Question 13 :
Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its ________.
Question 20 :
True or False. An iron almirah is solid at room temperature.
Question 22 :
True or False. We can get the smell of perfume sitting several metres away.
Question 23 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2e8f59b460d7261f654.png' />
From the above figure, Name B in the following diagram showing change in its states.
Question 24 :
Arrange the following substances in increasing order of forces of attraction between the particles-water, sugar, oxygen.
Question 25 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2e9f59b460d7261f655.png' />
From the above figure, Name C in the following diagram showing change in its states.
Question 28 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2e9f59b460d7261f656.png' />
From the above figure, Name D in the following diagram showing change in its states.
Question 29 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2eaf59b460d7261f657.png' />
From the above figure, Name E in the following diagram showing change in its states.
Question 30 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2ebf59b460d7261f658.png' />
From the above figure, Name F in the following diagram showing change in its states.
Question 31 :
True or False. Naphthalene balls disappear with time without leaving any solid.
Question 33 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2e7f59b460d7261f653.png' />
From the above figure, Name A in the following diagram showing change in its states.
Question 34 :
True or False. The particles of matter are in constant motion.
Question 35 :
True or False. Gas fills completely the vessel in which it is kept.
Question 36 :
True or False. A wooden table should be called a solid.
Question 37 :
True or False. Gas do not exerts pressure on the walls of the container.
Question 38 :
True or False.We can easily move our hand in air but to do the same through a solid block of wood, we need a karate expert.
Question 39 :
The mass per unit volume of a substance is called density . Arrange the following in order of increasing density-air, exhaust from chimneys, honey, water, chalk, cotton and iron.
Question 44 :
True or False. Our palm feel cold when we put some acetone or petrol or perfume on it.
Question 46 :
True or False. The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.
Question 47 :
True or False. Matter is composed of very small particles like atoms or molecules.
Question 48 :
True or False. The particles of matter do not have space between them.
Question 50 :
True or False. The particles of matter do not attract each other.