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Soumya Sir's Physics Class
MASTER GUIDE
Assertion-Reasoning & Case Studies
PART 1: Hacking "Assertion-Reasoning"
💡
Don't guess. Follow this exact 3-step algorithm to find the right option.
STEP 1: Check Truth Independently
Ignore the relationship. Just ask: Is Statement A true? Is Statement R true?
If any statement is False, you are lucky! Answer is C or D immediately.
Ignore the relationship. Just ask: Is Statement A true? Is Statement R true?
If any statement is False, you are lucky! Answer is C or D immediately.
⬇ If BOTH are True, proceed to Step 2 ⬇
STEP 2: The "BECAUSE" Bridge
Read the sentences like this:
"Statement A ... BECAUSE ... Statement R".
Read the sentences like this:
"Statement A ... BECAUSE ... Statement R".
⬇ Does it make sense? ⬇
OPTION (A)
Yes! The "Because" makes sense.
(Correct Explanation)
Yes! The "Because" makes sense.
(Correct Explanation)
OPTION (B)
No! Both are facts, but they aren't linked.
(Not Explanation)
No! Both are facts, but they aren't linked.
(Not Explanation)
Example to Try:
(A): Fuse is placed in series with the device.
(R): Fuse consists of a wire with low melting point.
Test: "Fuse is in series BECAUSE it has low melting point." -> Does NOT make sense.
(It is in series because it needs to stop current). So, Answer is (B).
(A): Fuse is placed in series with the device.
(R): Fuse consists of a wire with low melting point.
Test: "Fuse is in series BECAUSE it has low melting point." -> Does NOT make sense.
(It is in series because it needs to stop current). So, Answer is (B).
PART 2: Cracking "Case Studies"
🔍
RULE #1: Read Questions FIRST
Do not waste 5 minutes reading the long paragraph first. Read the 4 questions at the bottom. usually, 3 out of 4 questions can be answered without the paragraph just using your theory knowledge.
RULE #2: The "Graph" Trap
If the case study has a Graph or Table, the answer is usually hiding *inside* that data.
Example: "At what voltage does the device break?" -> Look at the peak of the graph.
Example: "At what voltage does the device break?" -> Look at the peak of the graph.
RULE #3: Stick to the Syllabus
Sometimes the paragraph talks about advanced things (like "Optical Fibers"). Don't panic. The questions will still be about basic "Total Internal Reflection" which you know.
PART 3: Exam Vocabulary
⚠️
"Justify your answer"
Means: Write the Formula or the Law name. (Don't write a story).
Means: Write the Formula or the Law name. (Don't write a story).
"Draw a labeled diagram"
Means: Arrows on rays and current are MANDATORY. No arrows = Zero marks.
Means: Arrows on rays and current are MANDATORY. No arrows = Zero marks.
"Variable Resistor" vs "Resistor"
Check if the symbol has an arrow across it.
Check if the symbol has an arrow across it.
"Screen"
If a question mentions a "Screen", the image MUST be Real. (Virtual images cannot be caught on a screen).
If a question mentions a "Screen", the image MUST be Real. (Virtual images cannot be caught on a screen).
