GENERAL SCIENCE CLASS 7 MCQS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
ہر ایٹم کے نیوکلئس میں موجود پروٹانس کی مخصوص تعداد اس کو ____ کہتے ہیں؟
- Atomic Number
- Mass Number
- Atomic Mass
- Valance Number
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Explanation
- Every element is identified by the number of protons in its nucleus.
- This number determines the identity of the element.
- It is written as Z in chemistry.
- It is always equal to the number of electrons in a neutral atom.
- This is called the atomic number.
Last verified on 12-04-2026
نوری سال _____ کی اکائی ہے؟
- Light
- Distance
- Time
- None of these
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Explanation
- Light Year is the distance that light can travel in one year.
- The distance light travels in one year is known as light year.
- 1 light year is equal to 9.5 x 10¹²km.
Last verified on 30-03-2026
اوسط بالغ کے خون کا حجم تقریباً کتنے لیٹر ہوتا ہے؟
- 6
- 4
- 8
- 5
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Explanation
- The average adult has a blood volume of about 5 liters (5-6 litres), though this can range from 4.5 to 5.5 liters.
- Male: About 5.5 liters.
- Female: About 4.5 liters.
- Proportion: Blood makes up roughly 7% of a person's total body weight.
Last verified on 30-03-2026
ٹھنڈے ستارے سرخ ستارے ہیں اور ان کا درجہ حرارت ____ کے آس پاس ہے؟
- 2000°C
- 3000°C
- 4000°C
- 5000°C
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Explanation
- Red stars (Red Dwarfs) are the coolest stars in the universe.
- Their surface temperature is around 3000°C (5400°F).
- Red dwarfs burn their fuel very slowly, lasting trillions of years.
Last verified on 19-03-2026
- Isaac Newton
- Albert Einstein
- Galileo Galilei
- Johannes Kepler
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Explanation
- Galileo Galilei is credited with creating his own improved version of the telescope in 1609.
- It based on the design of the "Dutch perspective glasses".
- He was the first to observe moons of Jupiter, Saturn’s rings, and lunar craters through a telescope.
Last verified on 19-03-2026
ایک خلائی علاقہ جہاں مادہ اپنے اوپر خود کو دبا لیتا ہے، اسے کیا کہا جاتا ہے؟
- White Dwarf
- Wormhole
- Black Hole
- Neutron Star
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Explanation
- A black hole is a region of space where matter has collapsed in on itself.
- It creating an incredibly dense and gravitational field so strong that not even light can escape.
- Black holes are detected via gravitational effects on nearby stars or X-ray emissions.
- Famous example: Sagittarius A* at the center of the Milky Way.
Last verified on 19-03-2026
وہ سب سے روشن ستارہ جو دوربین کے بغیر آسمان میں دیکھا جا سکتا ہے کون سا ہے؟
- Altair
- Aretonus
- Regulus
- Sirius
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Explanation
- Sirius means صبح کا ستارہ
- Sirius, also called the Dog Star.
- It is the brightest star in the night sky visible without a telescope.
- It is located in the constellation Canis Major.
- It is about 8.6 light-years from Earth.
Last verified on 19-03-2026
زمین ایک کہکشاں کا حصہ ہے جسے کیا کہا جاتا ہے؟
- Andromeda Galaxy
- Triangulum Galaxy
- Milky Way Galaxy
- Pinwheel Galaxy
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Explanation
- Earth is located in the Milky Way Galaxy.
- It a spiral galaxy containing hundreds of billions of stars.
- Our Solar System is one of the many systems within this galaxy.
Last verified on 19-03-2026
مندرجہ ذیل میں سے کون سا گرمی کا اچھا موصل ہے؟
- Wood
- Plastic
- Paper
- Copper
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Explanation
- Copper is an excellent conductor of heat.
- It having a high thermal conductivity (386 W/mK).
- This means it can efficiently transfer heat energy with minimal resistance.
- Metals (e.g., iron, copper, silver, mercury, aluminum) are good conductors of heat.
Last verified on 19-03-2026
مائعات اور گیسوں میں حرارت کی منتقلی کس طریقے سے ہوتی ہے؟
- Convection
- Radiation
- Conduction
- None of these
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Explanation
- In liquids and gases, heat is mainly transferred by convection.
- Convection involves the movement of particles carrying heat from one place to another.
- Essential for weather patterns, ocean currents, and heating systems.
Last verified on 19-03-2026
