked Dec 11, 2018 by pady_1

0 answers

The total number of lone pair of electrons in $I^-_3$ ion is :

asked Dec 11, 2018 by pady_1

0 answers

1 gram of a carbonate $(M_2CO_3)$ on treatment with excess HCl produces $0.01186 \;mole$ of $CO_2$. The molar mass of $M_2CO_3$ in $g\; mol^{–1}$ is :

asked Dec 11, 2018 by pady_1

0 answers

If $f(x) + 2f (\frac{1}{x}) = 3x, \; x \neq 0$, and $S = \{ x \in R : f(x) = f(-x) \}$; then $S$ :

asked Dec 11, 2018 by pady_1

1 answer

In a certain town, 25% of the families own a phone and 15% own a car ; 65% families own neither a phone nor a car and 2,000 families own both a car and a phone. Consider the following three statements : (a) 5% families own both a car and a phone. (b) 35% families own either a car or a phone. (c) 40,000 families live in the town. Then :

asked Dec 11, 2018 by pady_1

1 answer

Which one of the following properties is not shown by NO?

asked Dec 11, 2018 by pady_1

0 answers

In an LCR circuit as shown below both switches are open initially. Now switch $S_1$ is closed, $S_2$ kept open. (q is charge on the capacitor and $\tau = RC$ is capacitive time constant). Which of the following statement is correct?

asked Dec 11, 2018 by pady_1

0 answers

Which among he following will be named as dibromidobis (ethylene diamine) chrominum (III) bromide ?

asked Dec 11, 2018 by pady_1

0 answers

Among the following the maximum covalent character is shown by the compound :

asked Dec 11, 2018 by pady_1

0 answers

Let $\cos (\alpha + \beta) = \frac{4}{5}$ and let $\sin (\alpha - \beta) = \frac{5}{13}$, where $0 \leq \alpha, \; \beta \leq \frac{\pi}{4}$, then $\tan 2 \alpha = $

asked Dec 11, 2018 by pady_1

0 answers

Let a, b, c be such that $b(a+c) \neq 0$. If $\begin{vmatrix} a & a+1 & a-1 \\ -b & b+1 & b-1 \\ c & c-1 & c+1 \end{vmatrix}$ + $\begin{vmatrix} a+1 & b+1 & c-1 \\ a-1 & b-1 & c+1 \\ (-1)^{n+2}a & (-1)^{n+1}b & (-1)^n c \end{vmatrix} = 0$, then the value of 'n' is

asked Nov 29, 2018 by pady_1

0 answers

Amount of oxalic acid present in a solution can be determined by its titration with $KMnO_4$ solution in the presence of $H_2SO_4$. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

asked Nov 29, 2018 by pady_1

0 answers

Which of the following transitions in hydrogen atoms emit photons of highest frequency ?

asked Nov 29, 2018 by pady_1

0 answers

Which of the following molecules/ions does not contain unpaired electrons ?

asked Nov 13, 2018 by pady_1

0 answers

The resultant $R$ of two forces acting on a particle is at right angles to one of them and its magnitude is one third of the other force. The ratio of larger force to smaller one is :

asked Nov 5, 2018 by pady_1

0 answers

If a simple harmonic motion is represented by $\frac{d^2x}{dt^2} + \propto x = 0$, its time peroid is :

asked Nov 5, 2018 by pady_1

0 answers

A particle is acted upon by constant forces $4 \hat{i} +\hat{j}-3 \hat{k}$ and $3 \hat{i} + \hat{j} - \hat{k}$ which displace it from a point $\hat{i} + 2 \hat{j} + 3 \hat{k}$ to the point $5 \hat{i} + 4 \hat{j} + \hat{k}$. The work done in standard units by the forces is given by

asked Nov 5, 2018 by pady_1

0 answers

Among $CaH_2, BeH_2, BaH_2$, the order of ionic character is

asked Aug 21, 2018 by pady_1

1 answer

An example of colonial alga is :

asked Aug 21, 2018 by pady_1

1 answer

In higher vertebrates, the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormally and it attacks self-cells, then it leads to

asked Aug 21, 2018 by pady_1

2 answers

Cellular organelles with membranes are -

asked Aug 21, 2018 by pady_1

1 answer

Which of the following orders of ionic radii is correctly represented?

asked Aug 20, 2018 by pady_1

1 answer

Which is the strongest acid in the following ?

asked Aug 20, 2018 by pady_1

1 answer

Which one of the following statements is incorrect about enzyme catalysis ?

asked Aug 20, 2018 by pady_1

1 answer

The Van't Hoff factor i for a compound which undergoes dissociation in one solvent and association in other solvent is respectively :

asked Aug 16, 2018 by pady_1

1 answer

In a set of reactions, ethyl benzene yielded a product D.

asked Jul 26, 2018 by pady_1

1 answer

For the reaction $A + B\rightarrow$products, it is observed that : (1) On doubling the initial concentration of A only, the rate of reaction is also doubled and (2) On doubling the initial concentration of both A and B, there is a change by a factor of 8 in the rate of the reaction. The rate of this reaction is given by :

asked Jul 26, 2018 by pady_1

1 answer

Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH ?

asked Jul 26, 2018 by pady_1

1 answer

The efficiency of a fuel cell is given by :

asked Jul 26, 2018 by pady_1

1 answer

Copper sulphate dissolved in excess of KCN to give:-

asked Jul 25, 2018 by pady_1

1 answer

The chirality of the compound

asked Jul 24, 2018 by pady_1

1 answer

Among the following, the pair in which the two species are not isostructural is :-

asked Jul 24, 2018 by pady_1

1 answer

The reaction quotient (Q) for the reaction : <img src =""/> is given by $Q = \frac{[NH_3]^2}{[N_2] [H_2]^3}$. The reaction will proceed from right to left if : (where $K_C$ is the equilibrium constant )

asked Jul 24, 2018 by pady_1

1 answer

2 mole of ideal gas at $27^{\circ}C$ temperature is expanded reversibly from 2 lit. to 20 lit. Find entropy change (R = 2 cal/mol K) : -

asked Jul 23, 2018 by pady_1

1 answer

In preparation of alkene from alcohol using $Al_2O_3$ which is effective factor :-

asked Jul 20, 2018 by pady_1

1 answer

Correct order of stability is :

asked Jul 20, 2018 by pady_1

1 answer

The base found in DNA but not in RNA :

asked Jun 15, 2018 by pady_1

1 answer

Oceans : Deserts : : Waves : ?

asked Dec 31, 2015 by pady_1

1 answer

Maria is filling up her pencil case before school. She wants to bring one pen and one pencil. She has blue or purple pens, and she has pencils decorated with stripes, dots, dogs, or pumpkins. Given these choices, how many different combinations of items could Maria put in her pencil case?

asked Dec 31, 2015 by pady_1

1 answer

Tina has a 98 meter long chain. She needs to cut out pieces of length 70 cm from it. How many pieces can she cut?

asked Dec 31, 2015 by pady_1

1 answer

The product of $\large\frac{9}{7}$ and a number is 63. Find the number.

asked Dec 31, 2015 by pady_1

0 answers

A 4-pack of rubbers costs Rs 199.00. What is the unit price?

asked Dec 31, 2015 by pady_1

0 answers

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