MCQs in board exams are mostly based on these topics:

1. Physical Quantities

• The SI unit of length is: (Meter)

• The SI unit of mass is: (Kilogram)

• The SI unit of time is: (Second)

• The SI unit of temperature is: (Kelvin)

• The SI unit of electric current is: (Ampere)

2. Derived Units

• The unit of force is: (Newton)

• The unit of work is: (Joule)

• The unit of power is: (Watt)

• The unit of pressure is: (Pascal)

• The unit of frequency is: (Hertz)

3. Dimensional Analysis

• The dimensions of velocity are: ([L T⁻¹])

• The dimensions of acceleration are: ([L T⁻²])

• The dimensions of force are: ([M L T⁻²])

• The dimensions of work are: ([M L² T⁻²])

• The dimensions of power are: ([M L² T⁻³])

• The dimensions of pressure are: ([M L⁻¹ T⁻²])

4. Homogeneity of Equations

• A dimensionally correct equation is always correct: (False)

• A dimensionally correct equation may or may not be correct: (True)

• The dimensions on both sides of a correct equation must be: (The same)

5. Accuracy and Precision

• Accuracy means: (Near to the true value)

• Precision means: (Consistency of measurements)

• A precise measurement is always accurate: (False)

• An accurate measurement is always precise: (False)

6. Uncertainty and Errors

• All measurements contain: (Uncertainty)

• Uncertainty is due to: (Limitations of measuring instruments)

• Absolute uncertainty is expressed: (In the same units as the measured quantity)

• Percentage uncertainty is: (Absolute uncertainty / measured value × 100)

7. Scientific Notation

• 0.00035 in scientific notation is: (3.5 × 10⁻⁴)

• 3500000 in scientific notation is: (3.5 × 10⁶)

• 1.5 × 10³ in decimal is: (1500)

8. Significant Figures

• The number 0.00450 has: (3 significant figures)

• The number 4500 has: (4 or 2 significant figures depending on notation)

• The number 4500. has: (4 significant figures)

• The number 4.500 has: (4 significant figures)

9. SI Conventions

• Unit symbols are written in: (Lowercase except for named scientists)

• The symbol for kilogram is: (kg)

• The symbol for second is: (s)

• The symbol for ampere is: (A)

10. Prefixes

• Kilo (k) means: (10³)

• Mega (M) means: (10⁶)

• Giga (G) means: (10⁹)

• Milli (m) means: (10⁻³)

• Micro (µ) means: (10⁻⁶)

• Nano (n) means: (10⁻⁹)

• Pico (p) means: (10⁻¹²)

11. Combining Uncertainties

• When adding quantities, uncertainties are: (Added)

• When subtracting quantities, uncertainties are: (Added)

• When multiplying quantities, fractional uncertainties are: (Added)

• When dividing quantities, fractional uncertainties are: (Added)