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CBSE Questions for Class 7 Physics Heat Quiz 11 - MCQExams.com
CBSE
Class 7 Physics
Heat
Quiz 11
Weather reports are made using __________ thermometer
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Clinical
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Laboratary
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Maximum-minimum
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None of these
Explanation
The maximum and minimum temperatures of the previous day, reported in weather reports, are measured by a thermometer called the maximum-minimum thermometer, thus option $$C$$ is correct.
A clinical thermometer is not used to measure anything else apart from human body temperature.
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True
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False
Explanation
A clinical thermometer is not used for anything else than measuring the temperature of any object other than the human body. A clinical thermometer reads temperature from $$35^\circ C$$ to $$42^\circ C$$.
Which of these is not a type of thermometer?
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Clinical thermometer
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Maximum-minimum thermometer
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High-low thermometer
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Laboratory thermometer
Explanation
Clinical thermometer is used to measure the temperature of human body whereas maximum-minimum thermometer is used in weather reports. Laboratory thermometers is used in labs but there are no high-low thermometers, thus option $$C$$ is correct.
Choose whether true or false:-
We can determine the temperature of any object through our sense of touch.
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True
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False
Explanation
Our sense of touch is relative. We can't use it to determine the hotness or coldness of every object because we can't touch too hot objects as we might burn our fingers thus the given statement is false.
We can only tell whether the substance that we are touching is hotter or colder than our body comparatively but we can not tell the temperature.For that we use thermometer.
___________ is a measure of the degree of hotness of an object.
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Thermometer
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Temperature
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Radiation
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None of these
Explanation
Temperature is a measure of the degree of hotness of an object.
A thermometer is a device used for measuring temperature.
The transfer of heat in which no medium is required is known as radiation
Choose whether true or false:-
Clinical thermometers can be washed using any temperature of water.
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True
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False
Explanation
A clinical thermometer is not washed using hot water, thus the given statement is wrong.
Why is sense of touch not reliable?
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It doesn't tell us what is hot or cold
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It doesn't work for all of us
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It might misguide us
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None of these
Explanation
Sense of touch might misguide us and lead us to make wrong observations regarding the hotness or coldness of any object, thus option $$C$$ is correct.
The thermometers are shaken to _______
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Reset them
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Bring mercury levels down
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To clean them
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None of these
Explanation
When the thermometer is shaken,
the jerks bring the level of mercury down, thus option $$B$$ is correct.
A clinical thermometer is very sturdy.
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True
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False
Explanation
The thermometer is handled with care, it can break if hit against hard object, it is not very sturdy, thus the given statement is false.
Choose the incorrect from the following statements:-
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Wash the thermometer before and after every use with an antiseptic lotion
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Always shake the thermometer before checking the temperature levels
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A thermometer can be placed anywhere
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The reading should be taken by keeping the level of mercury along the line of sight.
Explanation
The thermometer is not placed near a hot flame and is also not exposed to direct sunlight because mercury can receive energy from these sources and expand, this activity can damage the thermometer. thus the option $$C$$ is incorrect.
How is a clinical thermometer held?
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From the bulb
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From the tip
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From the glass tube
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None of these
Explanation
The thermometer that measures our body temperature is called a clinical thermometer. The thermometer is not touched near its bulb while reading the temperature, it is held from the glass tube, thus option $$C$$ is correct.
Where is the thermometer kept to measure the temperature?
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Under the tongue
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Between teeth
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Under arm pits
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On neck
Explanation
The thermometer is then kept under the tongue or under the arms in order to get the reading on the thermometer, thus options A and C are correct.
The thermometer is read keeping the level of mercury ________line of sight.
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In direct
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Above
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Below
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None of these
Explanation
The correct way to read a thermometer is by keeping the level of mercury along the line of sight. When you read the temperature on a thermometer, it should be vertical and your eyes should be level with the top of the liquid in the glass tube.
The figure is a _______ thermometer
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Clinical
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Laboratory
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Maximum-minimum
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None of these
Explanation
The temperature range in the given thermometer is very small. Hence this thermometer only comes into use at clinic to measure body tempareture.
Hence given thermometer is a clinical thermometer.
Traditional clinical thermometers are shaken before taking a reading.
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True
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False
Explanation
The thermometer is shaken before checking the temperature levels so that the mercury comes back to its initial point i.e. where it had been before the temperature was taken, thus the given statement is true.
Which of the following incorrectly represents the use of a laboratory thermometer?
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Checking boiling point
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Temperature of other substances
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Checking the temperature of non-clinical solvent
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Measuring atmospheric temperature
Explanation
Laboratory thermometers are designed for lab purposes such as checking boiling point, freezing point, or temperature of other substances and checking the temperature of a solvent but not a clinical one, thus options $$D$$ is incorrect.
Sea breeze blows during _________.
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summer
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winter
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day
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night
Explanation
During the day, the sun heats up air on the land.This air become hot and expand and rises due to which low pressure is created.The air over ocean is relatively colder and thus at higher pressure.The wind will blow from the higher pressure over the water to lower pressure over the land causing the sea breeze.Hence sea breeze occurs during day.
What is normal body temperature?
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Average body temperature of a large number of healthy persons
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Sum of body temperature of a large number of healthy persons
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Difference between body temperature of a large number of healthy persons
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None of these
Explanation
Normal body temperature is the average body temperature of a large number of healthy persons.
Hence, option A is correct.
A clinical thermometer consists of a long, narrow, uniform _______ tube
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Metal
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Silicon
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Glass
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Acrylic
Explanation
The thermometer that measures our body temperature is called a clinical thermometer. A clinical thermometer consists of a long, narrow, uniform glass tube, hence option $$C$$ is correct.
In a clinical thermometer, Outside the bulb, a small shining thread of _____ can be seen.
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Mercury
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Glass
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Water
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Air
Explanation
Outside the bulb, a small
shining thread of mercury can be seen, hence option $$A$$ is correct.
Land breeze blows during _______.
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Day
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Night
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Summer
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Winter
Explanation
At night, the land gets heated faster than the water
. The water cools down more
slowly than the land. So, the cool air
from the land moves towards the sea.
This is called the land breeze.
What temperature scale is usually used in a clinical thermometer?
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Fahrenheit scale
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Kelvin Scale
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Celsius scale
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None of these
Explanation
India has adopted the celsius scale and thus it used in clinical thermometers usually, hence option $$C$$ is correct.
Choose whether true or false:-
Laboratory thermometers can measure human temperature as well.
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True
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False
Explanation
A laboratory thermometer cannot be used to measure human body temperature. Due to the absence of kink in the laboratory thermometer, the level of mercury in its tube will start falling quickly as soon as we take out the bulb from our mouth.
Hence, the given statement is false.
The thermometer that measures our body temperature is called a _______ thermometer.
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Laboratory
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Clinical
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Maximum-minimum
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Pyrometer
Explanation
The thermometer that measures our body temperature is called a clinical thermometer.
A medical thermometer is used for measuring human or animal body temperature. The tip of the thermometer is inserted into the mouth under the tongue, under the armpit, into the rectum via the anus, into the ear, or on the forehead.
Identify the phenomena given in this picture.
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Day
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Land breeze
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Sea breeze
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Night
Explanation
The phenomenon is Sea breeze.
A sea breeze or onshore breeze is any wind that blows from a large body of water toward or onto a landmass; it develops due to differences in air pressure created by the differing heat capacities of water and dry land. As such, sea breezes are more localized than prevailing winds.
To receive the cooler sea breeze, the windows of the houses in coastal areas are made to face
the sea.
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True
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False
Explanation
While constructing a house in a coastal area, the windows should face the seaside as the sea breeze will keep it cool during day time. During day time when the temperature is relatively high as compared to night then land gets heated up due to which air above the land gets hot while the air above the sea is cool.So cooler air flows from sea to land, which is called sea breeze.
The cooler air from the sea move towards the land.
Which phenomena is this?
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Sea breeze
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Land breeze
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Summer
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Winter
Explanation
A sea breeze occurs due to the difference in temperature between the ocean and the land. As land heats up during the afternoon, air above it begins to rise forming a low pressure area near the land. Then cool air, situated in high pressure areas, spreads across the water and moves in over land.This moving in of air from sea to land is called sea breeze.
Identify the phenomena given in the picture.
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Night
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Land breeze
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Day
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Sea breeze
Explanation
The land breeze is a coastal breeze at night blowing from the land to the ocean. It is caused by the difference in the rates of cooling of the land and of the ocean.At night land is relatively cold and hence at higher pressure and sea is relatively warm and at lower pressure .So cold air from land at higher pressure flow to surface of sea which is at lower pressure. Because air flows from higher pressure region to lower pressure region.
The picture has warm air over sea and cool air over land hence it is the process of land breeze.
At night, the cool air
from the land moves towards the sea.
Which phenomena is this?
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Sea breeze
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Land breeze
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Summer
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Winter
Explanation
Land breeze, a local wind system characterized by a flow from land to water late at night. The land breeze is typically shallower than the sea breeze since the cooling of the atmosphere over land is confined to a shallower layer at night than the heating of the air during the day.
Who can experience the phenomena of sea breeze and land breeze?
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people living in the villages
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people living in the cities
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people living in the forests
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people living in the coastal areas
Explanation
A sea breeze occurs due to the difference in temperature between the ocean and the land. As land heats up during the afternoon, air above it begins to rise forming a low pressure area near the land. Then cool air, situated in high pressure areas, spreads across the water and moves in over land.This moving in of air from sea to land is called sea breeze.
Since it is a phenomena that happens at land and sea boundaries.
The people living in the coastal areas
experience this interesting phenomena.
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