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)