Question

I Choose the correct answer. 1. Anything that occupies space and has mass is called A) Matter B) Object C) Element. D) None. 2 . In solids forces of attraction between the molecules are A) Week B) Strong C) Very week. D) None 3.The change of state from solid to liquids is A) Melting B) Freezing C) Condensation D) None. 4. The amount of heat required to change the state A) Specific heat B) Boiling point C) Latent heat D) Melting point II. Answer the following questions. 5. We can smell perfume sitting several meters away due to------- 6. The process of phase change from solid to gaseous state directly without changing into liquid state is called----- 7. The separation technique used to separate sand and water from a mixture of sand and water from a mixture of a sand and water is------​

Answer 1

Answer:

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Given: AB∥CD

Construction: Draw a perpendicular on CD from B, meting CD at E

Thus, BE = AD

Now, In △ABD,

BD2=AD2+AB2

252=AD2+72

AD=24 cm

thus, BE=AD=24 cm

and CE=CD−AB=17−7=10 cm

Now, In △BCE

BC2=BE2+CE2

BC2=242+102

BC2=676

BC=26 cm