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Sections:
Aptitude
Thermo
Strength
Production
Q1. General Aptitude
If 15 workers can build a wall in 8 days, how many workers are needed to build same wall in 6 days?
Correct Answer: C
M₁D₁ = M₂D₂ → 15×8 = M₂×6 → M₂ = 20.
Q2. General Aptitude
A car travels 60 km in 1.5 hours. Its average speed is:
A. 30 km/h
B. 40 km/h
C. 50 km/h
D. 90 km/h
Correct Answer: B
Speed = 60/1.5 = 40 km/h.
Q3. General Aptitude
Choose the correct spelling:
A. Mischeivous
B. Mischievious
C. Mischievous
D. Mischevous
Correct Answer: C
Correct spelling: Mischievous.
Q4. General Aptitude
Simplify: 25 + 5 × 2 - 10
Correct Answer: C
Using BODMAS: 5×2=10, 25+10-10=25.
Q5. General Aptitude
If the radius of a circle is doubled, the area becomes:
A. Double
B. Four times
C. Eight times
D. Same
Correct Answer: B
A ∝ r². If r → 2r, A → 4A.
Q6. General Aptitude
The ratio of 3 km to 300 m is:
A. 1:10
B. 10:1
C. 10:1
D. 1:100
Correct Answer: C
3 km = 3000 m. 3000:300 = 10:1.
Q7. Thermodynamics
The SI unit of thermal conductivity is:
A. W/m
B. W/mK
C. J/kgK
D. N/m²
Correct Answer: B
Thermal conductivity k: W/(m·K).
Q8. Thermodynamics
The efficiency of Carnot cycle depends on:
A. Working fluid
B. Temperature limits
C. Pressure ratio
D. Engine size
Correct Answer: B
η = 1 - T₂/T₁ (depends only on source and sink temperatures).
Q9. Thermodynamics
In an isothermal process, which quantity remains constant?
A. Pressure
B. Volume
C. Temperature
D. Entropy
Correct Answer: C
Isothermal: T = constant, PV = constant (for ideal gas).
Q10. Thermodynamics
The unit of entropy is:
A. J/K
B. kJ/K
C. kJ/kgK
D. All of these
Correct Answer: D
Entropy units: J/K (total) or kJ/kg·K (specific).
Q11. Thermodynamics
The first law of thermodynamics is essentially:
A. Conservation of mass
B. Conservation of energy
C. Conservation of momentum
D. Law of entropy
Correct Answer: B
ΔU = Q - W (energy conservation for thermodynamic systems).
Q12. Strength of Materials
Hooke's law states that stress is proportional to:
A. Force
B. Strain
C. Area
D. Length
Correct Answer: B
Within elastic limit, σ ∝ ε (stress ∝ strain).
Q13. Strength of Materials
Poisson's ratio for most metals is about:
Correct Answer: B
Poisson's ratio for metals: 0.25-0.35 (steel ~0.3). 0.5 for incompressible.
Q14. Strength of Materials
The bending moment at a simply supported beam's center with point load P at center is:
A. PL/2
B. PL/4
C. PL/8
D. PL
Correct Answer: B
Mmax = PL/4 for simply supported beam with central point load.
Q15. Strength of Materials
The polar moment of inertia of a solid shaft of diameter D is:
A. πD⁴/32
B. πD⁴/32
C. πD⁴/64
D. πD³/16
Correct Answer: B
J = πD⁴/32 for solid shaft. (Area MOI = πD⁴/64)
Q16. Strength of Materials
A material that undergoes large deformation before fracture is called:
A. Brittle
B. Ductile
C. Elastic
D. Plastic
Correct Answer: B
Ductile materials (steel, aluminum) undergo significant plastic deformation before fracture.
Q17. Production
Which process is used to make threads on a bolt?
A. Milling
B. Drilling
C. Threading
D. Grinding
Correct Answer: C
Threading (using dies) cuts external threads on bolts and rods.
Q18. Production
TIG welding uses which electrode?
A. Consumable
B. Non-consumable tungsten
C. Copper
D. Steel
Correct Answer: B
TIG (Tungsten Inert Gas) uses non-consumable tungsten electrode.
Q19. Production
The cutting speed in a lathe is measured in:
A. RPM
B. m/min
C. mm/rev
D. mm
Correct Answer: B
Cutting speed = πDN/1000 m/min (D in mm, N in RPM).
Q20. Production
Which casting process uses a wax pattern?
A. Sand casting
B. Die casting
C. Investment casting
D. Centrifugal casting
Correct Answer: C
Investment (lost wax) casting: wax pattern coated with ceramic, melted out, metal poured.
Q21. Production
The operation of enlarging a hole is called:
A. Drilling
B. Reaming
C. Boring
D. Counter-sinking
Correct Answer: C
Boring enlarges an existing hole. Reaming gives smooth finish.
Q22. Thermodynamics
A heat engine rejects 300 J to sink while doing 200 J work. Heat supplied is:
A. 100 J
B. 300 J
C. 500 J
D. 600 J
Correct Answer: C
Q₁ = W + Q₂ = 200 + 300 = 500 J.
Q23. Strength of Materials
The modulus of rigidity relates shear stress to:
A. Normal strain
B. Shear strain
C. Volumetric strain
D. Lateral strain
Correct Answer: B
G = τ/γ (shear stress / shear strain).
Q24. Production
In orthogonal cutting, the cutting edge is:
A. Parallel to work surface
B. Perpendicular to cutting velocity
C. At 45°
D. Inclined
Correct Answer: B
Orthogonal cutting: cutting edge ⊥ to cutting velocity direction.
Q25. Thermodynamics
The COP of a refrigerator is 4. If it extracts 200 J from cold reservoir, work input is:
A. 20 J
B. 40 J
C. 50 J
D. 200 J
Correct Answer: C
COP = Q₂/W → 4 = 200/W → W = 50 J.
Q26. General Aptitude
The simple interest on ₹1000 at 5% per annum for 2 years is:
A. ₹50
B. ₹100
C. ₹200
D. ₹25
Correct Answer: B
SI = P×R×T/100 = 1000×5×2/100 = ₹100.
Q27. Strength of Materials
A steel rod of 10 mm diameter carries 31.4 kN load. Stress is:
A. 100 MPa
B. 200 MPa
C. 400 MPa
D. 314 MPa
Correct Answer: C
A = π(0.01)²/4 = 7.85×10⁻⁵ m². σ = 31400/7.85e-5 = 400 MPa.
Q28. Production
The material used for cutting tools is:
A. Mild steel
B. HSS (High Speed Steel)
C. Cast iron
D. Brass
Correct Answer: B
HSS retains hardness at high cutting temperatures (used for drills, end mills).
Q29. Thermodynamics
The Otto cycle efficiency increases with:
A. Decrease in compression ratio
B. Increase in compression ratio
C. Increase in specific heat
D. Decrease in temperature
Correct Answer: B
η = 1 - 1/r^(γ-1). Higher compression ratio → higher efficiency.
Q30. Strength of Materials
Beam deflection is maximum at:
A. Supports
B. Point of load
C. Depends on loading
D. Center always
Correct Answer: C
Deflection depends on loading type. For UDL: max at center. For point load: at load point.