1st Year Physics Chapter 1 Test01. Physical Quantities & Measurement

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Dimension of universal gravitational constant is.
   1. [M⁻²L³T⁻²]
   2. [M³L⁻¹T⁻²]
   3. [M⁻¹L³T⁻²]
   4. [M⁻³L³T⁻²]
2. The diameter of the Earth is approximately:
   1. 10⁹ m
   2. 10⁷ m
   3. 10¹² m
   4. 10⁴ m
3. Which of the following is a dimensional variable?
   1. Angle
   2. Strain
   3. Length
   4. Coefficient of friction
4. The mean diameter of a wire is found to be (0.50±0.02) mm. The percentage uncertainty in the diameter is.
   1. 0.02
   2. 0.04
   3. 0.06
   4. 0.08
5. Dimensional analysis cannot be used to derive formulas involving:
   1. Logarithms
   2. Velocity
   3. Acceleration
   4. Force
6. The difference between true value and observed value is called:
   1. Uncertainty
   2. Precision
   3. Error
   4. Accuracy
7. Accuracy refers to how closely:
   1. Measurements agree with each other
   2. A measurement matches a true value
   3. Values repeat
   4. The least count is large
8. Newton can be expressed in base units as:
   1. kg m² s⁻²
   2. kg m s⁻²
   3. N m⁻²
   4. A s
9. The time period of a pendulum is dimensionally proportional to:
   1. √(l/g)
   2. g/l
   3. l²/g
   4. g²/l
10. Accuracy is indicated by:
    1. Least count
    2. Absolute uncertainty only
    3. Fractional or percentage uncertainty
    4. Repeated measurements