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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 551. |
Among the following ____ represents the smallest temperature changeA. 1 KB. `1""^(@)C`C. `1""^(@)F`D. Both 1 and 2 |
| Answer» Correct Answer - A::C | |
| 552. |
The ratio of the quantity of heat absorbed by the surface of a body to the quantity of heat falling on it in one second is calledA. reflecting power of the bodyB. radiating power of the bodyC. transmitting power of the bodyD. absorbing power of the body |
| Answer» Correct Answer - D | |
| 553. |
Arrange the following steps in sequential order ot show that the conduciton of heat is different in different conductors (a) take two identical rods one is copper and the other is iron (b) The ends of the two rods are heated with the same spirit lamp (c ) fix some nails on the rods with the help of wax at equal distances (d) The nails near to the flame first from the copper rod and then from the iron rod.A. acdbB. abcdC. acbdD. adbc |
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Answer» Correct Answer - c Take two indentical rods one is copper and the other is iron .Fix some nails to the rods with sthe help of wax at equal distacne s ehat the two rods with same spirit lamp at obne end by holding at the other ends Now the nails near to the flame fall first from the coper rod and then form the iron roid .This happens because the conduction of heat in copper is faster than that in iron |
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| 554. |
For each of the question four choice have been porvided select the correct alternative Choose the correcty statementA. specific heat capacity of a body in all its states is constantB. specific heat capacity of a body is different in different statesC. specific heat capacity is a characteristic property of a material and it is different for different materialD. both b and c |
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Answer» Correct Answer - d Specific heat capacity of a body is the amount of het energy requird to raise the temperture of units mass of substance through `1^(@)C` .It is the characteristic proprerty of a body and it remains constant in a given stte but changes form state to state for a given substance |
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| 555. |
A pendulum clock whose pendulum is made of a meterial like iron ____ time in winter. |
| Answer» Correct Answer - gain | |
| 556. |
When heat energy is incident on a body, thenA. it is reflectedB. it is absorbedC. it is transmitted through itD. All the above |
| Answer» Correct Answer - D | |
| 557. |
Match the entries given in column A with the appropritate ones in column B |
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Answer» Correct Answer - A:d,B:e,C:b,D:f,E:a,F:c A-d Thermometric liquid should exert a very vapour pressure B-e Freezing point of water is marked as lower fixing point on the theremometer C-b Because of anomalous behavious of water auatic life can exist at the bottom even the top surface of the ponds freeze D-f Maximum temperature on the Mercury is about `240^(@)C` F-c Normal human body temperature is `37^(@)C =273+37=310 K` |
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| 558. |
Match the entries in column A with the appropriate ones in column B. |
| Answer» Correct Answer - `"A:b" " B:a"" C:d"" D:e"" E:g"" F:c"" G:f" " H:j"" I:i"" J:h"` | |
| 559. |
Match the entries given in column A with the appropriate ones in colum B. |
| Answer» Correct Answer - A:d,B:e,C:a,b,D:h,E:c,F:g,G:b,H:I,I:f | |
| 560. |
Match the entries given in column A with the appropriate ones in colum B. |
| Answer» Correct Answer - A:e,B:d,C:f,D:a,E:c,F:b | |
| 561. |
A steel scale is correct at `0^(@)C`. The length of a brass tube measured by it at `40^(@)C` is `4.5m`. The correct length of the tube at `0^(@)C` is (Coefficients of linear expansion of steel and brass are `11 xx 10^(-6//@)C` and `19 xx 10^(-6//@)C` respectively). |
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Answer» Correct Answer - `99.98cm` |
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| 562. |
If a cylinder of diameter `1.0cm` at `30^(@)C` is to be slid into a hole of diameter `0.9997 cm` in a steel plate at the same temperature, the minimum required rise in the temperature of the plate is: (Coefficient of linear expansion of steel`= 12 xx 10^(-6//@)C`) |
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Answer» Correct Answer - `57.3^(@)C` |
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| 563. |
A horizontal cylinder has two sections of unequal cross-sections, in which two pistons can move freely. The pistons are joined by a string. Some gas is trapped between the pistons. If this gas is heated, the pistons will (a) move to the left(b) move to the right (c) remain stationary (d) either (a) or (b) depending on the initial pressure of the gas |
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Answer» Correct Answer is: (b) move to the right The pressure of the gas remains constant, and is equal to the atmospheric pressure (for equilibrium of the ‘gas plus pistons’ system). If the temperature of the gas is increased, its volume must increase. For this, the pistons must move to the right. |
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| 564. |
A fan produces a feeling of comfort during hot season because………………. A) fan provides cool air B) it increases humidity C) of the evaporation of sweat D) fan cools the surrounding air |
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Answer» C) of the evaporation of sweat |
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| 565. |
We feel that some objects are cold, and some are hot. Is this feeling related in some way to our body temperature? |
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Answer» Yes. If the temperature of the object is lower than our body temperature, e.g., ice, we feel the object is cold. If the temperature of the object is higher than our body temperature, e.g., hot water, we feel the object is hot. |
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| 566. |
You know that as we go higher than the sea level, the boiling point of water decreases. What would be the effect on the melting point of a solid? |
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Answer» As we go higher than the sea level, the melting point of solids (i) that expand on melting is lowered due to a decrease in pressure (ii) that contract on melting is raised due to a decrease in pressure. [The wire used in the experiment is made of a metal (usually copper). Metals are good conductors of heat. Hence, exchange of heat between the portion of the ice above the wire and that below the wire takes place readily.] |
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| 567. |
For a substacne to undergo a change of state heat must be either given to it or taken away from it |
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Answer» Correct Answer - true For a substance to undergo a change of state heat must either be given to it or taken away from it |
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| 568. |
Fill in the blanks.1. The fastest mode of heat transfer is ………2. During day time, air blows from …… to ……3. Liquids and gases are generally ………conductors of heat. 4. The fixed temperature at which matter changes state from solid to liquid is called …… |
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Answer» 1. radiation 2. land, sea 3. bad 4. melting point |
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| 569. |
Assertion and Reason type questions.Assertion(A): Maximum sunlight reaches earth’s surface during the afternoon time.Reason(R): Heat from the sun reaches earth’s surface by radiation.Mark the correct choice as: (a) If both assertion and reason are true and reason is the correct explanation of assertion. (b) If both assertion and reason are true but reason is not the correct explanation of assertion. (c) If assertion is true but reason is false. (d) If assertion is false but reason is true. |
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Answer» (b) If both assertion and reason are true but reason is not the correct explanation of assertion. |
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| 570. |
True or False: 1 J = 4.18 cal. |
| Answer» 1 cal = 4.18 f. | |
| 571. |
True or False:In CGS system, heat is measured in joules. |
| Answer» In CGS, heat is measured in calorie | |
| 572. |
Assertion and Reason type questions.Assertion(A): Food can be cooked faster in copper bottom vessels. Reason (R): Copper is the best conductor of heat.Mark the correct choice as:(a) If both assertion and reason are true and reason is the correct explanation of assertion. (b) If both assertion and reason are true but reason is not the correct explanation of assertion. (c) If assertion is true but reason is false. (d) If assertion is false but reason is true. |
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Answer» (a) If both assertion and reason are true and reason is the correct explanation of assertion. |
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| 573. |
True or False:In CGS, specific heat capacity can be measured in calorie. |
| Answer» Specific heat capacity in CGS is measured in `cal//g^(@)C` | |
| 574. |
Calorie is the unit of (a) heat (b) work (c) temperature (d) food |
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Answer» Correct answer is (a) heat |
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| 575. |
The heat required to raise the temperature of 1 kg of water by `1^(@)C` is called one calorie |
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Answer» Correct Answer - false The heat required to raise the temperature of 1kg of water by `1^(@)C` is called one kilocatorie |
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| 576. |
The heat absorbed by a substance decreases with increases in temperature |
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Answer» Correct Answer - flase Heat absorbed by a substance increase with the increase in temperature |
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| 577. |
The temperature of boiling water can be mearused by a clinical thermometer |
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Answer» Correct Answer - true The maximum temperature that can be measured by using a clinical thermomete is less than the boiling point of water |
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| 578. |
Give some liquids which solidify (convert into solid) in winter season. |
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Answer» Coconut oil, ghee are some liquids which solidify in winter season. |
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| 579. |
If you touch a piece of wood and a piece of metal which were kept in the fridge for the same period of time then the result isA) metal piece is colder than wooden piece B) wooden piece is colder than metal piece C) both are at same temperature D) none |
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Answer» A) metal piece is colder than wooden piece |
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| 580. |
……………… is a measure of thermal equilibriumA) TemperatureB) HeatC) MassD) None |
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Answer» A) Temperature |
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| 581. |
Three bodies A, B and C are in thermal equilibrium, the temperature of B is 45°C, then the temperature of C is A) 45° C B) 50° C C) 40°C D) any temperature |
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Answer» Correct option is A) 45° C |
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| 582. |
What is freezing? |
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Answer» Freezing : The process in which the substance changes from liquid to solid state by losing some energy from it is called freezing. |
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| 583. |
Efficiency of heat engine is defined as theA. product of the work done by the heat engine and amount of heat supplied to it.B. ratio of the amount of heat supplied to it and work done by the heat engine.C. ratio of the work done by the heat engine and amount of heat supplied to it.D. ratio of amount of heat supplied to it and amount of heat dissipated |
| Answer» Correct Answer - C | |
| 584. |
Which will have lower temperature when we take out a wooden piece and a metal piece from a fridge? |
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Answer» The metal piece will have lower temperature as compared to the wooden piece when they are taken out of the fridge. |
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| 585. |
When do you say there is thermal equilibrium between two bodies? |
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Answer» It is said that there is thermal equilibrium between two bodies when there is no transfer of heat energy between them. (OR) When temperature between two bodies is same it is said that there is thermal. equilibrium between them. |
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| 586. |
A gas expands from 1 litre to 3 litres at atmospheric pressure. The work done by the gas is about (a) 2 J (b) 200 J (c) 300 J (d) 2 x 105 J |
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Answer» Correct Answer is: (b) 200 J At constant pressure, work = pressure x change in volume |
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| 587. |
Why does water take more time to become hot and take more time to become cool? |
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Answer» Water has the highest specific heat among all liquids. So it takes more time to become hot and takes more time to become cool. |
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| 588. |
What role does specific heat play in keeping a watermelon cool for a long time after removing it from a fridge on a hot day? |
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Answer» 1. Generally, watermelon contains large percentage of water. 2. Water has high specific heat value than other substances. 3. High specific heat substances oppose the increase of temperature. Hence they continuous of the coolingness. 4. So watermelon retains coolness after removing from fridge on a hot day due to the high specific cheat of water. |
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| 589. |
State the three units of temperature. |
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Answer» The S.I. unit of temperature is kelvin or K. The other most common unit of temperature is degree Celsius (°C) and degree Fahrenheit (°F). |
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| 590. |
Say whether true or false, correct and rewrite the false statement:i. Glass is a bad conductor of heat.ii. In a thermos flask, hot things remain hot and cold things become warm.iii. Radiation of heat depends upon the colours of the outer surface of the body.iv. During radiation, the particles of the medium vibrate.v. Copper is better conductor of heat than iron. |
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Answer» i. True ii. False. In a thermos flask, hot things remain hot and cold things remain cold. iii. True iv. True v. True |
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| 591. |
What is meant by the term temperature. |
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Answer» Temperature is a quantity which tells the thermal state of a body (i.e. the degree of hotness or coldness). It determines the direction of flow of heat when the two bodies at different temperatures are placed in contact. |
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| 592. |
In the process of convection, heat travels 1. sideways 2. downwards 3. upwards 4. in all directions |
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Answer» In the process of convection, heat travels 3. upwards |
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| 593. |
Why is mercury or alcohol used in a thermometer? |
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Answer» Mercury is used in a thermometer because of the following properties. Alcohol is used in a thermometer for the following properties. 1. It can measure a low temperature because its freezing point is low. (-115°C) but it can not measure higher temperature as its boiling point is low. 2. It can measure the temperature precisely because it has large expansion coefficient. 3. It’s expansion is regular. 4. Less hazardous. |
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| 594. |
In the previous question, let V0 be the volume of each container. All other details remain the same. The number of moles of gas in the container at temperature 2T0 will be(a) p0V0 / 2RT0(b) p0V0 / RT0(c) 2p0V0 / 3RT0(d) p0V0 / 3RT0 |
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Answer» Correct Answer is: (c) 2p0V0 / 3RT0 p1V = n1RT1, p2V = n2RT2, p(2V) = (n1 + n2)RT |
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| 595. |
Explain the role of latent heat in the change of state of a substance. |
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Answer» When a solid is heated, initially, its temperature increases. Here, the heat absorbed by the body (substance) is used in increasing the kinetic energy of the particles (atomic, molecules, etc.) of the body as well as for doing work against the forces of attraction between them. As the heating is continued, at a certain temperature (melting point), solid is converted into liquid. In this case, the temperature remains constant and the heat absorbed is used for weakening the bonds and conversion into liquid phase (liquid state). This heat is called the latent heat of fusion. When a liquid is converted into the gaseous phase (gaseous state), at the boiling point, the heat absorbed is used for breaking the bonds between the atoms or molecules. This heat is called the latent heat of vaporization. Some solids, under certain conditions, are directly transformed into the gaseous phase. Here the heat is absorbed but the temperature remains constant. The absorbed heat is used for breaking the bonds between atoms or molecules. This heat is called the latent heat of sublimation. In general, latent heat is the heat absorbed or given out by a substance during a change of state at constant temperature. In transformations from liquid to solid, gas to liquid and gas to solid, latent heat is given out by the body (substance). (Note: change of state = change of phase) |
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| 596. |
When is air said to be saturated with water vapour? |
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Answer» When air contains maximum possible water vapour, it is said to be saturated with water vapour at that temperature. |
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| 597. |
What basis and how will you determine whether air is saturated with vapour or not? |
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Answer» Whether the air is saturated with water vapour or not is determined on the basis of the extent of water vapour present in the air. If the relative humidity is 100%, the air is saturated with water vapour. In that case, we can see the formation of water droplets on the leaves of plants/grass. If the relative humidity is less than 100%, the air is not saturated with water vapour. |
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| 598. |
On what basis and how will you determine wether air is saturated with vapour or not? |
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Answer» (i) We can determine whether air is saturated with vapour or not on the basis of relative humidity. (ii) Relative humidity is the ratio of actual mass of vapour content in air for given volume and temperature to that required to make air saturated with vapour at that temperature. (iii) If relative humidity is 100%, the air is saturated with vapour. This is called dew point. (iv) If its value is less than 100%, then air is unsaturated. |
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| 599. |
Heat energy brings about_______.A. chemical changes in matterB. changes in dimensionC. changes in temperatureD. all the above |
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Answer» Correct Answer - d Heat energy brings about change in the dimensions of a substances (object) chemical composition of substacne also change in its temperature |
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| 600. |
Choose the correct statement (a) Two thin woolen blankets keep ou body warmer than a single equally thick woolen blanket (b) Mud houses with thatcvhed roofs keep warm in summer and cool in winter as compared to concrete housedA. only aB. only bC. both a and bD. none of these |
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Answer» Correct Answer - a Two thin woolen blanker are warmer than a thick woolen blanket because there is an etra layer of air trapped between thin blankets which acts as and insultort and does not allow the heat form the body to flow out .mud houses with thatched rofs keep cool in summer and warm in winter as compareed to convrete houses because the thatched roof contains a large amount of trapped air . Hence in summer the heat form insie does not flow out. Thus they remain cool in summer and warm in winter |
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