Maths-
If 
and theperiod of 
is 
, then 
Maths-General
- 2
- 4
- 1
- 3
Answer:The correct answer is: 2
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physics-
The adjoining diagram shows the spectral energy density distribution 
of a black body at two different temperatures. If the areas under the curves are in the ratio 16 : 1, the value of temperature 
is
[Given]Area under
curve represents the emissive power of body and emissive power 
The adjoining diagram shows the spectral energy density distribution of a black body at two different temperatures. If the areas under the curves are in the ratio 16 : 1, the value of temperature is
physics-General
[Given]Area under
curve represents the emissive power of body and emissive power physics-
Five identical rods are joined as shown in figure. Point 
and 
are maintained at temperature 
and 
respectively. The temperature of junction 
will be
If thermal resistance of each rod is considered 
then, the given combination can be redrawn as follows
then, the given combination can be redrawn as followsFive identical rods are joined as shown in figure. Point and are maintained at temperature and respectively. The temperature of junction will be
physics-General
If thermal resistance of each rod is considered then, the given combination can be redrawn as follows
then, the given combination can be redrawn as followsphysics-
One end of a thermally insulated rod is kept at a temperature 
and other at 
. The rod is composed of two sections of lengths 
and 
and thermal conductivities 
and 
respectively. The temperature at the interface of the two sections is
Let temperature at the interface is T.
For part AB,
For part
At equilibrium,
For part AB,
For part
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One end of a thermally insulated rod is kept at a temperature and other at . The rod is composed of two sections of lengths and and thermal conductivities and respectively. The temperature at the interface of the two sections is
physics-General
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For part AB,
For part
At equilibrium,
For part AB,
For part
At equilibrium,
physics-
The figure given below shows the cooling curve of pure wax material after heating. It cools from to and solidifies along 
If 
and are respective values of latent heat and the specific heat of the liquid wax, the ratio 
is
Let the quantity of heat supplied per minute be 
Then quantity of heat supplied in 
In
heat supplied 
Then quantity of heat supplied in In
heat supplied The figure given below shows the cooling curve of pure wax material after heating. It cools from to and solidifies along If and are respective values of latent heat and the specific heat of the liquid wax, the ratio is
physics-General
Let the quantity of heat supplied per minute be Then quantity of heat supplied in
Inheat supplied
Then quantity of heat supplied in In
heat supplied maths-
If 
, then 
_______________
If , then _______________
maths-General
physics-
Which one of the following is 
graph for perfectly black body? 
is the frequency of radiation with maximum intensity, is the absolute temperature.
Intensity is directly proportional to energy.
Which one of the following is graph for perfectly black body? is the frequency of radiation with maximum intensity, is the absolute temperature.
physics-General
Intensity is directly proportional to energy.
physics-
The graph signifies
The graph signifies
physics-General
physics-
Which curve shows the rise of temperature with the amount of heat supplied, for a piece of ice?
Initially on heating temperature rises from 
(200K) to 0
(273K). Then ice melts and temperature does not rise. After the whole ice has melted, temperature begins to rise until it reaches 100
(373K). Then it becomes constant and after that it changes to vapours.
(200K) to 0(273K). Then ice melts and temperature does not rise. After the whole ice has melted, temperature begins to rise until it reaches 100 (373K). Then it becomes constant and after that it changes to vapours.Which curve shows the rise of temperature with the amount of heat supplied, for a piece of ice?
physics-General
Initially on heating temperature rises from (200K) to 0(273K). Then ice melts and temperature does not rise. After the whole ice has melted, temperature begins to rise until it reaches 100 (373K). Then it becomes constant and after that it changes to vapours.
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Three rods made of same material and having same cross-section are joined as shown in the figure. Each rod is of same length. The temperature at the junction of the three rods is
Let the temperature of function be 
, then
Or
Or
Or
Or
, thenOr
Or
Or
Or
Three rods made of same material and having same cross-section are joined as shown in the figure. Each rod is of same length. The temperature at the junction of the three rods is
physics-General
Let the temperature of function be , then
Or
Or
Or
Or
, thenOr
Or
Or
Or
physics-
The figure shows a glass tube (linear co-efficient of expansion is 
) completely filled with a liquid of volume expansion co-efficient 
On heating length of the liquid column does not change. Choose the correct relation between 
and
When length of the liquid column remains constant, then the level of liquid moves down with respect to the container, thus must be less than 
Now we can write
Since
Hence
must be less than Now we can write
Since
Hence
The figure shows a glass tube (linear co-efficient of expansion is ) completely filled with a liquid of volume expansion co-efficient On heating length of the liquid column does not change. Choose the correct relation between and
physics-General
When length of the liquid column remains constant, then the level of liquid moves down with respect to the container, thus must be less than
Now we can write
Since
Hence
must be less than Now we can write
Since
Hence
physics-
The spectrum of a black body at two temperatures 
and 
is shown in the figure. Let 
and 
be the areas under the two curves respectively. The value of 
is
Area under given curve represents emissive power and emissive power 
The spectrum of a black body at two temperatures and is shown in the figure. Let and be the areas under the two curves respectively. The value of is
physics-General
Area under given curve represents emissive power and emissive power
physics-
In a vertical U-tube containing a liquid, the two arms are maintained at different temperatures 
and 
The liquid columns in the two arms have heights and respectively. The coefficient of volume expansion of the liquid is equal to
Suppose, height of liquid in each arm before rising the temperature is 
.
With temperature rise height of liquid in each arm increases
Also
.With temperature rise height of liquid in each arm increases
Also
In a vertical U-tube containing a liquid, the two arms are maintained at different temperatures and The liquid columns in the two arms have heights and respectively. The coefficient of volume expansion of the liquid is equal to
physics-General
Suppose, height of liquid in each arm before rising the temperature is .
With temperature rise height of liquid in each arm increases
Also
.With temperature rise height of liquid in each arm increases
Also
physics-
Six identical metallic rods are joined together in a pattern as shown in the figure. Points A and D are maintained at temperature 
and 
. The temperature of the junction will be
(i)
(ii)Solving (i) and (ii)
Six identical metallic rods are joined together in a pattern as shown in the figure. Points A and D are maintained at temperature and . The temperature of the junction will be
physics-General
(i)(ii)Solving (i) and (ii)
physics-
A bimetallic strip consists of metals 
and 
. It is mounted rigidly at the base as shown. The metal has a higher coefficient of expansion compared to that for metal . when bimetallic strip is placed in a cold bath
The metal X has a higher coefficient of expansion compared to that for metal Y so, on placing bimetallic strip in a cold bath, X will shrink more than . Hence, the strip will bend towards the left.
. Hence, the strip will bend towards the left.A bimetallic strip consists of metals and . It is mounted rigidly at the base as shown. The metal has a higher coefficient of expansion compared to that for metal . when bimetallic strip is placed in a cold bath
physics-General
The metal X has a higher coefficient of expansion compared to that for metal Y so, on placing bimetallic strip in a cold bath, X will shrink more than . Hence, the strip will bend towards the left.
. Hence, the strip will bend towards the left.physics-
The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity 
and 2 and thickness 
and 4, respectively are and 
. The rate of heat transfer through the slab, in a steady state is 
, with 
equals to
Let the temperature of common interface be 
. Rate of heat flow
=
And
=
In steady state, the rate of heat flow should be same in whole system
=
(i)
Hence, heat flow from composite slab is
=
(ii)
Accordingly,
(iii)
By comparing Eqs. (ii) and (iii), we get
. Rate of heat flow=And
=In steady state, the rate of heat flow should be same in whole system
= (i)Hence, heat flow from composite slab is
=
(ii)Accordingly,
(iii)By comparing Eqs. (ii) and (iii), we get
The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity and 2 and thickness and 4, respectively are and . The rate of heat transfer through the slab, in a steady state is , with equals to
physics-General
Let the temperature of common interface be . Rate of heat flow
=
And=
In steady state, the rate of heat flow should be same in whole system
=
(i)
Hence, heat flow from composite slab is
= (ii)
Accordingly, (iii)
By comparing Eqs. (ii) and (iii), we get
. Rate of heat flow=And
=In steady state, the rate of heat flow should be same in whole system
= (i)Hence, heat flow from composite slab is
=
(ii)Accordingly,
(iii)By comparing Eqs. (ii) and (iii), we get