Advertisements
Advertisements
प्रश्न
What do you observe when :
some ice cubes are kept in a glass tumbler
उत्तर
- Ice cubes (solid) turns into water state (liquid).
- Tiny water droplets can be seen on the glass tumbler walls.
- Only state changes i.e., physical change.
APPEARS IN
संबंधित प्रश्न
Convert the following temperature to the Kelvin scale.
373°C
Give two reasons to justify an iron almirah is a solid at room temperature.
What do you observe when :
water is boiled
Does the substance absorb or liberate any heat energy during the change of phase?
What is meant by saying that the latent heat of fusion of ice is 3.34 × 105 J/kg ?
What is the name of the process in which a solid turns directly into a gas ?
State one condition necessary to liquefy gases (other than applying high pressure).
Why does the temperature remain constant during the boiling of water even though heat is supplied continuously ?
Explain why, ice at 0° C is more effective in cooling than water at the same temperature.
Draw a labelled diagram of the experimental set-up to study the latent heat of fusion of ice.
Draw a labelled diagram of the experimental set-up to demonstrate the sublimation of ammonium chloride.
On converting 25°C, 38°C and 66°C to Kelvin scale, the correct sequence of temperatures will be :
Match the following:
| Column A | Column B |
| (a) Evaporation of water | (i) Non-periodic change |
| (b) Milk turning sour | (ii) Periodic change |
| (c) Earthquake | (iii) Chemical change |
| (d) Change of seasons | (iv) Physical change |
| (e) Glowing of bulb | (v) Reversible change |
Define the following terms: Fusion
Define the following terms: Sublimation
Explain the term vaporization
Fill in the blanks with the correct word/s from the bracket.
Ice on absorption of heat converts to ‘X’ a process called ____ [vaporization / melting]. ‘X’ changes to water vapour on ____ [heating / cooling]. Water vapour changes back to ‘X’ on ____ [freezing / condensation]. The constant temperature at which ice changes into ‘X’ is called its ____ [fusion point / melting point / boiling point].
Who am I?
I dissolve in water, but not in kerosene.
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
Are any new products formed during the above process.
Select the correct answer from A, B, C, D & E for the statement given below:
The state of matter which has ___________ least density & no free surfaces.
