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प्रश्न
Fill in the blank :
The substances which can flow are called ________
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उत्तर
The substances which can flow are called fluids.
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संबंधित प्रश्न
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
Name two processes which provide the best evidence for the motion of particles in matter.
In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?
The best evidence for the existence and movement of particles in liquids was provided by :
Give reason why copper metal is used for making electric wires.
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
- What type of substance is C ?
- Name the gas (i) D, and (ii) E ?
- State one characteristic property of gas D.
- Write one test to identify gas E.
What is the most common way of expressing the concentration of a solution ?
A solution contains 5.6 mL of alcohol mixed with 75 mL of water. Calculate the concentration of this solution.
What is the difference between solutions and colloids ?
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
One of the following is a solid foam. This one is :
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
What difference in the properties of oil and water enable their separation by a separating funnel ?
How is cream separated from milk ?
Which of the following cannot be separated from air by the process of fractional distillation ?
Stars including Sun are covered in ______.
Give an example of a molecule.
Write scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
Define the term matter.
