Recent questions tagged 51

Body A of mass 4m moving with speed u collides with another body B of mass 2m, at rest. The collision is head on and elastic in nature. After the collision the fraction of energy lost by the colliding body A is :

asked Jul 8, 2019 by pady_1

1 answer

Which one of the following set of the quantum numbers is not possible for a 4p electron ?

asked Dec 19, 2018 by pady_1

0 answers

Which of the following is not true ?

asked Dec 19, 2018 by pady_1

0 answers

Which of the following reacts with ethanol to form chloroform ?

asked Dec 19, 2018 by pady_1

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Which one of the following reactions is an example of heterogeneous cataysis ?

asked Dec 11, 2018 by pady_1

0 answers

A child swinging on a swing in sitting position, stands up, then the time period of the swing will :

asked Dec 11, 2018 by pady_1

0 answers

A thin spherical conducting shell of radius $R$ has a charge $q$. Another charge $Q$ is placed at the centre of the shell. The electrostatic potential at a point $P$ at a distance $R/2$ from the centre of the shell is :

asked Dec 11, 2018 by pady_1

0 answers

If $\displaystyle\sum_{i=1}^{9} (x_i - 5) = 9$ and $ \displaystyle\sum_{i=1}^{9} (x_i - 5)^2 = 45$ then the standard deviation of the 9 items $x_1, \; x_2, .... x_9$ is :

asked Dec 11, 2018 by pady_1

1 answer

In the given circuit diagram when the current reaches steady state in the circuit, the charge on the capacitor of capacitance C will be :

asked Dec 11, 2018 by pady_1

0 answers

The distillation technique most suited for separating glycerol from spent-lye in the soap industry is :

asked Dec 11, 2018 by pady_1

0 answers

$1.4\; g$ of an organic compound was digested according to Kjeldahl's method and the ammonia evolved was absorbed in $60 \;mL$ of $M/10\; H_2 SO_4$ solution. The excess sulphuric acid required $20\; mL$ of $M/10 \;NaOH$ solution for neutralization. The percentage of nitrogen in the compound is :

asked Dec 11, 2018 by pady_1

0 answers

Let $a, b, c$ and d be non-zero numbers. If the point of intersection of the lines $4ax + 2ay + c = 0$ and $5bx + 2by + d = 0$ lies in the fourth quadrant and is equidistant from the two axes then

asked Dec 11, 2018 by pady_1

1 answer

The numbers of values of k, for which the system of equations $( k + 1) x + 8y = 4k $ kx + (k + 3)y = 3k - 1$ has no solution, is

asked Dec 11, 2018 by pady_1

1 answer

Assume that a neutron breaks into a proton and an electron. The energy released during this process is (Mass of neutron = $1.6725 \times 10^{-27}\;kg$; mass of proton = $1.6725 \times 10^{-27} \;kg$ mass of electron = $9 \times 10^{-31}\; kg $)

asked Dec 11, 2018 by pady_1

0 answers

The number of values of k for which the linear equations 4x + ky + 2z = 0; kx + 4y + z=0; 2x + 2y + z = 0 possess a non-zero solution is

asked Dec 11, 2018 by pady_1

0 answers

Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of $30^{\circ}$ with each other. When suspended in a liquid of density $0.8\;g\;cm^{-3}$, the angle remains the same. If density of the material of the sphere is $16\;g\; cm^{-3}$, the dielectric constant of the liquid is

asked Dec 11, 2018 by pady_1

0 answers

Calculate the wavelength (in nanometer) associated with a proton moving at $1.0 \times 10^3 \; ms^{-1}$ (Mass of proton = $1.67 \times 10^{-27} kg$ and $h = 6.63 \times 10^{-34} Js$ ):

asked Nov 29, 2018 by pady_1

0 answers

The absolute configuration of

asked Nov 29, 2018 by pady_1

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Photon of frequency $\nu$ has a momentum associated with it. If $c$ is the velocity of light, the momentum is :

asked Nov 29, 2018 by pady_1

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Two rigid boxes containing different ideal gases are placed on a table. Box A contains one mole of nitrogen at temperature $T_0$, while box B contains one mole of helium at temperature $(7/3) T_0$. The boxes are then put into thermal contact with each other, and heat flows between them until the gases reach a common final temperature (Ignore the heat capacity of boxes). Then, the final temperature of the gases, $T_f$ in terms of $T_0$ is :

asked Nov 13, 2018 by pady_1

0 answers

If a circcle passes through the point $(a, b)$ and cuts the circle $x^2 + y^2 = p^2$ orthogonally, then the equation of the locus of its centre is :

asked Nov 5, 2018 by pady_1

0 answers

A fully charged capacitor has a capacitance $C$. It is discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat capacity $s$ and mass $m$. If the temperature of the block is raised by $\Delta T$, the potential difference $V$ across the capacitance is :

asked Nov 5, 2018 by pady_1

0 answers

If the lines $2x +3y+1=0$ and $3x-y-4=0$ lie along diameters of a circle of circumference $10 \pi$, then the equation of the circle is

asked Nov 5, 2018 by pady_1

0 answers

The compound A on treatment with Na gives B, and with $PCl_4$ gives C, B and C react together to give diethyl ether. A, B and C are in the order

asked Aug 21, 2018 by pady_1

1 answer

The final proof for DNA as the genetic material came from the experiments of

asked Aug 21, 2018 by pady_1

1 answer

Which of the following is the most important cause of animals and plants being driven to extinction ?

asked Aug 21, 2018 by pady_1

1 answer

An association of individuals of different species living in the same habitat and having functional interactions is -

asked Aug 21, 2018 by pady_1

1 answer

Which of the following salts will give highest pH in water?

asked Aug 20, 2018 by pady_1

1 answer

At $25^oC$ molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is $9.54 \; ohm^{-1} cm^2 mol^{-1}$ and at infinite dilution its molar conductance is $238 \; ohm^{-1} cm^2 mol^{-1}$. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is -

asked Aug 20, 2018 by pady_1

1 answer

In a zero-order reaction for every 10° rise of temperature, the rate is doubled. If the temperature is increased from 10°C to 100°C, the rate of the reaction will become:

asked Aug 20, 2018 by pady_1

1 answer

The total number of atomic orbitals in fourth energy level of an atom is :

asked Aug 16, 2018 by pady_1

1 answer

For the reaction $N_2O_5(g)\to 2NO_2(g)+\frac12 O_2(g)$ the value of rate of disappearance of $N_2O_5$ is given as$6.25\times10^-3 mo lL^-1 S^-1$. The rate of formation of $NO_2$ and $O_2$ is given respectively as:

asked Jul 26, 2018 by pady_1

1 answer

10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be -

asked Jul 26, 2018 by pady_1

1 answer

Which one of the following arrangements does not give the correct picture of the trends indicated against it ?

asked Jul 26, 2018 by pady_1

1 answer

With which of the following electronic configuration of an atom has the lowest ionization enthalpy :

asked Jul 26, 2018 by pady_1

2 answers

Identify the correct statement for change of Gibbs energy for a system $(\Delta G_{system})$ at constant temperature and pressure:-

asked Jul 25, 2018 by pady_1

1 answer

Which one of the following is an inner orbital complex as well as diamagnetic in behaviour -

asked Jul 24, 2018 by pady_1

1 answer

Lanthanides are :-

asked Jul 24, 2018 by pady_1

1 answer

The ions $O^{2-} , F^-, Na^+, Mg^{2+}$ and $Al^{3+}$ are isoelecronic. Their ionic radii show :

asked Jul 24, 2018 by pady_1

1 answer

$_{92}U^{235}$, nucleus absorb a neutron and disintegrate in $_{54}Xe^{139}$, $_{38}Sr^{94}$ and x So, What will be the product x : -

asked Jul 23, 2018 by pady_1

1 answer

The correct acidic order of following is : -

asked Jul 20, 2018 by pady_1

1 answer

Increasing order of electrophilic substitution for following compounds :

asked Jul 20, 2018 by pady_1

1 answer

Correct order of –I effect is :

asked Jun 15, 2018 by pady_1

1 answer

Six friends A, B, C, D, E and F are sitting around a circular table. A is sitting between D and F, E is sitting between C and B. If D is sitting on right of B, who is sitting between A and B ?

asked Dec 31, 2015 by pady_1

1 answer

Of the people in Leah's office, 9 have been to Mississippi and 10 have been to Tennessee. 6 people have been to both Mississippi and Tennessee. How many people have been to Mississippi but not Tennessee?

asked Dec 31, 2015 by pady_1

0 answers

A pond is 50 m long, 30 m wide and 2 m deep. Find the capacity of the pond in cubic metre.

asked Dec 31, 2015 by pady_1

1 answer

$\large\frac{4}{7}$ of a number is 84. Find the number.

asked Dec 31, 2015 by pady_1

0 answers

(9\% of Rs.100) + (100\% of Rs.9) + Rs.9 = ?

asked Dec 31, 2015 by pady_1

0 answers

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