Recent questions tagged 17

The most suitable reagent for the following conversion is :-

asked Jul 10, 2019 by pady_1

1 answer

The Poisson's ratio $\sigma$ should satisfy the relation :

asked Dec 19, 2018 by pady_1

0 answers

Taking that earth revolves round the sun in a circular orbit of radius $15 \times 10^{10}m$, with a time period of 1 year the time taken by another planet, which is at a distance of $540 \times 10^{10}m$, to revolve round the sun in circular orbit once, will be :

asked Dec 19, 2018 by pady_1

1 answer

The ratio of the longest and shortest wave-lengths in Bracket series of hydrogen spectra is :

asked Dec 19, 2018 by pady_1

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The pressure and density of a diatomic gas $(\gamma = \frac{7}{5} )$ changes adiabatically from $(P, d)$ to $(P', d')$. If $\frac{d'}{d} =32$. Then $\frac{P'}{P}$ is :

asked Dec 11, 2018 by pady_1

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If a spring has time period T, and is cut into $n$equal parts, then the time period of each part will be :

asked Dec 11, 2018 by pady_1

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Which of the following radiations has the least wavelength ?

asked Dec 11, 2018 by pady_1

0 answers

In a potentiometer experiment, it is found that no current passes through the galvanometer when the terminals of the cell are connected across 52 cm of the potentiometer wire. If the cell is shunted by resistance of $5 \Omega$, a balance is found when the cell is connected across 40 cm of the wire. Find the internal resistance of the cell.

asked Dec 11, 2018 by pady_1

0 answers

The eccentriciy of an ellipse whose centre is at the origin is $\frac{1}{2}$. If one of its directrices is $x = -4$, then the equation of the normal to it at $(1, \frac{3}{2})$ is

asked Dec 11, 2018 by pady_1

1 answer

An arc lamp requires a direct current of 10 A at 80 V to function. If it is connected to a 220 V (rms), 50 Hz AC supply, the series inductor needed for it to work is close to :

asked Dec 11, 2018 by pady_1

0 answers

Suppose the drift velocity $v_{_d}$ in a material varied with the applied electric field $E$ as $v_{_d} \propto \sqrt{E}$ ; . Then $V - I$ graph for a wire made of such a material is best given by :

asked Dec 11, 2018 by pady_1

0 answers

One mole of diatomic ideal gas undergoes a cyclic process ABC as shown in figure. The process BC is adiabatic. The temperatures at A, B and C are 400 K, 800 K and 600 K respectively. Choose the correct statement:

asked Dec 11, 2018 by pady_1

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Synthesis of each molecule of glucose in photosynthesis involves :

asked Dec 11, 2018 by pady_1

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The area bounded between the parabolas $x^2 = \frac{y}{4}$ and $x^2= 9y$ and the straight line $y = 2$ is

asked Dec 11, 2018 by pady_1

0 answers

This question has Statement-1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements. Statement-1 : Sky wave signals are used for long distance radio communication. These signals are in general, less stable than ground wave signals. Statement-2: The state of ionosphere varies from hour to hour, day to day and season to season

asked Dec 11, 2018 by pady_1

0 answers

Three reactions involving $H_2 PO_4^{-}$ are given below :$(i)H_3PO_4+H_2O \to H_3O^{+} +H_2PO_4^{-} \qquad (ii) H_2PO_4^{-}+H_2O \to HPO_4^{2-}+H_3O^{+} \qquad (iii)H_2PO_4^{-}+OH^{-} \to H_3PO_4+O^{2-}$ In which of the above does $H_2PO_4^{-}$ act as an acid ?

asked Dec 11, 2018 by pady_1

0 answers

A particle has an initial velocity $3 \hat{i} + 4 \hat{j}$ and an acceleration of $0.4 \hat{i} + 0.3 \hat{j}$. Its speed after 10 s is

asked Nov 29, 2018 by pady_1

1 answer

Statement - 1: For every natural number $n\geq 2$ ,$\frac{1}{\sqrt{1}}+\frac{1}{\sqrt{2}}+$........$+\frac{1}{\sqrt{n}}>\sqrt{n}$ Statement -2: For every natural number $n\geq 2$ $\sqrt{{n}({n+1})}$

asked Nov 29, 2018 by pady_1

0 answers

Two aeroplanes I and II bomb a target in succession. The probabilities of I and II scoring a hit correctly are 0.3 and 0.2, respectively. The second plane will bomb only if the first misses the target. The probability that the target is hit by the second plane is :

asked Nov 29, 2018 by pady_1

1 answer

Consider a two particle system with particles having masses $m_1$ and $m_2$. If the first particle is pushed towards the centre of mass through a distance d, by what distance should the second particle be moved, so as to keep the centre of mass at the same position ?

asked Nov 13, 2018 by pady_1

0 answers

Let $ f : (-1, 1) \to B$ be a function defined by$f(x) = \tan^{-1} \frac{2x}{1-x^2}$, then $f$ is both one-one and onto when $B$ is the interval :

asked Nov 5, 2018 by pady_1

0 answers

A mass m moves with a velocity $\nu$ and collides inelastically with another identical mass. After collision the $I^{st}$ mass moves with velocity $\frac{\nu}{\sqrt{3}}$ in a direction perpendicular to the initial direction of motion. Find the speed of the second mass after collision :

asked Nov 5, 2018 by pady_1

0 answers

If $S_n =\displaystyle\sum_{r=0}^{n} \frac{1}{^nC_r}$ and $t_n= \displaystyle\sum_{r=0}^{n} \frac{r}{^nC_r}$, then $\frac{t_n}{S_n}$ is equal to

asked Nov 5, 2018 by pady_1

0 answers

In a p-n junction diode, change in temperature due to heating

asked Aug 21, 2018 by pady_1

1 answer

Mixture of chloroxylenol and terpineol acts as :

asked Aug 21, 2018 by pady_1

1 answer

Which is the correct statement for the given acids ?

asked Aug 21, 2018 by pady_1

1 answer

The vacant space in bcc lattice unit cell is :

asked Aug 21, 2018 by pady_1

1 answer

A mono atomic gas at a pressure P, having a volume V expands isothermally to a volume 2V and then adiabatically to a volume 16V. The final pressure of the gas is : (take $\gamma = 5/3$)

asked Aug 20, 2018 by pady_1

1 answer

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of $\frac{C_p}{C_v}$ for the gas is -

asked Aug 20, 2018 by pady_1

1 answer

One mole of an ideal gas goes from an initial state A to final state B via two processes : It firs undergoes isothermal expansion from volume V to 3V and then its volume is reduced from 3toVat constant pressure. The correct P-V diagram representing the two processes is:

asked Aug 20, 2018 by pady_1

1 answer

A parallel plate condenser have a uniform electric field $E(V/m)$ in the space between the plates. If the distance between the plates is $d(m)$ and area of each plate is $A(m^2)$ the energy (joules) stored in the condenser is :

asked Aug 16, 2018 by pady_1

1 answer

Which one of the following bonds produces a n solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has high melting point ?

asked Jul 26, 2018 by pady_1

1 answer

A black body at $227^{\circ}C$ radiates heat at the rate of $7cals/cm^{2}s$. At a temperature of $727^{\circ}C$, the rate of heat radiated in the same units will be :

asked Jul 26, 2018 by pady_1

1 answer

A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly :

asked Jul 26, 2018 by pady_1

1 answer

The frequency of a light wave in a material is $2 \times 10^{14}$ Hz and wavelength is $5000$ Å. The refractive index of material will be:-

asked Jul 26, 2018 by pady_1

1 answer

The velocity v of a particle at time t is given by $V=at+\frac{b}{t+c}$, where a, b and c are constants. t + c The dimensions of a, b and c are respectively:-

asked Jul 25, 2018 by pady_1

1 answer

The ratio of the dimension of Planck's constant and that of the moment of inertia is the dimension of :

asked Jul 24, 2018 by pady_1

2 answers

A mass of 0.5 kg moving with a speed of 1.5 m/s on a horizontal smooth surface, collides with a nearly weightless spring of force constant k = 50 N/m. The maximum compression of the spring would be :-

asked Jul 24, 2018 by pady_1

1 answer

A particle of mass m oscillates with simple harmonic motion between points $x_1$ and $x_2$, the equilibrium position being O. Its potential energy is plotted. It will be as given below in the graph :

asked Jul 24, 2018 by pady_1

1 answer

Which of the following is best close to an ideal black body : -

asked Jul 23, 2018 by pady_1

2 answers

A cricketer catches a ball of mass 150 gm in 0.1 second moving with speed $20 ms^{-1}$. Then he experiences force of :-

asked Jul 20, 2018 by pady_1

1 answer

To find out degree of freedom, the correct expression is :

asked Jul 20, 2018 by pady_1

1 answer

A small ball is suspended from a thread. It is lifted up with an acceleration $4.9 ms^{–2}$ and lowered with an acceleration $4.9 ms^{–2}$ then the ratio of tensions in the thread in both cases will be :

asked Jun 15, 2018 by pady_1

0 answers

Pick the odd one out TITAN, MERCURY, EARTH, JUPITER

asked Dec 31, 2015 by pady_1

1 answer

The chart shows production of different vegetables in a farm. If production of onion was 13500 Kg, find the production of cauliflower.

asked Dec 31, 2015 by pady_1

0 answers

Find the area of a rectangular field whose length is 100 m and breadth is 76 m.

asked Dec 31, 2015 by pady_1

0 answers

Find the Product $5 \large\frac{1}{3} \times \large\frac{2}{5}$

asked Dec 31, 2015 by pady_1

0 answers

There were 3125 students in a school last year. This year 167 students joined kindergarden and 366 students passed out and joined college. Also, 382 students transferred out to other schools, and 319 students transferred in from other schools. How many students are there in the school now?

asked Dec 31, 2015 by pady_1

0 answers

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