Match List I with List II.
List I | List II | ||
| A | Vasectomy | I | Oral method |
| B | Coitus interruptus | II | Barrier method |
| C | Cervical cap | III | Surgical method |
| D | Saheli | IV | Natural method |
Choose the correct answer from the options given below:
To solve the problem of matching List I with List II, we need to recognize the relationship between different contraceptive methods and their categories:
| List I | Description |
| Vasectomy | A permanent surgical method of male sterilization where the vas deferens are cut to prevent sperm from entering the seminal stream. |
| Coitus interruptus | A natural method of contraception in which the male withdraws before ejaculation to prevent sperm from entering the female reproductive tract. |
| Cervical cap | A barrier method where a cap is placed over the cervix to block sperm from entering the uterus. |
| Saheli | An oral contraceptive method where pills are used for birth control by altering hormone levels to prevent ovulation. |
Based on the definitions, we can match List I with List II:
Thus, the correct answer is: A-III, B-IV, C-II, D-I.
| List - I (Period) | List - II (Population Growth Characteristics) | ||
| (A) | 1901 - 1921 | (I) | Period of Population Explosion |
| (B) | 1921 - 1951 | (II) | Gradually slowing down of growth rate |
| (C) | 1951 - 1981 | (III) | Period of steady Population Growth |
| (D) | 1981 - till present | (IV) | Stagnant or stationery phase of growth |
Three identical heat conducting rods are connected in series as shown in the figure. The rods on the sides have thermal conductivity 2K while that in the middle has thermal conductivity K. The left end of the combination is maintained at temperature 3T and the right end at T. The rods are thermally insulated from outside. In steady state, temperature at the left junction is \(T_1\) and that at the right junction is \(T_2\). The ratio \(T_1 / T_2\) is 
