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Class IX (Science)
Physics Solved Model paper 2023
Solved By Sir Wasim Ahmad
SOLVED MODEL PAPER
SECTION "B" (40%)
SHORT ANSWER QUESTIONS (24 Marks)
Note: Answer any eight (8) questions from this section. Each carries 3 marks.Q.2: Define significant figure. Determine the number of significant figure in:
(i) 1.33 (ii) 0.0012 (iii) 7.00 (iv) 0.00101
Ans: Significant figure:
The members of reliably known digits in a value are known as significant figure.
| Value | Significant Figure |
|---|---|
| 1.33 | 3 |
| 0.0012 | 2 |
| 7.00 | 3 |
| 0.00101 | 3 |
Q.3: Write down three difference between Speed and Velocity.
Ans: Difference Between Speed And Velocity:
| Speed | Velocity | |
|---|---|---|
| Definition | Distance covered by an object in a unit time is called speed. | Rate of change of displacement with respect to time is called velocity. |
| Formula | v = S/t | ν = Δd/t |
| Nature | It is a scalar quantity | It is a vector quantity |
| Unit | The SI unit is meter per second (m/s) | The SI unit is meter per second (m/s) |
Q.4: State Newton's second law of motion. Show the relationship between applied force and the acceleration produced in the body.
Ans: Second Law Of Motion:
Definition:
When a force acts on a body it produces acceleration in the direction of force. The acceleration is directly proportional to force and inversely proportion to mass of body.
Mathematically:
If "F" is a force applied on a body of mass "m" which produces an acceleration "a" is the body then
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