MCQs in Electrotherapy

MCQs in Electrotherapy S Sangeetha Mohan BPT, MIAP

Assistant Professor of Physiotherapy AMS College of Paramedical Sciences, Chennai

KG Smitha BPT, MIAP

Assistant Professor of Physiotherapy AMS College of Paramedical Sciences, Chennai

JAYPEE BROTHERS MEDICAL PUBLISHERS (P) LTD New Delhi

Published by Jitendar P Vij Jaypee Brothers Medical Publishers (P) Ltd EMCA House, 23/23B Ansari Road, Daryaganj New Delhi 110 002, India Phones: +91-11-23272143, +91-11-23272703, +91-11-23282021, +91-11-23245672 Fax: +91-11-23276490, +91-11-23245683 e-mail: [email protected] Visit our website: www.jaypeebrothers.com Branches • 202 Batavia Chambers, 8 Kumara Krupa Road, Kumara Park East Bangalore 560 001, Phones: +91-80-22285971, +91-80-22382956, +91-80-30614073 Tele Fax: +91-80-22281761 e-mail: [email protected] • 282 IIIrd Floor, Khaleel Shirazi Estate, Fountain Plaza Pantheon Road, Chennai 600 008, Phones: +91-44-28262665, +91-44-28269897 Fax: +91-44-28262331 e-mail: [email protected] • 4-2-1067/1-3, Ist Floor, Balaji Building, Ramkote Cross Road, Hyderabad 500 095, Phones: +91-40-55610020, +91-40-24758498 Fax: +91-40-24758499 e-mail: [email protected] • 1A Indian Mirror Street, Wellington Square Kolkata 700 013, Phone: +91-33-22451926 Fax: +91-33-22456075 e-mail: [email protected] • 106 Amit Industrial Estate, 61 Dr SS Rao Road, Near MGM Hospital Parel, Mumbai 400 012, Phones: +91-22-24124863, +91-22-24104532, +91-22-30926896 Fax: +91-22-24160828 e-mail: [email protected] MCQs in Electrotherapy © 2006, S Sangeetha Mohan, KG Smitha All rights reserved. No part of this publication should be reproduced, stored in a retrieval system, or transmitted in any form or by any means: electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the authors and the publisher. This book has been published in good faith and belief that the material provided by authors is original. Every effort is made to ensure accuracy of material, but the publisher, printer and authors will not be held responsible for any inadvertent error(s). In case of any dispute, all legal matters to be settled under Delhi jurisdiction only. First Edition : 2006 ISBN 81-8061-575-8 Typeset at

JPBMP typesetting unit

Printed at Repro India Limited

Foreword I am delighted to pen the foreword for this book titled MCQs in Electrotherapy. There are many books available in the field of Physiotherapy, whereas a book on MCQs in Electrotherapy is the first of its kind in India. I appreciate the extensive research conducted by the authors who have presented the book in an easy way for the students to be benefited. The authors Dr S Sangeetha Mohan and Dr KG Smitha are well known to me as my students and staff for many years. I applaud their efforts in touching almost all the branches of Electrotherapy. I wish this book a great success! Dr R Srinivasan BPT, MPT, MIAP Senior Physiotherapist Faculty in Physiotherapy Govt. College of Physiotherapy Govt. Institute of Rehabilitation Medicine

Preface There was always a need that existed in the students community of physiotherapy for a comprehensive aid to study Electrotherapy. Here, we have made an attempt to realise the same by writing a book called MCQs in Electrotherapy. This is prepared and written by us for quick reference and effective study of the subject Electrotherapy by the students of Physiotherapy. This short book will act as a companion for Clayton’s cElectrotherapy. We welcome the valuable suggestions, comments made by the students and readers of this book so that they can be incorporated in the future edition. We are greatly indebted to M/s Jaypee Brothers Medical Publishers (P) Limited, New Delhi, for bringing the speedy publication of this book. S Sangeetha Mohan KG Smitha

Contents 1. Low Frequency Currents ............................................................ 1 2. High Frequency Currents ......................................................... 57

Acknowledgements Without family, no where we reach....... Our heartfelt gratitude to our parents Mr and Mrs K Sukumaran and Mr and Mrs K Gopala Krishnan and to our family members Mr P Mohan, for their tremendous support and encouragement. We are thankful to our Secretary Janab S Segu Jamaludeen, AMS College of Paramedical Sciences, Chennai, for having opened this avenue to us. We express our sincere gratitude to Dr V Deivasigamani, PT, Dr (Mrs) Janaki Natarajan, PT, Dr R Srinivasan , PT, Dr Y Rajalakshmi, Physiologist, for their impetus given to us to write the book. We are extremely thankful to Mrs Shanthi Rosalind, Sociologist, Mr Govindan Librarian and to all our departmental colleagues for their continued support and encouragement. We are greatly indebted to our dear friends, close to our hearts for their tremendous support and help. Last but not the least our heartfelt gratitude to our beloved students; without them this would not have happened. We are grateful to Shri JP Vij, Chairman and Managing Director of M/s Jaypee Brothers Medical Publishers (P) Ltd., for his inspiration given to us to do this work. We are grateful to Mr R Jayanandan Author Co-ordinator of M/s Jaypee Brothers Medical Publishers (P) Ltd., Chennai, for his encouragement and guidance for the preparation of the script.

Low Frequency Currents 1

Low Frequency Currents PHYSICS 1. Isotopes of an element has: A. Same physical properties B. Same physical and chemical properties C. Same chemical properties D. Same physical but different chemical properties 2. An isotope is an atom of an element: A. With same atomic number B. With same atomic mass C. With different atomic number D. Equal number of protons and neutrons 3. A transistor is the combination of: A. Two junction diodes B. P–type semiconductor alone C. 3 junction diode D. N– type semiconductors alone 4. The transistor will conduct only when its emitter base junction is: A. Grounded B. Forward biased C. Reverse biased D. Biased with high potential 5. Capacitance of a conductor is: A. Ratio of the charge to its potential B. Product of its charges and resistance C. Ratio of its potential to the charge D. Product of charges and its potential 1 C

2 A

3 A

4

B

5 D

2 MCQs in Electrotherapy 6. The inductance of a conductor in which an emf of 1 volt is induced by a current of 1 ampere per second is: A. 0.5 Henry B. 1 Watt C. 1 Henry D. 1 Farad 7. The ability of an object to hold an electrical charge is known as: A. Potential of the object B. Electromotive force C. Capacitance of the object D. Repelling power of the object 8. The unit of the repelling power existing between like charged particles is: A. Watt B. Henry C. Farad D. Volt 9. That emf which produces a current of 1 ampere when applied to a conductor of resistance of 1 Ohm is known as: A. 1 Volt B. 1 Coulomb C. 1 Watt D. 10 Volt 10. The rate of flow of one coulomb of electrons per second is: A. 1 Ampere B. 1 Milli Ampere C. 103 Ampere D. 10 –6 Ampere 11. One Ampere of current when flows through 2 straight parallel wires placed 1 meter apart in a vacuum produces between them: A. A force of 10 –7 Newton per meter length of wire B. Force of 2 × 10 7 Newton per meter length of wire C. Force of 2 × 10 –7 Newton per meter length of wire D. Force of 10 7 Newton per meter length of wire 12. The quantity of electricity which passes any given point when a current of 1 ampere flows for a second is: A. 1 Coulomb B. 10 3 Coulomb 18 C. 6.26 × 10 Coulomb D. 6.26 × 10 –18 Coulomb 6 C

7 C

8 D

9

A

10 A

11 C

12 A

Low Frequency Currents 3 13. When 1 Coulomb of electricity is used to charge a body to 1 volt, the capacity of the object is: A. 10 –6 Farad B. 1 Microfarad C. 1 Farad D. 1 Picofarad 14. “For electromagnetic waves to have an effect on the tissues, they must be absorbed”–which law is this: A. Snell’s law B. Inverse square law C. Cosine law D. Grothus law 15. The ability of a conductor to have an electric current induced in it is known as: A. Impedance B. Potential difference C. Inductance D. Electromotive force 16. The inductance of a conductor in which a current of 1 ampere induces an emf of 1 volt is: A. 1 Henry B. 1 Farad C. 1 Newton D. 1 Watt 17. The unit of energy is: A. Calorie C. Joule

B. Newton D. Watt

18. The rate of flow of 6.26 × 10 18 electrons per second is: A. 1 Coulomb B. 1 Volt C. 1 Ampere D. 1 Joule 19. 1 Coulomb of charge is equivalent to: A. 6.26 × 10 18 Electrons B. 62.6 × 10 18 Electrons C. 626 × 10 18 Electrons D. 2.66 × 10 18 Electrons

13 C

14 D

15 C

16

A

17 C

18 A

19 A

Salient Features •

The book acts as a companion for the Clayton’s Electrotherapy

•

It provides quick reference and serves as an efficient study tool

•

A comprehensive aid for exam

•

Clarifies subject through knowledge testing

•

The book helps for the students to evaluate and prepare for a question-based material.

ISBN 81-8061-575-8

9 788180 615757