9TH PHYSICS 20 MOST IMPORTANT LONG QUESTIONS

 

20 MOST IMPORTANT LONG QUESTIONS.

UNIT -1

1. A Chocolate wrapper is 6.7 cm long and 5.4 cm wide. Calculate its area up to a reasonable number of significant figures. 

2. Your hair grows at their of 1 mm per day Find its growth rate in nm s-1

UNIT -2

1. Prove with the help of graph Vf = Vi + at 

2. Derive the Second equation. 

3. Derive the equation of motion with the help of a speed-time graph.

UNIT - 3

1. Write the advantages and disadvantages of friction. 

2. Problem: 3.8, 3.10

UNIT - 4

1. Define torque or moment of force. Explain on what factors does it depend on? 

2. State and explain in conduction for equilibrium. 

3. Problem: 4.9

UNIT - 5

1. Determine the mass of the earth using the law of gravitation. 

2. Derive the equation of motion of artificial satellites. 

UNIT - 6

1. Write the four uses of solar energy. 

2. Explain electrical energy and sound energy. 

3. Example No. 6.7 :Problem: 6.6

UNIT - 7

1. Problem: 7.9 

2. State Pascal’s law and explain the hydraulic press

UNIT - 8

1. Define linear thermal expansion in solids. Derive its formula. 

2. Problem: 8.3

UNIT - 9

1. Define Specific heat. How would you find the specific heat of a solid?

:::GOOD LUCK:::