166: A married couple adopted a male child. A few years later twin boys were born to them. The blood group of the couple is 'AB' positive and 'O' negative. The blood group of the three sons is A positive, B positive, and 'O' positive. The blood group of the adopted son is
(a) A positive
(b) B positive
(c) O positive
(d) Cannot be determined
167: The 'Swadeshi' and 'Boycott' were adopted as methods of struggle for the first time during the
(a) agitation against the Partition of Bengal
(b) Home Rule Movement
(c) Non-Cooperation Movement
(d) visit of the Simon Commission to India
168: Consider the following factors:
1. Rotation of the Earth
2. Air pressure and wind
3. Density of ocean water
4. Revolution of the Earth
Which of the above factors influence the ocean currents?
(a) 1 and 2 only
(b) 1, 2 and 3
(c) 1 and 4
(d) 2, 3 and 4
169: In a family there are husband wife, two sons and two daughters. All the ladies were invited to a dinner. Both sons went out to play. Husband did not return from office. Who was at home ?
(a) Only wife was at home
(b) All ladies were at home
(c) Only sons were at home
(d) No body was at home
170: When water is heated from zero Degree Celsius to Ten Degree Celsius, its volume
(a) increases
(b) decreases
(c) does not change
(d) first decreases and then increases