Heat And Thermodynamics

To keep drinks at the same temperature for quite sometime, the walls of thermos bottle are coated with

What is the temperature at which the fluid starts boiling at atmospheric pressure?

. . . . . . . . Celsius = 167 Fehreheit.

At what temperature will the water density be maximum?

Assertion(A): The boiling point of water decreases as the altitude increases. Reason (R): The atmospheric pressure increases with altitude.

Assertion (A): With the increase of temperature, the viscosity of glycerin increases. Reason (R): Rise of temperature increases kinetic energy of molecules.

The total amount of radiant energy emitted per unit area of a surface per second is called

Expansion during heating

A small gap is left at the joints of rails in a railway track to

Which of the following has got more heat capacity?

The main reason for heat transfer between fluid and gas is-

By which law of thermodynamics do you know the law of energy conservation?

Melting point of ice is-

Zero degree centigrade is equal to how many degrees Fahrenheit-

Air coolers are more suitable for

Lightning can even bum a tree because it contains tremendous amount of

The body temperature of a healthy man is

What is sublimation?

At what point the Fahrenheit temperature is double of Centigrade temperature?

What is the measure of the moisture present in air?

What is the value of 273 K?

Amount of heat per unit mass required to change a substance from a solid to a liquid at the same temperature and pressure.

When water freezes its density

Which one of the following statement regarding a thermo flask is not correct?

According to Wien's Law

If the temperature of a place increases suddenly, the relative humidity

Woolen clothes keep the body warm in winter because-

In an Earthen pitcher, the water remains cold due to the process of

The boiling point of an alcohol is 78°C. What is the temperature on the Kelvin scale?

The most important function of perspiration is to

Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known a

In Thermodynamic, Zero Law states that-

In a refrigerator, what produce the cooling?

Which color is inside the solar cooker?

The heat conduction in a cubic object does not depend on-

The four storke petrol engine is based on

Ocean currents are an example of

On a specific day and time, the temperature was 48°C in Churu and 24°C in Shimla. Two metallic cups identical in all respects contained water at 95°C in Churu and 71°C in Shimla. Which one of these two cups reached room temperature first?

Which of the following a bad conductor of heat?

Cloudy nights are warmer compared nights because clouds mainly

Assertion (A) The boiling point of water decreases as the altitude increases. Reason (R) The atmospheric pressure increases with altitude.

Which one of the following statements is not correct?

When red glass is heated in dark room it will seem

Water evaporates-

The hand bums more by steam comparatively to boiling water, because

What changes will happen to a bowl of ice and water kept at exactly 0°C?

Due to presence of . . . . . . . . in an object, it conducts electricity.

The blackboard seems black because it

What is the measure of room temperature on the Kelvin scale?

The silvering in thermo flask is done to avoid heat transfer by

If the door of a refrigerator is kept open, than which of the following is true?

The normal temperature of human body on the Kelvin scale is

°F = . . . . . . . . . °C

Assertion (A): Black hole is such a celestial existence which cannot be seen by telescope. Reason (R): The gravitational field of black hole is much strong that even light does not escape from it.

Refers to absolute zero temperature-

Assertion (A): Large cold storage plants use ammonia as refrigerant while domestic refrigerators use chlorofluorocarbons. Reason (R): Ammonia can be liquefied at ambient temperatures at low pressures.

When hot liquid is poured into a thick glass tumbler, it cracks because glass

Maximum temperature inside pressure cooker depends on

Why is it difficult to measure the coefficient of expansion of a liquid than solid?

When ice melts, then

Which of the following produces more severe burns?

Cloudy nights are warmer compared to clear cloudless nights, because clouds

On adding common salt to water, the boiling point and freezing point of water will

Which one of the following instruments is used for measuring moisture content of air?

Which of the following processes will have the slowest speed for the same volume of a liquid?

Match the following. List-I List-II a. Evaporation 1. Liquid into gas b. Sublimation 2. Liquid into solid c. Freezing 3. Solid into gas d. Melting 4. Solid into liquid

Assertion (A): A piece of copper and a piece of glass are heated to the same temperature. When touched, thereafter the copper piece appears hotter than the glass piece. Reason (R): The desity of copper is more than that of glass.

A gap is left between two rails of a railway track to accommodate . . . . . . . . of the metal.

Thermostat . . . . . . . . is a mean of Keeping Stable.

. . . . . . . . are comparatively bad conductors of heat

Pressure cooker cooks food in lesser time because

. . . . . . . . is not related to gases.

Under which condition real gas can work as an ideal gas?

According to Newton's Law of Cooling the rate of cooling of a body is proportional to the

When a glass rod is placed in steam, its length increases but its width

The normal temperature of a human body is . . . . . . . .

Assertion (A): A piece of ice added to the drink, cools it. Reason (R): Ice takes latent heat from the drink for melting resulting in the cooling of the drink. Select the correct answer:

Below is a statement (A) and a reason (R)- (A): Left a small gap between tracks (R): Iron spread in summer.

The amount of radiation emitted by a perfectly black body proportional to

Fruit stored in a cold chamber exhibit longer storage life because

A fan produces feeling of comfort during hot weather, because

A thermometer is used to measure

Water is used in hot water bags because it

A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?

To convert temperature from Celsius to Kelvin scale, you must:

Decrease in which of the following factors leads to an increase in the rate of evaporation?

Water boils at a lower temperature on the hills because

Which of the following is the example of ideal black body?

Let the average temperatures in Centigrade (C) and Fahrenheit (F) be $$overline C $$ and $$overline F $$. If $$overline C $$ and $$overline F $$ are related to $$F = frac{9}{2}C + 32,$$ xa0 then $$overline F $$ and $$overline C $$ have the relation

On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because

Running a fan in the summer season is given relief because-

Heat from the Sun reaches Earth by the process of

A perfect black body is one whose emissive power is

When a bottle is filled with water and it is freezing the bottle breaks down, because

Consider the figures of a metal ball and a metal ring given below. The metal ball can just pass through the hole of a metal ring formed out of a strip. When the ball is heated it gets stuck. But when the metal is heated

The boiling point of water decreases at higher altitudes is due to

Radiations coming from the sun are mostly in the form of

The temperature of a place on one sunny day is 113 in Fahrenheit scale. The Kelvin scale reading of this temperature will be

Water pipes in hilly areas often burst on a cold frosty night because

Transfer of heat by convection can take place in

The atmosphere is heated mainly by

Which of the following is correct? Specific volume of water when heated at 0 Celsius

The water from a hand pump is warm in winter because

A hydrogen inflated polythene balloon is released from the surface of the Earth. As the balloon rises to an altitude up in the atmosphere, it will

Super cooling stands for cooling of a liquid

Consider the following statements. Assertion (A): Light coloured clothes are preferred in summer. Reason(R): Light colours are poor absorbers of heat. Select correct answer:

Burns caused by steam are much severe than those caused by boiling water because

Which of the following represents a relation for heat lost = heat gained?

If thermal capacity of a body is expressed in terms of mass of water is called

Green house effect is the heating up of the Earth's atmosphere which is due to

Woollen clothes protect the body from cold because

Zeroth Law of Thermodynamics leads to

Which of the following does not require a medium?

Absolute zero is defined as

A liquid remains hot or cold for a long time in thermos flask because there is no loss or gain of heat by

In a refrigerator, the cooling system should always be

The boiling point of water is-

At which temperature, are fahrenheit and celsius equal?

In the season of summer, we experience a humid heat when weather

A cycle tyre bursts suddenly. This represents an

Energy can neither be generated nor destroyed but it can be transformed into another form, which is called?

Metal tea pots have wooden handles because

A glass vessel is filled with water up to the brim and a lid is fixed to it tightly. Then it is kept inside a freezer for hours. What is expected to happen?

Which one of the following scales of temperature does not have a negative value?

The working principle of a mercury thermometer is

Convert 372°C into Kelvin scale.

In a thermodynamic system the heat balance is achieved when two bodies reach at-

The coefficient of areal expansion of a material is 1.6 × 10 -5 K -1 . Which one of the following gives the value of coefficient of volume expansion of this material?

The brightness of a star depends on its

Which of the following is the methods of heat transfer?

. . . . . . . . is a superficial phenomenon

The variations in temperature from 0°C to 100°C with respect to time of two liquids P, Q are shown in the graph given below. Which of the following statement is correct?

The water kept in an earthen pot remains cool even in summer-

-273.15°C temperature is equal to:

Heat, in . . . . . . . . is a type of energy transfer from a warmer substance to a colder one.

What is the physical state of water at 257° Celsius?

Match the following. Process Changes a. Evaporation 1. Liquid into gas b. Sublimation 2. Solid into gas c. Freezing 3. Solid into liquid d. Melting 4. Liquid into solid

An assertion and its reason is given below. Assertion (A): Salt is used for cooking the food at places on higher from sea level. Reason (R): Temperature is low in higher places. Which one among these is right answer?

What does an air conditioner installed in a room control?

Which of the following is not a conductor of electricity?

It is difficult to cook rice

Which of the following principles does the refrigerator work on?

On which we gets the absolute zero pressure?

Blowing air with open pipe is an example of

Statement I While putting clothes for drying up, we spread them out. Statement II The rate of evaporation increases with an increase in surface area.

During the melting of solid, its temperature

The amount of heat required to change a liquid to gaseous state without any change in temperature is known as

To convert the temperature taken on the Kelvin scale to the Celsius scale-

Why boiling point of water decreases at high altitudes?

The lowest temperature is recorded by

When heated from 0°C to 10°C volume of given mass of water will

Opening the door of refrigerator kept in the room

During hot weather, the fan produces a feeling of comfort. This is because

The principle of evaporation of liquid to absorb heat, is used in-

If the temperature of air increases, how would it affect its ability to assume water vapour?

To change a temperature from the Kelvin scale to the Celsius scale, you have to

Which one of the following processes is not a part of long-wave radiation?

What changes will the volume of water show if the temperature is lowered from 9°C to 3°C?

Relation between the colour and the temperature of a star is given by

In which of the following phenomena do heat waves travel along a straight line with the speed of light?

Which is the branch of physics related to heat?

Specific heat of gas can have

Heat is not directly related to-

A glass bottle containing water tightly corked breaks when it is kep in freeze, because

Which one of the following is used as an antifreeze for the automobile engines?

What is absolute zero temperature?

Which of the following resistors is known as a heat sensitive resistor?

What is the temperature when a solid object melts at atmospheric pressure to become a liquid?

What would be the change in enthalpy (ΔH) for an ideal gas equation if the change in temperature (ΔT) is given- C p Heat capacity at constant pressure C v Heat capacity at constant volume

A reversible and an irreversible engines are working between the same limits of temperature. The efficiency of

The temperature of the sun is measured with

Cryogenic shows-

It is more comfortable to wear white cloth in summer because

Gases have

Which of the following law states that good absorbers of heat are good emitters?

The average kinetic energy of the molecules of an ideal gas is directly proportional to

The first law of thermodynamics is simply the case of

Consider the following statements. Assertion (A) Light coloured clothes are preferred in summer. Reason (R) Light colours are poor absorbers of heat. Select correct answer:

A hot body cools from 90°C to 75°C in 25 second. The same body in further cooling from 75°C to 60°C will take how much time?

The amount of radiation mainly depends upon the-

What is the relationship between Celsius to Kelvin temperature-

Water is used in car radiator because of its

Find the similarity of the following silver, copper, gold, aluminium.

When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will

The universe has a tendency to entropy-

If a gas is compressed to half of its original volume at 27°C, to what temperature should it be heated to make it occupy its original, volume?

Which of the following principle is used to produce low temperatures?

A conductor is said to be perfect if it has . . . . . . . . electrical conductivity.

The value of 40 degrees Celsius in Fahrenheit scale is

Humidity refers to

Why water particles at zero degree centigrade have more energy than ice particles at the same temperature?

The atmosphere exerts enormous pressure on us. But, we do not feel it because

If we plot a graph between volume V and inverse of pressure p (i.e. $$frac{1}{p}$$) for an ideal gas at constant temperature T, the curve so obtained is in

. . . . . . . . codified the first two laws of thermodynamics and deduced that the absolute zero of temperature is -273.15°C. He was honoured for this with then naming of the Kelvin temperature scale.

Which of the following is the conductor of electric charge?

One calorie of heat energy is equivalent to approximately . . . . . . . . joules of mechanical energy.

What temperature will Celsius and Fahrenheit scale show a similar reading?

At what temperature are the reading of a Centigrade and Fahrenheit thermometer the same?

What is Heat Balance?

Which of the following criteria is used for any metal to be used as a cooking material?

Why two thin shirts can keep us warmer than a single thick shirt in winter?

The normal temperature of human body is 98.4°F. It's equivalent temperature (in °C) is

At which temperature is the density of water maximum?

The temperature at which a liquid changes from its liquid state to a solid state is called-

If the work done on the system or by the system is zero, then which one of the following statement for a gas kept at a certain temperature is correct?

The absolute zero temperature is 0°K. In °C unit, which one of the following is the absolute zero temperature?

What will be the boiling point of water in the Kelvin scale?

In the night wind blows fast, dew is not formed because

Food gets cooked faster in a pressure cooker because

The cloudy nights are warmer than clear nights because

Woollen clothes keep the body warm because

The cooling by a desert Cooler is based on

What is the function of the thermostat of a refrigerator?

A circular plate, a cube and a sphere all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?

Which of the following is a good conductor of heat but bad conductor of electricity?

The difference in temperature between two bodies is 30° C. What is the difference in degree Fahrenheit?

Consider the following statements. Assertion (A): Space based solar power (SBSP), it is suggested be made a national goal. Reason (R): Supply of SBSP is 99% uninterrupted throughout the year, besides the enormity of energy availability. Select the correct answer:

When a piece of ice floating in a glass of water melts, the level of water will

We feel cool when we sit near the fan, this is because

The direction of heat flow between two body depends on which of the following?

The expected quality of a refrigerant is-

What is the freezing point of water-

What is the value of the temperature which is considered normal in human body-

When water is heated from 0°C to 10°C. It's volume

The safest temperature for keeping food fresh in a refrigerator is

Which one of the following changes occurs when salt is added into the water?

Xeric condition refers to

Cryogenics is a science dealing with

Surface water of a lake is about to freeze. What will be the temperature (in °C) of water at the bottom of the lake?

Which of the following statement(s) about specific heat of a body is/are correct? 1. It depends upon mass and shape of the body. 2. It is independent of mass and shape of the body. 3. It depends only upon the temperature of the body.

Why are dewdrops not formed on a cloudy night?

Assertion (A): The handle of pressure cooker is made up of Abonite. Reason (R): Abonite is a hard material.

The woollen clothes keep us warm in winter because they

What is the use of thermostat?

Thermal conductivity of a solid metal with increasing temperature-

Clear nights are colder than cloudy nights because of . . . . . . . .

Heat transfer horizontally within the atmosphere is called

When soggy biscuits are kept inside the fridge for sometime they become crisp because

Consider the following statements. 1. Steam at 100°C and boiling water at 100°C contain same amount of heat. 2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water. 3. In an air conditioner, heat is extracted from the room air at the evaporator coils and is ejected out at the condensor coils. Which of these statements is/are correct?

Centigrade which is the mother's unit of temperature is named on which of the following-

Assertion (A ) A piece of ice added to drink, cools it. Reason (R) Ice takes latent heat from the drink for melting resulting the cooling of the drink. Select the correct answer:

A gas thermometer is more sensitive than a liquid thermometer because a gas

Which of the following is the more thermal insulation in the group?

Borosilicate glass ware is used in microwave ovens because-

In a pressure cooker food is cooked in shorter time because

The density of the liquid when heated

The absolute zero is a temperature at which . . . . . . . .

Assertion (A): Woollen clothes keeps us warm. Reason (R): Woollen fibres are made from a special type of protein, which is a bad conductor of heat. Select the correct answer:

At boiling point of liquids, its

Mud houses are cooler in summers and warmer in winters as compared to brick houses because

Water is used in a hot water bag because

Transfer of heat is mainly due to conduction, convection and radiation in-

Temperature reaches zero absolute value-

Assertion and Reason are given below. Assertion (A): We prefer the white dress in winters. Reason (R): White dresses are good reflectors of heat. Which one among these is the right answer.

For which of the following process is the entropy change zero?

The temperature which has the same reading on both Fahrenheit and Celsius scales is

The heat required in calories to convert one gram of ice at 0°C to steam at 100°C is approximately

Cooling is done by

How much calories are there in a Joule?

14°F is equal to how many °C?

Steady state heat flow means-

Which one of the following statement is correct?

Sun's heat reaches us by

Consider the following statements. Assertion (A): If ice collects in the freezer, the cooling in the refrigerator is affected adversely. Reason (R): Ice is a poor conductor. Select the correct answer:

Which statement is correct regarding the principle of energy conservation?

Heat transfer to any system is measured in the . . . . . . . .

When pressure is increased, the melting point of ice

Thermal capacity of a body depends on the

Which of the following method the molecule of a fluid transmit the heat from one place to another?

Which of the following statement(s) about latent heat for a given substance is/are correct? 1. It is fixed at a given temperature. 2. It depends upon the temperature and volume. 3. It is independent of temperature and volume. 4. It depends on the temperature but independent of volume.

Steam at 100°C causes more severe bums than the water at the same temperature, because

Which thermodynamics law defines entropy?

Gas thermometers are more sensitive than the liquid thermometers because the gases

Which of these is a very good conductor of electricity-

If x the temperature of a system in Kelvin and y is the temperature of the system in °C, then the correct relation between them is

In a diesel engine, the high temperature needed to ignite the fuel as achieved by

What is the physical state of water at 12° Celsius?

Which one of the following statement with regarding to expansion of materials due to heating is not correct?

Which of the following devices can be used to detect radiant heat?

Lakes freeze in cold countries in winter, leaving the water underneath at

How much mechanical work must be done to completely melt 1g of ice at 0°C?

Which of the following thermodynamic process of constant volume is called?

Thermostat is related to

What is the freezing point of water on Kelvin scale?

Which electric device is not based on Joule's law of heating?

Match the following. List-I List-II a. Zeroth Law of Thermodynamics 1. Give us the concept of temperature b. First Law of Thermodynamics 2. Defines internal energy c. Second Law of Thermodynamics 3. Change in internal energy is zero d. In a complete cycle of changes 4. The efficiency of on engine is always less than unity

Ice is packed in saw dust because

The value of 50°C in Fahrenheit scale is

Which of the following statements is not true?

What is the boiling point of water?

In winter you touch a log of wood and a rod of iron, you will feed rod of iron is colder because

Boiling point of water is . . . . . . . .

What causes water pipes burst at freezing temperature?

What is, the product of pressure and volume and the sum of internal energy?

Thermal conductivity of aluminium, copper and stainless steel increases in the order

Thermostat is a device which

Heat stored in water vapour is

The statement that 'heat cannot flow by itself from a body at a lower temperature to a body at a higher temperature', is known as

A Kelvin thermometer and a Fahrenheit thermometer both give the same reading for a certain sample. What would be the corresponding reading in a Celsius thermometer?

A black body can absorb radiations of

In cold countries, alcohol is preferred to mercury as a thermo-metric liquid because

In which of the following conditions wet clothes will dry earliest?

Which one of the following has the highest value of specific heat?

Rate of evaporation increases with

Which temperature can water exist in both liquid and solid conditions?