Which one among the following waves are called waves of heat energy?

The position-time (x – t) graph for motion of a body is given below :

Which one among the following is depicted by the above graph?

Two copper wires A and B of length l and 2l respectively, have the same area of cross-section. The ratio of the resistivity of wire A to the resistivity of wire B is

Which one among the following is the largest monkey?

Birds like Flamingos can stand on one leg. Which among the following statements relating to this is/are correct?

1. By standing on one leg Flamingos can conserve body heat and energy because they can reduce great deal of surface area for the loss of heat.
2. By standing on one leg, one Flamingo makes a courtship display, which is a part of ritual prior to reproduction.

Select the correct answer using the code given below :

The main function of the inner bark of a woody plant is to