GENERAL SCIENCE CLASS 10 MCQS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
مقناطیسی میدان کی موجودگی کا پتہ _______ سے لگایا جا سکتا ہے؟
Small mass
Stationary positive charge
Stationary negative charge
Magnetic compass
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Explanation
A magnetic compass is a device that responds to the presence of a magnetic field by aligning its needle with the direction of the field.
It is a common tool used to detect and measure magnetic fields.
بار مقناطیس کے اندر مقناطیسی فیلڈ لائنوں کی سمت کیا ہے؟
From north pole to south pole
South pole to north pole
From side to side
There are no magnetic field lines
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Explanation
The direction of the magnetic field lines inside a bar magnet is from south pole to north pole.
This is the opposite direction of the field lines outside the magnet , which go from the north pole to the south pole.
مقناطیسی قطبوں کے بارے میں کون سا بیان درست ہے؟
Unlike poles repel
Like poles attract
Magnetic poles do not effect each other
A single magnetic pole does not exist
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Explanation
Magnetic poles always exist in pairs , with every magnet having a north pole and a south pole.
Like poles (north-north or south-south) repel each other.
Unlike poles ( north-south or south-north ) attract each other.
الیکٹرک سرکٹ میں بیٹری کو جوڑنے کا مقصد مندرجہ ذیل میں سے کون سا ہے؟
To maintain resistance across the conductor
To vary resistance across the conductors
To maintain constant potential difference across the conductor
To maintain varying potential difference across the conductor
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Explanation
A battery is connected in an electric circuit to provide a constant potential difference (voltage) across the circuit, allowing electric current to flow through the conductors.
The battery maintains a constant voltage , ensuring a consistent flow of current through the circuit.
کسی جسم کے ذریعے برقی چارج کے بہاؤ کی مخالفت کرنے کی خاصیت کو الیکٹرک _______ کہتے ہیں؟
Capacitance
Resistance
Potential
Conductance
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Explanation
Resistance is the property of a material or object that opposes the flow of electric charge (current) through it.
It is measured in ohms (Ω) and depends on the material, length, and cross-sectional area of the object.
7 Ω
6 Ω
4 Ω
5 Ω
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Explanation
When two resistances are connected in parallel , the net resistance (Rnet) is calculated using the formula:
1/Rnet = 1/R1 + 1/R2
where R1 and R2 are the individual resistances.
In this case, R1 = 6 Ω and R2 = 12 Ω, so:
1/Rnet = 1/6 + 1/12 = 1/4
Rnet = 4 Ω
Therefore, the net resistance of the two resistances connected in parallel is 4 Ω.
اوہم کا قانون ______ پر لاگو نہیں ہوتا؟
D.C. circuits
Small resistors
High currents
Semiconductors
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Explanation
Ohm's law is not applicable to Semiconductors , as the relationship between voltage and current does not remain constant in these devices.
Semiconductors have a non-linear current-voltage characteristic, making Ohm's law inapplicable.
اوہم کے قانون کے درست ہونے کی شرط یہ ہے کہ ______؟
Temperature should remain constant
Current should be proportional to voltage
Resistance must be wire wound type
All of the above
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Explanation
Ohm's Law is valid only if the temperature of the conductor remains constant.
If the temperature changes , the resistance of the conductor may change , and Ohm's Law may not hold.
وہ حالت جب کسی سرکٹ کی مزاحمت صفر ہو تو کیا کہا جاتا ہے؟
Closed-circuit
Short circuit
Open circuit
Zero circuit
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Explanation
A short circuit is a condition where the resistance of a circuit is zero, or very close to zero.
This occurs when there is a direct connection between two points in a circuit, bypassing any resistance or load.
As a result, the current flows freely, and the voltage across the circuit is zero.
اوہم کا قانون کہتا ہے کہ _______؟
Resistance increases as current increases
Resistance decreases as current increases
Resistance increases as voltage increases
Current increases as voltage increases
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Explanation
Ohm's Law states that the current (I) flowing through a conductor is directly proportional to the voltage (V) applied across it, and inversely proportional to the resistance (R) of the conductor.
Mathematically, this is expressed as: I = V/R Or, V = I × R
This means that as the voltage increases, the current increases, provided the resistance remains constant.
