155699
Which one of the following statements is not correct?
1 Ultrasonic waves cannot get reflected, refracted or absorbed.
2 Ultrasonic waves are used to detect the presence of defects like cracks, porosity, etc. in the internal structure of common structure materials
3 Ultrasonic waves can be used for making holes in very hard materials like diamond.
4 Ultrasonic waves cannot travel through vacuum.
Explanation:
A Ultrasonic waves vibrate at a frequency greater than the audible range for humans. They have smaller wavelengths. In low viscosity liquids, ultrasonic waves produce vibration. They undergo reflection, refraction and absorption.
NDA (II) 2017
Electromagnetic Wave
155701
Which one of the following waves does not belong to the category of the other three?
1 X-rays
2 Microwaves
3 Radio waves
4 Sound waves
Explanation:
D Sound wave is an example of mechanical wave which needs medium to travel while X-rays, radio waves and microwaves are the example of electromagnetic waves which do not need any medium to travel.
NDA (II) 2017
Electromagnetic Wave
155702
Bats detect obstacles in their path by receiving the reflected
1 Infrasonic waves
2 Ultrasonic waves
3 Radio waves
4 Microwaves
Explanation:
B Bats detects obstacles in their path by receiving the reflected ultrasonic waves.
NDA (II) 2017
Electromagnetic Wave
155703
The electromagnetic wave used in LASIK eye surgery is
1 Ultraviolet ray
2 X-ray
3 Microwave
4 Radio wave
Explanation:
A LASIK eye surgery removes the clear covering of the cornea to improve vision. The UV rays are used in this. UV rays have a shorter wavelength that can be focused on to very narrow beams for high precision work.
AMU-2017
Electromagnetic Wave
155705
Which one of the following waves is used for detecting forgery in currency notes?
1 Ultraviolet waves
2 Infrared waves
3 Radio waves
4 Microwaves
Explanation:
A Ultraviolet waves are used for detecting forgery in currency notes. The paper currency has a strip that is embedded in the note. This strip cannot be forged like that in the original currency. So, to detect forgery in currency notes, ultraviolet waves are used.
155699
Which one of the following statements is not correct?
1 Ultrasonic waves cannot get reflected, refracted or absorbed.
2 Ultrasonic waves are used to detect the presence of defects like cracks, porosity, etc. in the internal structure of common structure materials
3 Ultrasonic waves can be used for making holes in very hard materials like diamond.
4 Ultrasonic waves cannot travel through vacuum.
Explanation:
A Ultrasonic waves vibrate at a frequency greater than the audible range for humans. They have smaller wavelengths. In low viscosity liquids, ultrasonic waves produce vibration. They undergo reflection, refraction and absorption.
NDA (II) 2017
Electromagnetic Wave
155701
Which one of the following waves does not belong to the category of the other three?
1 X-rays
2 Microwaves
3 Radio waves
4 Sound waves
Explanation:
D Sound wave is an example of mechanical wave which needs medium to travel while X-rays, radio waves and microwaves are the example of electromagnetic waves which do not need any medium to travel.
NDA (II) 2017
Electromagnetic Wave
155702
Bats detect obstacles in their path by receiving the reflected
1 Infrasonic waves
2 Ultrasonic waves
3 Radio waves
4 Microwaves
Explanation:
B Bats detects obstacles in their path by receiving the reflected ultrasonic waves.
NDA (II) 2017
Electromagnetic Wave
155703
The electromagnetic wave used in LASIK eye surgery is
1 Ultraviolet ray
2 X-ray
3 Microwave
4 Radio wave
Explanation:
A LASIK eye surgery removes the clear covering of the cornea to improve vision. The UV rays are used in this. UV rays have a shorter wavelength that can be focused on to very narrow beams for high precision work.
AMU-2017
Electromagnetic Wave
155705
Which one of the following waves is used for detecting forgery in currency notes?
1 Ultraviolet waves
2 Infrared waves
3 Radio waves
4 Microwaves
Explanation:
A Ultraviolet waves are used for detecting forgery in currency notes. The paper currency has a strip that is embedded in the note. This strip cannot be forged like that in the original currency. So, to detect forgery in currency notes, ultraviolet waves are used.
155699
Which one of the following statements is not correct?
1 Ultrasonic waves cannot get reflected, refracted or absorbed.
2 Ultrasonic waves are used to detect the presence of defects like cracks, porosity, etc. in the internal structure of common structure materials
3 Ultrasonic waves can be used for making holes in very hard materials like diamond.
4 Ultrasonic waves cannot travel through vacuum.
Explanation:
A Ultrasonic waves vibrate at a frequency greater than the audible range for humans. They have smaller wavelengths. In low viscosity liquids, ultrasonic waves produce vibration. They undergo reflection, refraction and absorption.
NDA (II) 2017
Electromagnetic Wave
155701
Which one of the following waves does not belong to the category of the other three?
1 X-rays
2 Microwaves
3 Radio waves
4 Sound waves
Explanation:
D Sound wave is an example of mechanical wave which needs medium to travel while X-rays, radio waves and microwaves are the example of electromagnetic waves which do not need any medium to travel.
NDA (II) 2017
Electromagnetic Wave
155702
Bats detect obstacles in their path by receiving the reflected
1 Infrasonic waves
2 Ultrasonic waves
3 Radio waves
4 Microwaves
Explanation:
B Bats detects obstacles in their path by receiving the reflected ultrasonic waves.
NDA (II) 2017
Electromagnetic Wave
155703
The electromagnetic wave used in LASIK eye surgery is
1 Ultraviolet ray
2 X-ray
3 Microwave
4 Radio wave
Explanation:
A LASIK eye surgery removes the clear covering of the cornea to improve vision. The UV rays are used in this. UV rays have a shorter wavelength that can be focused on to very narrow beams for high precision work.
AMU-2017
Electromagnetic Wave
155705
Which one of the following waves is used for detecting forgery in currency notes?
1 Ultraviolet waves
2 Infrared waves
3 Radio waves
4 Microwaves
Explanation:
A Ultraviolet waves are used for detecting forgery in currency notes. The paper currency has a strip that is embedded in the note. This strip cannot be forged like that in the original currency. So, to detect forgery in currency notes, ultraviolet waves are used.
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Electromagnetic Wave
155699
Which one of the following statements is not correct?
1 Ultrasonic waves cannot get reflected, refracted or absorbed.
2 Ultrasonic waves are used to detect the presence of defects like cracks, porosity, etc. in the internal structure of common structure materials
3 Ultrasonic waves can be used for making holes in very hard materials like diamond.
4 Ultrasonic waves cannot travel through vacuum.
Explanation:
A Ultrasonic waves vibrate at a frequency greater than the audible range for humans. They have smaller wavelengths. In low viscosity liquids, ultrasonic waves produce vibration. They undergo reflection, refraction and absorption.
NDA (II) 2017
Electromagnetic Wave
155701
Which one of the following waves does not belong to the category of the other three?
1 X-rays
2 Microwaves
3 Radio waves
4 Sound waves
Explanation:
D Sound wave is an example of mechanical wave which needs medium to travel while X-rays, radio waves and microwaves are the example of electromagnetic waves which do not need any medium to travel.
NDA (II) 2017
Electromagnetic Wave
155702
Bats detect obstacles in their path by receiving the reflected
1 Infrasonic waves
2 Ultrasonic waves
3 Radio waves
4 Microwaves
Explanation:
B Bats detects obstacles in their path by receiving the reflected ultrasonic waves.
NDA (II) 2017
Electromagnetic Wave
155703
The electromagnetic wave used in LASIK eye surgery is
1 Ultraviolet ray
2 X-ray
3 Microwave
4 Radio wave
Explanation:
A LASIK eye surgery removes the clear covering of the cornea to improve vision. The UV rays are used in this. UV rays have a shorter wavelength that can be focused on to very narrow beams for high precision work.
AMU-2017
Electromagnetic Wave
155705
Which one of the following waves is used for detecting forgery in currency notes?
1 Ultraviolet waves
2 Infrared waves
3 Radio waves
4 Microwaves
Explanation:
A Ultraviolet waves are used for detecting forgery in currency notes. The paper currency has a strip that is embedded in the note. This strip cannot be forged like that in the original currency. So, to detect forgery in currency notes, ultraviolet waves are used.
155699
Which one of the following statements is not correct?
1 Ultrasonic waves cannot get reflected, refracted or absorbed.
2 Ultrasonic waves are used to detect the presence of defects like cracks, porosity, etc. in the internal structure of common structure materials
3 Ultrasonic waves can be used for making holes in very hard materials like diamond.
4 Ultrasonic waves cannot travel through vacuum.
Explanation:
A Ultrasonic waves vibrate at a frequency greater than the audible range for humans. They have smaller wavelengths. In low viscosity liquids, ultrasonic waves produce vibration. They undergo reflection, refraction and absorption.
NDA (II) 2017
Electromagnetic Wave
155701
Which one of the following waves does not belong to the category of the other three?
1 X-rays
2 Microwaves
3 Radio waves
4 Sound waves
Explanation:
D Sound wave is an example of mechanical wave which needs medium to travel while X-rays, radio waves and microwaves are the example of electromagnetic waves which do not need any medium to travel.
NDA (II) 2017
Electromagnetic Wave
155702
Bats detect obstacles in their path by receiving the reflected
1 Infrasonic waves
2 Ultrasonic waves
3 Radio waves
4 Microwaves
Explanation:
B Bats detects obstacles in their path by receiving the reflected ultrasonic waves.
NDA (II) 2017
Electromagnetic Wave
155703
The electromagnetic wave used in LASIK eye surgery is
1 Ultraviolet ray
2 X-ray
3 Microwave
4 Radio wave
Explanation:
A LASIK eye surgery removes the clear covering of the cornea to improve vision. The UV rays are used in this. UV rays have a shorter wavelength that can be focused on to very narrow beams for high precision work.
AMU-2017
Electromagnetic Wave
155705
Which one of the following waves is used for detecting forgery in currency notes?
1 Ultraviolet waves
2 Infrared waves
3 Radio waves
4 Microwaves
Explanation:
A Ultraviolet waves are used for detecting forgery in currency notes. The paper currency has a strip that is embedded in the note. This strip cannot be forged like that in the original currency. So, to detect forgery in currency notes, ultraviolet waves are used.