Class 11th Physics Unit - Class 12 UP Board Physics

Units and Measurements

Physical Quantities and Their Types Physical quantities are those properties of objects or phenomena that can be measured. Only measurable attributes like length, mass, time, temperature, etc., are considered physical quantities, while non-measurable attributes like love or anger are not. Physical quantities are further classified...

Which of the following is a physical quantity according to the transcript?

Length of a pen

What is the SI unit used to represent the intensity of light?

Candela

Which of the following is a physical quantity according to the transcript?

Length of a pen

What is the SI unit used to represent the intensity of light?

Candela

What is the formula for calculating the total reading from a screw gauge?

$Total Reading = MSR + (Circular Scale Division \times LC)$ — where MSR is the Main Scale Reading, Circular Scale Division is the number of the circular scale division that aligns with the main scale line, and LC is the Least Count of the instrument.

How is the Circular Scale Reading (CSR) contribution calculated in a screw gauge measurement?

The Circular Scale Reading (CSR) contribution is calculated by identifying the circular scale division that aligns perfectly with the main scale line and then multiplying this division number by the instrument's Least Count (LC). For example, if the 20th division aligns and LC = 0.01, the contribution is $20 \times 0.01$.