English Medium Class 9 - CBSE Question Bank Solutions for Science

What type of wave is represented :
(a) by density-distance graph?
(b) by displacement-distance graph?

Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.

1. What could X be ?
2. What could Y be ?
3. Name the process Z.
4. Which process would you use to recover both the components X and Y from tincture of iodine ?
5. Which process can be used to recover only component Y from tincture of iodine ?

Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.

1. What could X be ?
2. What could Y be ?
3. Name the process Z.
4. Which process would you use to recover both the components X and Y from tincture of iodine ?
5. Which process can be used to recover only component Y from tincture of iodine ?

The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolves in a liquid D. The constituent B is a blue coloured salt which is insoluble in liquid D but dissolves easily in another liquid E. The constitudent C is a liquid which is used in cooking food and forms a solid fat on hydrogenation.

(a) What do you think could (i) constituent A, and (ii) liquid D be ?

(b) What could (i) constituent B, and (ii) liquid E be ?

(c) What could liquid C be ?

(d) How will you separate the mixture containing A, B and C ?

The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolves in a liquid D. The constituent B is a blue coloured salt which is insoluble in liquid D but dissolves easily in another liquid E. The constitudent C is a liquid which is used in cooking food and forms a solid fat on hydrogenation.

(a) What do you think could (i) constituent A, and (ii) liquid D be ?

(b) What could (i) constituent B, and (ii) liquid E be ?

(c) What could liquid C be ?

(d) How will you separate the mixture containing A, B and C ?

Name the two types of waves which can be generates in a long flexible spring (or slinky).

Name one pair of liquids which can be separated by using a separating funnel.

Name one pair of liquids which can be separated by using a separating funnel.

What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?

What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?

State the general name of the waves in which the particles of the medium vibrate :
(i) in the same direction as wave.
(ii) at right angles to the direction of wave.

What type of waves are illustrated by the movement of a rope whose one end is fixed to a pole and the other end is moved up and down?

Distinguish between longitudinal and transverse waves.

Are sound waves longitudinal or transverse?

What is the difference between a compression and a rarefaction in a sound wave? Illustrate your answer with a sketch.

What is sound? What type of waves are sound wave in air?