Question 5 :
With the increase in wind speed, the particles of water vapour move away with the wind, __________ the amount of water vapour in the surrounding.
Question 7 :
Take two glasses/beakers filled with water. Put a drop of blue or red ink slowly and carefully along the sides of the first beaker and honey in the same way in the second beaker. Leave them undisturbed in your house or in a corner of the class. How many hours or days does it take for the colour of ink to spread evenly throughout the water?
Question 8 :
Collect the following articles— a pen, a book, a needle and a piece of wooden stick. Sketch the shape of the above articles in your notebook by moving a pencil around them. Do all these have a definite shape, distinct boundaries and a fixed volume?
Question 10 :
We can easily move our hand in the air but to do the same through a solid block of wood we need a karate expert. Why?
Question 11 :
Which state of matter has no fixed shape and no fixed volume?
Question 14 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2c1f59b460d7261f620.PNG' />
In the above figure, what is 'a'?
Question 15 :
Liquids generally have a lower density than solids. But you must have observed that ice floats on water. Why?
Question 16 :
Which of the following are matter?
Chair, air, love, smell, hate, almonds, thought, cold, lemon water, smell of perfume.
Question 17 :
We can get the smell of perfume sitting several metres away. Why?
Question 19 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2c1f59b460d7261f621.PNG' />
In the above figure, what is 'b'?
Question 21 :
Arrange the following substances in increasing density. Air, exhaust from chimneys, honey, water, chalk, cotton, iron.
Question 22 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2caf59b460d7261f62d.PNG' />
Name F in the above diagram showing a change in its state.
Question 27 :
If the amount of water in air is already high, the rate of evaporation ________.
Question 28 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2c2f59b460d7261f622.PNG' />
In the above figure, what is 'c'?
Question 29 :
A gas fills completely the vessel in which it is kept. Why?
Question 30 :
Which state of matter has fixed volume but no fixed shape?
Question 32 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2c8f59b460d7261f62b.PNG' />
Name D in the above diagram showing a change in its state.
Question 36 :
Take a 100 mL beaker. Fill half the beaker with water and mark the level of water. Dissolve some salt/ sugar with the help of a glass rod. Observe any change in water level. Does the level of water change?
Question 43 :
On increasing the temperature of solids, the kinetic energy of the particles _______.
Question 44 :
Collect the following articles— a pen, a book, a needle and a piece of wooden stick. Sketch the shape of the above articles in your notebook by moving a pencil around them. Try compressing them by applying force. Are you able to compress them?
Question 45 :
Particles of matter are continuously moving, then they possess which energy?
Question 47 :
______ have a tendency to maintain their shape when subjected to outside force.
Question 49 :
Why does a desert cooler cool better on a hot dry day?
Question 50 :
The fluorescent tube and neon sign bulbs consists of plasma. TRUE or FALSE?