GENERAL SCIENCE CLASS 9 MCQS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
مندرجہ ذیل میں سے کون سا دباؤ کی اکائی نہیں ہے؟
Pascal
Bar
Atmosphere
Newton
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Explanation
Newton is a unit of force , not pressure.
The units of pressure are:
Pascal (Pa) is the SI unit of pressure. Bar is a common unit of pressure, equal to 100,000 Pa.Atmosphere (atm) is a unit of pressure , equal to 101,325 Pa.
اگر بہار آسانی سے پھیلتی ہے تو اس کی بہار کا مستقل _____ ہوتا ہے؟
Large value
Small value
Constant Value
Both (a) and (b)
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Explanation
If a spring stretches easily , it means that it requires less force to stretch it a certain distance.
This is indicative of a spring with a small spring constant (k).
The spring constant is a measure of a spring's stiffness.
A smaller value means the spring is less stiff and more easily deformed.
مندرجہ ذیل میں سے کون سا مواد زیادہ لچکدار ہے؟
Rubber
Glass
Steel
Wood
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Explanation
Steel is more elastic than rubber, glass, and wood.
Elasticity refers to the material's ability to return to its original shape after being deformed.
Steel has a higher modulus of elasticity (Young's modulus), meaning it can withstand greater stress and still return to its original shape.
اگر مادّہ اصل جہتوں کو بحال کرتا ہے، جب کسی بیرونی قوت کو ہٹا دیا جاتا ہے، تو اس اخترتی کو ______ اخترتی کے نام سے جانا جاتا ہے۔
Inelastic
Permanent
Elastic
Irreversible
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Explanation
Elastic deformation occurs when a material temporarily changes shape in response to an external force, but returns to its original dimensions when the force is removed.
This type of deformation is reversible , meaning the material returns to its original state.
بریک اور کلچ میں چشمے استعمال ہوتے ہیں______؟
To restore original position
To measure forces
To absorb shocks
To absorb strain energy
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Explanation
The springs in brakes and clutches are used to restore the original position of the components after they have been engaged or disengaged.
For example, in a brake system , the springs return the brake pads to their original position after the brake pedal is released.
Similarly, in a clutch system, the springs return the clutch plate to its original position after the clutch pedal is released.
ایک ریسنگ کار کی استحکام میں _______ سے اضافہ ہوتا ہے؟
Increasing its height
Raising its centre of gravity
Decreasing its width
Lowering its centre of gravity
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Explanation
The stability of a racing car is increased by lowering its center of gravity , which reduces the risk of rollover or loss of control.
This can be achieved through design elements like a lower ride height, a wider stance, or a lower seating position for the driver.
دائیں رسی پر چلنے والا ______ تک ایک لمبا کھمبہ لے جاتا ہے؟
Increase his weight
Raise his centre of gravity
Lower his centre of gravity
Keep his centre of gravity in fixed position
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Explanation
A tightrope walker carries a long pole to lower their center of gravity, making it easier to balance and maintain equilibrium.
By spreading their weight over a larger area (including the pole), they reduce the risk of toppling over.
بنسن برنر کو ______ نے مستحکم بنایا ہے؟
Increasing its length
Increasing its mass
Decreasing its base area
Increasing its base area
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Explanation
A Bunsen burner is made more stable by increasing its base area , which lowers its center of gravity and makes it less likely to tip over.
This is a common design principle in engineering, where a wider base provides greater stability.
ایک جسم معمولی جھکاؤ کے بعد غیر مستحکم توازن میں ہے اگر اس کا مرکز ثقل ______ ہے؟
Remains on one side of the point of contact
Remains above the point of contact
Passes over the point of contact
Is positioned at its bottom
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Explanation
When a body is in unstable equilibrium , a slight tilt will cause its center of gravity (CG) to remain above the point of contact , making it prone to toppling over or falling.
This means that the CG is not directly over the point of support, but is still above it , creating a moment that tends to rotate the body further.
Key Points :
A body is in stable equilibrium after slight tilt if its center of gravity remains above the point of contact. A body is in neutral equilibrium when its center of gravity remains at same height.
ایک جسم معمولی جھکاؤ کے بعد مستحکم توازن میں ہے اگر اس کا مرکز ثقل _____؟
Remains above the point of contact
Remains on one side of point of contact
Passes over the point of contact
Is at lowest position
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Explanation
When a body is tilted slightly , if its center of gravity remains above the point of contact , it will tend to return to its original position , restoring equilibrium.
This is a characteristic of stable equilibrium.
Key Points :
A body is in unstable equilibrium after slight tilt if its center of gravity remains above the point of contact. A body is in neutral equilibrium when its center of gravity remains at same height.
