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A. 273/373
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B. 373/273
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C. 100/0
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D. None of these
Explanation
- According to Charles' Law, at constant pressure, the volume of a gas is directly proportional to its temperature in Kelvin.
- The temperature must be converted to Kelvin, so the volume correction factor is , corresponding to the temperatures 100°C and 0°C.
دھاتوں کی غیر مساوی توسیع آپریشن کو ____ ممکن بناتی ہے؟
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A. Aneroid barometer
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B. Hygrometers
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C. Thermostats
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D. None of these
Explanation
- Thermostats work based on the unequal expansion of metals in a bimetallic strip.
- This property helps in regulating temperature by switching devices on or off.
مندرجہ ذیل میں سے کون سا گرمی کا ایک اچھا موصل لیکن بجلی کا برا کنڈکٹر ہے؟
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A. Rubber
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B. Celluloid
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C. None of these
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D. Mica
Explanation
Mica is a material that is a good conductor of heat but a poor conductor of electricity.
Due to its insulating properties, mica is commonly used in electrical and thermal applications.
Such as in insulating electrical equipment.
دوسری مائعات کے مقابلے میں پانی میں گرمی کی اعلی صلاحیت کی بنیادی وجہ کیا ہے؟
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A. It has a nonpolar molecular structure
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B. None of these
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C. Its molecular weight is high
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D. Hydrogen bonding between water molecules requires more energy to change temperature
Explanation
- Water molecules form hydrogen bonds, which require additional energy to break before temperature changes occur.
- This property allows water to absorb and store large amounts of heat.
- This making it essential for regulating Earth's climate and biological systems.
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A. Evaporation
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B. Filtration
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C. Dehydration
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D. None of these
Explanation
- Ignition of Fe(OH)₃ removes water (H₂O), converting it to Fe₂O₃.
- This process is called dehydration, as it involves the loss of water molecules.
مندرجہ ذیل میں سے کس کا سب سے زیادہ پگھلنے کا مقام ہے؟
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A. None of these
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B. Silicon
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C. Sulphur
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D. Phosphorus
Explanation
Silicon has the highest melting point among the given elements due to its giant covalent structure.
It requires more energy to break the strong covalent bonds.
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A. in
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B. on
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C. over
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D. by
Explanation
A computer works by electrical signals.
"By" is used to indicate the means or method by which the action is performed
ٹھوس کی لکیری تھرمل توسیع ____ پر منحصر ہے؟
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A. All of these
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B. Increasing in temperature
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C. Original length
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D. Properties of material
Explanation
Linear thermal expansion of a solid depends on:
- Increase in temperature
- Original length
- Properties of the material
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A. Latent heat of fusion
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B. Specific heat capacity
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C. Latent heat of Vaporization
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D. Thermal capacity
Explanation
Specific heat capacity is the thermal energy transfer required per unit mass to increase the temperature of a substance by 1°C (or 1 K).
It is a measure of how much heat energy a substance can absorb or release per unit mass per unit temperature change.
حرارت کی گنجائش ماس اور ______ کی پیداوار ہے؟
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A. Specific heat of material
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B. Freezing point
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C. Energy
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D. Boiling point
Explanation
Heat capacity is the amount of heat energy required to change the temperature of a substance by a given amount.
It is calculated as the product of the mass of the substance and its specific heat capacity:
Heat Capacity = mass x specific heat capacity
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