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What are the dangers of electromagnetic waves?

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Description : What are the electromagnetic waves used in remote control?

Description : What is the frequency range of VHF electromagnetic waves? A) 30-300 kHz B) 30-3000 kHz C) 30-300 MHz D) 30-3000 MHz

Answer : What is the frequency range of VHF electromagnetic waves? A) 30-300 kHz B) 30-3000 kHz C) 30-300 MHz D) 30-3000 MHz

Description : What is the speed of an electromagnetic wave in water?

Description : What is an example of an electromagnetic?

Description : What do you mean by electromagnetic field?

Description : What is the definition of electromagnetic force?

Description : How fast is an electromagnetic wave?

Description : Which waves are demodulated by Costas loop? A) VSB B) SSB C) MSK D) DSBSC 

Answer : Which waves are demodulated by Costas loop? A) VSB B) SSB C) MSK D) DSBSC 

Description : State properties of ultrasonic waves.

Answer : i) Frequency of these sound waves is more than 20kHz ii) Shorter wavelength iii) They carry high amount of sound energy iv) The speed of propagation of ultrasonic waves increases with increase in ... . x) Posses certain vibrations which are used as good massage action in case of muscular pain. 

Description : Wave trap is used to trap waves of:  (A) Power frequencies (B) Higher frequencies entering generator or transformer units (C) All of the above (D) None of the above

Answer : Wave trap is used to trap waves of: Higher frequencies entering generator or transformer units

Description : Two waves have frequency of 500 Hz. One is set at its maximum value whereas the other at zero. The phase angle between them will be

Answer : Two waves have frequency of 500 Hz. One is set at its maximum value whereas the other at zero. The phase angle between them will be 90o

Description : Two waves of the same frequency have opposite phase when the phase angle between them is?

Answer : Two waves of the same frequency have opposite phase when the phase angle between them is 180°.

Description : Define Faraday’s first law of electromagnetic induction. 

Answer : Faraday’s First Law: Whenever a changing magnetic flux links with a conductor, an emf is induced in that conductor.  OR  When a conductor cuts across magnetic field, an emf is induced in that conductor.

Description : State advantages & disadvantages of electromagnetic flow meter.

Answer : Advantage: Provides wide linear range. 2) Ability to measure reverses flow. 3) Gives rapid response to flow changes. 4) No obstruction is created to flow. 5) It can handle corrosive as ... and pipe networks with relatively short inside diameters. 3) It is useful for electrically conducting fluid.

Description : i) Explain electromagnetic spectrum with neat diagram. ii) Explain atmospheric noise with example. 

Answer : Explanation:-  The electromagnetic spectrum is the range of frequencies of electromagnetic radiation and their respective wavelengths  The electromagnetic spectrum covers ... spread over the complete frequency spectrum used for radio communication.  Example: Lightning 

Description : Justify electromagnetic wave is said to be transverse wave. 

Answer : Transverse electromagnetic wave:- The electromagnetic waves are oscillations which propagate through free space. In electromagnetic waves the direction of electric field, magnetic field & propagation are ... electric field vector with respect to the surface (i.e. looking at the horizon) 

Description : State Faraday's law of electromagnetic induction.

Answer : First Law: - Whenever change in the magnetic flux linked with a coil or conductor, an EMF is induced in it. OR Whenever a conductor cuts magnetic flux, an EMF is induced in conductor.  Second Law: ... of induced EMF is directly proportional to (equal to) the rate of change of flux linkages.

Description : Why electromagnetic waves are said to be transverse wave ? Explain.

Answer : The electromagnetic waves are oscillations which propagate through free space. In electromagnetic waves the direction of electric field, magnetic field & propagation are mutually perpendicular. Hence electromagnetic waves are called as transverse wave.

Description : 1. How many orangutans disappear each year as result of palm oil farming? 2. Who decides about the reasonableness of the restrictions placed on Fundamental Rights? 3. Microwaves are electromagnetic waves with ... 19. Where is Over 90% of the world's biomass? 20. Who deciphered the Brahmi script?

Answer : Answer : 1. 5000 2. Courts 3. Giga hertz 4. Tundra region 5. Kharavela 6. MRF 7. Lillehammer 8. Javan rhino 9. Evergreen forests 10. Prakrit 11. Directive Principle 12. An atom 13. Rs. 100 ... 16. Arati Saha 17. A greater flamingo 18. Finance Bills 19. In tropical rain forests 20. James Princep

Description : Matter waves are (1) de Broglie waves (2) Electromagnetic waves (3) Transverse waves (4) Longitudinal waves 

Answer :  de Broglie waves 

Description : In the remote control of television, electromagnetic waves used are (1) ultraviolet (2) microwave (3) radiowave (4) infrared

Answer : infrared

Description : When electromagnetic waves are propagated in a waveguide  a) They travel along the walls of the waveguide b) They travel through the dielectric without touching the walls c) They are reflected from the walls but do not travel along the walls d) None of these

Answer : When electromagnetic waves are propagated in a waveguide They travel through the dielectric without touching the walls

Description : Different electromagnetic waves travel through vacuum at different speeds. a. True b. False 

Answer : b. False  

Description : The arrangement of electromagnetic waves according to their wavelengths and frequencies is called the

Answer : electromagnetic spectrum

Description : Which of the following waves is not a transverse wave? w) a wave traveling on a string x) an electromagnetic wave y) a sound wave

Answer : ANSWER: Y -- A SOUND WAVE

Description : Explain the transverse electromagnetic waves in wave propagation.

Answer : 1. The electromagnetic waves are oscillations, which propagate through free space. 2. Em wave travel in free space at the speed of light. 3. Figure shows the simple EM wave, in which the direction of ... electromagnetic waves (TEM). Diagram:- Transverse electromagnetic wave(TEM) OR

Description : 1. The working of optical is based on which of electromagnetic waves? 2. By whom was Cholera bacillus discovered? 3. At present the Rajya Sabha consists of howmany members? 4. Where is the ... that? 19. How are the Himalayan rivers? 20. In Krishnadevaraya's court, who were Ashtadiggajas?

Answer : Answer : 1. Total internal reflection 2. Robert Koch 3. 245 4. East Africa 5. Bhaskara 6. Charles Dickens 7. Lowering bank rate 8. Silicon 9. Patagonia desert 10. Monarchial 11. Alexzander Fleming 12. ... . 16. 3 17. Increases 18. Multiply themselves 19. Snow fed 20. Eight great poets of his court

Description : 1. Who firstly predicated the existence of electromagnetic waves? 2. Who is the winner of Saraswati Samman 2012? 3. When was decimal coinage introduced in India? 4. Why have continents ... makes maximum use of the geothermal energy? 20. Under which Sultan, Khalisa land increased considerably?

Answer : Answer : 1. Maxwell 2. A.A. Manavalan 3. 1957 4. Because of tectonic activities 5. Chandragupta I 6. Ecosystem 7. Nargis Dutt 8. Flint glass 9. Japan Sea 10. Narasimhavarman 11. Amour 12. Mohd. Azharuddin 13 ... 16. Governor 17. Unit north pole 18. V. K. R. V. Rao 19. Iceland 20. Alauddin Khilji

Description : Which of the following statements is not true with respect to microwaves? (A) Electromagnetic waves with frequencies from 300 GHz to 400 THz. (B) Propagation is line-of-sight. (C) Very ... waves cannot penetrate walls. (D) Use of certain portions of the band requires permission from authorities.

Answer : (A) Electromagnetic waves with frequencies from 300 GHz to 400 THz.

Description : These waves cannot be transmitted through vacuum (1) Light (2) Sound (3) Heat (4) Electromagnetic

Answer : Sound

Description : The scientist who first sent electromagnetic waves to distant places is (1) James Clerk Maxwell (2) Heinrich Hertz (3) Thomas Alva Edison (4) John Logie Baird

Answer : Thomas Alva Edison

Answer : The velocity of electromagnetic ratio waves is  3 x 10⁸ m / s.

Answer : Diffraction of electromagnetic waves May occur around the edge of a sharp obstacle.

Description : Which is the most important aspect of the teacher's role in learning? Options: A) The development of insight into what constitutes an adequate performance B) The development of insight ... The provision of encouragement and moral support D) The provision of continuous diagnostic and remedial help

Answer : A) The development of insight into what constitutes an adequate performance 

Description : Which of the following is the least important aspect of the teacher's role in the guidance of learning? Options: A) The development of insight into what constitutes an adequate performance B) The ... avoided C) The provision of continuous diagnostic and remedial help D) The fore-stalling of habits

Answer : B) The development of insight into what constitute the pitfalls and dangers to be avoided

Description : Which is the most important aspect of the teacher's role in learning? (A) The development of insight into what constitutes an adequate performance (B) The development of insight into ... The provision of encouragement and moral support (D) The provision of continuous diagnostic and remedial help

Answer : (C) The provision of encouragement and moral support

Description : UNESCO has as one of its many promising activities, a campaign to provide Options: A) Education for all adults of the member nations B) Universal, free, compulsory primary education C) Free education to those who desires it D) Indoctrination against the dangers of communism

Answer : B) Universal, free, compulsory primary education 

Description : What is the force that holds protons and neutrons together in the nucleus of an atom?

Description : In an electromagnetic wave, the E and B fields are both perpendicular to what?

Answer : ANSWER: THE DIRECTION OF THE WAVE or DIRECTION OF WAVE ROPAG 

Description : 1. Sex determination of child is done by whose chromosome? 2. Who is authorised to decide over a dispute regarding disqualification of a member of Parliament? 3. Who firstly demonstrated ... of bargets, coasters and dredgers? 20. In which country was Buddhism first propogated outside India?

Answer : Answer : 1. Father 2. President 3. Hertz 4. Mahogany 5. Archaeological excavations 6. December 20 7. International Year of Volunteers 8. Increase growth in lenght 9. Tropical moist deciduous ... . Boxing 17. Herbert Spencer 18. During a Financial Emergency 19. Garden Reach Shipyard 20. Srilanka

Description : The rms value of the current in a wire which carries a d.c. current of 10 A and a sinusoidal alternating current of peak value 20 A is  (A) 10 A (B) 14.14 A (C) 15 A (D) 17.32 A

Answer : The rms value of the current in a wire which carries a d.c. current of 10 A and a sinusoidal alternating current of peak value 20 A is 17.32 A

Description : The inductance of a long solenoid of length 1000 mm wound uniformly with 3000 turns on a cylindrical paper tube of 60 mm diameter is  (A) 3.2 µH (B) 3.2 mH (C) 32.0 mH (D) 3.2 H

Answer : The inductance of a long solenoid of length 1000 mm wound uniformly with 3000 turns on a cylindrical paper tube of 60 mm diameter is 32.0 mH

Description : How can a magnetic field be used to generate an electric current?

Answer : Magnetic  field  can  be  used  to  generate  electric  current  on  a  condition  that  it  is  on  a  rate  of  changing  magnetic  flux.  (Faraday's  law)

Description : Why is electromagnetism so important?

Description : How is electromagnetism used today?

Answer : The base of electrical engineering is electromagnetism. You found electromagnetism everywhere in a electrical devices around you.

Description : Sound waves are an example of what type of wave?  

Answer : ANSWER: COMPRESSIONAL or LONGITUDINAL

Description : What are tidal waves called that surge up rivers from narrow estuaries called?

Answer : ANSWER: TIDAL BORES

Description : In the hydrogen atom, the electron and proton are bound together by A. gravitational force. C. nuclear force. E. none of the above. B. electromagnetic force. D. chemical force.

Answer : B. electromagnetic force.

Description : The four underlying equations in electromagnetic theory are called: w) Einstein's Equations x) Maxwell's Equations y) Newton's Equations z) Faraday's Law

Answer : ANSWER: X -- MAXWELL'S EQUATIONS

Description : Beta rays emitted by a radioactive material are (1) The electrons orbiting around the nucleus (2) Charged particles emitted by nucleus (3) Neutral particles (4) Electromagnetic radiations

Answer : Charged particles emitted by nucleus

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