This page covers RRB ALP Physics โ Everyday Concepts with complete concept notes, 41 graded practice MCQs, key points and exam-specific tips. Free to study.
Pressure = Force รท Area. When you press a drawing pin into a board, the sharp point creates high pressure because the same force is concentrated on a tiny area. This is why pins pierce easily but your finger pressing with the same force cannot
๐กKey Properties
Pressure is directly proportional to force and inversely proportional to area. Double the force, double the pressure. Double the area, halve the pressure. Pressure acts in all directions in fluids (Pascal's Law).
At any point in a stationary fluid, pressure is the same in all directions.
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Formula Block
Memorise โ at least one formula appears in every paper
Pressure (P) = Force (F) รท Area (A)
Fluid Pressure = Density ร g ร Height
Atmospheric Pressure = 1.013 ร 10^5 Pa = 760 mm Hg
Units: Pascal (Pa), N/mยฒ, Bar, Atmosphere, mm Hg
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Exam Patterns
What examiners ask โ read before attempting PYQs
SSC asks about atmospheric pressure values, pressure applications (hydraulic systems, barometers), and calculation problems. Questions often involve pressure differences at heights, pressure in liquids, and practical applications like syringes, pumps.
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Shortcuts
Use these to save 30โ60 seconds per question
Remember 'FAPA' - Force and Area are in Pressure Always. Increase Force = Increase Pressure. Increase Area = Decrease Pressure.
For fluid pressure, remember 'DGH' - Density ร Gravity ร Height.
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Worked Example
Solve this step-by-step before moving on
1
Step 1
Identify given values - Force = 200 N, Area = 4 mยฒ
2
Step 2
Apply formula - Pressure = Force รท Area
3
Step 3
Substitute values - Pressure = 200 รท 4
4
Step 4
Calculate - Pressure = 50 N/mยฒ or 50 Pa
Another Example: If the same 200 N force acts on 2 mยฒ area instead:
Pressure = 200 รท 2 = 100 Pa
Notice: Half the area means double the pressure.
Shortcut for Unit Conversion: 1 Bar = 10^5 Pa. For quick conversion, Bar to Pa - add 5 zeros. Pa to Bar - remove 5 zeros.
Common Mistakes: Students often confuse force with pressure. Remember - force is push or pull, pressure is force per unit area. Another mistake is forgetting that liquid pressure depends on depth (height of liquid column), not the total volume. A thin tube and wide tank at same depth have equal pressure at bottom.
Practical Applications tested: Hydraulic brakes work on Pascal's law. Barometers measure atmospheric pressure. Syringes work due to pressure difference. Mountain climbers face low pressure at heights. Deep sea divers face high pressure underwater.
Test Physics โ Everyday Concepts under exam conditions
What is the speed of light in vacuum according to modern physics?
Practice 2easy
Which physicist formulated the law of universal gravitation?
Practice 3easy
Which scientist formulated the law of universal gravitation?
Practice 4easy
Which scientist is credited with the invention of the electric light bulb?
Practice 5easy
Which physical quantity is measured in Hertz (Hz)?
Practice 6easy
What is the SI unit of temperature?
Practice 7easy
What is the SI unit of energy?
Practice 8easy
Which of the following statements about friction is correct?
Practice 9easy
What is the SI unit of force?
Practice 10easy
Which of the following is the SI unit of electric current?
Practice 11easy
What is the SI unit of force?
Practice 12easy
Which of the following is an example of a renewable source of energy?
Practice 13medium
Which of the following statements about pressure is correct?
Practice 14medium
Which of the following is the SI unit of electric current?
Practice 15medium
A person uses a concave mirror to shave or apply makeup because concave mirrors produce:
Practice 16medium
When light passes from a denser medium (like glass with refractive index 1.5) to a less dense medium (like air with refractive index 1.0), the light ray bends:
Practice 17medium
A sound wave travels through air at approximately 340 m/s at room temperature (20ยฐC). If a person hears an echo 2 seconds after shouting, what is the approximate distance to the reflecting surface (wall/cliff)?
Practice 18medium
Which of the following phenomena best explains why a person feels lighter when standing in an elevator moving downward with acceleration?
Practice 19medium
Which of the following best describes the phenomenon of refraction of light?
Practice 20medium
What is the relationship between frequency and wavelength of a wave in the same medium?
21 more practice questions in the Study Panel
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