Class 9 Physics Ch 1
Important easy to understand Notes of Class 9 Physics Ch 1 English Medium written by Professor Sulman Arif Suib. These notes are very helpful in the preparation of Physics for students of the 9th class Physics English Medium and these are according to the paper patterns of all Sindh Book Boards.
Summary and Contents:
Topics which are discussed in the notes are given below:
- Define Physics. Name the branches of Physics.
- Define the branches of Physics: (1) Mechanics (2) Thermodynamics (3) Electricity (4) Magnetism (5) Atomic Physics (6) Optics (7) Sound (8) Nuclear Physics (9) Particle Physics (10) Astrophysics (11) Plasma Physics (12) Geophysics.
- Give some importance of Physics.
- Define fundamental physical quantities. How many fundamental physical quantities are there? Name them also give their unit and symbol.
- Define derived physical quantities. Name some derived physical quantities also give their unit and symbol.
- Define standard length.
- What is the vernier Caliper?
- What is the screw gauge?
- What is the physical balance?
- What is the prefix? List some prefixes.
- What is the density?
- What is the significant figure? Discuss the rules for significant figures.
- Solved Numerical of the exercise Class 9 Physics Ch 1.
- What is the mass of a solid iron wrecking ball of radius 18cm. If the density of iron is 7.8gm/cm3?
- What is the mass of a solid iron wrecking ball of radius 6cm. If the density of iron is 12.2gm/cm3?
- Convert mass of Sun 2 000 000 000 000 000 000 000 000 000 000 kg. into Scientific Notation.
- Convert velocity of light in 3 000 000 00 m/s. into Scientific Notation.
- How many significant figures are there in the base area of a cylinder whose diameter is 5 cm.
- How many significant figures are there in the base area of a cylinder whose diameter is 7 cm.
- A wooden piece is made in different shapes take length (I) = radius (r) = 2m. Calculate its volume as a: (i) square (ii) cube (iii) cylinder (iv) pyramid.
- Find the density of wood as sphere and cube if the mass of wood is 1 Kg. Is there any change in density due to shape.