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Science MCQ (1 Marks)

Heat · CBSE STD 7 (CBSE - English Medium). 158 questions.

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MCQ (1 Marks)

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MCQ 11 Mark
The heat is transferred directly from its source to another place without help of any substance in between, without a medium is:
  • A
    Convection
  • B
    Conduction
  • ✓
    Radiation
  • D
    None of these
Answer
Correct option: C.
Radiation
The heat is transferred from its source to another place without help of any substances in between without a medium, is radiation.
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MCQ 21 Mark
Which colour absorbs more heat?
  • ✓
    Black
  • B
    White
  • C
    Blue
  • D
    Red
Answer
Correct option: A.
Black
The more light the object absorbs, the more heat absorbed since light is energy. If you consider it a color, black absorbs the most heat. A black object absorbs all wavelengths of light and reflects none.
Objects that are white, on the other hand, reflect all wavelengths of light and therefore absorb the least heat.
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MCQ 31 Mark
Ventilators are provided at the top of a room:
  • A
    To bring oxygen for breathing.
  • B
    So that sunlight may enter the room.
  • ✓
    To maintain convectional currents to keep the air fresh in the room.
  • D
    To provide an outlet for carbon dioxide.
Answer
Correct option: C.
To maintain convectional currents to keep the air fresh in the room.
Hotter air has lower density in compare to cold air. The air we exhale is relatively hotter than the air present in the room so that hotter air moves upwards and normal air in the room seat downward. this process happens continuously, and at the top level in the room, hot air gets collected. To exhaust that air from the room we provide ventilators at the top. Ventilators also help to inter fresh air inside the room. The process of flow of air is known as conventional current.
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MCQ 41 Mark
Paheli Wants To Measure The Body Temperature Of Boojho. She Got $36.4$ Degree Celsius, $37.4$ Degree Celsius And $36.6$ Degree Celsius In First, Second And Third Times Respectively. What Is The Average Body Temperature Of Boojho$?$
  • A
    $37.8$ degree Celsius.
  • B
    $36.4$ degree Celsius.
  • C
    $37.4$ degree Celsius.
  • ✓
    $36.8$ degree Celsius.
Answer
Correct option: D.
$36.8$ degree Celsius.

$ (36.4 + 37.4 + 36.6)$ degree Celsius $= 110.4$ For getting average body tem we should divide: “Total temperature” by “Number of times” Therefore, $110.4/3 = 36.8$ degree Celsius.

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MCQ 51 Mark
$10^\circ C$ is equal to:
  • A
    $173 K$
  • B
    $273 K$
  • ✓
    $283 K$
  • D
    $183 K$
Answer
Correct option: C.
$283 K$

 We know,
$K = C + 273$
$K = 10^\circ C + 273$
$= 283K$

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MCQ 61 Mark
Name the device which is used to measure the hotness or coldness of an object:
  • A
    Picometer
  • B
    Barometer
  • C
    Manometer
  • ✓
    Thermometer
Answer
Correct option: D.
Thermometer
Thermometer
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MCQ 71 Mark
Which of the following methods of flow of heat is $($are$)$ based on gravitational attraction?
  • A
    Conduction
  • ✓
    Convection
  • C
    Radiation
  • D
    All of these
Answer
Correct option: B.
Convection
Convectional currents that are set up in vessels having considerable height, work on the principle that cooler, denser water tries to move downwards on account of its larger weight while the water closer to the heater i.e. the water at lower height gets heated up and tries to move upwards on account of lower weight.
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MCQ 81 Mark
Glass, plastic, wood are examples of:
  • ✓
    Insulator
  • B
    Conductor
  • C
    Radiators
  • D
    Convectors
Answer
Correct option: A.
Insulator
Insulator
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MCQ 91 Mark
Which of the following colour absorb maximum heat?
  • A
    White
  • ✓
    Black
  • C
    Blue
  • D
    Pink
Answer
Correct option: B.
Black
Black colour absorb maximum heat.
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MCQ 101 Mark
Heat always flows:
  • A
    From a colder object to a hotter object
  • ✓
    From a hotter object to a colder object
  • C
    In both the directions
  • D
    Heat never flows from one object to other
Answer
Correct option: B.
From a hotter object to a colder object
From a hotter object to a colder object
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MCQ 111 Mark
Heat transferred into solids by:
  • ✓
    Conduction
  • B
    Convection
  • C
    Radiation
  • D
    Insulators
Answer
Correct option: A.
Conduction
Heat transferred into solids by conduction.
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MCQ 121 Mark
A marble tile would feel cold as compared to a wooden tile on a winter morning because the marble tile:
  • ✓
    Is a better conductor of heat than the wooden tile.
  • B
    Is polished while wooden tile is not polished.
  • C
    Reflects more heat than wooden tile.
  • D
    Is a poor conductor of heat than the wooden tile.
Answer
Correct option: A.
Is a better conductor of heat than the wooden tile.
Is a better conductor of heat than the wooden tile.
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MCQ 131 Mark
Two layers of cloth of equal thickness provide warmer covering than a single layer of cloth of double the thickness, because they:
  • A
    Behave like a thermos
  • B
    Have lesser thickness
  • C
    Allow heat from atmosphere to the body
  • ✓
    Enclose between them a layer of air
Answer
Correct option: D.
Enclose between them a layer of air
Nair is a bad conductor of heat, hence if layer of air is isolated between two layers of cloth, warmer covering will be provided than if only one layer of cloth, where only body is isolated from surrounding air by cloth.
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MCQ 141 Mark
Which Of The Following Statement Is Or Are Incorrect?
  • A
    Radiation is transferred in the form of electromagnet.
  • B
    Conduction waves is transferred with the help of particles of materials.
  • ✓
    A land which is surrounded by water heated by convection.
  • D
    None of the above.
Answer
Correct option: C.
A land which is surrounded by water heated by convection.
A land which is surrounded by water heated not by convection. From the sun the heat comes to us by the process of radiation and heated all the objects which is present on the earth. Therefore, a land which is surrounded by water heated by radiation not by convection.
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MCQ 151 Mark
In a solid, heat is transferred mainly by the process of:
  • ✓
    Conduction
  • B
    Convection
  • C
    Radiation
  • D
    Conduction and convection both
Answer
Correct option: A.
Conduction
Thermal conduction is the transfer of heat $($internal energy$)$ by rigorous vibration of the microscopic particles and transferring the energy from one particle to another without any real flow of the particles. For example, heat is conducted from the bottom of a saucepan in contact with a stove to the handle of the saucepan.
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MCQ 161 Mark
The liquid metal used in a Thermometer is:
  • ✓
    Mercury.
  • B
    Silver.
  • C
    Gold.
  • D
    Copper.
Answer
Correct option: A.
Mercury.
Mercury.
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MCQ 171 Mark
Which of the following substance is not a bad conductor of heat ?
  • A
    Rubber
  • ✓
    Aluminium
  • C
    Glass
  • D
    Plastic
Answer
Correct option: B.
Aluminium
Some metals are better conductors of electricity than others. Silver, gold, copper, and aluminium are materials with free electrons and make good conductors. Silver is the best conductor of electricity, followed by copper, gold, and aluminium.
Hence, Aluminium is a good conductor of electricity.
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MCQ 181 Mark
The materials which allow the heat to pass through them easily are called:
  • A
    Insulators
  • ✓
    Conductors
  • C
    Semiconductors
  • D
    Poor conductors
Answer
Correct option: B.
Conductors
Conductors
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MCQ 191 Mark
One litre of water at $30^\circ c$ is mixed with one litre of water at $48^\circ c,$ the temperature of the mixture will be.
  • A
    $48^\circ c$
  • B
    $30^\circ c$
  • ✓
    Between $30^\circ c$ and $48^\circ c$
  • D
    More than $48^\circ c$
Answer
Correct option: C.
Between $30^\circ c$ and $48^\circ c$
Between $30^\circ c$ and $48^\circ c$
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MCQ 201 Mark
Expansion of a substance on heating depends on:
  • A
    Nature of the substance
  • B
    Rise in temperature
  • ✓
    Both $A$ and $B$
  • D
    Color of the substance
Answer
Correct option: C.
Both $A$ and $B$
Both $A$ and $B$
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MCQ 211 Mark
A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because:
  • A
    Friction between the layers of newspaper produces heat.
  • ✓
    Air trapped between the layers of newspaper is a bad conductor of heat.
  • C
    Newspaper is a conductor of heat.
  • D
    Newspaper is at a higher temperature than the temperature of the surrounding.
Answer
Correct option: B.
Air trapped between the layers of newspaper is a bad conductor of heat.
The air trapped between the layers of newspaper does not allow heat to pass through, so it helps the beggar to keep himself warm.
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MCQ 221 Mark
Higher the temperature of the body $........$ is the kinetic energy of the molecules of that body?
  • ✓
    Higher.
  • B
    Lower.
  • C
    Same.
  • D
    None of these.
Answer
Correct option: A.
Higher.
Higher.
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MCQ 231 Mark
The range of laboratory thermometer is:
  • A
    $70^\circ C$ to $110^\circ C$
  • ✓
    $-10^\circ C$ to $110^\circ C$
  • C
    $20^\circ C$ to $110^\circ C$
  • D
    None of these
Answer
Correct option: B.
$-10^\circ C$ to $110^\circ C$

$ -10^\circ C$ to $110^\circ C$ is the range of laboratory thermometer.

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MCQ 241 Mark
Which scale is used in clinical thermometer nowadays?
  • ✓
    Celsius scale
  • B
    Fahrenheit scale
  • C
    Both $(a)$ and $(b)$
  • D
    None of these
Answer
Correct option: A.
Celsius scale

 Celsius scale is used in clinical thermometer nowadays.

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MCQ 251 Mark
Paheli Wants To Know About “Heat”. Heat Is
  • ✓
    Form of energy.
  • B
    A type of matter.
  • C
    Neither energy nor matter.
  • D
    A form of fire.
Answer
Correct option: A.
Form of energy.
Most of us use the word ‘heat’ to mean something that feels warm, but science defines heat as the flow of energy from a warm object to a cooler object. Heat spontaneously passes to its surroundings with medium or without any medium. Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases.
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MCQ 261 Mark
One Litre Of Water At $30$ Degree Celsius Is Mixed With One Litre Of Water At $50$ Degree Celsius. The Temperature Of The Mixture Will Be:
  • A
    $80 $ degree Celsius.
  • B
    More than $50$ degree Celsius but less than $80$ degree Celsius.
  • C
    $20$ degree Celsius.
  • ✓
    Between $30$ degree Celsius and $50 $ degree Celsius.
Answer
Correct option: D.
Between $30$ degree Celsius and $50 $ degree Celsius.
 The mixture will have temperature in between $30$ degree Celsius and $50$ degree Celsius. They want to come on the same temperature. As one is released his temperature and other one is absorbed the temperature which is released. Therefore, we can say heat absorbed is equal to heat released. As heat is never been destroyed. Since, the hot water $($at $50$ degree Celsius$)$ will try to lose its heat to the cold water $($at $30$ degree Celsius$).$
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MCQ 271 Mark
The handles of cooking vessels are covered with plastic or wood because:
  • A
    They are beautiful.
  • B
    It is customary
  • C
    They are good conductors of heat
  • ✓
    They are bad conductors of heat
Answer
Correct option: D.
They are bad conductors of heat
The handles of the utensils have to be touched by us and could cause a burn if it is too hot. Handles made of poor conductors of heat are safer.
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MCQ 281 Mark
The unit of measurement of Temperature is:
  • A
    Meter.
  • B
    Kilogram.
  • ✓
    Degree Celsius.
  • D
    Second.
Answer
Correct option: C.
Degree Celsius.
Degree Celsius.
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MCQ 291 Mark
A wooden spoon is dipped in cup of ice$-$cream, its other end:
  • ✓
    Does not become cold
  • B
    Become cold by radiation
  • C
    Become cold by convection
  • D
    Become cold by conduction
Answer
Correct option: A.
Does not become cold
Does not become cold
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MCQ 301 Mark
Device used for measuring temperatures is called a:
  • A
    Barometer.
  • B
    Odometer.
  • ✓
    Thermometer.
  • D
    Speedometer.
Answer
Correct option: C.
Thermometer.
Thermometer.
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MCQ 311 Mark
Which currents are formed in all liquid on heating?
  • A
    Radiation current
  • B
    Conduction current
  • ✓
    Convection current
  • D
    None of thes
Answer
Correct option: C.
Convection current
Convection currents are formed in all liquid on heating.
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MCQ 321 Mark
A wooden spoon is dipped in a cup of ice cream. Its other end:
  • A
    Becomes cold by the process of conduction.
  • B
    Becomes cold by the process of convection.
  • C
    Becomes cold by the process of radiation.
  • ✓
    Does not become cold.
Answer
Correct option: D.
Does not become cold.
Does not become cold.
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MCQ 331 Mark
Name a metal among the following having highest heat conductivity:
  • ✓
    Silver
  • B
    Copper
  • C
    Aluminium
  • D
    Brass
Answer
Correct option: A.
Silver

 Following are the thermal conductivities of the following metals and alloys: ( in wK/m )
Silver$−430$ Copper$−400$ Aluminium$−235$ Brass$−109$
Order of thermal (heat) conductivity:
Silver>Copper>Aluminium>Brass
So, Silver has highest thermal conductivity

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MCQ 341 Mark
The substances which conduct heat easily are called:
  • A
    Convection
  • B
    Radiation
  • ✓
    Conductors
  • D
    None of these
Answer
Correct option: C.
Conductors
The substances which conduct heat easily is called conductor. Heat is transferred from hotter end to colder end is known as conduction.
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MCQ 351 Mark
In conduction, heat flows from:
  • A
    Hotter to hotter region
  • B
    Colder to hotter region
  • ✓
    Hotter to colder region
  • D
    Colder to colder region
Answer
Correct option: C.
Hotter to colder region
Heat energy always flows due to temperature differences. And the direction of flow is Hotter to colder region.
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MCQ 361 Mark
When matter gets warmer, the atoms and molecules in that matter $........$
  • A
    Stand still.
  • ✓
    Move faster.
  • C
    Move slower.
  • D
    Can't say.
Answer
Correct option: B.
Move faster.
Move faster.
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MCQ 371 Mark
Which of the following substance is a bad conductor of heat?
  • A
    Steel
  • B
    Gold
  • ✓
    Wood
  • D
    Silver
Answer
Correct option: C.
Wood
Wood is a bad conductor of heat.
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MCQ 381 Mark
Which thermometer records the highest and lowest temperature during a period of time?
  • A
    Clinical thermometer
  • B
    Laboratory thermometer
  • ✓
    Minimum and maximum thermometer
  • D
    None of these
Answer
Correct option: C.
Minimum and maximum thermometer

 Six's maximum and minimum thermometer is a registering thermometer that can record the maximum and minimum temperatures reached over a period of time, for example $24$ hours. It is used to record the extremes of temperature at a location, for instance in meteorology and horticulture.

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MCQ 391 Mark
Specific heat is:
  • A
    The specific temperature at which the substance is in solid state.
  • B
    The heat needed to increase the temperature of $1$ gallon of water by $1$ degree Fahrenheit.
  • C
    The amount of heat conducted in $1$ minute.
  • ✓
    The energy needed to increase the temperature of $1$ gram of a substance by $1$ degree Celsius.
Answer
Correct option: D.
The energy needed to increase the temperature of $1$ gram of a substance by $1$ degree Celsius.
The energy needed to increase the temperature of $1$ gram of a substance by $1$ degree Celsius.
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MCQ 401 Mark
Which of the following would expand most on being heated for some time?
  • ✓
    Air
  • B
    Water
  • C
    Iron
  • D
    All of these
Answer
Correct option: A.
Air
Air would expand most on being heated for some time.
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MCQ 411 Mark
Four arrangements to measure temperature of ice in beaker with laboratory thermometer are shown in figure $(a, b, c, d).$ Which one of them shows the correct arrangement for accurate measurement of temperature?
  • ✓
  • B
  • C
  • D
Answer
Correct option: A.

Thermometer $(a)$ has been put in correct way to measure the temperature.
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MCQ 431 Mark
Stainless steel pans are usually provided with copper bottoms. The reason for this could be that:
  • A
    Copper bottom makes the pan more durable.
  • B
    Such pans appear colourful.
  • ✓
    Copper is a better conductor of heat than the stainless steel.
  • D
    Copper is easier to clean than the stainless steel.
Answer
Correct option: C.
Copper is a better conductor of heat than the stainless steel.
Copper is a better conductor of heat than the stainless steel.
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MCQ 441 Mark
Thermos flask keeps hot liquid hot and cold liquid cold by:
  • A
    Cooling
  • B
    Using coolant
  • ✓
    Preventing heat loss
  • D
    Heating
Answer
Correct option: C.
Preventing heat loss
The silver coated surface becomes shiny, so it reflects all the heat inside the wall, and it does not allow the heat to go out. And the layer of glass wall thermo flask is thin, so it prevents the loss of heat by conduction.
Therefore, the thermo flask keeps cold liquid cold and hot liquid hot.
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MCQ 451 Mark
Sea breeze is caused due to:
  • A
    Conduction.
  • ✓
    Convection.
  • C
    Radiation.
  • D
    All of these.
Answer
Correct option: B.
Convection.
Convection.
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MCQ 461 Mark
Paheli and Boojho measured their body temperature. Paheli found her’s to be $98.6\ ^\circ F$ and Boojho recorded $37^\circ C.$ Which of the followng statement is true?
  • A
    Paheli has a higher body temperature than Boojho.
  • B
    Paheli has a lower body temperature than Boojho.
  • ✓
    Both have normal body temperature.
  • D
    Both are suffering from fever.
Answer
Correct option: C.
Both have normal body temperature.

 The temperature $37^\circ C$ is described in Celsius scale while the temperature $98.6^\circ F$ is described in Fahrenheit scale but they are actually equal. Both these values represent the normal average temperature of a human body.

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MCQ 471 Mark
In a room containing air, heat can go from one place to another by:
  • A
    Conduction
  • B
    Convection
  • C
    Radiation
  • ✓
    All of these
Answer
Correct option: D.
All of these
$1.$ Heat can travel by conduction as material medium is available as wall.
$2.$ Heat can travel by convection as material medium is available as air.
$3.$ Heat can travel by radiation as no material medium is needed.
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MCQ 481 Mark
Once In A Summer Day, Paheli Keeps An Iron Chair In Sunlight. After Few Hours, Iron Chair Gets Heated Because:
  • A
    Heat is transferred by conduction.
  • B
    Heat is transferred by convection.
  • ✓
    Heat is transferred by radiation.
  • D
    Heat is transferred by all the process.
Answer
Correct option: C.
Heat is transferred by radiation.
The transfer of heat by radiation does not require any medium. It can take place whether a medium is present or not. From the sun the heat comes to us by this process which is known as radiation. When we sit in front of a room heater, we get heat by this process. All the objects are heated from the rays of sun by this process.
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MCQ 491 Mark
The maximum and minimum temperatures of a day are measured with a.
  • A
    Celsius Thermometer.
  • B
    Fahrenheit Thermometer.
  • ✓
    Maximum$-$minimum thermometer.
  • D
    kelvin Thermometer.
Answer
Correct option: C.
Maximum$-$minimum thermometer.
Maximum$-$minimum thermometer.
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MCQ 501 Mark
A coin is dipped in molten wax kept in a glass tube. When we heat the upper part of the glass tube, the wax around the coin will not melt because:
  • A
    Wax has a very high melting point
  • B
    Wax is a good conductor of heat
  • C
    Glass is a good conductor of heat
  • ✓
    Wax and glass are bad conductors
Answer
Correct option: D.
Wax and glass are bad conductors
Glass is a bad conductor of heat hence the heat from the upper part of the glass tube will not transfer easily to the lower part. Having said that, even wax is a bad conductor of heat and won't melt easily.
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MCQ (1 Marks) - Science STD 7 Questions - Vidyadip