Q. No.Choose the correct option:
| 1. | The radiation in increasing order of frequency are radio waves, microwaves, infrared, visible, ultraviolet, X-rays, gamma rays. |
| 2. | The wavelength of colours in increasing order is violet, indigo, green, yellow, orange and red. |
| 3. | The speed of light is maximum in vacuum. |
| 4. | All options are correct. |
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Which statement is correct for X-rays and gamma rays?
| 1. | X-rays are emitted from electronic transitions while gamma rays are emitted from nuclear transitions. |
| 2. | X-rays have less penetrating power in comparison to gamma rays, in general. |
| 3. | The frequency of gamma rays is more than the frequency of X-rays, in general. |
| 4. | All of the above. |
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If \(\lambda_{v}, \lambda_{x},\) and \(\lambda_{m}\) represent the wavelengths of visible light, \(x\text-\)rays and microwaves respectively, then:
1. \( \lambda_{m}>\lambda_{x}>\lambda_{v} \)
2. \( \lambda_{v}>\lambda_{m}>\lambda_{x } \)
3. \( \lambda_{v}>\lambda_{x}>\lambda_{m }\)
4. \(\lambda_{m}>\lambda_{v}>\lambda_{x}\)
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The most penetrating radiation out of the following is:
1. \(X\text-\)rays
2. \(\beta\text-\)rays
3. \(\alpha\text-\)rays
4. \(\gamma\text-\)rays
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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. | the frequency of the microwave has no relation to the natural frequency of water molecules. |
| 3. | microwave are heatwaves, so always produce heating. |
| 4. | infrared waves produce heating in a microwave oven. |
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Which of the following is not an electromagnetic wave?
1. Radio wave
2. Micro wave
3. Cosmic rays
4. -rays
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| 1. | \( b>a>c \) | 2. | \( a>b>c \) |
| 3. | \( c>b>a \) | 4. | \( a>c>b\) |
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The decreasing order of the wavelength of infrared, microwave, ultraviolet and gamma rays is:
| 1. | Gamma rays, ultraviolet, infrared, microwaves |
| 2. | Microwaves, gamma rays, infrared, ultraviolet |
| 3. | Infrared, microwave, ultraviolet, gamma rays |
| 4. | Microwave, infrared, ultraviolet, gamma rays |
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| 1. | Ultraviolet light has a wavelength shorter than \(4000~\mathring{A}\). |
| 2. | Infrared light has a wavelength longer than \(7000~\mathring{A}\). |
| 3. | Red light has a wavelength near about \(7000~\mathring{A}\). |
| 4. | Violet light has a wavelength near about \(7000~\mathring{A}\). |
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