Arithmetic
MPSC - Rajyaseva Paper 1 — Quantitative Aptitude
2-min read·8 key concepts·8 facts
AI-Powered Analysis
8
PYQs Analyzed
2021–2023
Years Covered
Paper 1
MPSC - Rajyaseva
This subtopic covers fundamental arithmetic operations, unit conversions, and basic chemistry calculations. It is crucial for solving numerical problems in the MPSC exam.
Key Concepts
Mole Fraction
Ratio of moles of one component to total moles in a mixture.
pH Calculation
Determines acidity using negative logarithm of hydrogen ion concentration.
Solution Preparation
Involves dilution and concentration calculations using molarity.
Hydrocarbon Composition
Calculates percentage composition of elements in compounds.
Wave Speed
Speed = frequency × wavelength; used to find distance traveled.
Current and Voltage
Ohm's Law relates current, voltage, and resistance.
Temperature Conversion
Formula to convert Fahrenheit to Celsius.
Unit Conversion
Converts between different units of measurement.
Must-Know Facts
- 1Molar mass of methane is 16 g/mol.
- 2Oxygen molar mass is 32 g/mol.
- 3pH = -log[H+]; HCl is strong acid.
- 41.0N H2SO4 requires 49 g/L.
- 5Benzene has 80% carbon by mass.
- 6Sound speed = 1000 Hz × 0.25 m = 250 m/s.
- 7Ohm's Law: V = IR.
- 8Fahrenheit to Celsius: (°F - 32) × 5/9.
Exam Patterns
Numerical calculations are common.
Unit conversion questions are frequent.
Chemistry-based problems test molar ratios.
Physics problems involve formulas like wave speed.
Temperature conversion is a standard question.
Common Traps
Confusing molarity with normality in solution preparation.
Forgetting to apply negative sign in pH calculation.
Mixing up mole fraction with mass fraction.
Incorrectly using Fahrenheit to Celsius formula.
Overlooking significant figures in calculations.
Year Highlights
2023Multiple chemistry and physics questions tested molarity, pH, and wave speed.
2022Focused on wave speed and Ohm's Law applications.
2021Mole fraction calculation was a key question.
Practice these PYQs
Test yourself with the actual 8 questions on Arithmetic