Heat - Class 7 - Science
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Back Questions - Heat | NCERT | Science | Class 7
State similarities and differences between the laboratory thermometer and the clinical thermometer.
Feature | Clinical Thermometer | Laboratory Thermometer |
---|---|---|
Usage | Used to measure body temperature | Used to measure temperature of substances in a laboratory |
Range | Range usually from 35°C to 42°C | Wider range, typically -10°C to 110°C |
Design | Has a kink to prevent mercury level from falling on its own | Does not have a kink, allowing mercury level to adjust according to the temperature of the environment |
Reading Temperature | Designed for fast reading of body temperature, and can be read after removing from the body due to the kink | Temperature must be read while the thermometer is in contact with the substance because there’s no mechanism to hold the mercury level |
Scale | Celsius scale, more focused on the human body’s temperature range | Celsius scale but covers a much broader range suitable for various experiments |
Give two examples each of conductors and insulators of heat.
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Sign up nowFill in the blanks :
(a) The hotness of an object is determined by its ____________.
(b) Temperature of boiling water cannot be measured by a ____________ thermometer.
(c) Temperature is measured in degree ____________.
(d) No medium is required for transfer of heat by the process of ____________
(e) A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the process of ____________.
(f) Clothes of ____________ clothes of light colours. colours absorb more heat better than clothes of light colours.
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Sign up nowMatch the following:
(i) Land breeze blows during | (a) summer |
(ii) Sea breeze blows during | (b) winter |
(iii) Dark coloured clothes are preferred during | (c) day |
(iv) Light coloured clothes are preferred during | (d) night |
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Sign up nowDiscuss why wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.
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Sign up nowIn places of hot climate it is advised that the outer walls of houses be painted white. Explain.
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Sign up nowOne litre of water at $30^{\circ} \mathrm{C}$ is mixed with one litre of water at $50^{\circ} \mathrm{C}$. The temperature of the mixture will be
(a) $80^{\circ} \mathrm{C}$
(b) more than $50^{\circ} \mathrm{C}$ but less than $80^{\circ} \mathrm{C}$
(c) $20^{\circ} \mathrm{C}$
(d) between $30^{\circ} \mathrm{C}$ and $50^{\circ} \mathrm{C}$
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Sign up nowAn iron ball at $40^{\circ} \mathrm{C}$ is dropped in a mug containing water at $40^{\circ} \mathrm{C}$. The heat will
(a) flow from iron ball to water.
(b) 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.
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Sign up nowA 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.
(d) does not become cold.
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Sign up nowStainless 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.
(c) copper is a better conductor of heat than the stainless steel.
(d) copper is easier to clean than the stainless steel.
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Sign up nowExtra Questions - Heat | NCERT | Science | Class 7
Select the correct structure of the sentence. $\mathrm{N}=$ noun phrase; $\mathrm{V}=$ verb phrase; $\mathrm{Adj}=$ adjective phrase; $\mathrm{P}=$ prepositional phrase I love summers.
A $\mathrm{N}-\mathrm{V}$
B $\mathrm{N}-\mathrm{V}-\mathrm{Adj}$
C $\mathrm{N}-\mathrm{V}-\mathrm{N}$ D $\mathrm{N}-\mathrm{V}-\mathrm{N}-\mathrm{P}$
The correct structure for the sentence "I love summers" is represented by option C $\mathrm{N}-\mathrm{V}-\mathrm{N}$.
Here, the breakdown of the sentence is as follows:
- "I" is a noun phrase (N), denoting the subject.
- "love" is a verb phrase (V), denoting the action.
- "summers" is another noun phrase (N), functioning as the object of the verb.
Thus, the structure is a sequence of noun phrase, verb phrase, followed by another noun phrase, which is succinctly captured as N-V-N.
How does Earth receive most of its heat? [3 MARKS]
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Sign up nowAn aqueous solution of $\mathrm{NaCl}$ is heated with a Bunsen burner. The conductivity of the solution should
A) increase
B) decrease
C) remain constant
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Sign up nowThermometers are used to measure the quantitative value of
A) heat
B) temperature
C) calories
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