properties of three states of matter.

Solid

1. They are rigid and incompressible.

2. Have definite volume and definite shape.

3. Minimum or no fluidity.

4. Can be stored without vessel.

5. Inter-molecular force of attraction is the maximum.

6. Least inter-molecular space hence, tightly packed.

Liquid

1. Not rigid and can be compressed to a little extent.

2. Have definite volume but no definite shape.

3. Slippery and fluid. They flow from higher level to lower level.

4. Need vessel for storing. Open vessel can store.

5. Inter-molecular force of attraction is intermediate. It is lesser than solid and greater than gases.

6. Inter-molecular space is greater than solids but lesser than gases.

Gas
1. These are not at all rigid and can be easily compressed.

2. Have neither definite shape nor volume.

3. Flow in all directions. Maximum fluidity.

4. Can be stored in a closed vessel only.

5. Inter-molecular force of attraction is the minimum.

6. Inter-molecular space is the maximum.

worksheet 1 Triangles

1. Give two different examples of pair of (i) similar figures. (ii) non-similar figures. Solution: Two square of sides 4 cm and 8 cm each. A rhombus and a trapezium . 2. State whether the following quadrilaterals are similar or not Solution: Similar 3. In the figure (i) and (ii), DE || BC. Find EC in (i) and AD in (ii). Solution: (i) In D ABC DE is parallel to BC By Basic Proportionality Theorem ------------------- (1) Given: AD = 1.5 cm, DB = 3 cm, AE = 1 cm Let EC = ‘x’ cm Applying in (1) 1.5x = 3 x = x = 2 cm EC = 2cm (ii) Since DE || BC, using BPT …………………………. (1) Given: DB = 7.2 cm, AE = 1.8 cm, EC = 5.4 cm Let AD be = x sub. in (1) x = = \ AD = 2.4 cm 4. E and F are points on the sides PQ and PR respectively of a Δ PQR. For each of the following cases, state whether EF || QR (i) PE = 3.9 cm, EQ = 3 cm, PF = 3.6 cm and FR = 2.4 cm (ii) PE = 4 cm, QE = 4.5 cm, PF = 8 cm and RF = 9 cm (iii) PQ = 1.28 cm, PR = 2.56 cm,

plant cell

Types and Distribution of Forest and Wildlife Resources

Types and Distribution of Forest and Wildlife Resources In India, forest and wildlife resources are owned and looked after by the government of India through its Forest Department. Forests are classified under three categories by the Forest Department Reserved forests The most valuable forests are classified as Reserved forests. These forests are protected under the conservation acts. More than half of the total forest land in India comes under Reserved Forests. Protected Forests Forests that are protected from further destruction are called Protected Forests. One-third of the total forest areas in India are classified as Protected forests. Unclassed forests Forests and wastelands belonging to both government and private individuals and communities are classified as Unclassed Forests. Forest density map Madhya Pradesh has the largest area under permanent forests . Andhra Pradesh, Uttarakhand, Kerala, Tamil Nadu, West Bengal, and M

4exam

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