Thursday, 28 June 2018

CBSE Class 9 - Science - Matter In Our Surroundings - Reasoning Questions (#cbsenotes)(#class9Science)(#eduvictors)

Matter In Our Surroundings  Reasoning Questions

CBSE Class 9 - Science - Matter In Our Surroundings - Reasoning Questions (#cbsenotes)(#class9Science)(#eduvictors)


Q1: When 20-30g of salt is added to 500 ml of water in a beaker. We see salt dissolves and disappears in water. Give reasons for this.


Q2: If we put a drop of blue ink in a beaker filled with water and leave it undisturbed. Why does the water in the whole beaker turn blue?


Q3: Give reasons for the following observation:
The smell of hot sizzling food reaches you several metres away, but to get the smell from the cold food you have to go close.


Q4: Why is a diver able to cut through water in a swimming pool?


Q5: Sponge can be compressed. Why is it a solid?




Q6: Rate of diffusion of liquids is higher than that of solids. Give reasons for this?


Q7: Give reasons
   A gas fills completely the vessel in which it is kept.


Q8: Give reasons
    A gas exerts pressure on the walls of the container.


Q9: Give reasons
   A wooden table should be called a solid.


Q10: Give reasons
   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.


Q11: Liquids generally have a lower density as compared to solids. Why does ice float over water?


Q12: Why should we wear cotton clothes in summer?


Q13: Why do we feel cool when we pour some acetone (nail polish remover) on our palm?


Q14: Why do we see water droplets on the outer surface of a glass containing ice-cold water?


Q15: For any substance, why does the temperature remain constant during the change of state?


Q16: After raining, why doe roads are dried up quicker than potholes?


Q17: Why do clothes get dried up quickly in summer than in rainy season?


Q18: Water is kept in earthen pots to keep them cool. Give reasons.


Q19: Why does a desert cooler cool better on a hot dry day?


Q20: Why are we able to sip hot tea or milk faster from a saucer rather than a cup?

Q21: We should wear cotton clothes in summer. Why?


Q22: Give reasons for the following observations.
    Naphthalene balls disappear with time without leaving any solid.


Q23: An iron almirah is a solid at room temperature. Give reasons to justify it.


Q24: Why is ice at 273 K more effective in cooling than water at the same temperature?


Q25: Why do steam cause more severe burns than boiling water?



☛See also:
Ch 1 - Matter in Our Surroundings (Q & A)
Ch 1 - Matter in our Surroundings (Questions asked in CBSE papers - Unsolved)
Ch1 - Matter in our Surroundings (Unit Objective Test)
Ch1 - Matter in Our Surroundings (MCQs-1)
Ch1 - Matter In Our Surroundings (Question Bank)
Ch1 - Matter In Our Surroundings (Unit Test Paper)
Ch1 - Matter in Our Surroundings (MCQs-2)