Physics-
General
Easy

Question

Which oft he following statements is/are false about mode of heat transfer?

  1. In radiation, heat is transfer edf rom one medium to another with out affecting the interveningmedium    
  2. Radiation and convection are possible in vaccum whileconductionrequiresmaterialmedium.    
  3. Conductiois possiblin solids while convection occurs in liquidand gases.    
  4. All are correct    

The correct answer is: Radiation and convection are possible in vaccum whileconductionrequiresmaterialmedium.

Related Questions to study

General
Physics-

if light with wavelength 0.50 µ m falls on a slit of width 10 µ m and at an angle theta = 300 to its normal. Then angular position of first minima located on right sides of the central Fraunh offer’s diffraction will be at

if light with wavelength 0.50 µ m falls on a slit of width 10 µ m and at an angle theta = 300 to its normal. Then angular position of first minima located on right sides of the central Fraunh offer’s diffraction will be at

Physics-General
General
Physics-

100 cm3 of water is compressed from 0.5 atmosphere pressure The work done is x. The work done in compressing 100 cm3 of air from 0.5 atmosphere to 5 atmosphere is y. Then:

100 cm3 of water is compressed from 0.5 atmosphere pressure The work done is x. The work done in compressing 100 cm3 of air from 0.5 atmosphere to 5 atmosphere is y. Then:

Physics-General
General
Physics-

A ball is thrown vertically upwards in free space. Its total mechanical energy .

A ball is thrown vertically upwards in free space. Its total mechanical energy .

Physics-General
parallel
General
Physics-

A stone of mass m is moved in a circle of radius r with constant speed υ. The work done by the force over half the circumference of the circle is

A stone of mass m is moved in a circle of radius r with constant speed υ. The work done by the force over half the circumference of the circle is

Physics-General
General
Physics-

The energy distribution E with the wavelength left parenthesis lambda right parenthesis for the black body radiation at temperature T   K e l v i nis shown in the figure. As the temperature is increased the maxima will

The energy distribution E with the wavelength left parenthesis lambda right parenthesis for the black body radiation at temperature T   K e l v i nis shown in the figure. As the temperature is increased the maxima will

Physics-General
General
Physics-

The spectrum of a black body at two temperatures 27oC and 327oC is shown in the figure. Let A1 and A2 be the areas under the two curves respectively. The value of fraction numerator A subscript 2 end subscript over denominator A subscript 1 end subscript end fraction is

The spectrum of a black body at two temperatures 27oC and 327oC is shown in the figure. Let A1 and A2 be the areas under the two curves respectively. The value of fraction numerator A subscript 2 end subscript over denominator A subscript 1 end subscript end fraction is

Physics-General
parallel
General
Physics-

A body cools in a surrounding which is at a constant temperature of theta subscript 0 end subscript. Assume that it obeys Newton's law of cooling. Its temperature theta is plotted against time t. Tangents are drawn to the curve at the points P left parenthesis theta equals theta subscript 1 end subscript right parenthesis and Q left parenthesis theta equals theta subscript 2 end subscript right parenthesis. These tangents meet the time axis at angles of phi subscript 2 end subscriptand phi subscript 1 end subscript, as shown

A body cools in a surrounding which is at a constant temperature of theta subscript 0 end subscript. Assume that it obeys Newton's law of cooling. Its temperature theta is plotted against time t. Tangents are drawn to the curve at the points P left parenthesis theta equals theta subscript 1 end subscript right parenthesis and Q left parenthesis theta equals theta subscript 2 end subscript right parenthesis. These tangents meet the time axis at angles of phi subscript 2 end subscriptand phi subscript 1 end subscript, as shown

Physics-General
General
Physics-

Variation of radiant energy emitted by sun, filament of tungsten lamp and welding arc as a function of its wavelength is shown in figure. Which of the following option is the correct match

Variation of radiant energy emitted by sun, filament of tungsten lamp and welding arc as a function of its wavelength is shown in figure. Which of the following option is the correct match

Physics-General
General
Physics-

The adjoining diagram shows the spectral energy density distribution E subscript lambda end subscriptof a black body at two different temperatures. If the areas under the curves are in the ratio 16 : 1, the value of temperature T is

The adjoining diagram shows the spectral energy density distribution E subscript lambda end subscriptof a black body at two different temperatures. If the areas under the curves are in the ratio 16 : 1, the value of temperature T is

Physics-General
parallel
General
Physics-

The plots of intensity versus wavelength for three black bodies at temperatures T1, T2 and T3 respectively are as shown. Their temperature are such that

The plots of intensity versus wavelength for three black bodies at temperatures T1, T2 and T3 respectively are as shown. Their temperature are such that

Physics-General
General
Physics-

The graph. Shown in the adjacent diagram, represents the variation of temperature (T) of two bodies, x and y having same surface area, with time (t) due to the emission of radiation. Find the correct relation between the emissivity (e) and absorptivity (a) of the two bodies

The graph. Shown in the adjacent diagram, represents the variation of temperature (T) of two bodies, x and y having same surface area, with time (t) due to the emission of radiation. Find the correct relation between the emissivity (e) and absorptivity (a) of the two bodies

Physics-General
General
Physics-

The figure shows a system of two concentric spheres of radii r1 and r2 and kept at temperatures T1 and T2, respectively. The radial rate of flow of heat in a substance between the two concentric spheres is proportional to

The figure shows a system of two concentric spheres of radii r1 and r2 and kept at temperatures T1 and T2, respectively. The radial rate of flow of heat in a substance between the two concentric spheres is proportional to

Physics-General
parallel
General
Physics-

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 T2 and T1 (T2 > T1). The rate of heat transfer through the slab, in a steady state is open parentheses fraction numerator A left parenthesis T subscript 2 end subscript minus T subscript 1 end subscript right parenthesis K over denominator x end fraction close parentheses f, with ¦ which equal to

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 T2 and T1 (T2 > T1). The rate of heat transfer through the slab, in a steady state is open parentheses fraction numerator A left parenthesis T subscript 2 end subscript minus T subscript 1 end subscript right parenthesis K over denominator x end fraction close parentheses f, with ¦ which equal to

Physics-General
General
Physics-

One end of a copper rod of uniform cross-section and of length 3.1 m is kept in contact with ice and the other end with water at 100°C. At what point along it's length should a temperature of 200°C be maintained so that in steady state, the mass of ice melting be equal to that of the steam produced in the same interval of time. Assume that the whole system is insulated from the surroundings. Latent heat of fusion of ice and vaporisation of water are 80 cal/gm and 540 cal/gm respectively

One end of a copper rod of uniform cross-section and of length 3.1 m is kept in contact with ice and the other end with water at 100°C. At what point along it's length should a temperature of 200°C be maintained so that in steady state, the mass of ice melting be equal to that of the steam produced in the same interval of time. Assume that the whole system is insulated from the surroundings. Latent heat of fusion of ice and vaporisation of water are 80 cal/gm and 540 cal/gm respectively

Physics-General
General
Physics-

Five rods of same dimensions are arranged as shown in the figure. They have thermal conductivities K1, K2, K3, K4 and K5. When points A and B are maintained at different temperatures, no heat flows through the central rod if

Five rods of same dimensions are arranged as shown in the figure. They have thermal conductivities K1, K2, K3, K4 and K5. When points A and B are maintained at different temperatures, no heat flows through the central rod if

Physics-General
parallel

card img

With Turito Academy.

card img

With Turito Foundation.

card img

Get an Expert Advice From Turito.

Turito Academy

card img

With Turito Academy.

Test Prep

card img

With Turito Foundation.