(i) By choosing the instrument carefully.
(ii) Necessary correction is to be made.
(iii) High precision instrument is to be used.
(iv) Proper setting up of experiments is to be done.
(v) Taking proper precautions is a must, while making observations

(i) Diffraction techniques helps to study the crystal structure of various rocks.
(ii) Radioactivity is used to estimate the age of rocks, fossils and the age of the Earth.
(iii) Oceanographers seek to understand the physical and chemical processes of the oceans. They measure parameters such as temperature, salinity, current speed, gas fluxes, chemical components.

(i) Biological studies are impossible without a microscope designed using physics principles.
(ii) The invention of the electron microscope has made it possible to see even the structure of a cell. X-ray and neutron diffraction techniques have helped us to understand the structure of nucleic acids, which help to control vital life processes. X-rays are used for diagnostic purposes.
(iii) Radio-isotopes are used in radiotherapy for the cure of cancer and other diseases. In recent years, biological processes are being studied from the physics point of view.

(i) In physics, we study the structure of atom, radioactivity, X-ray diffraction etc.
(ii) Such studies have' enabled researchers in chemistry to arrange elements in the periodic table on the basis of their atomic numbers.
(iii) This has further helped to know the nature of valence and chemical bonding and to understand the complex chemical structures. Inter-disciplinary branches like Physical chemistry and Quantum chemistry play important roles here.

(i) Basic laws of electricity and magnetism led to the discovery of wireless communication technology which has shrunk the world with effective communication over large distances.
(ii) The launching of satellite into space has revolutionized the concept of communication.
(iii) Microelectronics, lasers, computers, superconductivity and nuclear energy have comprehensively changed the thinking and living style of human beings.