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General Aptitude : A number is divisible by both 3 and 5. What is the smallest such number above 10 ?
  • 25
Explanation: LCM of 3 and 5 = 15. First multiple after 10 = 15
General Aptitude : Find the value of (3² + 4²).
  • 20
  • 22
  • 25
  • 27
Explanation: 3² = 9, 4² = 16 9 + 16 = 25
Mechanical Engineering : Hooke’s Law states:
  • Stress is proportional to strain
  • Force is proportional to area
  • Strain is proportional to pressure
  • Stress is constant for all materials
Explanation: Hooke’s Law states that : Stress (σ) = E × Strain (ε) Where: σ = stress ε = strain E = Young’s modulus (material constant) This law holds within the elastic limit of a material.
What is the unit of viscosity ?
  • Newton-meter
  • Joule-second
  • Pascal-second
  • Watt
Explanation: The SI unit of dynamic viscosity is Pascal-second (Pa·s). It measures the resistance to flow in fluids. Other common unit (non-SI): Poise (P), where 1 Pa·s = 10 Poise.
Which cycle is used in internal combustion engines?
  • Rankine cycle
  • Otto cycle
  • Carnot cycle
  • Diesel cycle
Explanation: The Otto cycle is the ideal thermodynamic cycle used in petrol (spark-ignition) internal combustion engines. It involves 4 steps: Isentropic compression Constant-volume heat addition Isentropic expansion Constant-volume heat rejection
Mechanical Engineering : Which of the following is not a thermodynamic process?
  • Isothermal process
  • Adiabatic process
  • Isobaric process
  • Metallic bonding
Explanation: Isothermal, adiabatic, and isobaric are all types of thermodynamic processes involving heat, pressure, or temperature changes in a system. Metallic bonding is a type of chemical bond found in metals — not a thermodynamic process.
Mechanical Engineering : In which process does heat transfer occur due to fluid motion?
  • Conduction
  • Radiation
  • Convection
  • Reflection
    • Explanation: Convection is the transfer of heat through the movement of fluids (liquids or gases). Hot fluid rises and cooler fluid sinks, creating a flow that carries heat.