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Science MCQ (1 Marks)

Heat · Gujarat Board (GSEB) STD 7 (GSEB - English Medium). 26 questions.

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MCQ (1 Marks)

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26 questions · auto-graded multiple-choice test.

MCQ 11 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 surroundings
Answer
Correct option: B.
air trapped between the layers of newspaper is a bad conductor of heat
B
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MCQ 21 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?
  • ✓

    Image
  • B

    Image
  • C

    Image
  • D

    Image.
Answer
Correct option: A.

Image
A
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MCQ 31 Mark
Boojho has three thermometers as shown in figure. He wants to measure the temperature of his body and that of boiling water. Which thermometer(s) should he choose?
Image
  • ✓
    Thermometers (i) and (iii) for measuring body temperature and (ii) for measuring the temperature of boiling water.
  • B
    Thermometer (i) for measuring both of the temperature.
  • C
    Thermometer (ii) for measuring both of the temperature.
  • D
    Thermometer (iii) for measuring both of the temperature.
Answer
Correct option: A.
Thermometers (i) and (iii) for measuring body temperature and (ii) for measuring the temperature of boiling water.
A
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MCQ 41 Mark
Paheli and Boojho measured their body temperature. Paheli found her to be 98.6°F and Boojho recorded 37°C. Which of the following statements is true?
  • A
    Paheli has a higher body temperature than Boojho.
  • B
    Paheli has a higher body temperature than Boojho.
  • ✓
    Paheli has a higher body temperature than Boojho.
  • D
    Both are suffering from fever.
Answer
Correct option: C.
Paheli has a higher body temperature than Boojho.
C
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MCQ 51 Mark
Which process causes the air above the hot tea to get heated?
Image
  • A
    Conduction
  • B
    Evaporation
  • C
    Convection
  • ✓
    Radiation
Answer
Correct option: D.
Radiation
D
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MCQ 61 Mark
Figure (a, b, c, d) shows the reading of four different thermometers. Indicate which of the reading shows the normal human body temperature?
  • A

    Image
  • B

    Image
  • ✓

    Image
  • D

    Image
Answer
Correct option: C.

Image
C
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MCQ 71 Mark
A student observes that when a folded sweater is pressed down and released, it easily gets pressed and then, instantly bounces back in shape. The student concludes that thick woollen fibres can trap a lot of air within their strands. Which option explains how woollen sweaters protect us from cold weather?
  • A
    Convection provided by the wool fibres and insulation by air
  • B
    Insulation provided by the wool and conduction of body heat
  • ✓
    Insulation provided by the wool fibres and air trapped in them
  • D
    Convection of heat by the human body and reflection by wool
Answer
Correct option: C.
Insulation provided by the wool fibres and air trapped in them
C
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MCQ 81 Mark
In a tropical country, during summers, which of the following materials is likely to absorb the least heat?
  • A
    Yellow rayon cloth
  • ✓
    White cotton cloth
  • C
    Blue denim cloth
  • D
    Maroon silk cloth
Answer
Correct option: B.
White cotton cloth
B
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MCQ 91 Mark
What acts as an indication of the weather outside being very cold, with temperature in the range of $-2^{\circ} C$ to $8^{\circ} C$ ?
  • A
    Mild sunlight
  • ✓
    Fogged window panes
  • C
    Leaves rustling in the wind
  • D
    Heavy clouds and grey skies
Answer
Correct option: B.
Fogged window panes
B
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MCQ 101 Mark
Which of the following instrument should be used to measure the boiling point of water?
  • A
    Clinical thermometer
  • ✓
    Laboratory thermometer
  • C
    Both (a) and (b)
  • D
    None of the above
Answer
Correct option: B.
Laboratory thermometer
B
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MCQ 111 Mark
Mercury and alcohol are two common liquids used in thermometers. The boiling point of mercury is $357^{\circ} C$, while its freezing point is $-39^{\circ} C$. For alcohol, the boiling point is $78^{\circ} C$ and the freezing point is $-80^{\circ} C$. It is required in a laboratory to make measurements which are in the region of $-60^{\circ} C$. Which type of thermometer would be more suitable?
  • A
    A mercury thermometer since the freezing point of mercury is higher than $-60^{\circ} C$.
  • B
    A mercury thermometer since the boiling point of mercury is as high as $357^{\circ} C$.
  • C
    An alcohol thermometer since the boiling point of alcohol is lower at $78^{\circ} C$.
  • ✓
    An alcohol thermometer since the freezing point of alcohol is lower than $-60^{\circ} C$.
Answer
Correct option: D.
An alcohol thermometer since the freezing point of alcohol is lower than $-60^{\circ} C$.
D
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MCQ 121 Mark
A maximum-minimum thermometer has two stems which record the highest and lowest temperature during a period of time. A small metallic piece in each stem indicates the temperature.
Image
What are the maximum, minimum and current (Fig.) 
Temperatures shown in this thermometer (Fig.)
Image
  • A
    $55^{\circ} C , 35^{\circ} C , 45^{\circ} C$
  • ✓
    $45^{\circ} C , 25^{\circ} C , 35^{\circ} C$
  • C
    $55^{\circ} C , 25^{\circ} C , 35^{\circ} C$
  • D
    $45^{\circ} C , 25^{\circ} C , 30^{\circ} C$
Answer
Correct option: B.
$45^{\circ} C , 25^{\circ} C , 35^{\circ} C$
B
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MCQ 131 Mark
What kind of material can be used for the handle (labelled A)?
Image
  • A
    Copper
  • ✓
    Wood
  • C
    Iron
  • D
    Stone
Answer
Correct option: B.
Wood
B
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MCQ 141 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
A
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MCQ 151 Mark
Which figure shows the correct way of reading the temperature on a thermometer?
  • A

    Image
  • ✓

    Image
  • C

    Image
  • D

    Image
Answer
Correct option: B.

Image
B
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MCQ 161 Mark
Figure (a, b, c, d) shows a student reading a doctor's thermometer. Which of the figure indicates the correct method of reading temperature?
  • ✓

    Image
  • B

    Image
  • C

    Image
  • D

    Image
Answer
Correct option: A.

Image
A
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MCQ 171 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
    None of the above
Answer
Correct option: B.
from a hotter object to a colder object
B
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MCQ 181 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
(C) copper is a better conductor of heat than the stainless steel
As copper is a better conductor of heat than the stainless steel, so stainless steel pans are usually provided with copper bottoms.
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MCQ 191 Mark
A wooden spoon is dipped in a cup of icecream, then 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
(D) does not become cold
It does not become cold because it is an insulator.
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MCQ 201 Mark
An iron ball at $40^{\circ} C$ is dropped in a mug containing water at $40^{\circ} C$. The heat will
  • A
    flow from iron ball to water
  • ✓
    not flow from iron ball to water or from water to iron ball
  • C
    flow from water to iron ball
  • D
    increase the temperature of both
Answer
Correct option: B.
not flow from iron ball to water or from water to iron ball
(B) not flow from iron ball to water or from water to iron ball
As heat can only flow from higher temperature to lower temperature. Thus, the heat will not flow from iron ball to water or vice-versa.
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MCQ 211 Mark
One litre of water at $30^{\circ} C$ is mixed with one litre of water at $50^{\circ} C$. The temperature of the mixture will be
  • A
    $80^{\circ} C$
  • B
    more than $50^{\circ} C$ but less than $80^{\circ} C$
  • C
    $20^{\circ} C$
  • ✓
    between $30^{\circ} C$ and $50^{\circ} C$
Answer
Correct option: D.
between $30^{\circ} C$ and $50^{\circ} C$
(D) between $30^{\circ} C$ and $50^{\circ} C$
Temperature of mixture is in between $30^{\circ} C$ to $50^{\circ} C$ because water at $50^{\circ} C$ losses some heat and water at $30^{\circ} C$ gains some heat.
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MCQ 221 Mark
Which of the following do not require any medium for heat transfer?
  • ✓
    Radiation
  • B
    Conduction
  • C
    Convection
  • D
    All of these
Answer
Correct option: A.
Radiation
A
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MCQ 231 Mark
The transfer of heat in liquids is done by
  • A
    radiation
  • ✓
    convection
  • C
    conduction
  • D
    None of the above
Answer
Correct option: B.
convection
B
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MCQ 241 Mark
Conduction occurs in
  • ✓
    solids only
  • B
    solids and gases
  • C
    liquid only
  • D
    None of the above
Answer
Correct option: A.
solids only
A
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