☰
Matter In Our Surroundings
Can you say if the following objects have energy ? If they do, identify whether the energy is kinetic, potential or combination of the two:
(i) A ceiling fan which has been switched off.
(ii) A man climbing a hill.
(iii) A flying bird.
(iv) Water in the reservoir of a dam.
(v) A spring expanded beyond its normal shape.
(vi) A rubber band lying on a table.
(vii) A stretched rubber band lying on the ground.
The enrgy possesed by the object are as given below:
(i) Potential energy
(ii) both kinetic and potential energy
(iii) both kinetic and potential energy
(iv) potential energy
(v) potential energy
(vi) potential energy and
(vii) potential energy
Sponsor Area
Convert the following temperatures to Kelvin scale.
35°C
Give reason for the following observations.
Naphthalene balls disappear with time without leaving any solid.
Give reason for the following observations.
We can get the smell of perfume sitting several metres away.
What is the physical state of water at
a) 25°C
b)00C
c)1000C
What is the physical state of water at
0°C
What is the physical state of water at
100°C
Give two reasons to justify
Water at room temperature is a liquid.
Give two reasons to justify
An iron almirah is a solid at room temperature.
Why is ice at 273K more effective in cooling than water at the same temperature ?
What produces more severe burns, boiling water or steam ?
Sponsor Area
Sponsor Area