NEET Test Series from KOTA - 10 Papers In MS WORD
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PHXII08:ELECTROMAGNETIC WAVES
368897
Assertion : Micro waves are used in radar. Reason : These waves have very small wavelength.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Radar needs singnal in particular direction and so short wavelength is required. Microwaves, with their short wavelengths in the millimeter range, are ideal for radar systems, enabling the generation of precise and directional beams crucial for accurate target detection in military, meteorological, and air traffic control applications. So correct option is (1).
PHXII08:ELECTROMAGNETIC WAVES
368898
The condition under which a microwave oven heats up a food item containing water molecules most efficiently is
1 The frequency of the microwave must match the resonant frequency of the water molecules
2 Infra-red waves produce heating in a microwave oven
3 The frequency of the microwave has no relation with natural frequency of water molecules
4 Microwave are heat waves, so always produce heating
Explanation:
It is an electromagnetic wave. The frequency of the microwave oven must match the resonant frequency of the water molecules.
PHXII08:ELECTROMAGNETIC WAVES
368899
Assertion : Short wave bands are used for transmission of "D waves" to a large distance. Reason : Short waves are reflected by ionosphere.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Short waves, with wavelengths from \(30\;km\) to \(30\;cm\), are vital for long-distance radio transmission, utilizing the ionosphere's ( 80 to 400 \(km\)) reflection to enable global connectivity. D wave band has range \(110\,\,170{\mkern 1mu} GHz\). So correct option is (1).
PHXII08:ELECTROMAGNETIC WAVES
368900
Assertion : Ultraviolet radiations are of higher frequency waves are dangerous to human being. Reason : Ultraviolet radiation are absorbed by the atmosphere.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Ultraviolet \((U V)\) waves, with wavelengths from \(4000\,\mathop {{\rm{ }}A}\limits^{\;\;^\circ } \) to \(100\,\mathop {{\rm{ }}A}\limits^{\;\;^\circ } \), are absorbed by the Earth's atmosphere, (converting \({O_2}\) to \({O_3}\)) contributing to the ozone layer formation and protecting against harmful \(U V\) radiation. While shorter \(UVC\)wavelengths are absorbed, \(UVB\) and \(UVA\) reaching the Earth's surface pose healthrisks, emphasizing the need for protective measures like sunscreen and sunglasses. So correct option is (2).
368897
Assertion : Micro waves are used in radar. Reason : These waves have very small wavelength.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Radar needs singnal in particular direction and so short wavelength is required. Microwaves, with their short wavelengths in the millimeter range, are ideal for radar systems, enabling the generation of precise and directional beams crucial for accurate target detection in military, meteorological, and air traffic control applications. So correct option is (1).
PHXII08:ELECTROMAGNETIC WAVES
368898
The condition under which a microwave oven heats up a food item containing water molecules most efficiently is
1 The frequency of the microwave must match the resonant frequency of the water molecules
2 Infra-red waves produce heating in a microwave oven
3 The frequency of the microwave has no relation with natural frequency of water molecules
4 Microwave are heat waves, so always produce heating
Explanation:
It is an electromagnetic wave. The frequency of the microwave oven must match the resonant frequency of the water molecules.
PHXII08:ELECTROMAGNETIC WAVES
368899
Assertion : Short wave bands are used for transmission of "D waves" to a large distance. Reason : Short waves are reflected by ionosphere.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Short waves, with wavelengths from \(30\;km\) to \(30\;cm\), are vital for long-distance radio transmission, utilizing the ionosphere's ( 80 to 400 \(km\)) reflection to enable global connectivity. D wave band has range \(110\,\,170{\mkern 1mu} GHz\). So correct option is (1).
PHXII08:ELECTROMAGNETIC WAVES
368900
Assertion : Ultraviolet radiations are of higher frequency waves are dangerous to human being. Reason : Ultraviolet radiation are absorbed by the atmosphere.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Ultraviolet \((U V)\) waves, with wavelengths from \(4000\,\mathop {{\rm{ }}A}\limits^{\;\;^\circ } \) to \(100\,\mathop {{\rm{ }}A}\limits^{\;\;^\circ } \), are absorbed by the Earth's atmosphere, (converting \({O_2}\) to \({O_3}\)) contributing to the ozone layer formation and protecting against harmful \(U V\) radiation. While shorter \(UVC\)wavelengths are absorbed, \(UVB\) and \(UVA\) reaching the Earth's surface pose healthrisks, emphasizing the need for protective measures like sunscreen and sunglasses. So correct option is (2).
368897
Assertion : Micro waves are used in radar. Reason : These waves have very small wavelength.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Radar needs singnal in particular direction and so short wavelength is required. Microwaves, with their short wavelengths in the millimeter range, are ideal for radar systems, enabling the generation of precise and directional beams crucial for accurate target detection in military, meteorological, and air traffic control applications. So correct option is (1).
PHXII08:ELECTROMAGNETIC WAVES
368898
The condition under which a microwave oven heats up a food item containing water molecules most efficiently is
1 The frequency of the microwave must match the resonant frequency of the water molecules
2 Infra-red waves produce heating in a microwave oven
3 The frequency of the microwave has no relation with natural frequency of water molecules
4 Microwave are heat waves, so always produce heating
Explanation:
It is an electromagnetic wave. The frequency of the microwave oven must match the resonant frequency of the water molecules.
PHXII08:ELECTROMAGNETIC WAVES
368899
Assertion : Short wave bands are used for transmission of "D waves" to a large distance. Reason : Short waves are reflected by ionosphere.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Short waves, with wavelengths from \(30\;km\) to \(30\;cm\), are vital for long-distance radio transmission, utilizing the ionosphere's ( 80 to 400 \(km\)) reflection to enable global connectivity. D wave band has range \(110\,\,170{\mkern 1mu} GHz\). So correct option is (1).
PHXII08:ELECTROMAGNETIC WAVES
368900
Assertion : Ultraviolet radiations are of higher frequency waves are dangerous to human being. Reason : Ultraviolet radiation are absorbed by the atmosphere.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Ultraviolet \((U V)\) waves, with wavelengths from \(4000\,\mathop {{\rm{ }}A}\limits^{\;\;^\circ } \) to \(100\,\mathop {{\rm{ }}A}\limits^{\;\;^\circ } \), are absorbed by the Earth's atmosphere, (converting \({O_2}\) to \({O_3}\)) contributing to the ozone layer formation and protecting against harmful \(U V\) radiation. While shorter \(UVC\)wavelengths are absorbed, \(UVB\) and \(UVA\) reaching the Earth's surface pose healthrisks, emphasizing the need for protective measures like sunscreen and sunglasses. So correct option is (2).
368897
Assertion : Micro waves are used in radar. Reason : These waves have very small wavelength.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Radar needs singnal in particular direction and so short wavelength is required. Microwaves, with their short wavelengths in the millimeter range, are ideal for radar systems, enabling the generation of precise and directional beams crucial for accurate target detection in military, meteorological, and air traffic control applications. So correct option is (1).
PHXII08:ELECTROMAGNETIC WAVES
368898
The condition under which a microwave oven heats up a food item containing water molecules most efficiently is
1 The frequency of the microwave must match the resonant frequency of the water molecules
2 Infra-red waves produce heating in a microwave oven
3 The frequency of the microwave has no relation with natural frequency of water molecules
4 Microwave are heat waves, so always produce heating
Explanation:
It is an electromagnetic wave. The frequency of the microwave oven must match the resonant frequency of the water molecules.
PHXII08:ELECTROMAGNETIC WAVES
368899
Assertion : Short wave bands are used for transmission of "D waves" to a large distance. Reason : Short waves are reflected by ionosphere.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Short waves, with wavelengths from \(30\;km\) to \(30\;cm\), are vital for long-distance radio transmission, utilizing the ionosphere's ( 80 to 400 \(km\)) reflection to enable global connectivity. D wave band has range \(110\,\,170{\mkern 1mu} GHz\). So correct option is (1).
PHXII08:ELECTROMAGNETIC WAVES
368900
Assertion : Ultraviolet radiations are of higher frequency waves are dangerous to human being. Reason : Ultraviolet radiation are absorbed by the atmosphere.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Ultraviolet \((U V)\) waves, with wavelengths from \(4000\,\mathop {{\rm{ }}A}\limits^{\;\;^\circ } \) to \(100\,\mathop {{\rm{ }}A}\limits^{\;\;^\circ } \), are absorbed by the Earth's atmosphere, (converting \({O_2}\) to \({O_3}\)) contributing to the ozone layer formation and protecting against harmful \(U V\) radiation. While shorter \(UVC\)wavelengths are absorbed, \(UVB\) and \(UVA\) reaching the Earth's surface pose healthrisks, emphasizing the need for protective measures like sunscreen and sunglasses. So correct option is (2).
