IBA STS 25 YEARS PAST PAPERS SUBJECT WISE (SOLVED)
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
مندرجہ ذیل میں سے کون سی آنکھ میں لینس کی شکل بدلنے میں مدد کرتا ہے؟
- Ciliary Muscles
- Extraocular Muscles
- Iris Muscles
- Conjunctiva Muscles
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Explanation
Ciliary muscles adjust the curvature of the lens to focus on near or distant objects.This process is called accommodation in the human eye.
دو دھاتی پٹی _____ میں استعمال ہوتی ہے؟
- Electric fan
- Electric motor
- Electric iron
- Electric toaster
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Explanation
A bimetallic strip bends with heat due to different expansion rates of two metals.It is used in electric irons as a thermal switch to regulate temperature.
جس میں توسیع اور سکڑاؤ کا استعمال نہیں ہوتا؟
- A thermometer
- An electric iron
- A railway track
- An electric fan
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Explanation
Electric fans work using a motor, not by expansion or contraction of materials.Devices like thermometers, electric irons, and railway tracks rely on thermal expansion and contraction.
ہائیڈرولک پاور سسٹم میں کون سا سیال استعمال ہوتا ہے؟
- Water
- Oil
- Non-compressible fluid
- All of these
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Explanation
Hydraulic power systems use fluids to transmit power and motion, and the most common fluids used are:
- Water (in hydraulic systems like water supply networks, fire suppression systems, and hydroelectric power plants)
- Oil (in hydraulic systems like heavy machinery, construction equipment, and industrial manufacturing)
- Non-compressible fluids (like hydraulic fluids, brake fluids, and transmission fluids) that are specifically designed for hydraulic systems.
وہ مقداریں جن کی دوسری مقداروں کے لحاظ سے وضاحت نہیں کی جا سکتی ____ کے نام سے جانا جاتا ہے؟
- Derived physical quantities
- Mathematical quantities
- Fundamental physical quantities
- None of these
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Explanation
Fundamental quantities are basic and independent, like mass, length, and time.They cannot be defined in terms of other physical quantities.
زمین کے اندرونی ڈھانچے کے مطالعہ کو _____ کہا جاتا ہے؟
- Geophysics
- Astrophysics
- Thermodynamics
- None of these
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Explanation
Geophysics is the science that studies the internal structure and physical properties of the Earth.
It includes the study of earthquakes, magnetic and gravitational fields, and Earth's interior layers.
- {2,−2}
- {2,0}
- {−1,2}
- None of these
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Explanation
To solve |3x| = 6:
3x = 6 or 3x = -6
x = 2 or x = -2
- Tangent
- Chord
- Secant
- None of these
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Explanation
A chord is a line segment with both endpoints on the circle.
Unlike a secant, it does not extend outside the circle.
- n × p
- m × p
- p × n
- None of these
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Explanation
When multiplying matrices A (order m × n) and B (order n × p), the resulting matrix has an order of m × p.
- 30 to 40
- 50 to 60
- 90 to 100
- None of these
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Explanation
50 to 60:
Increase = 60 - 50 = 10
Percent increase = (10 / 50) × 100 = 20%
