EVERYDAY SCIENCE
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پی ڈی ایف میں ڈنلوڈ کرنے کے لیےاس لنک پر کلک کریں۔
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
درمیانی علاقے میں دو مخالف چارج پلیٹوں کے درمیان بجلی کی شدت _____ ہے؟
Uniform
Non-uniform
Cannot be predicted
Variable
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Explanation
The electric intensity between two oppositely charged plates in the middle region is uniform .
This is because the electric field strength remains constant between the plates.
It assuming they are large and parallel , and the charges are evenly distributed .
2400V
1200V
300V
150V
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Explanation
The formula to calculate potential difference (V) is:
V = W / Q
Where:
W = work done (in Joules)
Q = charge (in Coulombs)
Given:
W = 600 J (work done)
Q = 2 C (charge)
V = 600 J / 2 C = 300 V
So, the potential difference is 300 V.
مندرجہ ذیل میں سے کون سا برقی قوتوں کی خصوصیت نہیں ہے؟
They act on charges
They act on masses
They can be attractive
They can be repulsive
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Explanation
They act on masses is NOT a feature of electric forces.
Electric forces specifically act on charged particles .
It can be attractive or repulsive , but do not act on masses unless they are charged.
3 mA
3 A
0.3 mA
0.3 A
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Explanation
Current (I) is defined as the rate of flow of charge (Q) with respect to time (t). The formula to calculate current is:
I = Q / t
Given:
Q = 90 C (charge)
t = 30 s (time)
I = 90 C / 30 s = 3 A
So, the current in the wire is 3 A.
دھاتوں میں کرنٹ کی شدت اس کے پار ممکنہ فرق کے متناسب ہے جب تک کنڈکٹر کا درجہ حرارت مستقل رکھا جاتا ہے اسے کیا کہا جاتا ہے؟
Ohm's Law
Ampere's Law
Joule's Law
Gauss Law
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Explanation
The magnitude of the current in metals being proportional to the potential difference across it, as long as the temperature of the conductor is kept constant, is known as Ohm's Law .
This law is expressed mathematically as V= I⋅R , where V is voltage , I is current , and R is resistance .
جب تانبے کے تار کی لمبائی دوگنی ہو جاتی ہے تو مزاحمت ______ ہو جاتی ہے؟
Remains same
Four times
Double
Half
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Explanation
When the length of a copper wire is doubled, the resistivity remains the same .
Resistivity is an intrinsic property of the material and does not change with the dimensions of the wire.
However, the resistance will double , as resistance is directly proportional to the length of the wire.
درجہ حرارت میں اضافے کے ساتھ سیمی کنڈکٹر کی مزاحمت ______؟
Increases
Remain same
Infinite
Decreases
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Explanation
The resistance of a semiconductor with a rise in temperature decreases .
This occurs because increasing temperature provides more energy to charge carriers.
It allowing them to move more freely and conduct electricity better.
Volt
Current
Resistance
Power
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Explanation
Volt x Ampere is the measure of power .
Specifically, it represents electrical power in watts (W) , where power (P) is calculated using the formula
P=V×I , with V being voltage and I being current .
Electric flux density
Gravitational flux
Electric flux
Magnetic flux
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Explanation
The formula Φ = 𝐵⋅ 𝐴 represents magnetic flux .
Here, 𝐵 is the magnetic flux density , and 𝐴 is the area through which the magnetic field lines pass.
It indicating the total magnetic field passing through that area.
مندرجہ ذیل میں سے کون سا بیان کسی بھی مقناطیسی فیلڈ لائنوں کے لیے غلط ہے؟
The lines are curved
Magnetic field is strongest when the lines are farthest
Lines start at north pole and ends at south pole
Lines never touch or cross each other
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Explanation
The incorrect statement is " Magnetic field is strongest when the lines are farthest ."
In fact, the magnetic field is strongest where the lines are closest together.
It indicating a higher density of magnetic field lines.