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Physics Atomic Structure Test Online MCQs

Test Name	Atomic Structure MCQsTest
Subject	Physics
Test Type	MCQs
Total Question	20
Total Marks	40
Total Time	20 Mints
Test Help For	Physics Subject Test Prep. All Admissions Test. All Jobs Test prep. Medical Test prep. Engineering Test prep.

Nuclear physics is containing so interesting information. Attempt all the multiple choice questions of the topic Atomic Structure to increase your intellectual level. Atomic Structure MCQs Test Online is given below.

Physics Atomic Structure Test Online MCQs

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Physics

1. Why does the photoelectric effect reveal the particle nature of radiations?

Radiations eject electrons

Energy of the emitted electrons depends on the intensity of radiations

Radiations are absorbed by the electrons

Energy of the emitted electrons depends on the frequency of radiations

Question 1 of 20

2. The mass of electron is M, its charge is e and it is accelerated from rest through a potential V. The velocity required by the electron will be:

None of the above

MeV

Question 2 of 20

3. Which of the following cannot be found at rest

Neutron

Proton

Electron

Photon

Question 3 of 20

4. Which of the following is not the property of the laser beam?

Consists of electrons

Can be focused to a tiny point

Very narrow angular speed

Coherence

Question 4 of 20

5. Which of the following is not property of photons?

Energy

Rest mass

Frequency

Momentum

Question 5 of 20

6. The e/m is not constant for:

α-rays

Cathode rays

Positive rays

β-rays

Question 6 of 20

7. Which of the following achieves conversion of electromagnetic wave energy into electrical energy?

Cathode ray tube

Coolidge tube

Photocell

Thermo couple

Question 7 of 20

8. Blue light can cause photoelectric emission from a metal, but yellow light cannot. If red light is incident on the metal, then:

Energy of the photoelectrons will increase

No photoelectric emission will occur

Rate of emission of photoelectrons will decrease

Photoelectric current will increase

Question 8 of 20

9. The mass of electron is M, its charge is e and it is accelerated from rest through a potential V. The energy acquired by the particle I electron volt will be:

MeV

Question 9 of 20

10. Given that the mass of neutron or proton is approximately 1840 times the mass of electron. What is the ratio of specific charge of electron to α-particles?

3680

1/1840

1/3680

1840

Question 10 of 20

11. The magnitude of saturation photoelectric currents depends upon:

Work function

Stopping potential

Frequency of radiations

Intensity of radiations

Question 11 of 20

12. What determines the work function of a metal?

Energy required to eject the electron from the orbit

None of the above

Energy required to ionize the atom

Frequency of the incident light

Question 12 of 20

13. If an electron has an initial velocity perpendicular to directions of electric field, the path of the electron is:

An ellipse

A straight line

A parabola

A circle

Question 13 of 20

14. What is the order of pressure of the gas in cathode ray tube?

1 atmosphere

1 mm of Hg

1 nm of Hg

1 µ m of mg

Question 14 of 20

15. The study of photoelectric effect is useful in understanding:

Conservation of charge

Quantization of energy

Conservation of kinetic energy

Quantization of charge

Question 15 of 20

16. An electron and proton are fired through uniform magnetic fields perpendicular to it with the same kinetic energy. What is the nature of trajectory?

Electrons trajectory is more curved than the proton trajectory

Both particles move along straight line path

Electrons trajectory is less curved than the proton trajectory

Both trajectories are equally curved

Question 16 of 20

17. The photoelectric effect is a phenomenon which can be used to convert:

Light energy into Electric energy

Electric energy into Mechanical energy

Photon into electron

Light energy into Mechanical energy

Question 17 of 20

18. Cathode rays enter a magnetic field making oblique angle with the lines of magnetic induction. What will be the nature of the path followed?

Parabola

Straight line

Circle

Helix

Question 18 of 20

19. Which electrons are emitted in the photo electric effect?

Electrons freely roaming about in the inter-atomic space

Electrons in the outer most orbit of the atom

Electrons from within the nucleus

Electrons in the inner orbits of the atom

Question 19 of 20

20. The photo electric effect supports a theory of light proposed by:

Huygen

Einstein

Newton

None of the above

Question 20 of 20

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2018-04-09

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