📘 Physics Revision – Measurement, Screw Gauge, Vernier Caliper & Pendulum
Q1. What is the name given to units that are derived from fundamental units?
Derived Units.
Q2. What is the relationship between one nanometer (nm) and one meter (m)?
1 nm = 10⁻⁹ m.
Q3. What is a quantity that has only magnitude and no direction?
Scalar Quantity.
Q4. What is the main scale reading (MSR) of a screw gauge?
The last main scale division visible before the circular scale.
Q5. What is the circular scale reading (CSR) of a screw gauge?
The circular scale division that coincides with the main scale's baseline.
Q6. What is the formula for calculating the observed reading of a screw gauge?
Observed Reading = MSR + (CSR × Least Count).
Q7. What is the formula for calculating the least count (L.C.) of a vernier caliper?
L.C. = Smallest division on main scale ÷ Number of divisions on vernier scale.
Q8. Which part of a vernier caliper is used to measure the depth of a small hole?
The strip or depth bar.
Q9. What does it mean if the zero marks of both the main scale and the vernier scale coincide?
Zero error is zero.
Q10. What is the formula for the time period of a simple pendulum?
T = 2Ï€ √(L/g).
Q11. On which two factors does the time period of a simple pendulum depend?
Length (L) and acceleration due to gravity (g).
Q12. If the length of a simple pendulum is doubled, how does its time period change?
The time period increases by a factor of √2.
Q13. What is a "second’s pendulum"?
A pendulum with a time period of 2 seconds.
