KVPY Government Jobs Exams

In the Arcitc region hemispherical houses called Igloos are made of ice. It is possible to maintain a temperature inside an Igloo as high as 20º C because
option
(A) Ice has high thermal conductivity
(B) Ice has low thermal conductivity
(C) Ice has high specific heat
(D) Ice has higher density than water

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KVPY Other Question
A boat crossing a river moves with a velocity v relative to still water. The river is flowing with a velocity v/2 with respect to the bank. The angle with respect to the flow direction with which the boat should move to minimize the drift is
option
(A) 30 degree
(B) 60 degree
(C) 150 degree
(D) 120 degree A convex lens of focal length 15 cm is placed in front of a plane mirror at a distance 25 cm from the mirror. Where
on the optical axis and from the centre of the lens should a small object be placed such that the final image
coincides with the object ?
(A) 15 cm and on the opposite side of the mirror
(B) 15 cm and between the mirror and the lens
(C) 7.5 cm and on the opposite side of the mirror
(D) 7.5 cm and between the mirror and the lens