1811: Stripes on the back of the animals are the indication of:
(a) Mating habit
(b) Food habit
(c) Cave dwelling
(d) Matching of skin colour with surroundings
1812: A car is running on a road at a uniform speed of 60 km/hr. The net resultant force on the car is:
(a) Driving force in the direction of car's motion
(b) Resistance force opposite to the direction of car's motion
(c) An inclined force
(d) Equal to zero
1813: 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
1814: The surface of the water in a lake is frozen and its temperature is -15°C. The maximum possible temperature of the water inside the lake in contact with the ice layer will be:
(a) 0°C
(b) 4°C
(c) 15°C
(d) Insufficient data to predict
1815: Total internal reflection can take place when light travels from
(a) diamond to glass
(b) water to glass
(c) air to water
(d) air to glass