Chapter (2)- Atomic Structure (3)

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Q1. Nucleons are - *

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only neutrons

neutrons + protons

neutrons + protons + electrons

neutrons + electrons

Q2. Atoms with same mass number but different atomic numbersare called - *

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isotopes

isochores

isobars

None of these

Q3. The ideal body, which emits and absorbs radiations of allfrequencies, is called a black body and the radiation emittedby such a body is called - *

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white body radiation

black body emission

black body radiation

None of these

Q4. If the wavelength of the electromagnetic radiation is increased to thrice the digital value, then what will be the percent change in the value of frequency of the electromagnetic radiation. *

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Increases by 33%

Increases by 66%

Decreases by 33%

Decreases by 66%

Q5. Which one of the following is not the characteristic of Planck’s quantum theory of radiation ? *

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The energy is not absorbed or emitted in whole number or multiple of quantum

Radiation is associated with energy

Radiation energy is not emitted or absorbed continuously but in the form of small packets called quanta

This magnitude of energy associated with a quantum is proportional to the frequency.

Q6. Which of the following is related with both wave nature and particle nature ? *

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E = mc2

E = hv

Interference

Diffraction

Q7. The value of Planck's constant is 6.63 × 10^–34 Js. The velocity of light is 3.0 × 10^8 m s–1. Which value is closest tothe wavelength in nanometers of a quantum of light with frequency of 8 × 10^15 s? *

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3 × 10^7

5 × 10^-18

2 × 10^-25

3.75 × 10

Q8. In the photo-electron emission, the energy of the emitted electron is *

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greater than the incident photon

same as than of the incident photon

smaller than the incident photon

proportional to the intensity of incident photon

Q9. Which of the following statements do not form a part of Bohr ’s model of hydrogen atom ? *

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Energy of the electrons in the orbits are quantized

The electron(s) in the orbit nearest to the nucleus has the lowest energy

Electrons revolve in different orbits around the nucleus

The position and velocity of the electrons in the orbit cannot be determined simultaneously

Q10. An electron from one Bohr stationary orbit can go to next higher orbit - *

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by emission of electromagnetic radiation

by absorption of any electromagnetic radiation

by absorption of electromagnetic radiation of particular frequency

without emission or absorption of electromagnetic radiation

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