Description : To measure the speed of an approaching car a police officer shines – (1) light waves on it (2) microwaves on it (3) radio waves on it (4) ultra high frequency waves on it
Last Answer : (3) radio waves on it Explanation: Radar, which stands for radio detection and ranging, is a system that uses reflected radio waves to detect objects and measure their distance and speed. For example, police use radar to calculate the speed of cars.
Description : Which wave has the highest frequency? w) microwaves x) infrared waves y) ultraviolet waves z) radio waves
Last Answer : ANSWER: Y -- ULTRAVIOLET WAVES
Description : Radio waves, microwaves, infra-red spectrum, ultraviolet rays, X-rays and gamma rays are classified as ______. (1) light waves (2) electromagnetic waves (3) electric waves (4) magnetic waves
Last Answer : (2) electromagnetic waves Explanation: Electromagnetic radiation is the radiant energy released by certain electromagnetic processes. It consists of electromagnetic waves which are synchronized oscillations of electric and magnetic fields that propagate at the speed of light through a vacuum.
Description : Of the following, the most energetic form of NON-IONIZING radiation is: w) ultra-violet light x) infra-red light y) radar z) microwaves
Last Answer : ANSWER: W -- ULTRA-VIOLET LIGHT
Description : Which of the following is used in oven? (1) X-rays (2) UV-rays (3) Microwaves (4) Radio waves
Last Answer : (3) Microwaves Explanation: An oven is a thermally insulated chamber used for the heating, baking or drying of a substance and most commonly used for cooking.
Description : Waves that are required for long distance wireless communication are – (1) Infrared rays (2) Ultraviolet rays (3) Radio waves (4) Microwaves
Last Answer : (3) Radio waves Explanation: Wireless communication is the transfer of information between two or more points that are not connected by an electrical conductor. With radio waves distances can be short ... , or as far as thousands or even millions of kilometres for deep-space radio communications.
Description : Waves that are required for long distance wireless communication are (1) Infrared rays (2) Ultraviolet rays (3) Radio waves (4) Microwaves
Last Answer : Radio waves
Description : Which of the following waves cannot be polarized? (1) Radio (2) Ultra violet (3) Infrared (4) Ultrasonic
Last Answer : (4) Ultrasonic Explanation: Only transverse waves (such as radio, ultraviolet and infrared waves) can be polarized since their vibrations can potentially occur in all directions perpendicular to the direction of travel. It is therefore possible to confine the vibrations to a single plane.
Description : The ozone layer protects us from - (1) Ultra violet rays (2) Radio waves (3) Visual radiation (4) Infrared radiation
Last Answer : (1) Ultra violet rays Explanation: The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
Description : Which of the following waves cannot be polarised? (1) Radio (2) Ultra violet (3) Infrared (4) Ultrasonic
Last Answer : Ultrasonic
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.
Last Answer : (A) Electromagnetic waves with frequencies from 300 GHz to 400 THz.
Description : ________ are usedfor short-range communications such as those between a PC and aperipheral device. A) Radio waves B) Microwaves C) Infrared waves D) none of the above
Last Answer : Infrared waves
Description : _____ are used for cellular phone, satellite,and wireless LAN communications. A) Radio waves B) Microwaves C) Infrared waves D) none of the above
Last Answer : Microwaves
Description : …….are used for short-range communications such as those between a PC and aperipheral device. a. Radio waves b. None of These c. Microwaves d. Infrared waves
Last Answer : d. Infrared waves
Description : ……………are used for cellular phone, satellite, and wireless LAN communications. a. Microwaves b. Radio waves c. None of these d. Infrared waves
Last Answer : a. Microwaves
Description : Microwaves are electromagnetic waves with frequency, in the range of which unit? -Do You Know?
Last Answer : Microwaves have frequencies ranging from about 1 billion cycles per second, or 1 gigahertz (GHz), up to about 300 gigahertz and wavelengths of about 30 centimeters (12 inches) to 1 millimeter (0.04 inches),
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?
Last 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 : Which of the following has the highest energy? A. gamma rays (Answer) B. X-rays C. Ultra-violet radiation D. radio waves
Last Answer : A. gamma rays (Answer)
Description : A radio frequency in the ultra high frequency band of the radio spectrum band. A. 235.50 MHz B. 450.50 MHz C. 150.50 GHz D. 0.31250 GHz
Last Answer : D. 0.31250 GHz
Description : They wrote a paper describing how it was possible to use stimulated emission for amplifying light waves (laser) as well as microwaves (maser). ∙ A. Theodore Maiman ∙ B. KC Kao and GA Bockham ∙ C. Charles Townes and Arthur Schawlow ∙ D. Kapron, Keck and Maurer
Last Answer : C. Charles Townes and Arthur Schawlow
Description : They wrote a paper describing how it was possible to use stimulated emission for amplifying light waves (laser) as well as microwaves (maser).
Last Answer : Charles Townes and Arthur Schawlow
Description : What kind of physics does a police officer need for investigating car accidents?
Last Answer : K=½mv² is about as complex as it gets for either. Physics isn’t the hard part about forensics though.
Description : Geodimeter is based on: (A) Propagation of modulated light waves (B) Propagation of infrared radiation (C) The visible light as carrier with frequency of the order of 5 × 1014 Hz (D) High frequency radio waves
Last Answer : Answer: Option A
Description : Which of the following has the lowest frequency? (1) Visible light (2) Gamma rays (3) Xrays (4) Ultra violet rays
Last Answer : (1) Visible light Explanation: The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide over current protection of an electrical circuit ... or strip that melts when too much current flows through it, thereby interrupting the flow of current.
Last Answer : Visible light
Description : Which among the following waves is used for communication by artificial satellites? (1) Micro waves (2) Radio waves (3) A. M. (4) Frequency of 1016 series
Last Answer : (1) Micro waves Explanation: For fixed (point-to-point) services, communications satellites provide a microwave radio relay technology complementary to that of communication cables. They are also used ... is extensively used for point-to-point telecommunications (i.e., non broadcast uses).
Description : As compared to sound waves the frequency of radio waves is A. lower B. higher C. equal D. may be higher or lower
Last Answer : higher
Description : Which among the following waves is used for communication by artificial satellites ? (1) Micro waves (2) Radio waves (3) A. M. (4) Frequency of 1016 series
Last Answer : Micro waves
Description : Decibel is the unit used for – (1) Speed of light (2) Intensity of heat (3) Intensity of sound (4) Radio wave frequency
Last Answer : (3) Intensity of sound Explanation: The decibel (abbreviated dB) is the unit used to measure the intensity of a sound. The decibel scale is a little odd because the human ear is incredibly ... of a physical quantity (usually power or intensity) relative to a specified or implied reference level.
Description : Decibel is the unit used for (1) Speed of light (2) Intensity of heat (3) Intensity of sound (4) Radio wave frequency
Last Answer : Intensity of sound
Description : Infiber optics, thesignal is_______ waves. A) light B) radio C) infrared D) very low-frequency
Last Answer : light
Description : The crack of a bullwhip results from the bullwhip's tip: w) approaching the speed of sound x) exceeding the speed of sound y) moving with constant velocity z) none of the above
Last Answer : ANSWER: X -- EXCEEDING THE SPEED OF SOUND
Description : Waves approaching the shore is known as – (1) Swash (2) Tsunami (3) Currents (4) Tide
Last Answer : (2) Tsunami Explanation: Tsunamis have a small amplitude (wave height) offshore, and a very long wavelength (often hundreds of kilometers long, whereas normal ocean waves have a wavelength of only 30 ... above the normal sea surface. They grow in height when they reach shallower water or the coast.
Description : Microwaves can be focused and reflected in the same way as what other type of waves?
Last Answer : Light waves.
Description : Waves approaching the shore is known as (1) Swash (2) Tsunami (3) Currents (4) Tide
Last Answer : Tsunami
Description : Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit (1) X-rays (2) ultraviolet light (3) (4) All of the above (4) radio waves
Last Answer : (4) All of the above Explanation: A light-emitting diode (LED) is a semiconductor light source that emits light when current flows through it. Infrared LEDs are used in remote-control circuits, such as those used with a wide variety of consumer electronics.
Description : Laser is a device to produce - (1) a beam of white light (2) coherent light (3) microwaves (4) X-rays
Last Answer : (2) coherent light Explanation: In physics, two wave sources are perfectly coherent if they have a constant phase difference and the same frequency, and the same waveform. Coherence is an ideal property of waves that enables stationary (i.e. temporally and spatially constant) interference.
Description : A solar cell does NOT respond to red light, but DOES respond to green light. The solar cell will be able to respond to: w) microwaves x) infra-red light y) ultraviolet light z) all of the above
Last Answer : ANSWER: Y -- ULTRAVIOLET LIGHT
Description : Old Mr. Tilly was found dead in his study by Mr. Foster. Mr. Foster recounted his dismal discovery to the police. 'I was walking by Mr. Tilly`s house when I thought I would just pop in for a ... arrested Mr. Foster for the murder of Mr. Tilly. How did he know Mr. Foster was lying? -Riddles
Last Answer : Frost forms on the inside of the window, not the outside. So Mr. Foster could not have wiped it off to discover Mr. Tilly`s body.
Description : What does Sending out a pulse of high frequency radio waves?
Last Answer : Need answer
Description : What Palindromes for Sending out a pulse of high frequency radio waves?
Last Answer : radar
Description : Radar transmits short pulses of high frequency called A. Infrared waves B. Radio waves C. Ultraviolet waves D. Sound waves
Last Answer : ANSWER: B
Description : Why does a bubble of water shines?
Last Answer : – Because of total internal reflection
Description : Stationary wave is formed by – (1) a transverse wave superposing a longitudinal wave (2) two waves of the same speed superposing (3) two waves of same frequency travelling in the same direction (4) two waves of same frequency travelling in the opposite direction
Last Answer : (4) two waves of same frequency travelling in the opposite direction Explanation: Stationary or standing waves are formed in a medium when two waves having equal amplitude and frequency moving in ... and the reflected wave. Both longitudinal and transverse types of waves can form a stationary wave.
Description : Two waves, each of amplitude 1.5 mm and frequency 10 Hz, are travelling in opposite direction with a speed of 20 mm/s. The distance in mm between adjacent nodes is : (1) 1.0 (2) 1.2 (3) 1.5 (4) 2.0
Last Answer : (1) 1.0 Explanation: Since the amplitudes, frequency and the speed of both the waves are in same, hence the wavelength of the composite wave will be the same as the single wave.
Description : Stationary wave is formed by (1) a transverse wave superposing a longitudinal wave (2) two waves of the same speed superposing (3) two waves of same frequency travelling in the same direction (4) two waves of same frequency travelling in the opposite direction
Last Answer : two waves of same frequency travelling in the opposite direction
Last Answer : 2mm