Describe an inclined plane and a screw with the help of examples where they are used in daily life.

Describe a palindrome with the help of an example.

Describe the phenomenon electrolysis with the help of two examples.

Name any six simple machines that we use in daily life.

List four examples of thermal expansion in daily life.

A small disc can slide in a circular path on a frictionless inclined plane inclined at an angle of 30^(@) with the help of a thread as shown. Mass of the disc is m and acceleration due to gravity is g . If the disc is released, when the thread is horizontal, expression for the tension in the thread at the lowest point is

With the help of a suitable example, describe reflex action.

Give two examples where we use wedges as simple machines.

A block of mass m is directly pulled up slowly on a smooth inclined plane of height h and inclination theta with the help of a string parallel to the incline. Which of the following statement is incorrect for the block when it moves up from the bottom to the top the incline? . .

Define the term catalyst. Write one example where it is used.

(a) What is adaptive radiation. (b) Explain with the help of suitable example where adaptive radiation has occurred to represent convergent evolution.