7. Things that are placed in an object simply get hot on heating but the shape of that object remains unchanged. Write two examples to support this sentence.

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Solution

When things are placed in an object simply get hot on heating but the shape of that object remains unchanged. The heating of the objects are the reversible changes. The two examples are given below:
(i) When we cook any dish in a pressure cooker, the cooker and its handles get hot but their shape remains unchanged.
(ii) When we pour hot tea in a cup, the cup also gets hot. But its shape or size does not change.

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Similar questions

Q. Read the following paragraph and answer the questions.
If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy.
The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box.
i. Heat is transferred from where to where?
ii. Which principle do we learn about from this process?
iii. How will you state the principle briefly?
iv. Which property of the substance is measured using this principle?

Q. Mention two examples of each.
1. Objects that sink in water
2. Objects that float on water
3. Objects that dissolve in water
4. Objects that do not dissolve in water

A glass filled with ice cubes was placed on a table. After a while, water droplets appeared on the glass surface.

Which of these sentences is/ are TRUE?
i) This phenomenon is known as condensation.
ii) This proves that water vapour is present in the air.
iii) This is also observed when a hot object vapour in the open.

Question 6

(a) ______ is the property of a material that enables us to see things through it.

(b) Which type of object allows us to see things clearly through it. Give an example.

(c) Define a translucent object.

(d) Name a material that is opaque but it can be made translucent by rubbing it with a little amount of oil.

Whenever and object is able to change its state of rest or state of uniform motion, it being applied by one of the unbalanced forces.

Now in this sentence why is it said state of uniform motion and not simply motion?

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