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**9th Class Physics Guess Paper 2020**

**9th Physics Unit 1**

**Important Definitions**

- Physics
- Base Quantities And Derived Quantities
- Zero Error And Error Correction
- Mechanics
- Atomic Physics
- Plasma Physics
- Electromagnetism
- Nuclear Physics
- Base And Derived Units
- Least Count
- Electronic Balance
- Physical Balance

**Important Short Questions**

- Differentiate Between Mechanical Stopwatch And Digital Stopwatch
- Write In Scientific Notation. (Any Term)
- Advantages/Role Of Physics In Daily Life

**Important Long Questions**

- Rules For Identifying Significant Figures
- Screw Gauge (Uses And Functions)
- Meter Rule

**9th Physics Unit 2**

**Important Definitions**

- Translatory Motion
- Linear Motion
- Uniform Velocity
- Rest And Motion
- Random Motion
- Negative Acceleration
- Gravitational Acceleration
- Acceleration And Speed
- Distance And Displacement

**Important Short Questions**

- Name The Types Of Motion
- A Car Starts From Rest Its Velocity Becomes 20 Ms-1 In 8 Seconds. Find The Acceleration.
- Find The Acceleration That Is Produced By 20N Forces In The Mass Of 8 Kg.
- Derive 1st Equation Of Motion

**Important Long Questions**

- 2nd Equation Of Motion With The Help Of Graph
- A Cricket Ball Hit Vertically Upward Returns To The Ground After 6 Seconds. Calculate Its Velocity.
- A Train Starts From Rest With An Acceleration Of 0.5 Ms-2. Find Its Speed In Kmh-1 When It Had Moved 100 Meter.
- 3rd Equation Of Motion With The Help Of Graph
- Prove That Vf= Vi+At

**9th Physics Unit 3**

**Important Definitions**

- Momentum
- Inertia
- Law Of Conservation Of Momentum
- Centripetal Force
- Circular Motion
- Newton’s 2nd Law Of Motion
- Rolling Friction
- Sliding Friction

**Important Short Questions**

- What Is Meant By Banking Of Roads?
- Write Units Of A) Momentum B) Force
- Differentiate Between Mass And Weight
- Two Methods To Reduce Friction

**Important Long Questions**

- The Relation Between Force And Momentum
- Difference Between Mass And Weight
- Benefits And Disadvantages Of Friction And Methods To Reduce Friction
- Newton’s 1st Law Of Motion
- Newton’s 2nd Law Of Motion
- How Much Centripetal Force Is Needed To Move A Body Of Mass 0.5 Kg In A Circular Path Of Radius 50 Cm With A Speed 3 Ms-1

**9th Physics Unit 4**

**Important Definitions**

- Torque And Couple
- The Moment Arm Of Force
- Center Of Gravity
- Rigid Body
- Moment Arm
- 2nd Condition For Equilibrium
- Axis Of Rotation
- Resolution Of Vectors

**Important Short Questions**

- How Vectors Are Aded By Head To Tail Rule?
- State Princiaple Of Moments
- Differentiate Between Like And Unlike Parallel Forces
- What Is Meant By Resolution Of Force? Resolve A Force Into Its Components
- Find The Center Of Gravity Of An Irregular With The Help Of The Experiment.
- Describe The Line Of Action Of A Force

**Important Long Questions**

- A Numerical Will Come From This Chapter

**9th Physics Unit 5**

**Important Definitions**

- Law Of Gravitation
- The Force Of Gravity (Gravitational Force)
- Global Positioning System. GPS
- Field Of Force
- Artificial Satellites
- Geostationary Satellites

**Important Short Questions**

- On What Factors The Orbital Speed Of Satellites Depends?
- Uses Of Artificial Satellites
- How The Value Of “G” Varies With Altitude?

**Important Long Questions**

- Determine The Mass Of Earth Using Newton’s Law Of Gravitation

**9th Physics Unit 6**

**Important Definitions**

- Wind Energy
- Kinetic Energy
- Magma
- Fossil Fuel
- Fossils
- Potential Energy
- Unit Of Power
- Solar Cell

**Important Short Questions**

- Name The Types Of Energy
- Einstein Mass-Energy Equation
- Differentiate Between Renewable And Non-Renewable Sources Of Energy
- Name The Renewable And Non-Renewable Sources Of Energy

**Important Long Questions**

- Working And Construction Of A Nuclear Power Station
- A Numerical Will Come From This Unit (A Cyclist Does, A Machine Does Work, A Stone Of Mass 500 G, Calculate The Power Of The Pump)

**9th Physics Unit 7**

**Important Definitions**

- Hook’s Law
- Atmospheric Pressure
- Density And Its Unit
- Pascal’s Law
- Heat
- Pressure And Its Unit
- Temperature

**Important Short Questions**

- Differentiate Between Stress And Strain

**Important Long Questions**

- Explain That The Pressure Of A Liquid Increases With Depth.
- Define Young’s Modulus And Derive Its Mathematical Form.

**9th Physics Unit 8**

**Important Definitions**

- Evaporation
- Specific Heat Capacity
- Latent Hear Of Fusion
- The Internal Energy Of A Body
- Specific Heat

**Important Short Questions**

- Define The Coefficient Of Linear Thermal Expansion
- How Upper And Lower Points Are Fixed On A Thermometer?
- State Kinetic Molecular Model

**Important Long Questions**

- How Much Heat Is Required To Increase The Temperature Of 0.5 Kg Of Water From 100 C To 350 C?
- Convert 500 Celcius Into Fahrenheit
- Explain Volumetric Thermal Expansion And Derive Its Equation
- Explain Latent Heat Of Fusion And Latent Heat Of Vaporization And Write Its Formulae

**9th Physics Unit 9**

**Important Definitions**

- Conduction
- Greenhouse Effect
- Radiation
- Thermal Conductivity
- Convection Currents

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