Structure of the Atom — Science STD 9 — Question

In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

1. Increasing pressure on hydrogen contained in a closed container.
2. Some hydrogen gas leaking out of the container.
3. Increasing the volume of the container of hydrogen gas.
4. Adding more hydrogen gas to the container without increasing the volume of the container.

Molecular mass is defined as the :

Work done by the gravitational force on a body of mass m moving on a smooth horizontal surface through a distance s is: (Given acceleration due to gravity =g):

A microphone converts:

1. Electrical energy into sound energy in ordinary telephone.
2. Microwave energy into sound energy in a mobile phone.
3. Sound energy into mechanical energy in a stereo system.
4. Sound energy into electrical energy in public address system.

What is the condition of an electromagnetic induction?

Animal cell lacking nuclei would also lack in:

Find out the false sentences.

During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of: