Electronic devices that consist of minute microphone that picks up sound waves and converts them
into electric current which is amplified and passes to a miniature loud speaker that fits into the ear
are called:
i. Transistor radio
ii. Hearing aid
iii. Amplifier
iv. Head phone

What is diathermy. In which condition is it effective? 

Discuss advantages of dietary survey in detail

How are radioisotopes useful in the medical field? Briefly describe, giving specific examples. 

. Why is fibre important in daily diet, list important sources of fibre.

 Describe the relationship between high blood pressure and thickening or arteries.

Nucleic acids are central to the very life process itself. Explain their role in living organisms. . 

Rays absorbed by heavier materials like calcium and phosphorus and which can pass through the
tissues of human body and not through bones are:
i. Light rays
ii. Sound waves
iii. X-rays
iv. Infra-red rays