Available Answers

1. 1.

   Fill In the blanks:

   1. The two commonly used instruments for measuring volume of liquids are _____________ and _____________.
   2. The more tightly packed the molecules are in a substance, the _____________ that substance is.
   3. 1 cm³ = _____________ mL = _____________ mm³.
   4. The volume of a cylinder is π x (_____________)² x height.
   5. The slightly curved liquid surface in the measuring cylinders is known as  _____________.
   6. Two boys driving their car on the road with the same speed are at _____________ relative to each other.
   7. A coin mover a carom board is an example of _____________ motion.
   8. The distance-time graph for a uniform motion depicts a _____________ line.
   9. Weight ot a body is the measure of _____________ pull on the body.
   10. The _____________of a body can never be zero.
   11. In dry cells, the _____________ energy gets converted to the energy.
   12. When the pendulum is at rest, the position is called the _____________ position.
   13. In the entire path of the roller coaster, the total _____________ energy is conserved.
   14. The process of changing of energy from one form to the another is called  _____________.
   15. _____________ energy sustains life on the earth.
   16. _____________ reflection makes the non-luminous objects visible.
   17. The image formed by a plane mirror is _____________ whereas the Image formed by the pinhole camera is _____________.
   18. The word AMBULANCE is written right to left on a vehicle due to _____________. 
   19. The speed of light Is the highest in _____________.
   20. A smooth and highly polished surface such as mirror _____________ all the light that falls through it.
   21. The substances that catch fire easily are called the _____________ substances.
   22. 1 cal is equal to _____________ J.
   23. A thermometer is based on the principle that matter _____________ on heating
   24. The difference between the boiling point and the freezing point is _____________ degrees in both the Celsius and Kelvin scales.
   25. _____________ expands the most on heating and expands the least.
   26. Sound is produced by a _____________ body.
   27. Bad reflectors of sound are known as the _____________ materials.
   28. Human adults cannot hear _____________ and _____________ sounds.
   29. One complete to and fro motion which constitutes one wave is called an  _____________.
   30. Higher the frequency of the sound wave _____________ is its pitch.
   31. The strength of a magnet is _____________ at its pole.
   32. An electromagnet is a _____________ with a soft iron core.
   33. Secondary cells are also termed as the _____________ cells.
   34. The longer vertical line in the representation of the cell signifies the _____________ terminal.
   35. The _____________ is the component which opposes the flow of current in a circuit.
2. 2.

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

   1. Graph paper is used for measuring the area of an irregular object.
   2. A heavy body has more mass per unit volume than a lighter body, i.e., it has lesser density,
   3. The SI unit of volume is litre (L).
   4. Displacement method is used for determining the area of the irregular solids.
   5. Speed = Distance x time.
   6. Rotatory motion and translatory motion are the same.
   7. Flying butterfly is an example of multiple motion.
   8. The movement of hands of the clock is a periodic motion.
   9. The Sl unit of mass is milligram.
   10. Weight and mass are the same entities.
   11. The mechanical energy is further divided into two types: kinetic energy and light energy.
   12. A water bottle lying on a table has no energy.
   13. A man climbing a hill po5sesses the potential as well as the kinetic energy.
   14. Green plants convert light energy to heat energy.
   15. Burning of fossil fuels changes chemical energy to the muscular energy.
   16. Light can travel in a curved path.
   17. All objects reflect light.
   18. The angle between the reflected ray and the normal is called the incident angle.
   19. We cannot verify the laws of reflection.
   20. The image formed by the plane mirror cannot be obtained on a screen.
   21. Sun is a vast source of heat energy.
   22. The bulb in the thermometer is filled with mercury.
   23. When heat is given to a body, its temperature falls.
   24. There is a change in the size of the body due to heating.
   25. A bimetallic strip consists of two rods of the same length and same materials.
   26. Reed instruments are the devices that produce sound when their tightly stretched membrane is struck or rubbed by hand.
   27. Sound can travel in vacuum.
   28. Loudness distinguishes a feeble sound from a loud sound of the same frequency.
   29. Pitch is independent of the number of vibrations per second.
   30. We can hear an echo in a small room as well.
   31. The poles of a permanent magnet can be reversed easily.
   32. In an atom, the protons remain in the nucleus and are unable to move.
   33. The polarity of the magnetic field of earth is opposite to the polarity of the earth's geographical poles.
   34. There is a risk of leakage of chemicals in the dry cell.
   35. Graphite, a non-metal, is a good conductor of electric current.
3. 3.

   Define the term density of a substance.

4. 4.

   Arrange the following in the order of increasing density: mercury, water, iron.

5. 5.

   How are the CGS and the Sl units of density related?

6. 6.

   How will you determine the volume of the sphere?