In this post we will see class 7 Science Chapter 4 – Heat And Its Affect based on NCERT. It can be used for all the students studying in CBSE boards or any board which are using the NCERT books for their syllabus. All the answers are prepared by Expert teachers and are very useful for all the board using NCERT like CBSE, State boards.
you can check Previous Chapter Solutions here –
- NCERT Class 7th Science Chapter 1- Nutrition in Plants Solutions
- NCERT Class 7th Chapter 2nd solution – Nutrition in Animals – All Exercise Answers
- NCERT Solution Class 7th – Chapter 3 – Animal Fibre
Also Class 7th Science All chapters solutions here –
Exercise -1st Answer In Brief
Question -1 Give two Important effect of heat?
Solution – [1] Heat is a form of energy it is called thermal energy
[2] The effect of heat are change in temperature ,expansion , change of state and chemical of biological changes
Question -2 Why do electric wires sages between poles on hot day ?
Solution – Electric wires sag between poles on a hot day
Question – 3 Why are liquid used in thermometer ?
Solution – Liquid are used in thermometer because liquid expand on heating and contract on heating
Question – 4 Name the three commonly used scale of temperature?
Solution – [1] Celsius [2] farenhit [3] Kelvin
Question -5 Under what condition is better to use alchocal instead of mercury in a thermometer?
Solution –Alchocal is used in thermometer its feezing point is much lower than that of mercury therfore alchocal therm meters are useful in very cold places
Exercise -2nd – Answer in long
Question -1 Discuss the affect of heat?
Solution – [1] Heat is a form of energy it is also called thermal energy
[2] Heat can be transferred from one object to another
[3] Heat flows from an region of higher temperature to a region of lower temperature
[4] If heat is added to a substance like when we boil water on stove it become hot if we take away heat from object it becomes cold
[5] Heat can be also converted into other forms of energy For example heat energy can be converted to mechanical energy and vice versa
Question- 2 How is a smaller metal rim fixed on a bigger wooden wheel?
Solution – A metal rim is heated so that it expand an can be fitted over wooden wheel When the metal rim cools it contrats and grips the wheel firmly
Question – 3 Why are grapes left between length of railway line?
Solution – Railway tracks are constructed with gapes in the rail to allow the metal rail to expand due to the heat of the summer and heat generated by friction
Question – 4 Convert —
[1] 66 c to F [2] 37 C to F
Solution – [1] 66 C to F = 9/5 *37 -32
1 C= 5/9 *66 -32 =9/5 *5
= 5 *22/3 -32 = 9 F
= 110 – 32 /3
= 78/3
=26 F
Question – 5 Write an explation of a clinical thermometer explain the function?
Solution – A clinical thermometer is gratuted from 35 C to 42 C This is because the temperature of the human body varies only within this range the average normal body body temperature of a healthy human is 37 C there is a kink or a construction just above the bulb when the thermometer is placed under the tongue or under the arms of a person the mercury expands due to the warmth and pushes past like kink
Question – 6 State two difference between a laborty thermometer ?
Solution – The laborayry thermometer this thermometer is usually used in laborites to check the temperature during experiment The clinical thermometer is used to measure the temperature of the human the clinic thermometer is grattaded from 35 C to 42 C
Exercise -3rd Choose the correct answer
[1] If heat energy is removed from an object its temperature will ___________
[1] Fall [2] Rise [3]remain steady [4] fall and rise
Answer – Fall
[2] For the same rise in temperature which of the follwing statement is false
[1] Liquid expand more than solid
[2] solids expand less than gases
[3] liquid expand more than gases
[4] Gases expand more than solids
Answer – Liquid expand more than gases
[3] In the fahrenheit scale how many degrees are between thye upper and the lower fixed point
[1] 100 [2] 32 [3] 212 [4] 180
Answer – 180
[4] What would at 10 C rise in temperature be equal in to the fahrenhbeit scale?
[1] 10 F [2] 18 F [3] 50 F [4] 9 F
Answer – 50 F
[5] The temperature at which both the ceclius and fahrehneit scales give the same reading is
[1] 10 [2] 20 [3] -40 [4] -10
Answer – -40
[6] the boiling point of water on the fahreneit scale is
[1] 32 F [2] 0 F [3] 100 f [4] 212 F
Answer – 212 F
[7] In very cold place alchocal is used in thermometers of mercury because
[1] Its freezing point is lower
[2] its freezing point is higher
[3] It is more colourful
[4] It evaporates easily
Answer – Its freezing point is lower
Exercise 4th Fill in the blanks
[1] ________ flows from a region of _________ temperature to a region of _____________ temperature
Answer – Heat Higher lower
[2] Change of state is one of the effect of ______
Answer – Heat
[3] Liquid thermometer work on the principal that liquid ______________ on heating
Answer – Expand
[4] Temperature is a measure of the ____________ or ____________ of an object
Answer – Hot or Cold
[5] In India we use the __________ scale of temperature
Answer – Celsius
[6] In a clinical thermometer the difference between two marking is usually _______
Answer – 1C
[7] The lower fixed point in fahreneit is ______________ degrees
Answer – 32 F
[8] The temperature of melting ice is ________ C =___________ F
Answer – 0 & 32
[8] The lower fixed point of fahrenheit is ____________ deegres
Answer – 32 F
[9] the most commonly used liquid in thermometers is ___________
Answer – Mercury
Exercise 5th True or false
[1] Heat energy can be converted into other forms of energy [True]
[2] Heating can also result in chemical changes [True]
[3] solids expand the least on heating and liquids the most [True]
[4] The rate of expansion of all liquids on heating is the same [False]
[5] The boiling point of mercury is lower than that of alcohol [False]
[6] The kelvin scale is used by scientists all over the world [True]
[7] The body temperature of a normal healthy person is 37 [False]
[8] A rise of 1 K is egual to a rise of 1 C [True]
you can check All Chapters Solutions here –
- NCERT Class 7th Science Chapter 1- Nutrition in Plants Solutions
- NCERT Class 7th Chapter 2nd solution – Nutrition in Animals – All Exercise Answers
- NCERT Solution Class 7th – Chapter 3 – Animal Fibre
Also Class 7th Science All chapters solutions here –
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