IBA STS MDCAT PAST PAPER 08-12-2024
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
Toward Charge C
Toward Charge B
Toward Charge A
None of these
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Explanation
Since the resultant force on charge A is 0.024 N, and charge A is positive, the force must be attractive.
Charge C is negative, so the force due to charge C on charge A is attractive.
Therefore, the resultant force is toward charge C.
خلا میں روشنی کی رفتار تمام مبصرین کے لیے یکساں ہے قطع نظر ان کی نسبتی حرکت یا روشنی کے منبع کی حرکت _______ کا ایک اہم مؤقف ہے؟
Special theory of relativity
Special conductivity
Special resistivity
None of these
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Explanation
This postulate, proposed by Einstein , is a cornerstone of the Special Theory of Relativity. It states that the speed of light in a vacuum is constant ( approximately 3 × 1 0 8 3 times 10^8 and independent of the observer's or source's motion.
جلد کا کینسر ______ کی وجہ سے ہو سکتا ہے؟
Alpha radiation
Beta radiation
Ultraviolet radiation
None of these
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Explanation
Skin cancer is primarily caused by overexposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. UV radiation damages DNA in skin cells. This leading to mutations that can result in cancer .
مندرجہ ذیل میں سے کون سی برقی مقناطیسی تابکاری سب سے زیادہ گھسنے والی طاقت رکھتی ہے؟
Gamma rays
Alpha rays
Beta rays
None of these
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Explanation
Gamma rays have the highest penetrating power. Due to their high energy and lack of charge. It allowing them to pass through most materials. In comparison, alpha particles have the least penetration. Beta particles have moderate penetration.
20gm
5gm
2.5gm
None of these
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Explanation
After 1 half-life (20 days), the amount left is 40/2 = 20gm. After 2 half-lives (40 days), the amount left is 20/2 = 10gm.
After 3 half-lives (60 days), the amount left is 10/2 = 5gm.
After 4 half-lives (80 days), the amount left is 5/2 = 2.5gm .
جب ایک نیوکلئس سے دو منفی بیٹا ذرات خارج ہوتے ہیں تو ماس نمبر _____؟
Increases by 2
No change
Increases by 3
None of these
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Explanation
The emission of two negative beta particles (electrons) does not affect the mass number since it involves the conversion of neutrons to protons without changing the total number of nucleons. The mass number remains unchanged because the emission of beta particles only affects the atomic number, not the mass number.
نیوکلئس کو باندھنے کی ذمہ دار قوت ______ ہے؟
Coulomb’s force
Newton force
Strong Nuclear force
None of these
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Explanation
The strong nuclear force is responsible for binding protons and neutrons together in the nucleus. It is much stronger than electromagnetic forces but acts only at very short distances within the nucleus.
6.63 x 10⁻¹⁰
6.63 x 10⁻¹⁶
6.63 x 10⁻²⁰
None of these
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Explanation
The energy (E) of a photon is given by:
E = hc/λ
where h is Planck's constant (6.63 x 10⁻³⁴ J s), c is the speed of light (3 x 10⁸ m/s), and λ is the wavelength.
E = (6.63 x 10⁻³⁴) * (3 x 10⁸) / (3 x 10⁻¹⁰) = 6.63 x 10⁻¹⁶ J
1000V
700V
800V
None of these
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Explanation
The secondary voltage (Vs) is given by:
Vs = (Ns/Np) * Vp
where Ns is the number of turns in the secondary coil, Np is the number of turns in the primary coil, and Vp is the primary voltage.
Vs = (500/150) * 100 = 1000/3 *3= 1000/3 * 3= 1000
600V
800V
700V
None of these
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Explanation
The induced EMF (ε) is given by:
ε = -N(dΦ/dt)
where N is the number of turns, Φ is the magnetic flux, and d/dt is the rate of change of flux.
ε = -600(8-5)/3 = 600V
