People wear sunglasses to protect their eyes from:

1. U.V radiation
2. I.R radiations
3. gamma rays
4. x-rays
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Answer: A
Explanation:
• N/A
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Microwaves are used in:

1. cooking food
2. GPS system
3. Radar
4. All of these
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Answer: D
Explanation:
• N/A
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Microwaves are used in:

1. police traffic radar
2. Cordless home mobile phones
3. Microwave oven
4. All of these
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Answer: D
Explanation:
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Millitary radar make use of which radiation:

1. radio waves
2. I.R
3. radio or microwaves
4. gamma rays
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Answer: C
Explanation:
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A wave of high frequency has;

1. short wavelenth
2. long wavelength
3. low energy
4. short wavenumber
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Answer: A
Explanation:
• Since E = hv and v = c/λ where v (nu) is frequency
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Which relation is correct for the energy of photon:

1. E = hcλ
2. E = h/cλ
3. E = hc/λ
4. E = hv/cλ
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Answer: C
Explanation:
• Since E = hv and v = c/λ
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Reciprocal of wavelength is called;

1. frequency
2. wavenumber
3. velocity
4. none of these
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Answer: B
Explanation:
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The number of wavelengths per uint length is called;

1. frequency
2. wavenumber
3. velocity
4. wavelength
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Answer: B
Explanation:
• N/A
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The array of waves or particles which spread out in some increasing or decreasing order of wavelengths or frequencies is called:

1. scattering of light
2. diffraction
3. spectrum
4. none of these
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Answer: C
Explanation:
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The dispersion of the components of white light, when it is passed through a prism is called;

1. scattering of light
2. diffraction
3. spectrum
4. none of these
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Answer: C
Explanation:
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