PPSC PAST PAPERS MCQS 2004 TO 2020 OF EVERYDAY SCIENCE
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
میڈولا اوبلونگاٹا انسانی جسم کا کو سا حصہ ہے؟
- Brain
- Digestive system
- Respiratory system
- Reproductive system
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Medulla oblongata is a part of your brainstem,
that connects your brain to your spinal cord.
It also manages many of the most important functions of your body.
It is a cone-shaped neuronal mass responsible for autonomic functions ranging from vomiting to sneezing
موٹر گاڑی چلاتے وقت، ڈرائیور کو کن اصولوں پر عمل کرنا چاہیے
- right hand driving
- left hand driving
- inner hand driving
- middle hand driving
- none of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Right-hand driving ensures a systematic flow of traffic, with vehicles moving in the same direction on the right side of the road.
This standardization helps prevent confusion and reduces the likelihood of accidents.
Additional information:
When driving a motorized vehicle, the driver must obey the principle of driving on the right-hand side of the road.
This is known as right-hand driving, where vehicles keep to the right side of the road while driving.
راکٹ کا کام کس کےاصول پر مبنی ہے
- Electricity
- Kepler's law
- Newtons law
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Rocket works on the principle of conservation of linear momentum.
conservation of linear momentum and third law of motion
The hot gases acquire momentum in the backward direction
& the rocket acquires an equal amount of momentum in the forward direction.
کون سی فہرست صرف ویکٹر کی مقدار پر مشتمل ہے؟
- Mass, temperature, kinetic energy, acceleration
- Acceleration, electric field, Velocity
- Temperature, K.E, volume, velocity
- K.E, length, electric charge, volume
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
A vector quantity is a physical quantity that has both magnitude and direction.
Acceleration, electric field, and velocity are vector quantity because It has both magnitude and direction.
Additional information:
a scalar quantity only has magnitude.
Mass, temperature, and kinetic energy, volume, are scalar quantities because they all contain only magnitude
ماحول کی کون سی تہہ سورج سے الٹرا وائلٹ شعاعوں کو باہر نکالنے کے لیے ذمہ دار ہے؟
- Mesosphere
- Stratosphere
- Troposphere
- None
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Explanation
- The stratosphere prevents UV rays from surface of the Earth
- 90% of the ozone in the atmosphere is occupied by the Stratosphere.
- Ozone molecules are constantly formed and destroyed in the stratosphere
Additional Information
Ozone is a molecule that contains three oxygen atoms
The atmosphere can be divided into five layers:
- Troposphere (all weather occurs within this layer)
- Stratosphere (ozone layer absorbs UV rays)
- Mesosphere (coldest layer of the atmosphere)
- Thermosphere (radiowaves transmitted from the Earth and reflected by this layer)
- Exosphere (molecules and atoms escape)
- 6.0
- 6.5
- 7.0
- 7.5
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
The pH range of fresh milk is 6.4 to 6.8.
- ions
- molecules
- atoms
- none
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Explanation
All matter consists of atoms,
which, in turn, consist of protons, neutrons and electrons.

مندرجہ ذیل میں سے کون سی گیس اوزون کی تہہ کے لیے سب سے زیادہ نقصان دہ ہے؟
- CO2
- Chlorofluorocarbon
- Nitrogen oxide
- Sulphur dioxide
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Chlorofluorocarbon gas is the most harmful to the ozone layer.
The stratospheric ozone layer is Earth's “sunscreen” protecting living things from too much ultraviolet radiation from the sun.
Oxygen layer in the atmosphere
Ozone protects us from the harmful ultraviolet radiation of the sun.
Ozone formula: O3
The ozone layer lies approximately 15-40 kilometers (10-25 miles) above the Earth's surface, in the stratosphere.
The ozone layer is depleting: Air pollution
مندرجہ ذیل میں سے کون سا بایو گیس کا اہم جز ہے؟
- Propane
- Butane
- Hexane
- Methane
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- The largest component of natural gas is methane
- **
- Natural Gas is also known as Methane.
- The principal use of methane is as a fuel.
- Natural gas also contains smaller amounts of natural gas liquids (NGLs, which are also hydrocarbon gas liquids)
- ****
- Largest natural gas producer country in the world Russia
- Russia is home to the world's largest natural gas reserves, with a total proved resource of 38 TCM
*****
اوزون کی تہہ میں ____ پر سوراخ ہے
- South Pole
- North Pole
- Equator
- Both a and b
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
The ozone hole happens when the protective ozone layer in the stratosphere above the South Pole begins to thin every September.
All Important Questions Related to "OZONE"
The stratospheric ozone layer is Earth's “sunscreen” protecting living things from too much ultraviolet radiation from the sun.
Oxygen layer in the atmosphere
Ozone protects us from the harmful ultraviolet radiation of the sun.
Ozone formula: O3
The ozone layer lies approximately 15-40 kilometers (10-25 miles) above the Earth's surface, in the stratosphere.
The ozone layer is depleting: Air pollution
ND17-7-2023