Class VII Physics Icse

1. By :-ASHWANI SAMNANI

2. PHYSICAL QUANTITIES
• A physical quantity is quantity which can be
measured.
For Example: length, mass, time, temperature, electric
current, light intensity, volume and many others.
• A physical quantity is always measured of natural
non-living objects.
• Physical quantities have numerical magnitude and
unit.
For Example: If the length of a student is 104cm, then
104 is its numerical magnitude and cm is the unit of
measurement.

3. PHYSICAL QUANTITIES
• The another example of physical quantity is that when
a grocer says that each sugar bag contains 5 kg, he is
describing its numerical magnitude as well as the unit
of measurement. It would be meaningless to state 5 or
kg only.

4. 1.1 Measurement of Volume
Q)What is Volume?
The volume of an object is the amount of space it occupies.

8. Measuring Cylinders

9. Measuring Cups

10. Measuring vessel to measure milk

12. 1.2 Measurement of Area
Q)What is Area?
Surface area is defines as the measurement of the surface of an object

14. How t o calculate the area of a irregular polygon?
1. First copy the irregular shape on the grid paper .
2. Make a note of size or scaled size of each square .
3. Next colour all of the square that lie completely within the
boundary of the shape

15. 4. Count them and call the number of interior squares ‘C’.
5. Use different colour for the squares that contain border of the shape
and count them and call the number of perimeter squares as ‘P’ .
6. Now use the formula
Area = C + (0.5) x P

16. Q)What is Density?

17. Density is the mass per unit volume of a substance or object.
In equation form density is defined as
The SI unit of density is kg/ m3.

19. Q)What is Speed?

20. The speed of a body can be calculated by dividing
the distance travelled by a body and the time
taken to travel the distance.
The SI unit of speed meter per second or m/s.

21. The speed of a car at any instant of time is shown by a
instrument called speedometer.
The distance travelled by a car is measured by another
instrument called odometer.