Description : The waves used for sending signals to the satellite from ground station are _____. A. Ultraviolet rays B. X-rays C. Sound waves D. Micro waves
Last Answer : ANSWER: D
Description : A mobile phone sends and receives messages through _____. A. Radio waves B. Ultraviolet waves C. Micro waves D. Sound waves
Last Answer : ANSWER: A
Description : Video camera is used to convert _____. A. Heat into x-rays B. Sound into electrical signals C. Picture into electrical signals D. Electrical signals into pictures
Last Answer : ANSWER: C
Description : X-rays region lies between – (1) Ultraviolet and visible region (2) Visible and infra-red region (3) Gamma-rays and ultraviolet region (4) Short radio waves and long radio waves
Last Answer : (3) Gamma-rays and ultraviolet region Explanation: X-rays region lies between Gamma rays and ultra-violet region.
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 : 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 : Any energy which radiates in the form of radio waves, infrared waves, light waves, x-rays, etc. A. Radiant energy B. Electromagnetic C. Heat D. Ultraviolet
Last Answer : B. Electromagnetic
Description : X-rays region lies between (1) Ultraviolet and visible region (2) Visible and infra-red region (3) Gamma-rays and ultraviolet region (4) Short radio waves and long radio waves
Last Answer : Gamma-rays and ultraviolet region
Description : Coolis tube is used to produce – (1) Radio waves (2) Micro waves (3) X-rays (4) Gama rays
Last Answer : (3) X-rays Explanation: X-rays are part of the electromagnetic spectrum, an ionizing radiation with wavelengths shorter than ultraviolet light. X-ray tubes evolved from experimental Crookes tubes ... X-rays created the field of radiography, the imaging of opaque objects with penetrating radiation.
Description : Which one of the following radiations has the most energetic photon? a) T.V. waves b) Micro waves c) X-rays d) - rays
Last Answer : d) - rays
Description : Coolis tube is used to produce (1) Radio waves (2) Micro waves (3) X-rays (4) Gama rays
Last Answer : X-rays
Description : What do radioactive substances emit? (1) Radio waves (2) Infrared waves (3) Ultraviolet waves (4) α, β and γ rays
Last Answer : (4) α, β and γ rays Explanation: Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.
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 : Ozone saves the biosphere by absorbing high energy radiations called _____ . (1) Infra-red (IR) (2) Gamma rays (3) Ultraviolet rays (UV) (4) X–rays
Last Answer : Ultraviolet rays (UV)
Description : Every hot object emits _____ (1) X–rays (2) Visible light (3) Infrared rays (4) Ultraviolet rays
Last Answer : Infrared rays
Description : Growth of the baby in the uterus is found using - (1) X-rays (2) Gamma rays (3) Ultra sound (4) Ultraviolet rays
Last Answer : (3) Ultra sound Explanation: Ultrasound is a technique that uses sound waves to show a picture of a baby (fetus) in the uterus. It works by bouncing sound waves off the developing fetus. Echoes ... moving or still picture, called 43$ a sonogram, on a screen. The technique is also called sonography.
Description : Growth of the baby in the uterus is found using (1) X-rays (2) Gamma rays (3) Ultra sound (4) Ultraviolet rays
Last Answer : Ultra sound
Description : For sending sound waves at large distance, which waves are used? A. Infrared waves B. Radio waves C. Light waves D. X-waves
Last Answer : ANSWER: B
Description : Bats can also fly in dark because they are capable of taking the help of _____ A. Ultraviolet Waves B. Ultrasonic Waves C. Electromagnetic Waves D. Special Retina
Description : A term related to sending data to a satellite is _____: a) down link b) modulate c) demodulate d) up link e) interrelate
Last Answer : d) up link
Description : Radar transmits short pulses of high frequency called A. Infrared waves B. Radio waves C. Ultraviolet waves D. Sound waves
Description : Which of the following waves are diffracted by an obstacle of size 1 cm? (a) Light waves (b) Sound waves (c) Ultrasonic waves (d) X-rays
Last Answer : Ans:(c)
Description : All of the following are electromagnetic radiations except-----? A. Red light B. Sound waves (Answer) C. X-Rays D. Photon
Last Answer : B. Sound waves (Answer)
Description : Which one of the following waves requires a material medium for their propagation? a) Light waves b) X– rays c) -rays d) Sound waves
Last Answer : d) Sound waves
Description : The term "laminar flow" is most often associated with the description of: w) conduction of sound by waves x) current flow in transistors y) effects of viscosity of liquids z) passage of light rays through a liquid
Last Answer : ANSWER: Y -- EFFECTS OF VISCOSITY OF LIQUIDS
Description : Which of the following does NOT travel in a vacuum? w) radio waves x) gamma rays y) magnetic waves z) sound waves
Last Answer : ANSWER: Z -- SOUND WAVES
Description : Bats can sense obstacles because they produce – (1) supersonic sound waves (2) ultrasonic sound waves (3) infrasonic sound waves (4) micro sound waves
Last Answer : (2) ultrasonic sound waves Explanation: The reason that bats use ultrasound is because it has such a high frequency and it has a low diffraction or it bends less. They use this sound to do a ... come faster in a particular area than the rest of the sounds then they know that something is near.
Description : The waves used in sonography are – (1) Micro waves (2) Infra-red waves (3) Sound waves (4) Ultrasonic waves
Last Answer : (4) Ultrasonic waves Explanation: Sonography is an ultrasoundbased diagnostic imaging technique used for visualizing internal body structures including tendons, muscles, joints, vessels and internal organs for possible pathology or lesions.
Description : The waves used in sonography are (1) Micro waves (2) Infra-red waves (3) Sound waves (4) Ultrasonic waves
Last Answer : Ultrasonic waves
Description : Bats can sense obstacles because they produce (1) supersonic sound waves (2) ultrasonic sound waves (3) infrasonic sound waves (4) micro sound waves
Last Answer : ultrasonic sound waves
Description : Designed to receive a signal from a transmitting station on the ground and retransmit it to a receiving station located elsewhere A. Communication satellite B. Repeater C. Relay station D. Transponder
Last Answer : A. Communication satellite
Description : A ground station is operating to a geostationary satellite at a 5° angle of elevation. Calculate the round-trip time between ground station and satellite. A. 275 s B. 275 ms C. 137.5 s D. 137.5 ms
Last Answer : B. 275 ms
Description : What satellite subsystem monitors onboard conditions such as temperature and battery voltage and transmits this data back to a ground station for analysis? A. Communications subsystem B. AKM C. TTC D. Transponder
Last Answer : C. TTC
Description : A satellite receives an uplink frequency of _______ MHz from a ground station of 3700 MHz. A. 8150 MHz B. 1475 MHz C. 2225 MHz D. 5925 MHz
Last Answer : D. 5925 MHz
Description : Moving electric charge produces - (1) magnetic field (2) sound waves (3) light rays (4) heat waves
Last Answer : (1) magnetic field Explanation: An electric charge always produces an electric field, regardless of speed, and a moving charge generates a magnetic field. An electric current passing through a conductor produces a magnetic field because it has many charges in motion.
Description : Which of the following does NOT travel in a vacuum? A. Radio waves B. Gamma rays C. Magnetic waves D. Sound waves
Last Answer : D. Sound waves
Description : Moving electric charge produces : (1) magnetic field (2) sound waves (3) light rays (4) heat waves
Last Answer : magnetic field
Description : Conversion of a procarcinogen into a carcinogen often requires (A) Proteolysis (B) Microsomal hydroxylation (C) Exposure to ultraviolet radiation (D) Exposure to X-rays
Last Answer : Answer : B
Description : Ozone protects biosphere from – (1) X-rays (2) Gamma rays (3) Ultraviolet rays (4) Infrared rays
Last Answer : (3) Ultraviolet rays Explanation: Ozone is an allotrope of oxygen that is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges. The ozone layer in ... radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.