Answer: C) Norway Explanation: The case where there is 6 months day, and 6 months night could only happen on poles because The Earth is tilted on its axis. The pole which is away (opposite direction of sun) from the Sun remains in complete darkness till it comes in front of the sun. So we conclude that, countries at the poles have 6 months day, and 6 months night. So countries close to these region have such cases like, Alaska, Antarctica, Norway etc. Norway, the northernmost inhabited region of Europe, there is no sunset from approximately 19 April to 23 August. The extreme sites are the poles, where the sun can be continuously visible for half the year. The North Pole has midnight sun for 6 months from late March to late September.

Answer: A) 189 Explanation: The given number series is 10, 21, 54, 109, 189 The series follows a pattern that 10 + 11 = 21 21 + 33 = 54 54 + 55 = 109 109 + 77 = 186   Hence the wrong number in the given number series is 189.

Answer: C) Convex Explanation: Convex mirror is used as rear view mirror in vehicles. Because the image is smaller, more image can fit onto the mirror, so a convex mirror provides for a larger field of view than a plane mirror. This is why they are useful.

Answer: B) Gupta period Explanation: