On moving a charge of 20 coulomb by 2 cm, 2 J of work is done, then what will be the potential difference between the points?

A and B are two concentric hollow conductors having radii a and 2a and charged 2Q and Q respectively.If potential of outer sphere is 5V then potential of inner sphere is?

0.2 g of a gas X occupies a volume of 0.44 litre at given pressure and temperature. Under identical conditions of P and T, 0.1 g of CO2 gas occupies 0.32 L volume. The gas X can be

One end of a thermally insulated rod is kept at a temperature *T _{1}* and the other at

*T*The rod is composed of two sections of lengths

_{2}.*l*and

_{1}*l*and thermal conductivities

_{2}*K*and

_{1}*K*respectively. What would be the temperature at the interface of the two sections?

_{2}-0

Assuming the sun to be a spherical body of radius *R* at a temperature of *TK*, evaluate the total radiant power, incident on earth, at a distance *r* from the sun.

Note: r_{0} is the radius of the earth and is Stefan's constant.

The figure shows a system of two concentric spheres of radii *r*_{1 }and *r _{2}* and kept at temperatures

*T*

_{1 }and

*T*respectively. The radial rate of flow of heat in a substance between the two concentric spheres is proportional to

_{2},

The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity *K* and *2K* and thickness *x* and *4x*, respectively are *T _{2 }* and

*T*

_{1 }(

*T*). The rate of heat transfer through the slab, in a steady state is , with equal to

_{2 }> T_{1}

Radiation of energy *E* falls normally on a perfectly reflecting surface. What is the momentum transferred to the surface?

If the temperature of the sun were to increase from *T* to *2T* and its radius from *R* to *2R*, then the ratio of the radiant energy received on earth to what it was previously will be

According to Newton's law of cooling, the rate of cooling of a body is proportional to where is the difference of the temperature of the body and the surroundings, and *n* is equal to

The earth radiates in the infrared region of the spectrum. The wavelength of the maximum intensity of the spectrum is correctly given by

Two spheres of the same material have radii 1 m and 4 m and temperatures 4000 K and 2000 K respectively. What is the ratio of the energy radiated per second by the first sphere to that by the second?

Which of the following is more close to a black body?

One end of a thermally insulated rod is kept at a temperature *T _{1}* and the other at

*T*The rod is composed of two sections of lengths

_{2}.*l*and

_{1}*l*and thermal conductivities

_{2}*K*and

_{1}*K*respectively. What would be the temperature at the interface of the two sections?

_{2}-0

The mature embryo sac of an angiosperm is 7-celled and 8-necleate structure.Explain this with appropriate diagram

How the production of progesterone gets increased in secretory phase?

At which phase of menstrual cycle does LH attain a peak level?state the main feature of the phase.

How porogamy differs from chalazogamy and mesogamy?

Draw a well leblled Plants L.S. of pistil showing pollen tube entering the embryo sac.

How monocarpic Plants differ from polycarpic plants?

WHat are the different types of syngamy on the basic of stricture of fusing gameters?

Coconut has both multicellular and free nuclear endosperm. Explain the types.

What is CuT? How is it effective among barrier methods?

how zoospores differ from conindia in lower group of organisms?

Pollen grains are well preserved as microfossils due to the presence of sporopollenin. Explain the Statement.

How does cortical reaction prevents the entry of additional sperms into ovum?

Sertoli cells secrete androgen binding protein and inhibin explain their functions.

Organisms produced through asexual reproduction have low adaptability to the changing environment.Justify the statement.

What is the function of suspensor cell in a dividing dicot embryo?

How ZIFT is different from IUT?

What is the name of the space that appears between epiblast and trophoblast in a developing human embryo?

How does dicliny differs from prepotency as two outbreeding contrivances?

The Chance of survival among young ones of viviparous animals are more than those of oviparous animals, why?

Name an Organism showing oblique binary fission.

For an elementary reaction

If C_{P} and C_{v }denote the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively, then

A Carnot engine, having an efficiency of *n* = 1/10 as a heat engine, is used as a refrigerator. If the work done on the system is 10 J, what will be the amount of energy absorbed from the reservoir at a lower temperature?

When a system is taken from state *i* to state *f* along the path *iaf*, it is found that *Q* = 50 cal and *W* = 20 cal. Along the path *ibf* *Q* = 36 cal. *W* along the path *ibf* is

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*. 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, what will be the final temperature of the gases,

_{0}*T*, in terms of

_{f}*T*?

_{0}

The work of 146 kJ is performed in order to compress one kilo mole of gas adiabatically and in this process the temperature of the gas increases by 7ºC. The gas is (R = 8.3 J mol^{-1} K^{-1})

A gaseous mixture consists of 16 g of helium and 16 g of oxygen. What is the ratio C_{p} / C_{v} Vof the mixture?

A system goes from *A* to *B* via two processes I and II as shown in the below figure. If and are the changes in internal energies in the processes I and II respectively, then

The temperature entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is

Which of the following is incorrect regarding the first law of thermodynamics?

Two thermally insulated vessels 1 and 2 are filled with air at temperatures *(T _{1}, T_{2} )*, volume

*(V*, and pressure

_{1}, V_{2})*(P*, respectively. If the valve joining the two vessels is opened, the temperature inside the vessel at equilibrium will be

_{1}, P_{2})

Which of the following statements is correct for any thermodynamic system?

Which of the following statements is correct for any thermodynamic system?

Which of the following statements is correct for any thermodynamic system?

One mole of ideal monoatomic gas is mixed with one mole of diatomic gas . What is for the mixture?

Note: denotes the ratio of specific heat at constant pressure, to that at constant volume.

A Carnot engine takes 3 × 10^{6 }cal of heat from a reservoir at 627°C, and gives it to a sink at 27°C. What is the work done by the engine?