LECTURER PHYSICS PAST PAPER 20-03-2021 BY SPSC
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
مندرجہ ذیل میں سے دنیا کا سب سے چھوٹا سمندر کون سا ہے؟
- Pacific
- Indian
- Atlantic
- Arctic
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Explanation
- The Arctic is the shortest ocean in the world.
Additional information:
- The Pacific is the largest ocean in the world.
- 71% of Earth's surface is covered by ocean.
- The warmest ocean in the world is the Indian ocean.
- The hottest ocean area is the Persian Gulf.
- Diamantina Trench is the deepest place in the Indian ocean.
- Country Jordon has no ocean.
The five major oceans listed by size from largest to smallest are the:
- The Pacific Ocean
- The Atlantic Ocean
- The Indian Ocean
- The Southern Ocean
- The Arctic Ocean
Last verified on 07-06-2026
سورج کی زیادہ تر توانائی کس عمل کی وجہ سے پیدا ہوتی ہے؟
- Chemical reaction
- Nuclear fission
- Nuclear Fusion (Fusion of Hydrogen)
- None of these
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Explanation
- Most of the energy produced by the Sun is due to Nuclear Fusion (Fusion of Hydrogen).
- In the Sun's core, hydrogen nuclei fuse to form helium, releasing a huge amount of energy.
- This energy is emitted as light and heat.
- Nuclear fusion has powered the Sun for about 4.6 billion years.
Last verified on 20-07-2026
رفتار کے وقت کے گراف کے تحت علاقہ ______ دیتا ہے؟
- Displacement
- Speed
- Acceleration
- None of these
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Explanation
- A velocity–time graph shows how velocity changes with time.
- The slope gives acceleration.
- The area under the graph represents motion covered.
- It connects velocity with displacement.
Last verified on 22-05-2026
لینز کا قانون _____ کی وضاحت کرسکتا ہے؟
- Only two of the three types of magnetism
- Ferromagnetism only
- Diamagnetism only
- None of these
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Explanation
Lenz’s Law states that the induced current opposes the change that produces it.
When a magnetic field is applied, induced currents in atoms oppose the applied field.
This opposing effect explains the behavior of diamagnetic materials.
Paramagnetism and ferromagnetism are explained mainly by electron spin and magnetic domains, not Lenz’s law.
Therefore, Lenz’s Law helps explain diamagnetism only.
Last updated 13-March-2026
- Putrid
- Grubby
- Clean
- None of these
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Explanation
- Filthy means غلیظ
- Clean means صاف
Last verified on 09-02-2026
پیرس آب و ہوا کے معاہدے سے مندرجہ ذیل میں سے کون سا پہلا ملک واپس لے گیا ہے؟
- India
- Australia
- USA
- Russia
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Explanation
The United States officially withdrew from the Paris Climate Accord On November 4, 2020, under President Donald Trump.The U.S. rejoined the agreement on February 19, 2021, under President Joe Biden.
لمبی عمارت کے اوپری حصے سے پھینک دیا جانے والا ایک پتھر اس راستے پر چلتا ہے جو ______ ہے؟
- Parabolic
- Circular
- Hyperbolic
- None of these
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Explanation
A projectile follows a parabolic path under the influence of gravity and initial velocity.The motion combines horizontal uniform velocity and vertical acceleration due to gravity.
اینٹروپی میں تبدیلی _____ کے لئے صفر ہے؟
- Reversible isobaric processes
- Reversible adiabatic processes
- Reversible isothermal processes
- None of these
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Explanation
In a reversible adiabatic process, no heat is exchanged with the surroundings (Q = 0), so the change in entropy (ΔS) is zero.Entropy change is linked to heat transfer, and since no heat enters or leaves, entropy remains constant.
- Superior
- Went on gambling
- Bought a horse
- None of these
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Explanation
"Rides the high horse" means acting superior, arrogant, or self-righteous.It originates from medieval times when higher-ranking people rode taller horses to show status.
انسانی جسم میں سب سے زیادہ وافر معدنیات کون سی ہے؟
- Potassium
- Calcium
- Sodium
- Magnesium
- None of the above
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Explanation
Calcium is the most abundant mineral in the human body,
calcium makes up 1.5 to 2% of the total body weight.
Approximately 1,200 g of calcium is present in the body of an adult human
more than 99% of that amount is found in bones.
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ND11-12-2022