Test: Atoms (CBSE Level With Solutions)


30 Questions MCQ Test Physics Class 12 | Test: Atoms (CBSE Level With Solutions)


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This mock test of Test: Atoms (CBSE Level With Solutions) for Class 12 helps you for every Class 12 entrance exam. This contains 30 Multiple Choice Questions for Class 12 Test: Atoms (CBSE Level With Solutions) (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Atoms (CBSE Level With Solutions) quiz give you a good mix of easy questions and tough questions. Class 12 students definitely take this Test: Atoms (CBSE Level With Solutions) exercise for a better result in the exam. You can find other Test: Atoms (CBSE Level With Solutions) extra questions, long questions & short questions for Class 12 on EduRev as well by searching above.
QUESTION: 1

According to ‘plum pudding model’ atoms on the whole are electrically neutral because

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QUESTION: 2

Emission line spectra of different elements

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QUESTION: 3

What is the shortest wavelength present in the Paschen series of spectral lines?

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QUESTION: 4

Average angle of deflection of α-particles by a thin gold foil predicted by Thomson’s model is

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QUESTION: 5

The average lifetime of the first excited level of a hydrogen atom is 1.0 ×10−8 s. In the Bohr model, how many orbits does an electron in the n = 2 level complete before returning to the ground level?

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QUESTION: 6

Each element is associated with

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QUESTION: 7

Which of these statements about Bohr model is correct?

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QUESTION: 8

Which of these statements about Bohr model hypothesis is correct?

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QUESTION: 9

Which of these statements about Bohr model applied to hydrogen atom correct?

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QUESTION: 10

Probability of backward scattering (i.e., scattering of α -particles at angles greater than 90∘) predicted by Thomson’s model is

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QUESTION: 11

In Geiger-Marsden experiment very small deflection of the beam was expected because

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QUESTION: 12

Fluorescence is

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QUESTION: 13

Suppose you are given a chance to repeat the alpha-particle scattering experiment using a thin sheet of solid hydrogen in place of the gold foil. (Hydrogen is a solid at temperatures below 14 K.) What results do you expect?

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QUESTION: 14

It is found experimentally that for small thickness t, the number of α-particles scattered at moderate angles is proportional to t. What clue does this linear dependence on t provide?

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QUESTION: 15

An electron collides with a hydrogen atom in its ground state and excites it to a state of n = 3. How much energy was given to the hydrogen atom in this inelastic collision?

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QUESTION: 16

Which of these statements correctly describe the atomic model according to classical electromagnetic theory ?

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QUESTION: 17

Reason why there are many lines in an atomic spectrum is because

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QUESTION: 18

In the ground state of which model electrons are in stable equilibrium with zero net force?

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QUESTION: 19

A triply ionized beryllium ion Be3+, (a beryllium atom with three electrons removed), behaves very much like a hydrogen atom except that the nuclear charge is four times as great. For the hydrogen atom, the wavelength of the photon emitted in the n =2 to n=1 to transition is 122 nm. What is the wavelength of the photon emitted when a Be3+ ion undergoes this transition?

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QUESTION: 20

In Geiger-Marsden experiment, at the point of closest approach

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QUESTION: 21

Fluorescent lamps are more efficient than incandescent lamps in converting electrical energy to visible light because

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QUESTION: 22

In which of the models An atom has a nearly continuous mass distribution?

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QUESTION: 23

Find the longest wavelength present in the Balmer series of hydrogen, corresponding to the H- line.

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QUESTION: 24

According to Bohr model radiation takes place when

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QUESTION: 25

The model that best explains the results of Geiger-Marsden experiment is

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QUESTION: 26

To produce an emission spectrum of hydrogen

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QUESTION: 27

According to Bohr model allowed values of angular momentum are

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QUESTION: 28

Which of these statements about Bohr model hypothesis is correct?

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QUESTION: 29

In a Geiger -Marsden experiment, what is the distance of closest approach d to the nucleus of a 7.7 MeV α−particle before it comes momentarily to rest and reverses its direction?

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QUESTION: 30

Absorption line spectrum is obtained

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