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:
| 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 |
A sphere of radius R is cut from a larger solid sphere of radius 2R as shown in the figure. The ratio of the moment of inertia of the smaller sphere to that of the rest part of the sphere about the Y-axis is : 
AB is a part of an electrical circuit (see figure). The potential difference \(V_A - V_B\), at the instant when current \(i = 2\) A and is increasing at a rate of 1 amp/second is:
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 
It refers to the rapid increase in the population of an area among human beings. Furthermore, it is a situation where the economy is not capable of coping with the increasing demand of its population. Population explosion refers to the number of people that live in an area. It is a major issue for developing countries. Also, the government is not taking proper measures to control this problem
The cause of the population explosion includes many factors and reasons. These includes: