GENERAL SCIENCE CLASS 5 MCQS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
تمام برقی مقناطیسی لہریں ______ پر خلا کے ذریعے سفر کرتی ہیں؟
The different speed
The same speed
The increasing speed
The decreasing speed
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Explanation
All electromagnetic waves , including radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation , X-rays, and gamma rays, travel through a vacuum at the same speed. Which is approximately 299,792,458 meters per second (m/s) or 186,282 miles per second (mi/s). This is a fundamental constant of the universe and is denoted by the letter c.
At the center of the magnet
Equally all over the magnet
Nowhere, as iron filings are not attracted to magnets
At the poles
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Explanation
Iron filings are attracted to the magnetic field of a magnet. The magnetic field is strongest at the poles of the magnet. Therefore, the iron filings will be attracted more at the poles of the magnet, where the magnetic field is most intense. This is why you'll often see iron filings forming a pattern that traces out the magnetic field lines, with the filings clustering at the poles.
مندرجہ ذیل میں سے کون سی برقی مقناطیس کی اہم خصوصیت ہے جو انہیں کرینوں اور دروازے کی گھنٹیوں میں کارآمد بناتی ہے؟
They are very strong
They are permanent
They can be switched on and off
They are very heavy
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Explanation
Electromagnets can be easily turned on and off by controlling the electric current flowing through them. It making them useful in applications like cranes (where they can be used to lift and release heavy loads) and doorbells (where they can be used to strike a bell or activate a buzzer). This switchability is a key characteristic that makes electromagnets useful in many applications.
مندرجہ ذیل میں سے کون برقی توانائی کو حرکت میں بدل کر اپنا کام انجام دیتا ہے؟
An electric motor
An electric bulb
An electric iron
None
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Explanation
An electric motor converts electrical energy into mechanical energy, producing motion or rotation. It uses electromagnetic forces to generate torque , which drives a shaft or other mechanical components.
مندرجہ ذیل میں سے کون سا برقی مقناطیس اور بار میگنےٹ کے درمیان بنیادی فرق ہے؟
Electromagnets are stronger than bar magnets
Bar magnets are permanent, but electromagnets are temporary
Electromagnets are used in motors, but bar magnets are used in generators
Electromagnets need electricity but bar magnets do not need electricity
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Explanation
Electromagnets require an electric current to generate a magnetic field. Whereas bar magnets are permanent magnets that do not require electricity to exhibit magnetism. This is the main difference between the two types of magnets.
ایک بچے نے دو غباروں کو اون کے ٹکڑے سے رگڑا۔ مندرجہ ذیل میں سے کیا ہوتا ہے جب غبارے ایک دوسرے کے قریب لائے جاتے ہیں؟
The balloons will attract each other
The balloons will repel each other
The balloons will stick to the child's hair
The balloons will make a loud noise
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Explanation
When the child rubs the balloons with wool , the balloons become statically charged with the same type of charge (either positive or negative). When two objects with the same charge are brought near each other, they repel each other.
جب مقناطیس کے دو مخالف قطبوں کو ایک دوسرے کے قریب لایا جائے تو کیا ہوتا ہے؟
They repel
They attract
They make an electric current flow
None
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Explanation
When two opposite poles (north-south or south-north) of magnets are brought close to each other, they attract each other. This is because opposite poles have different polarities and therefore pull each other together.
جب مقناطیس کے دو ایک جیسے قطبین کو ایک دوسرے کے قریب لایا جائے تو کیا ہوتا ہے؟
They attract
They make an electric current flow
They repel
None
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Explanation
When two same poles (north-north or south-south) of magnets are brought close to each other, they repel each other. This is because like poles have the same polarity and therefore push each other away.
مندرجہ ذیل میں سے کون سا مقناطیسی مواد نہیں ہے؟
Steel
Aluminum
Cobalt
None
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Explanation
Aluminum is a non-ferrous metal. It is not capable of being magnetized or attracting magnets.
کیا ہوتا ہے جب آپ اپنے خشک اور غیر تیل والے بالوں میں پلاسٹک کی کنگھی چلاتے ہیں اور پھر کنگھی کو کاغذ کے ٹکڑوں کے اوپر پکڑتے ہیں؟
Bits of paper get instantly attracted to the comb
Bits of paper remain unaffected
Bits of paper start to repel the comb
Bits of paper start to stick to your hair
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Explanation
When you run a plastic comb through your dry and non-oily hair, the comb becomes statically charged. This static charge causes the comb to attract small, light objects like bits of paper. When you hold the comb above the paper, the paper is attracted to the comb due to the electrostatic force.
