Which of the following is an exhaustible source of energy ?

1. Fossil fuels
2. Nuclear energy
3. Solar energy
4. Wind energy

What are the age restrictions for marriage by law for boys and girls in India?

1. 18 years, 21 years
2. 21 years, 19 years
3. 21 years, 18 years
4. 18 years, 17 years

Name two surgical techniques (one for the human male and another for the human female) that can be used to prevent pregnancy.

Mention whether the following statements are true (T) or false (F).

(a) Vasectomy is the surgical method of sterilisation in human males.

(b) Tubectomy is the placing of a diaphragm on the cervix.

(c) Cow was the first domesticated animal.

(d) Rapidly growing industries favoured population rise.

(e) Present human population growth is following arithmetic progression.

(f) Birth rate (natality) is the number of live births per hundred people of population per decade.

(g) Tubectomy is a popular surgical method of contraception in human males.