Q1. Ultrasonic waves किस प्रकार उत्पन्न की जाती हैं?
(a) Electromagnetic effect
(b) Piezoelectric effect
(c) Hall effect
(d) Seebeck effect
✅ Answer: (b) Piezoelectric effect

Ultrasonic test में defect का पता कैसे लगाया जाता है?
(a) Defect पर wave absorb हो जाती है
(b) Defect से wave reflect होती है
(c) Defect wave को refract करता है
(d) Defect कोई असर नहीं डालता
✅ Answer: (b) Defect से wave reflect होती है

. इस विधि में न्यूनतम detect होने वाली दरार कितनी हो सकती है?
(a) 1% probe दूरी
(b) 0.1 mm
(c) 0.1% probe से दूरी
(d) 1 mm
✅ Answer: (c) 0.1% probe से दूरी

(1) In ultrasonic testing, the waves used are:
(a) Infrared waves
(b) X-rays
(c) High-frequency sound waves
(d) Gamma rays

(7) Damping test is primarily used to:
(a) Measure heat transfer
(b) Detect vibration level only
(c) Detect cracks through vibration absorption changes
(d) Measure tensile strength

✅ Correct Answer: (c) Detect cracks through vibration absorption changes

(8) Which of the following gives real-time monitoring for fatigue crack?
(a) X-ray
(b) Magnetic particle
(c) Electrical method
(d) Damping test

✅ Correct Answer: (c) Electrical method

Q1. Mechanical properties को सबसे अच्छा कैसे जाना जा सकता है?
(a) Theoretical analysis से
(b) Structure bonding से
(c) Mechanical testing से
(d) केवल chemical composition से
✅ Answer: (c) Mechanical testing से

Q2. Fatigue test से कौन सी property मापी जाती है?
(a) Shear strength
(b) Hardness
(c) Material का व्यवहार repeated load में
(d) Shock loading में toughness
✅ Answer: (c) Material का व्यवहार repeated load में

Q4. Creep test किस स्थिति में किया जाता है?
(a) Instant load के लिए
(b) High frequency load के लिए
(c) Static load over long time
(d) Repeated tensile loading
✅ Answer: (c) Static load over long tim

Q. What does the impact test of a material measure?

(a) Yield strength
(b) Hardness
(c) Toughness
(d) Elasticity

✅ Correct Answer: (c) Toughness

1. In the Izod impact test, the specimen is:
(a) Simply supported
(b) Fixed at both ends
(c) Held as a cantilever
(d) Freely suspended

✅ Answer: (c) Held as a cantilever

Q2. In Charpy test, the notch is:
(a) On the top surface
(b) On the side of striking face
(c) Opposite to the striking face
(d) In the middle but parallel to load

✅ Answer: (c) Opposite to the striking face

The formula to calculate impact energy in a pendulum type machine is:
(a)
𝑊
𝑅
cos
⁡
𝜃
WRcosθ
(b)
𝑊
𝑅
(
1
−
cos
⁡
𝜃
)
WR(1−cosθ)
(c)
𝑊
𝑅
(
1
+
cos
⁡
𝜃
)
WR(1+cosθ)
(d)
𝑊
𝑅
cos
⁡
𝜃
cosθ
WR
​


✅ Answer: (b) WR (1 - cos θ)

The size of standard test specimen in Charpy and Izod test is:
(a) 10 × 10 × 100 mm
(b) 10 × 10 × 50 mm
(c) 10 × 10 × 75 mm
(d) 12 × 12 × 75 mm

✅ Answer: (c) 10 × 10 × 75 mm

. In Charpy impact test, energy absorbed is calculated using:
(a) Load × time
(b) Height of specimen × velocity
(c)
𝑊
𝑅
(
cos
⁡
𝛽
−
cos
⁡
𝛼
)
WR(cosβ−cosα)
(d) Mass × acceleration × displacement
✅ Answer: (c)
𝑊
𝑅
(
cos
⁡
𝛽
−
cos
⁡
𝛼
)
WR(cosβ−cosα)

Q2. What is the effect of sharp notch on impact strength?
(a) Increases energy required
(b) No change
(c) Decreases energy required
(d) Increases ductility
✅ Answer: (c) Decreases energy required

1. What is the magnification used to measure indentation in Brinell test?
(a) 10x
(b) 50x
(c) 70x
(d) 100x
✅ Answer: (c)

Q1. Which of the following metal structures is more susceptible to ductile-brittle transition?
(a) FCC
(b) HCP
(c) BCC
(d) Amorphous
✅ Answer: (c) BCC

Q3. The ductile to brittle transition temperature is associated with:
(a) Increase in impact energy
(b) Increase in yield stress and sudden drop in elongation
(c) Increase in corrosion resistance
(d) Transition from BCC to FCC
✅ Answer: (b)