BPSC PAST PAPERS MCQS
فری تیاری کیلے وٹس ایپ
گروپ جوائن کریں
Click here
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
پرچی اور رینگنے کا مشترکہ اثر ____ سے زیادہ نہیں ہونا چاہئے؟
- 4%
- 1.5%
- 2.5%
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
In belt drives, slip and creep cause a reduction in velocity ratio between driver and driven pulleys.
For efficient power transmission, their combined effect is usually limited to about 4%.
Slip + creep together should not exceed 4% in belt drives.
ریویٹس کو عام طور پر کس بنیاد پر مخصوص کیا جاتا ہے؟
- Shape of head
- Diameter of head
- Diameter of shank
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Rivets are specified mainly by the diameter of their shank, which determines strength and load-carrying capacity.
Length is selected separately based on plate thickness and head formation.
Rivet size is identified by shank diameter.
کے عمل سے اسٹیل کو جلدی سے سخت کیا جاسکتا ہے؟ _____
- Carbonizing
- Induction hardening
- Nitriding
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Induction hardening uses high-frequency alternating current to heat the steel surface rapidly.
Immediate quenching produces a hard surface layer in a very short time.
Induction hardening is the fastest surface-hardening process.
کاربن اسٹیل میں ، سلفر کی تھوڑی مقدار میں موجودگی میں ____ بہتر ہوتا ہے؟
- Machinability
- Weldability
- Formability
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
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
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Brittle materials break suddenly under stress with very little plastic deformation.
Examples include glass, ceramics, and cast iron.
Brittleness = fracture with minimal deformation.
