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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
آئرن میں ______ ہونے کی انوکھی خصوصیت ہے؟
- Ferroelectric
- Dielectric
- Ferromagnetic
- None of these
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Explanation
Iron exhibits strong magnetic properties and can be permanently magnetized.
This property makes it essential for transformers, motors, and magnetic storage devices.
Iron is uniquely ferromagnetic among common metals.
وائر ڈرائنگ کے عمل کے لیے کام کرنے والا مواد کیسا ہونا چاہیے؟
- Resilient
- Ductile
- Tough
- None of these
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Explanation
Wire drawing requires materials that can undergo large plastic deformation without breaking.
Ductile materials like copper, aluminum, and mild steel are ideal for wire drawing.
Ductility is essential for wire drawing operations.
اسٹریس-اسٹرین وکر کے نیچے کا رقبہ کس چیز کی نمائندگی کرتا ہے؟
- Energy required to cause failure
- Breaking strength of material
- Toughness of material
- None of these
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Explanation
The area under the stress-strain curve measures the total energy a material can absorb before fracture.
It combines both strength and ductility of the material.
Toughness = energy absorption before failure.
کسی مواد کا بغیر قابلِ ذکر تبدیلی کے ٹوٹنے کا رجحان کیا کہلاتا ہے؟
- Toughness
- Plasticity
- Brittleness
- None of these
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Explanation
Brittle materials break suddenly under stress with very little plastic deformation.
Examples include glass, ceramics, and cast iron.
Brittleness = fracture with minimal deformation.
ایلاسٹیسٹی کا ماڈیول کس چیز کے تناسب کے طور پر تعریف کیا جاتا ہے؟
- Axial stress to volumetric strain
- Axial stress to lateral strain
- Axial stress to axial strain
- None of these
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Explanation
Modulus of elasticity (Young’s modulus) measures a material’s stiffness under tensile or compressive stress.
It is the ratio of stress applied along the axis to the resulting strain in the same direction.
Modulus of elasticity = Axial stress / Axial strain.
کسی جسم کا مومنٹ آف انرشیا کس چیز پر منحصر نہیں ہوتا؟
- Angular velocity of the body
- Shape of the body
- Axis of rotation of the body
- None of these
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Explanation
Moment of inertia (MOI) depends on the mass of the body, its shape, and the axis of rotation.
Angular velocity affects kinetic energy but does not influence MOI.
MOI is independent of the body’s angular velocity.
- Rest
- Motion
- Velocity
- Inertia
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Explanation
Newton's first law of motion defines inertia. It states that an object at rest stays at rest,
And an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced external force.
This tendency of an object to resist changes in its state of motion is called inertia.
کسی مواد کی تھکاوٹ کی طاقت کو بڑھانے کے لئے مندرجہ ذیل میں سے کون سا عمل اپنایا نہیں جاتا ہے؟
- Better surface condition
- Cold working
- Hot working
- Shot peening
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Explanation
Fatigue strength is improved by surface treatments, cold working, or shot peening, which induce compressive stresses.
Hot working, on the other hand, does not enhance fatigue strength and may even reduce it by softening the surface.
Hot working does not increase fatigue strength.
- A metallic alloy
- A composite material
- A ceramic material
- None of these
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Explanation
Silica (SiO₂) is a naturally occurring oxide with high melting point and hardness.
It is widely used in glass, ceramics, and refractory applications.
Silica is classified as a ceramic material.
فوڈ پروسیسنگ مشینری کی تیاری کے لئے استعمال شدہ مصر کو منتخب کریں؟
- Pewter
- Monel metal
- Alenco
- None of these
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Explanation
Monel metal is highly resistant to corrosion, especially from acids and alkalis, making it suitable for food processing equipment.
Its durability and resistance to wear ensure long-lasting performance in industrial machinery.
Monel is preferred in food machinery due to excellent corrosion resistance.
