ICSE Worksheet for chapter-1 Estimation and units class 9

Worksheet For class 9

Find ICSE Worksheet for chapter-1 Estimation and units class 9

CLASS-9

BOARD: ICSE

Physics Worksheet - 1

TOPIC: Estimation and units

For other ICSE Worksheet for class 9 Science check out main page of Physics Wallah.

SUMMARY

• Estimation by order of magnitude, Need of unit for measurement, Systems of unit
• Units of mass, Units of time, Examples of derived units
• Guidelines for writing the units

SECTION 1 – OBJECTIVE

SECTION II - SUBJECTIVE

1. 1AU (Angstrom unit) is equal to
   1. (A) 0.1nm
   2. (B) 10cm
   3. (C) 10^-8m
   4. (D) 10^-4µ
2. If the size of bacteria is 1µm, then the number of bacteria in 1m length is
   1. 10³
   2. 10⁴
   3. 10⁵
   4. 10⁶
3. Find the order of magnitude of mass of the moon if its radius is 310⁶m and average density is
   10³kg/m³
   1. 10³
   2. 10¹²
   3. 10²²
   4. NOT
4. Which of the following is the unit of force?
   1. Kg.m/s²
   2. g.cm/s²
   3. Newton
   4. All of these
5. 1 quintal is equal to
   1. 100 kg
   2. 1000kg
   3. 10⁶kg
   4. 10¹²kg
6. The time in which the moon completes 1 revolution around the earth is called
   1. Solar day
   2. Lunar month
   3. Leap year
   4. NOT
7. 1 century is of
   1. 100 years
   2. 36524days
   3. Both a & b
   4. NOT
8. 1 Fermi is equal to ………….m
   1. 10^-6
   2. (B) 10⁶
   3. (C) 10^-15
   4. (D) 10¹⁵
9. The derived unit of pressure is
   1. Kg.m/s
   2. Kg.m/s²
   3. Kg/m-s²
   4. Kg.m.s
10. 1 light year is the unit of
    1. Mass
    2. Distance
    3. Time
    4. Force
11. Define the following
    1. Measurement
    2. Standard metre
    3. leap year
    4. one second
12. Light year is not a unit of time Explain.
13. Complete the following table
    1. 1g = ………kg
    2. 1mg = …….kg
    3. 1amu = ………..kg
14. It takes time 8min for light to reach from sun to the earth surface. If the speed of light is taken to be 3x10⁸m/s, find the order of magnitude of distance of sun from earth in Km.
15. The thickness of a metal sheet is measured to be 3.36mm. Express its order of magnitude in:
    1. mm
    2. m

    Solutions: to worksheet-1 Estimation and units class 9

    Objective Problems:

    1. (A)

    2. (D)

    3. (C)

    4. (D)

    5. (A)

    6. (B)

    7. (C)

    8. (C)

    9. (C)

    10. (B)