✓ 1 MARKS
MCQ
🔥 APPEARED IN 3 BOARD SETS
The radius of a nucleus of mass number 125 is
A
$6\cdot 0\text{ fm}$
B
$30\text{ fm}$
C
$72\text{ fm}$
D
$150\text{ fm}$
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2026 | Series 55-5 | Set 1 | Question 9 |
| CBSE 2026 | Series 55-5 | Set 2 | Question 3 |
| CBSE 2026 | Series 55-5 | Set 3 | Question 12 |
02 // OFFICIAL CBSE MARKING SCHEME BREAKDOWN
- Step 1: Stating the fundamental formula / law statement (+1 Mark)
- Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
- Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)