According to Wien's displace law :
- ✓$\lambda_{ m } \propto T ^{-1}$
- B$\lambda_{ m } \propto T ^{-2}$
- C$\lambda_{ m } \propto T ^4$
- D$\lambda_{ m } \propto T ^{-4}$
Answer: A.
View full solution →Question types
PART - 2 CH - 10 Thermal Properties of Matter question types
136 questions across 8 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
136
Questions
8
Question groups
5
Question types
01
M.C.Q (1 Marks)
23 Q→02Fill In The Blanks[1 Marks ]
10 Q→031 Marks Question
44 Q→042 Marks Questions
23 Q→053 Marks Question
7 Q→065 Marks Questions
17 Q→07True False[1 Marks ]
10 Q→08Match the following.
2 Q→Sample Questions
PART - 2 CH - 10 Thermal Properties of Matter questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Two pieces of an iron are heated and brought in a dark room. One of them glows red and the other blue then :
- AThe temperature of red glowing piece will be more
- ✓The temperature of blue glowing piece will be more
- CThe temperature of both the pieces will be same
- DNothing can be said about their temperature
Answer: B.
View full solution →Two spheres A and B are heated till the sphere A appears orange and B red. Then the relation between their temperatures will be :
- A$T_A>T_B$
- ✓$T_A=T_B$
- C$T_A < T_B$
- DNone of these
Answer: B.
View full solution →Which of the following statement is not correct :
- AA good absorber is a good emitter.
- BEvery object emits radiation at every temperature and absorbs.
- CThe rate of cooling of an object is proportional to the temperature excess.
- ✓The emission efficiency of an ideal black-body is the same for all wavelengths radiations.
Answer: D.
View full solution →The area below the given curve between emission capacity $E _\lambda$ of a black-body and $\lambda$. is proportional to :
- ✓$T^4$
- B$T ^5$
- C$T ^2$
- D$T ^3$
Answer: A.
View full solution →According to Wien's law the temperature of the sun surface is approximately ____________.
The rate of cooling increases as the specific heat of the radiating body ____________increases.
Heat is required to convert 1 kg of ice to $0^{\circ}\text C $ into 1kg of water at $0^{\circ}\text C $ in ____________kilo calorie.
View full solution →SI unit of molar specific heat is ____________.
It is the ratio of linear, areal and volume expansion ____________coefficient.
Why are gas thermometers more sensitive than mercury thermometers?
What is cooling curve? What is its shape?
The rate of radiation from a body depends on which power of the body's absolute temperature?
On what factors does the rate of heat emitted by a hot object depend?
Write the use of Wien's displacement law.
When the filament of a bulb is given an energy of 32 watt then its temperature becomes 2000 K. Find that energy given to the filament when its temperature becomes 3000 K. Here the filament acts, as black-body.
If the absolute temperature of a black- body is double what would be its effect on emitted energy?
The cross - sectional area of a non - conductor plate is $100 cm^2$ and its thickness is 2 cm . Its co-efficient of thermal conduction is $2 cal / s . cm$ ${ }^{\circ} C$. If the temperature difference between the two ends of the plate is $50^{\circ} C$ then calculate how much heat would flow through the plate in 10 hours?
View full solution →Find out when a 50 m long steel rod of 10 $c m ^2$ cross-section is heated from $0^{\circ} C$ to $50^{\circ} C$ (i) increase in length of rod (ii) if both the ends of the rod are connected to rigid supports, then the force produced in it will know thermal stress. (Given $\alpha=1.2 \times 10^{-5}{ }^{\circ} C ^{-1}$ and $\left.Y =9.6 \times 10^7 N / m ^2\right)$
View full solution →A layer of ice of 20 cm thickness accumulates on the surface of the water of a pond. The temperature of air is $-10^{\circ} C$. The thickness of the ice layer is 0.1 cm, how long will the increase take? The conductivity of ice is $2.1 \text {Joule}~ \text {sec} ^{-1} m^{-1} k ^{-1}$, latent heat $3.36 \times 10^5 \text {Joule}~\text {kg} ^{-1}$ and density $10^3$.
View full solution →The temperature of two solid spheres of same material of diameters 10 cm and 8 cm are $327^{\circ}\text C $ and $227^{\circ}\text C.$ Temperature of the environment is $27^{\circ}\text C.$ With the help of Stefan's law compare the rates of cooling of the two spheres.
View full solution →Three rods of equal length $L$ and equal cross-sectional area $A$ are connected in series. The thermal conductivities of their substances are $K , 2 K$ and $1.5 K.$ If the temperature of the open ends of the first and last rods are $200^{\circ} C$ and $18^{\circ} C$ then calculate the temperature at both the junctions whereas the radiation of heat loss is negligible.
View full solution →
The period of oscillation of the pendulum of a steel clock at $20^{\circ} C$ is 2 seconds. If the temperature of the clock increases by $30^{\circ} C$, what will be the gain or loss in measuring time every day? The coefficient of linear expansion of steel is $1.2 \times$ $10^{-5}{ }^{\circ} C ^{-1}$.
View full solution →What are the different properties of the material used in heat thermometer?
A metal sphere cools from $62^{\circ}\text C $ to $50^{\circ}\text C $ in first 10 minutes and in next 10 minutes it cools up to $42^{\circ}\text C.$ Calculate its temperature next 10 minutes according to Newton law of cooling.
View full solution →(i) Explain spectrum of black-body radiation.
(ii) Write Wien's displacement law. From this law find the temperature of its.
(ii) Write Wien's displacement law. From this law find the temperature of its.
Write Stefan's law and with the help of it establish a relation between the rate of fall in temperature and rate of emission of radiation.
Write Newton's law of cooling and state its necessary conditions. Derivation of Newton's law of cooling from Stefan's law.
What is meant by thermal radiation? What is the nature of thermal radiation? Explain.
The emission efficiency of an ideal black-body is the same for all wavelengths of radiation.
The law showing the relationship between the wavelength of peak emission and temperature of an ideal black-body in Planck's law.
The expansion in volume of a substance due to increase in temperature does not depend on the temperature difference.
Latent heat is the amount of heat required to change the state of a substance without changing its temperature.
Molar specific heat capacity $\text S = \text {CM}$
View full solution →| A | B |
| 1. The value of coefficient of linear expansion $\alpha$ is equal to | (A) Nature of matter |
| 2. The value of coefficient of areal expansion $\beta$ is equal | (B) Less |
| 3. How many times is the coefficient of volume expansion of a substance its coefficient of linear expansion? | (C) $\frac{\Delta L }{ L \times \Delta T }$ |
| 4. What does specific heat capacity depend on? | (D) $\beta=\frac{\Delta A}{A \times \Delta T}$ |
| 5. The greater the mass of the radiating body, the greater the rate of cooling. | (E) $\gamma=3 a$ |
| A | B |
| 1. Which is the scale in which the freezing point is divided into 180 equal parts, taking the freezing point as 32°F and the steam point as 212°F? | (A) Charles's |
| 2. Which is the scale in which freezing point is considered to be 0°R and steam point is considered to be 80°R divided into 30 equal parts. Has been divided | (B) $K = C +$ 273.15 |
| 3. Temperature measured in any scale can be converted to temperature on another scale | (C) Fahrenheit scale |
| 4. Which is the equation by which if the temperature of one system is known the temperature of another system can be determined? | (D) rumor temperature |
| 5 The volume and pressure of a gas depend on temperature as per the rule | (E) $\frac{ T _1}{T_2}=\frac{ X _1}{ X _2}$ |
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