BPSC ASSISTANT ENGINEER PAST PAPER 14-04-2025
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
کاربن اسٹیل میں ، سلفر کی تھوڑی مقدار میں موجودگی میں ____ بہتر ہوتا ہے؟
- Machinability
- Weldability
- Formability
- None of these
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Explanation
Sulphur forms manganese sulphide inclusions that act as chip breakers during machining.
This reduces cutting resistance and tool wear.
Sulphur is added to carbon steel to improve machinability.
- Resilient
- Tough
- Wear resistant
- None of these
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Explanation
Cast iron contains graphite, which provides good resistance to wear and abrasion.
It is commonly used in machine beds, cylinders, and pipes where wear resistance is required.
Cast iron is known for excellent wear resistance but low ductility.
دھماکے کی بھٹی سے سلیگ ______ پر مشتمل ہے؟
- Calcium and ferrous silicates
- Aluminum and ferrous silicates
- Calcium and aluminum
- None of these
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Explanation
In a blast furnace, limestone decomposes to form calcium oxide, which reacts with silica to form calcium silicate slag.
This slag floats over molten iron and removes impurities efficiently.
Blast furnace slag is mainly composed of calcium silicates.
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.
