UAF ENTRY TEST PAST PAPER 16-07-2021 B
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
Gorgios
James
Mananas
Terbut
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Explanation
In Lord Dunsany’s short story “The Reward,” Gorgios was selected as the court acrobat. He spent over sixty years pursuing this ambition and eventually entered politics to create and fill the position himself . Last verified on 20-09-2026
جب سفید روشنی کسی پرزم سے گزرتی ہے تو یہ کتنے رنگوں میں تقسیم ہو جاتی ہے؟
7
8
2
4
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Explanation
When white light passes through a prism , it splits into 7 colors , forming a spectrum known as a rainbow :
Red Orange Yellow Green Blue Indigo Violet The separation of visible light into its different colours is known as dispersion.
Last verified on 08-06-2026
جب روشنی پرزم سے گزرتی ہے تو _____ سپیکٹرم بنتا ہے۔
Refraction
Reflection
Diffraction
None of these
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Explanation
Refraction : Bending of light when it passes from one medium to another. A prism bends light at different angles depending on wavelength. This separation of colors is called dispersion , forming a spectrum. Visible spectrum colors : Red, Orange, Yellow, Green, Blue, Indigo, Violet ( ROYGBIV ). Last verified on 13-03-2026
پروٹون اور نیوٹران کو اجتماعی طور پر _____ کہا جاتا ہے؟
Nucleotides
Nucleons
Isotopes
Positrons
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Explanation
Protons and neutrons form the nucleus of an atom. Together, they are called nucleons because they are nuclear particles. Additional information :
Nucleons determine the mass of an atom. Isotopes are atoms of the same element with different number of neutrons. Last verified on 07-03-2026
پی قسم کے مواد/سیمی کنڈکٹر میں ______ اکثریت کیریئر ہے۔
Proton
Electron
Atoms
Holes
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Explanation
The majority carriers in a p-type semiconductor are holes.
When a semiconductor material is doped with trivalent impurity atoms (like Boron), it creates "holes" where electrons are missing, effectively giving a positive charge.
These holes then become the majority charge carriers, meaning they are the primary contributors to electrical current flow in the material.
8.314 × 10⁷
8.314 × 10⁷
2.314
None of these
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Explanation
The gas constant R in ergs mol⁻¹ K⁻¹ is 8.314 × 10⁷ . It is derived from the SI value 8.314 J mol⁻¹ K⁻¹ , where 1 J = 10⁷ ergs.
سب سے لمبی طول موج کس کی ہے؟
Blue
Yellow
Red
None of these
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Explanation
Red light rays have the lowest frequency and highest wavelength value.
Blue or violet light has the shortest wavelength.
ٹرانسفارمر کا اصول _____ ہے؟
Mutual induction
Ampere's law
Motional e.m.f
None of these
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Explanation
A transformer works on the principle of mutual induction , where a changing current in the primary coil induces a voltage in the secondary coil. This is based on Faraday's Law of Electromagnetic Induction , which states that a changing magnetic field produces an electromotive force (emf).
Power
Angular momentum
Intensity
Momentum
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Explanation
The dimensions of Planck's constant are the same as those of angular momentum.
Planck's constant (h) is a fundamental constant in quantum mechanics
It relates the energy (E) of a photon to its frequency (ν) through the equation E = hν.
The dimensions of Planck's constant can be derived from this relationship,
And they are found to be the same as those of angular momentum
Energy
Motion
Force
Momentum
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Explanation
The capacity of an object to do work is called energy .
Energy can take many forms and is defined as the capacity a system or object has to perform work.
