Kit Library / Competitive Exams / SSC
⚡ Topic Learning KitShared by a Veda learner · Generated with Veda AI
Veda Bites are swipeable micro-lessons — each one teaches exactly one idea. The bites below come from this kit — swipe through them in the app.
💡 Key Idea
The clerk keeps the office running.
An LDC (Lower Division Clerk) is the entry-level clerical backbone of a government office — handling files, data, typing and routine correspondence so that senior officers can focus on decision-making.
↳ LDC = the administrative support role that keeps daily government office work moving.
📖 Definition
Clerk today, head clerk tomorrow.
↳ LDC is the starting rung; UDC is the next step up the clerical ladder.
💡 Key Idea
Speed, accuracy, and discipline win.
↳ Typing speed + computer basics + accuracy are the three skills that decide LDC success.
⭐ Important Fact
Many boards, one common goal.
LDC recruitment is conducted by multiple authorities — Staff Selection Commission (SSC), State Public Service Commissions, and individual departments — each with its own notification, syllabus and exam pattern.
↳ Always check the specific recruiting body's notification before preparing.
⚙️ Process
Four stages stand between you and the post.
↳ Written exam + typing test are the two elimination stages that matter most.
⚖️ Comparison
Two very different challenges.
↳ You must prepare for both — knowledge alone won't clear the typing test.
💡 Key Idea
Four subjects, one score sheet.
↳ Balance all four subjects — most LDC cutoffs are decided by overall score.
🎯 Exam Tip
Don't leave typing for the last week.
↳ Typing speed is a skill, not knowledge — it needs daily repetition, not last-minute cramming.
⚠️ Common Mistake
The notification is your real syllabus.
↳ The notification defines the exam — everything else is secondary.
🌍 Real World
Files, data, and deadlines — every day.
↳ LDC work is routine but essential — reliability is the real job description.
🛠️ Application
Almost every government office needs one.
↳ LDC vacancies exist across central, state and PSU offices — check each separately.
🧠 Memory Trick
GK, Maths, English, Reasoning — GMER.
Use the mnemonic GMER to recall the four core LDC exam areas: General Knowledge, Maths, English, Reasoning.
↳ GMER keeps the four core subjects in your head at a glance.
LDC is a start, not a stop.
↳ LDC offers job security plus a clear promotion ladder for those who keep preparing.
Small daily habits beat weekend marathons.
↳ Consistent daily effort across subjects and typing beats last-minute cramming.
🚫 Warning
English alone won't save you.
↳ Language papers are often the easiest scoring section — don't leave them to chance.
LDC (Lower Division Clerk) is a clerical government post focused on office administration, record-keeping, data entry and routine correspondence. This kit covers the role, core skills, typical exam structure and preparat…
Full explanation, worked examples & memory tricks in the app
All 18 questions, laddered from warm-up to topper-level, each with its answer and the reasoning behind it.
Q1. What does the JVM opcode `ldc` stand for?
BeginnerC · Load Constant
`ldc` expands to **Load Constant**. It is the JVM instruction that fetches a constant from the class's constant pool and pushes it onto the operand stack.
Q2. Where does `ldc` read its value from?
BeginnerD · The class's constant pool
`ldc` reads from the **constant pool** of the current class. Local variables are read by the `*load` family (`iload`, `aload`, `fload`), and static fields by `getstatic`.
Q3. How many bytes wide is the constant pool index carried by plain `ldc`?
BeginnerA · 1 byte
`ldc` carries a **1-byte unsigned index** (0–255), which keeps the bytecode compact. The 2-byte form is `ldc_w`.
Q4. Which opcode must be used to push a `double` constant?
BeginnerB · `ldc2_w`
`long` and `double` occupy **two operand-stack slots**, so they require `ldc2_w`. Plain `ldc` handles only single-slot values.
Q5. A compiler emits `ldc #7 // String hello`. What does the `#7` refer to?
BeginnerD · Entry 7 in the class's constant pool
The number after `ldc` is the **constant pool index**. Entry 7 in this class's pool holds the string `hello`, which `javap` helpfully prints as a comment.
Q6. **ldc** is a JVM bytecode instruction that loads a constant from the class's constant pool onto the operand stack, using a 1-byte index.
BeginnerA · True
**ldc** is a JVM bytecode instruction that loads a constant from the class's constant pool onto the operand stack, using a 1-byte index.
Q7. A class's constant pool has grown to 400 entries. Which opcode will the compiler use for a `String` literal?
IntermediateC · `ldc_w`
A 1-byte index can only address 0–255, so a 400-entry pool needs the **2-byte index** of `ldc_w`. `ldc2_w` is reserved for `long` and `double`.
Q8. Why does the JVM keep literals in a constant pool instead of inlining them in bytecode?
IntermediateC · It deduplicates literals and allows lazy resolution
The pool **deduplicates** repeated literals — one entry, many `ldc` references — and enables **lazy resolution**, so a class reference is not loaded until an `ldc` actually touches it.
Q9. Which statement correctly contrasts `iload_1` with `ldc 5`?
IntermediateC · `iload_1` reads a local variable; `ldc 5` pushes a pool constant
The `*load` family reads **local variable slots** in the stack frame, while `ldc` reads the **constant pool**. They share the word "load" but are unrelated mechanisms.
Q10. Which of these constants can plain `ldc` push directly?
IntermediateB · A `Class` literal such as `String.class`
`ldc` handles single-slot constants including `int`, `float`, `String`, `Class`, `MethodType`, `MethodHandle` and `Dynamic`. `long` and `double` need `ldc2_w`, and local variables need `*load`.
Q11. A student writes `int i = 5;` and `long x = 5L;`. Why do the two statements compile to different constant-loading opcodes?
IntermediateB · `long` takes two stack slots, so it needs `ldc2_w`
The deciding factor is **operand-stack slot count**: `long` and `double` occupy two slots, so the JVM provides `ldc2_w` for them. Both values still live in the constant pool.
Q12. Which instruction pushes the value of a **static field**, rather than a literal?
IntermediateD · `getstatic`
`getstatic` reads a **static field's value**. `ldc` and its variants push constants from the pool, and `bipush` pushes a small integer literal inline.
Q13. Why does `System.out.println("Hi");` contain an `ldc` in its bytecode?
IntermediateC · The string literal `"Hi"` must be pushed from the constant pool
`System.out` is fetched with `getstatic`, but the argument `"Hi"` is a **string literal**, so the compiler emits `ldc` to push it onto the operand stack before `invokevirtual`.
Q14. A developer wants to see exactly which constant pool entry each `ldc` uses in a compiled class. Which command is appropriate?
AdvancedB · `javap -c` on the class file
`javap -c` disassembles the class and prints each `ldc` with its **pool index and a comment** showing the value, e.g. `ldc #7 // String hello`. That is the fastest way to read stack-based execution.
Q15. Consider these statements about the constant pool: I. It is shared globally across all loaded classes. II. Entries are resolved lazily, only when touched. III. Repeated string literals share a single entry. Which are correct?
AdvancedD · II and III only
The constant pool is **per-class**, not global, so statement I is wrong. Statements II (lazy resolution) and III (deduplication) are both correct.
Q16. A method contains `String.class` and `Class.forName("com.example.Foo")`. What do these two constructs have in common at the bytecode level?
AdvancedD · Both rely on `ldc` to push a pool entry before resolution
A `Class` literal and the class-name string passed to `Class.forName` are both **constant pool entries**, so `ldc` pushes them before the JVM resolves the class. Neither takes two slots, so `ldc2_w` is not involved.
Q17. A developer is optimizing a Java application with a large constant pool containing over 300 entries. They want to ensure efficient bytecode generation for string literals. Which instruction should they expect to see in the compiled bytecode for a string literal?
AdvancedC · ldc_w
The correct option is `ldc_w` because it is used for constant pools with more than 255 entries, ensuring that the string literal can be correctly referenced without exceeding the index limit.
Q18. Consider a Java method that includes the following lines of code: `String str = "Hello"; double value = 3.14;`. When compiled, which of the following bytecode instructions will be generated for these lines, and why?
AdvancedB · The string uses `ldc`, while the double uses `ldc2_w`
The correct option is that the string uses `ldc` because it fits within a single slot, while the double requires `ldc2_w` because it occupies two slots on the operand stack.
20 flashcards in this kit — the app reviews them with spaced repetition so the right card returns on the right day.
Every game is built from this kit's own content — scores feed your mastery, so playing counts as studying.
Word Match
Built from this kit's own content
True False
Built from this kit's own content
Memory Match
Built from this kit's own content
Flashcard Battle
Built from this kit's own content
Speed Quiz
Built from this kit's own content
Guess Term
Built from this kit's own content
Sequence Builder
Built from this kit's own content
Categorization
Built from this kit's own content
Revision Battle
Built from this kit's own content
Playable in the app
The full Veda Bites deck, complete notes, spaced-repetition flashcards, leveled MCQs, tests and games for this kit — plus Daily Facts and the Arena, every day.