Question

Fill in the blanks. [05]


1. See breeze blows from the -------- towards the earth.

2. During photosynthesis, the light energy changes into ------- energy.

3. An iron needle sinks in water as its density is ------- than 1 gcm-3

.

4. The Eureka can used to determine the volume of -------- solids.

5. ------- has highest specific latent heat of vaporisation.


II. Statements below are incorrect. Write the correct statements. [05]


1. A compressed spring of an air gun has kinetic energy.

2. It becomes cold during snowfall.

3. Pressure exerted by a liquid is inversely proportional to the density of liquid.

4. The SI unit of work is Pascal.

5. When a moving pendulum stops, its energy is destroyed.


III. Answer the following questions. (Any Five) [15]


1. State kinetic theory of matter.

2. Why does density vary from one substance to another substance?

3. How does the density of liquid change with rise in temperature?

4. How is sea breeze formed? Explain.

5. Describe how sun is the ultimate source of energy.

6. Why the hulls of submarine specially strengthened?


III. Answer the following questions. (Any Five) [15]


1. State Pascal’s law for transmission of pressure in enclosed liquid.

2. Give four examples of potential energy.

3. Why do objects made of wood float in water?

4. Why is the edge of knife kept sharp?

5. State the factors which determine kinetic energy of the body.

6. Why is mercury used as a barometric liquid?


VIII. Answer the following briefly. (Any two) [10]


1. A force of 25 N causes a displacement of 4 m in its own direction. What is the

magnitude of work done?

2. A force of 200 N acts on an area of 0.16 cm2

. What is the magnitude of pressure in

Pascal.

3. Volume of a metal cube is 200 cm3

. If the density of metal cube is 7.5 gcm-3

, find the

mass of the metal cube.





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Answer 1

Answer:

1st Sea

2nd Chemical

3rd Less

Answer 2

Explanation:

What is the magnitude of pressure in