In column - I names of measuring instruments are mentioned and column - II possible type of errors are specified - Match the columns appropriately.
`{:(,"Column - I",,"Column - II"),((A),"Vernier callipers",(P),"Back lash error"),((B),"Screw gauge",(Q),"Positive zer error"),((C ),"Travelling microscope",(R ),"Negative zero error"),((D),"Meter scale",(S),"No error"):}`

Answer

To solve the problem of matching the measuring instruments in Column I with their corresponding types of errors in Column II, we will analyze each instrument and identify the possible errors associated with them.

### Step-by-Step Solution:

1. **Identify the Instruments and Errors**:
- Column I contains:
- A) Vernier callipers
- B) Screw gauge
- C) Travelling microscope
- D) Meter scale
- Column II contains possible types of errors:
- P) Backlash error
- Q) Positive zero error
- R) Negative zero error
- S) No error

2. **Analyze Vernier Callipers (A)**:
- Vernier callipers can have:
- Positive zero error (Q)
- Negative zero error (R)
- No error (S)
- **Match**: A → Q, R, S

3. **Analyze Screw Gauge (B)**:
- Screw gauge can have:
- Positive zero error (Q)
- Negative zero error (R)
- No error (S)
- **Match**: B → Q, R, S
- Note: Screw gauge does not have backlash error (P).

4. **Analyze Travelling Microscope (C)**:
- Travelling microscope can have:
- Backlash error (P)
- Positive zero error (Q)
- Negative zero error (R)
- No error (S)
- **Match**: C → P, Q, R, S

5. **Analyze Meter Scale (D)**:
- Meter scale is generally considered to have:
- No error (S)
- It does not typically have backlash error (P), positive zero error (Q), or negative zero error (R).
- **Match**: D → S

6. **Final Matching**:
- A → Q, R, S (matches with positive zero error, negative zero error, and no error)
- B → Q, R, S (matches with positive zero error, negative zero error, and no error)
- C → P, Q, R, S (matches with backlash error, positive zero error, negative zero error, and no error)
- D → S (matches with no error)

### Summary of Matches:
- A → Q, R, S
- B → Q, R, S
- C → P, Q, R, S
- D → S

### Final Answer:
- A → Q
- B → Q
- C → P
- D → S