GENERAL SCIENCE CLASS 7 MCQS
General
Science MCQs Click Here
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
ایک نوری سال کا تعلق ____ سے ہے؟
- Time
- Distance
- Frequency
- None of these
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Explanation
Light year refers to speed of light expressed in miles per year
(it is about ten trillion kilometers or six trillion miles).
Light year is a unit of distance.
Light Year: the distance that light can travel in one year.
The distance light travels in one year is known as the light year.
1 light year is equal to 9.5 x 10^12 km
بجلی کے خلاف مزاحمت کا ایس آئی یونٹ _____ ہے؟
- Volt
- Ohm
- Ampere
- Farad
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Explanation
The SI unit of electric resistance is the ohm (Ω).
1 Ω = 1 V/A.
while
The SI unit of resistivity is an ohm-meter.
- Hertz
- Metre
- Meter Per Second
- None of these
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Explanation
The hertz is the unit of frequency of one cycle per second.
symbol: hertz (Hz)
Hertz in honor of the German physicist Heinrich Hertz
hertz in the International System of Units (SI)
frequency is defined as one cycle per second
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- Planet
- Element
- Asteroid
- Star
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Explanation
The Sun is a star.
There are lots of stars, but the Sun is the closest one to Earth.
It is the center of our solar system.
The Sun is a hot ball of glowing gases.
The sun is composed of layers made up almost entirely of hydrogen and helium.
جب روشنی ایک شفاف میڈیم سے دوسرے میں داخل ہوتے وقت سمت میں بدل جاتی ہے تو کیا کہا جاتا ہے؟
- Reflection
- Diffraction
- Refraction
- Absorption
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Explanation
Refraction is the change in the direction of light when it passes from one medium to another.
It is one of the most commonly observed natural phenomena of light.
Optical prisms and lenses involve refraction to redirect light, and so does the eyes of living beings.
تھرموس فلاسک ____ کو کم کرکے چیزوں کو ان کے اصل درجہ حرارت کے قریب رکھتا ہے؟
- Conduction
- Convection
- Radiation
- All of these
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Explanation
A thermos flask is designed to reduce heat transfer through all three methods:
- Conduction: The flask has a vacuum insulation, which eliminates conduction through the container.
- Convection: The flask's design and vacuum insulation prevent convective heat transfer.
- Radiation: The flask's reflective coating minimizes radiant heat transfer.
ریفریجریٹر کے پچھلے حصے میں کولنگ فین سیاہ اور کھردری سطح سے بنے ہیں کیونکہ ____؟
- They are good conductors of heat
- They are good radiators of heat
- They are good insulators of heat
- They are not important for heat transfer
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Explanation
The cooling fins at the back of a refrigerator are typically made of a black, rough surface to maximize heat radiation. This design:
- Increases the surface area for heat transfer
- Absorbs heat from the surrounding air
- Emits heat more efficiently due to the rough surface
دن کے وقت، زمین کے اوپر کی ہوا اپنی کثافت کو گرم کرتی ہے ____؟
- Increase
- Decrease
- Remain same
- Fluctuate
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Explanation
- When the air above the land is heated during the daytime, its density decreases.
- This is because warm air expands and becomes less dense than cold air.
حرارت ____ سے وابستہ توانائی کی ایک شکل ہے؟
- Atomic Stability
- Molecular Motion
- Nuclear Reaction
- Electromagnetic Radiation
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Explanation
- Heat is a form of energy associated with the motion of molecules in a substance.
- As molecules vibrate, rotate, and collide, they transfer energy from one another, resulting in the sensation of heat.
عام انسانی کان کی قابل سماعت حد ____ ہے؟
- 16 Hz to 20kHz
- 10 Hz to 31kHz
- 67 Hz to 45kHz
- 20 Hz to 20kHz
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Explanation
- The audible range of a normal human ear is typically considered to be between 20 Hz (very low frequency) and 20,000 Hz (very high frequency).
- This range encompasses the vast majority of sounds that humans can perceive, from the lowest rumble to the highest pitch.