Available Answers

1. 1.

   Fill in the blanks.

   1. Anything that has mass and occuples space is _______.
   2. The force of attraction that exists between different types of molecules is _________.
   3. The space between the molecules of a subtance is called ________.
   4. Heating an ice cube results in it's ___________.
   5. Generally, all the metals have high __________ point.
   6. Actual density of a material can be obtained by multiplying it's _________ with 1000 kg m^-3.
   7. The liquid of ______ density will settle over the other liquids, when mixed together.
   8. The specific gravity bottle is also called __________.
   9. The volume of a Eureka can is equal to the __________ of the liquid upto the spout.
   10. ______ are least dense among all the states of matter.
   11. Force is a ________ quantity as it depends or magnitude and direction.
   12. When force is applied on the handle of the wrench , it produces a ________ on the boilt and tightness it.
   13. 1 kgf m = _______ N m.
   14. 1 Pa = ________ N m^-2
   15. The pressure exerted in the tip due to the ______ area is large.
   16. Distance and displacement are equal if the body moves in a _______ path.
   17. When the force applied on the body brings about a _________ in it's position, it is said that the work is done.
   18. The gravitational potential energy of a body is directly proportional to it's ________.
   19. The value of acceleration due to gravity is ________.
   20. A toy car having a wound spring possesses _______ potential energy.
   21. The bending of light in entering a new medium is called the _____ of light.
   22. More the speed of light slowed down as it is enters a medium, the __________ will be the refractive index of the medium.
   23. When a ray enters a denser medium, it always bends ______ the normal.
   24. The value of refractive index of the glass is _________ for the violet colour.
   25. A water droplet is optically _______ than the air around it.
   26. The transfer of heat continues till the bodies have achieved the _______ temperature.
   27. Heating leads to _________ in the kinetic energies of the molecules 
   28. Greater the area of exposed surface, ___________ is the evaporation.
   29. The boiling point of a Liquid is ________ proportional to the Atmospheric Pressure.
   30. When a material is cooled , it _________.
   31. Sound travels the fastest through the ________.
   32. The region of low density of air particles is called the _________.
   33. The vibration of the object produces _________.
   34. The sound of the slowest frequency is known as the ________.
   35. A tight and thin string produces a sound of _______ pitch.
   36. ________ is an example of an animal that produces electricity.
   37. _________ proved that the lightning is a stream of
2. 2.

   State whether the given statements are true (T) or false (F).

   1. CO₂ is an atom.
   2. Due to the random constant motion, the molecules posseses potential energy.
   3. Force of attraction between molecules of wood is an example of the force of adhesion.
   4. Liquids have a fixed shape.
   5. Evaporation is independent of the presence of moisture in the air.
   6. If the mass of the body increases , the volume of that body increases accordingly.
   7. For converting 1 kg m^-3 into 1 g cm^-3, we divide it by 1000.
   8. By finding the volume of overflown liquid, the volume of object is determined.
   9. The density of water is same in all the forms.
   10. When milk is mixed with liquid, the milk floats over the top.
   11. Wide belts increase the area of contact and decrease the pressure.
   12. Liquid pressure by mercury would be less than the liquid pressure by water.
   13. Drinking from straw is an application of the atmospheric pressure.
   14. Barometer is used to measure atmospheric pressure.
   15. A dropper and straw work on the mechanism using the atmosphere pressure.
   16. A stretched catapult has stored kinetic energy.
   17. On raising a body on a height, work is done against the gravitational pull.
   18. In microphone, the sound energy is comverted to the heat energy.
   19. Power is inversely proportional to time taken to do the work.
   20. 1 kilowatt(KW) = 1000 W.
   21. Disperion does not take place in a rectangular glass slab.
   22. Blue colour is used to indicate the electrical towers.
   23. A spherical mirror is a part of a hollow sphere.
   24. A virtual image is inverted in nature.
   25. Concave mirrors are used is the vigilance mirrors 
   26. 1 kilocalorie = 4200 joules
   27. Evaporation is directly proportional to the speed of the wind.
   28. Boiling is a surface phenomenon.
   29. The unit of coefficient is maximum in liquids.
   30. The extent of expansion is maximum in liquy.
   31. Loudness if a sound varies as the cube of the amplitude.
   32. Sound travels in all directions.
   33. An increased column in wind instruments leads to production of a soft sound.
   34. The sound produced by an instrument is a complex sound called timbre.
   35. Monotone helps us in recognising the voice of our friends.
   36. Plug has three holes out of which two are at the lower end and one is at the upper side.
   37. Black colour is given to the earth wire.
   38. Primary batteries can be recharged.
   39. When both of the leaves of the gold-leaf electroscope acquire same charge, they diverge.
   40. Neutron has no charge.
3. 3.

   When does the state of matter change from one form to the another?

4. 4.

   Why solids cannot be compressed?

5. 5.

   How is it possible for the molecules of gases to show constinuos zigzag motion?

6. 6.

   What happens when you leave a glass full of ice cubes at the room temperature?