Question

*What are the sealed tubes in a thermos flask made of?*

1️⃣ Iron
2️⃣ Glass
3️⃣ Steel
4️⃣ Plastic*Which of the following action reduces the heat escaping from the shiny surface of the flask?*

1️⃣ Conduction
2️⃣ Reflection
3️⃣ Convection
4️⃣ Radiation​

Answer 1

Answer:

Q1 = steel is right answer

Answer 2

Question 1) :- What are the sealed tubes in a thermos flask made of?

1) Iron

2) Glass

3) Steel

4) Plastic

Answer :- (3) Steel .

The sealed tubes in a thermos flask are made up of steel .

Question 2) :-

Which of the following action reduces the heat escaping from the shiny surface of the flask ?

1) Conduction

2) Reflection

3) Convection

4) Radiation

Answer :- (4) Radiation .

Explantion :-

The empty space between the two glass walls prevent the loss of heat through conduction and convection, as both of these processes need a medium to transfer heat.

But, the silvery wall of flask reflects back the heat and prevents its loss through radiation .

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