Advertisements
Advertisements
प्रश्न
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.
Advertisements
उत्तर
The zigzag movement of the small particles suspended in a liquid or a gas is called Brownian motion.
APPEARS IN
संबंधित प्रश्न
Name the terms for the change of vapour into a liquid.
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
The three important metalloids are.............................. and ..........................
Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
Give reason why copper metal is used for making electric wires.
Which of the following is not an element ?
What is the difference between solutions and colloids ?
Name the different types of solutions. Give one example of each.
Milk of Magnesia is :
Tincture of iodine has antiseptic properties. This solution is made by dissolving :
100 mL of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker.
- The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.
- What name is given to solutions like X ?
- What name is given to solutions like Y ?
- What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice ? Why ?
- What term is used to denote the amount of solid dissolved in 100 grams of water in a solution lie Y ?
What is the general name of the process by which tea-leaves are separated from prepared tea ?
Name the process by which common salt is purified.
One of the following does not undergo sublimation. This one is :
Which one of the following scrap metal cannot be separated by magnetic separation ?
______ is not made of matter.
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
Liquids cannot be compressed and they have fixed volume.
Liquids have ______.
