Physics-
General
Easy

Question

A solid material is supplied with heat at constant rate and the temperature of the material changes as shown. From the graph, the false conclusion drawn is

  1. A B and C D of the graph represent phase changes    
  2. A B represents the change of state from solid to liquid    
  3. Latent heat of fusion is twice the latent heat of vaporization    
  4. C D represents change of state from liquid to vapour    

The correct answer is: Latent heat of fusion is twice the latent heat of vaporization

Related Questions to study

General
physics-

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

According to Wien’s displacement law lambda subscript m end subscript proportional to fraction numerator 1 over denominator T end fraction. Hence, it temperature increases lambda subscript m end subscript decreases i. e. comma peak of the E minus lambda curve shift towards left

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

physics-General
According to Wien’s displacement law lambda subscript m end subscript proportional to fraction numerator 1 over denominator T end fraction. Hence, it temperature increases lambda subscript m end subscript decreases i. e. comma peak of the E minus lambda curve shift towards left
General
physics-

A metal rod of length 2 m has cross sectional areas 2 A and A as shown in figure. The ends are maintained at temperatures 100 ℃ and 70 ℃. The temperature at middle point C is

Let theta be temperature of middle point C and in series rate of heat flow is same
rightwards double arrow K open parentheses 2 A close parentheses open parentheses 100 minus theta close parentheses equals K A left parenthesis theta minus 70 right parenthesis
rightwards double arrow 200 minus 2 theta equals theta minus 70 rightwards double arrow 3 theta equals 270 rightwards double arrow theta equals 90 ℃

A metal rod of length 2 m has cross sectional areas 2 A and A as shown in figure. The ends are maintained at temperatures 100 ℃ and 70 ℃. The temperature at middle point C is

physics-General
Let theta be temperature of middle point C and in series rate of heat flow is same
rightwards double arrow K open parentheses 2 A close parentheses open parentheses 100 minus theta close parentheses equals K A left parenthesis theta minus 70 right parenthesis
rightwards double arrow 200 minus 2 theta equals theta minus 70 rightwards double arrow 3 theta equals 270 rightwards double arrow theta equals 90 ℃
General
physics-

The coefficient of thermal conductivity of copper is nine times that of steel. In the composite cylindrical bar show in figure, what will be the temperature at the junction of copper ad steel?

Let the temperature of junction be theta.
open parentheses fraction numerator increment Q over denominator d subscript 1 end subscript end fraction close parentheses subscript c o p p e r end subscript blank equals open parentheses fraction numerator increment Q over denominator increment T end fraction close parentheses subscript s t e e l end subscript
K subscript 1 end subscript A equals blank fraction numerator open parentheses 100 minus theta close parentheses over denominator 18 end fraction equals fraction numerator K subscript 2 end subscript A open parentheses theta minus 0 close parentheses over denominator 6 end fraction
9 K subscript 2 end subscript fraction numerator open parentheses 100 minus theta close parentheses over denominator 3 end fraction equals K subscript 2 end subscript theta
3theta equals 900 minus 9 theta
12theta equals 900
theta equals 75 ℃

The coefficient of thermal conductivity of copper is nine times that of steel. In the composite cylindrical bar show in figure, what will be the temperature at the junction of copper ad steel?

physics-General
Let the temperature of junction be theta.
open parentheses fraction numerator increment Q over denominator d subscript 1 end subscript end fraction close parentheses subscript c o p p e r end subscript blank equals open parentheses fraction numerator increment Q over denominator increment T end fraction close parentheses subscript s t e e l end subscript
K subscript 1 end subscript A equals blank fraction numerator open parentheses 100 minus theta close parentheses over denominator 18 end fraction equals fraction numerator K subscript 2 end subscript A open parentheses theta minus 0 close parentheses over denominator 6 end fraction
9 K subscript 2 end subscript fraction numerator open parentheses 100 minus theta close parentheses over denominator 3 end fraction equals K subscript 2 end subscript theta
3theta equals 900 minus 9 theta
12theta equals 900
theta equals 75 ℃
parallel
General
Maths-

Which function is shown in graph?

Which function is shown in graph?

Maths-General
General
Maths-

Which function is shown in graph?

Which function is shown in graph?

Maths-General
General
Maths-

Which function is shown in graph?

Which function is shown in graph?

Maths-General
parallel
General
physics-

Five rods of same dimensions are arranged as shown in figure. They have thermal conductivities K subscript 1 end subscript comma blank K subscript 2 end subscript comma blank K subscript 3 end subscript comma blank K subscript 4 end subscript a n d K subscript 5 end subscript. When points A blank a n d blank B are maintained at different temperature, no heat would flow through central rod, if

The equivalent electrical circuit, figure in these cases is of Wheatstone bridge. No current would flow through central rod C D when the bridge is balanced. The condition for balanced Wheatstone bridge is fraction numerator P over denominator Q end fraction equals fraction numerator R over denominator S end fraction (in terms of resistances)
fraction numerator 1 divided by K subscript 1 end subscript over denominator 1. K subscript 2 end subscript end fraction equals fraction numerator 1 divided by K subscript 3 end subscript over denominator 1 divided by K subscript 4 end subscript end fraction or fraction numerator K subscript 2 end subscript over denominator K subscript 1 end subscript end fraction equals fraction numerator K subscript 4 end subscript over denominator K subscript 3 end subscript end fraction
Or K subscript 1 end subscript K subscript 4 end subscript equals K subscript 2 end subscript K subscript 3 end subscript

Five rods of same dimensions are arranged as shown in figure. They have thermal conductivities K subscript 1 end subscript comma blank K subscript 2 end subscript comma blank K subscript 3 end subscript comma blank K subscript 4 end subscript a n d K subscript 5 end subscript. When points A blank a n d blank B are maintained at different temperature, no heat would flow through central rod, if

physics-General
The equivalent electrical circuit, figure in these cases is of Wheatstone bridge. No current would flow through central rod C D when the bridge is balanced. The condition for balanced Wheatstone bridge is fraction numerator P over denominator Q end fraction equals fraction numerator R over denominator S end fraction (in terms of resistances)
fraction numerator 1 divided by K subscript 1 end subscript over denominator 1. K subscript 2 end subscript end fraction equals fraction numerator 1 divided by K subscript 3 end subscript over denominator 1 divided by K subscript 4 end subscript end fraction or fraction numerator K subscript 2 end subscript over denominator K subscript 1 end subscript end fraction equals fraction numerator K subscript 4 end subscript over denominator K subscript 3 end subscript end fraction
Or K subscript 1 end subscript K subscript 4 end subscript equals K subscript 2 end subscript K subscript 3 end subscript
General
physics-

If two metallic plates of equal thicknesses and thermal conductivities K subscript 1 end subscript and K subscript 2 end subscript are put together face to face and a common plate is constructed, then the equivalent thermal conductivity of this plate will be

In series, R subscript e q end subscript equals R subscript 1 end subscript plus R subscript 2 end subscript rightwards double arrow fraction numerator 2 l over denominator K subscript e q end subscript A end fraction equals fraction numerator l over denominator K subscript 1 end subscript A end fraction plus fraction numerator l over denominator K subscript 2 end subscript A end fraction
rightwards double arrow fraction numerator 2 over denominator K subscript e q end subscript end fraction equals fraction numerator 1 over denominator K subscript 1 end subscript end fraction plus fraction numerator 1 over denominator K subscript 2 end subscript end fraction rightwards double arrow K subscript e q end subscript equals fraction numerator 2 K subscript 1 end subscript K subscript 2 end subscript over denominator K subscript 1 end subscript plus K subscript 2 end subscript end fraction

If two metallic plates of equal thicknesses and thermal conductivities K subscript 1 end subscript and K subscript 2 end subscript are put together face to face and a common plate is constructed, then the equivalent thermal conductivity of this plate will be

physics-General
In series, R subscript e q end subscript equals R subscript 1 end subscript plus R subscript 2 end subscript rightwards double arrow fraction numerator 2 l over denominator K subscript e q end subscript A end fraction equals fraction numerator l over denominator K subscript 1 end subscript A end fraction plus fraction numerator l over denominator K subscript 2 end subscript A end fraction
rightwards double arrow fraction numerator 2 over denominator K subscript e q end subscript end fraction equals fraction numerator 1 over denominator K subscript 1 end subscript end fraction plus fraction numerator 1 over denominator K subscript 2 end subscript end fraction rightwards double arrow K subscript e q end subscript equals fraction numerator 2 K subscript 1 end subscript K subscript 2 end subscript over denominator K subscript 1 end subscript plus K subscript 2 end subscript end fraction
General
physics-

The graph, shown in the adjacent diagram, represents the variation of temperature left parenthesis T right parenthesis 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 and absorptivity power of the two bodies.

Rate of cooling left parenthesis negative fraction numerator d T over denominator d t end fraction right parenthesis proportional to emissivity(e)
From the graph,
open parentheses negative fraction numerator d T over denominator d t end fraction close parentheses subscript x end subscript greater than open parentheses negative fraction numerator d T over denominator d t end fraction close parentheses subscript y end subscript
therefore e subscript x end subscript greater than e subscript y end subscript
Further emissivity (e)proportional to absorptive power (a) (good absorbers are good emitters also)
therefore a subscript x end subscript greater than a subscript y end subscript

The graph, shown in the adjacent diagram, represents the variation of temperature left parenthesis T right parenthesis 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 and absorptivity power of the two bodies.

physics-General
Rate of cooling left parenthesis negative fraction numerator d T over denominator d t end fraction right parenthesis proportional to emissivity(e)
From the graph,
open parentheses negative fraction numerator d T over denominator d t end fraction close parentheses subscript x end subscript greater than open parentheses negative fraction numerator d T over denominator d t end fraction close parentheses subscript y end subscript
therefore e subscript x end subscript greater than e subscript y end subscript
Further emissivity (e)proportional to absorptive power (a) (good absorbers are good emitters also)
therefore a subscript x end subscript greater than a subscript y end subscript
parallel
General
maths-

s i n space A plus s i n space 3 A plus s i n space 5 A plus s i n space 7 A equals

Apply SinC+SinD formula

s i n space A plus s i n space 3 A plus s i n space 5 A plus s i n space 7 A equals

maths-General
Apply SinC+SinD formula
General
maths-

Value of s i n to the power of 6 space 7 1 half to the power of ring operator plus c o s to the power of 6 space 7 1 half is

s i n to the power of 6 end exponent invisible function application theta plus c o s to the power of 6 end exponent invisible function application theta equals 1 minus fraction numerator 3 over denominator 4 end fraction s i n to the power of 2 end exponent invisible function application 2 theta comma text  put  end text theta equals 7 fraction numerator 1 over denominator 2 end fraction

Value of s i n to the power of 6 space 7 1 half to the power of ring operator plus c o s to the power of 6 space 7 1 half is

maths-General
s i n to the power of 6 end exponent invisible function application theta plus c o s to the power of 6 end exponent invisible function application theta equals 1 minus fraction numerator 3 over denominator 4 end fraction s i n to the power of 2 end exponent invisible function application 2 theta comma text  put  end text theta equals 7 fraction numerator 1 over denominator 2 end fraction
General
Maths-

What is A union B for two mutually exclusive sets A and B?

What is A union B for two mutually exclusive sets A and B?

Maths-General
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General
Maths-

Which of the following is set representing neither A nor B?

Which of the following is set representing neither A nor B?

Maths-General
General
Maths-

Which of the following is set representing B but not A?

Which of the following is set representing B but not A?

Maths-General
General
Maths-

Which of the following is set representing A but not B?

Which of the following is set representing A but not B?

Maths-General
parallel

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