GENERAL SCIENCE CLASS 8 MCQS
General
Science MCQs Click Here
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
بارکوڈ ریڈر ایک ____ ڈیوائس ہے؟
- Input
- Output
- Display
- Storage
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Explanation
- A barcode reader, also called a price scanner or point-of-sale (POS) scanner.
- It is a hand-held or stationary input device.
- It used to capture and read information contained in a barcode.
- Newton
- Joule
- Watt
- Metre
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Explanation
The SI unit of force is the Newton, symbol N.
The base units relevant to force are:
- The metre, unit of length — symbol m
- The kilogram, unit of mass — symbol kg
- The second, unit of time — symbol s
پانی کی زیادہ سے زیادہ کثافت _____ ہے؟
- 2°C
- 3°C
- 4°C
- 5°C
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Explanation
Water has maximum density at 4-degree celsius
while
When Water is in its Solid form (Ice) below 0 C
مرکزی اعصابی نظام _____ پر مشتمل ہے؟
- Brain, Spinal Cord and Nerves
- Cerebrum, Thalamus and Hypothalamus
- Cerebrum, Pons and Medulla oblongata
- Cerebellum, Brain and Nerves
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Explanation
The Central Nervous System (CNS) comprises the:
- Brain, which processes information.
- The spinal cord, which relays messages between the brain and the body.
- The nerves, which transmit signals throughout the body.
کسی بھی جگہ پر ہوا کا دباؤ _____ سے ماپا جاتا ہے؟
- Altimeter
- Pressure Meter
- Thermometer
- Barometer
- None of the above
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Explanation
The atmospheric pressure at any place is measured by a Barometer
***
The barometer was invented by Evangelista in 1644.
**
گرین ہاؤس اثر ایک ماحولیاتی مسئلہ ہے جو فضا میں ________ کی بڑھتی ہوئی مقدار کی وجہ سے پیدا ہوتا ہے۔
- Oxygen
- Argon
- Nitrogen
- Carbon Dioxide
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Explanation
- The greenhouse effect is an environmental problem caused by the increasing amount of carbon dioxide (CO2) in the atmosphere.
- Primarily due to human activities such as burning fossil fuels, deforestation, and land-use changes.
- This excess CO2 traps heat and leads to global warming and climate change.
جب سفید روشنی کسی پرزم سے گزرتی ہے تو یہ کتنے رنگوں میں تقسیم ہو جاتی ہے۔
- 7
- 8
- 2
- 4
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Explanation
When white light passes through a prism, it splits into 7 colors, forming a spectrum known as a rainbow:
- Red
- Orange
- Yellow
- Green
- Blue
- Indigo
- Violet
The separation of visible light into its different colours is known as dispersion.
کم نظری کی خرابی کو کیا پہن کر درست کیا جا سکتا ہے؟
- Convex Lens
- Concave Lens
- Prism Lens
- Cylindrical Lens
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Explanation
- Short-sightedness (myopia) can be corrected by wearing a concave lens.
- It is thinner in the center than at the edges.
- This lens disperses light rays, allowing them to focus correctly on the retina.
سیل سے نکلنے والی بجلی کو _____ کہتے ہیں؟
- Direct Current (DC)
- Alternating Current (AC)
- Electric Potential (EP)
- Electric Resistance (ER)
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Explanation
- The electricity from a cell (such as a battery) is Direct Current (DC).
- It is the flow of electric charge in one direction only, without changing direction.
- This is the type of current used in electronic devices such as smartphones, laptops, and televisions.
اوزون گیس کا کیمیائی فارمولا ______ ہے؟
- O2
- NO2
- O3
- CO2
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Explanation
- Ozone gas is a molecule made up of three oxygen atoms, with the chemical formula O3.
- This is different from ordinary oxygen, which has the chemical formula O2.