BPSC PAST PAPERS MCQS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
جب کسی گھڑی کا موسم بہار زخمی ہوجاتا ہے تو ، اس کا _____ ہوگا؟
Electrical energy
Strain energy
Kinetic energy
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Winding the spring of a watch stores strain energy in the spring due to deformation.
This energy is then gradually converted into kinetic energy to drive the watch mechanism.
Strain energy is a form of potential energy stored in elastic objects when twisted or stretched.
کسی ندی کے بہاؤ کی شرح کا تعین ______ کے ذریعہ کیا جاسکتا ہے؟
Weir
Kennison nozzle
Kundt’s tube
None of these
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Explanation
A weir is a barrier across a river used to measure the flow rate of water by observing the water height over it.
The flow rate can be calculated using empirical formulas based on the weir type and head of water .
Weirs are widely used in hydrology and water resource management for river discharge measurements.
مطلق صفر درجہ حرارت سے بالاتر تمام جسم تابکاری کا اخراج کرتے ہیں۔ مذکورہ بالا بیان ______ پر مبنی ہے؟
Wien’s law
Provost theory
Plank’s law
None of these
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Explanation
Prevost’s theory of heat exchange states that all bodies above absolute zero continuously emit and absorb radiation.
The net heat exchange depends on the difference between emitted and absorbed radiation .
At thermal equilibrium , the rate of emission equals the rate of absorption.
دھند کی تشکیل _____ کی وجہ سے ہے؟
Temperature falls of atmosphere
High pressure
Humidity
None of these
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Explanation
Fog forms when the atmospheric temperature falls to the dew point, causing water vapor to condense into tiny droplets .
This usually happens during cool, calm conditions , especially at night .
High humidity helps fog formation, but the primary cause is the fall in temperature.
گرمی کو موصل پائپ سے آس پاس کی ہوا میں منتقل کیا جاتا ہے بنیادی طور پر ______ کے ذریعہ؟
Radiation
Conduction
Free convection
None of these
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Explanation
Around an insulated pipe, heat reaches the surrounding still air mainly through natural (free) convection due to density differences in air.
Since the air is still, there is no forced movement to cause forced convection.
Radiation may also occur, but free convection is the dominant mode in this case.
تھرمل چالکتا کی اعلی قیمت ______ کے لئے متوقع ہے؟
Boiling water
Solid ice
Melting ice
None of these
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Explanation
Solid ice has a more ordered structure, allowing heat to transfer more efficiently than in liquid water.
Therefore, its thermal conductivity is higher than that of water or boiling water.
During melting , energy is used for phase change rather than heat transfer, so thermal conductivity is lower than solid ice .
سطح کی گیج ______ کے لئے استعمال ہوتی ہے؟
Check the surface finish
Layout the work accurately
Level the surface plate
None of these
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Explanation
A surface gauge is used to mark and lay out lines on workpieces with high accuracy .
It helps in checking parallelism and transferring measurements from a reference surface.
Surface gauges are commonly used along with a surface plate for precision marking work .
Absorptivity as well as transmissivity
Absorptivity
Reflectivity
None of these
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Explanation
Gases have poor absorptivity , meaning they absorb very little radiant heat.
Most gases are nearly transparent to radiation , so absorption is minimal.
Because of poor absorptivity , gases also have low emissivity , but high transmissivity .
نوزل سے باہر نکلنے پر بھاپ _______ ہے؟
Low pressure and high velocity
High pressure and low velocity
Low pressure and low velocity
None of these
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Explanation
A nozzle converts the pressure energy of steam into kinetic energy , increasing its speed.
As steam passes through the nozzle , its pressure drops while velocity increases .
This high-velocity steam is used to drive turbine blades efficiently.
پانی کا ٹرپل نقطہ _____ ہے؟
373.16k
273.16k
285.16k
300.16k
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Explanation
The triple point of water is the unique temperature and pressure at which water coexists in all three phases — solid, liquid, and gas — in equilibrium.
Temperature: 273.16 Kelvin
This is used as a fundamental fixed point in defining the Kelvin temperature scale.
