PPSC Lecturer of Physics Online Test 37 Past Papers

Leave a Comment / By Hassan / October 19, 2020

Online Free Taleem is free online MCQ’s test related to Lecturer Physics. All the individuals who are going to appear in Lecturer Physics written test can attempt these tests in order to prepare for it in best possible way. Our tests of Lecturer of Physics include all the important questions and Past Paper of Lecturer Physics, that have extremely high amount of chances for been included in the actual exam which make our test undoubtedly the best source of preparation.

Note:-

There will be 25 multiple choice question in the test.
Answer of the questions will change randomly each time you start this test.
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Test Instructions:-
Test Name	Lecturer Physics
Subject	Physics Test 37
Test Type	MCQs
Total Questions	25
Total Time	20 Minutes
Total Marks	100

You have 20 minutes to pass to the quiz.

PPSC Lecturer of Physics Test 37

1 / 25

In a photoelectric effect experiment at a frequency above cut off, the number of electrons ejected is proportional to:

their kinetic energy

their potential energy

the number of photons that hit the sample

the work function

the frequency of the incident light

2 / 25

Evidence for the wave nature of matter is:

Lenz’s law

Thompson’s measurement of e/m

Young’s double slit experiment

electron diffraction experiments of Davisson and Germer

the Compton effect

3 / 25

The radial probability density for the electron in the ground state of a hydrogen atom has a peak at about:

50pm

500pm

5 pm

5000pm

0.5pm

4 / 25

In Compton scattering from stationary particles the maximum change in wavelength can be made smaller by using:

lower frequency radiation

more massive particles

particles with greater charge

less massive particles

higher frequency radiation

5 / 25

Light beams A and B have the same intensity but the wavelength associated with beam A is longer than that associated with beam B. The photon flux (number crossing a unit area per unit time) is:

greater for B than for A only if both have short wavelengths

greater for A than for B

the same for A and B

greater for A than for B only if both have short wavelengths

greater for B than for A

6 / 25

In a photoelectric effect experiment the stopping potential is:

the energy required to remove an electron from the sample

the potential energy of the most energetic electron ejected

the photon energy

the electric potential that causes the electron current to vanish

the kinetic energy of the most energetic electron ejected

7 / 25

Electromagnetic radiation with a wavelength of 5.7×10⁻¹² m is incident on stationary electrons. Radiation that has a wavelength of 6.57 × 10⁻¹² m is detected at a scattering angle of:

10◦

121◦

69◦

40◦

50◦

8 / 25

The quantization of energy, E = nhf, is not important for an ordinary pendulum because:

the allowed energy levels are too widely spaced

the formula applies only to atoms

the value of h for a pendulum is too large

the allowed energy levels are too closely spaced

the formula applies only to mass-spring oscillators

9 / 25

In Compton scattering from stationary electrons the frequency of the emitted light is independent of:

the frequency of the incident light

none of the above

the speed of the electron

the electron recoil energy

the scattering angle

10 / 25

In a photoelectric effect experiment no electrons are ejected if the frequency of the incident light is less than A/h, where h is the Planck constant and A is:

the minimum energy needed to eject the most energetic electron

the maximum energy needed to eject the most energetic electron

the maximum energy needed to eject the least energetic electron

the intensity of the incident light

the minimum energy needed to eject the least energetic electron

11 / 25

The frequency of light beam A is twice that of light beam B. The ratio EA/EB of photon energies is:

1/4

1/2

12 / 25

Which of the following electromagnetic radiations has photons with the greatest energy?

x rays

radio waves

yellow light

blue light

microwaves

13 / 25

Rank following electromagnetic radiations according to the energies of their photons, from least to greatest:
1. blue light
2. yellow light
3. x rays
4. radio waves

1, 2, 3, 4

3, 2, 1, 4

4, 1, 2, 3

3, 1, 2, 4

4, 2, 1, 3

14 / 25

In a photoelectric effect experiment at a frequency above cut off, the stopping potential is proportional to:

the energy of the most energetic electron after it is ejected

the energy of the least energetic electron after it is ejected

the electron potential energy at the surface of the sample

the energy of the least energetic electron before it is ejected

the energy of the most energetic electron before it is ejected

15 / 25

Separate Compton effect experiments are carried out using visible light and x rays. The scattered radiation is observed at the same scattering angle. For these experiments:

the two radiations have the same shift in wavelength and the visible light has the greater change in photon energy

the two radiations have the same shift in wavelength and the x rays have the greater change in photon energy

the two radiations have the same shift in wavelength and the same change in photon energy

the visible light has the greater shift in wavelength and the greater shift in photon energy

the x rays have the greater shift in wavelength and the greater change in photon energy

16 / 25

Of the following which is the best evidence for the wave nature of matter?

The Compton effect

The reflection of electrons by crystals

The relationship between momentum and energy for an electron

The photoelectric effect

The spectral radiancy of cavity radiation

17 / 25

A photon in light beam A has twice the energy of a photon in light beam B. The ratio pA/pB of their momenta is:

1/4

1/2

18 / 25

Of the following, Compton scattering from electrons is most easily observed for:

infrared light

visible light

x rays

ultraviolet light

microwaves

19 / 25

The units of the Planck constant h are those of:

energy

momentum

power

angular momentum

frequency

20 / 25

The stopping potential for electrons ejected by 6.8×10¹⁴-Hz electromagnetic radiation incident on a certain sample is 1.8V. The kinetic energy of the most energetic electrons ejected and the work function of the sample, respectively, are:

1.8 eV, 2.8 eV

1.0 eV, 4.6 eV

2.8 eV, 1.0 eV

1.8 eV, 1.0 eV

1.8 eV, 4.6 eV

21 / 25

If h is the Planck constant, then ¯h is:

2h/π

2πh

h/2

h/2π

22 / 25

Which of the following electromagnetic radiations has photons with the greatest momentum?

microwaves

radio waves

blue light

yellow light

x rays

23 / 25

Which of the following is NOT evidence for the wave nature of matter?

Electron tunneling

The validity of the Heisenberg uncertainty principle

The interference pattern obtained when electrons pass through a two-slit system

The diffraction pattern obtained when electrons pass through a slit

The photoelectric effect

24 / 25

In Compton scattering from stationary electrons the largest change in wavelength occurs when the photon is scattered through:

0◦

22.5◦

180◦

90◦

45◦

25 / 25

The wavelength of light beam B is twice the wavelength of light beam B. The energy of a photon in beam A is:

four times the energy of a photon in beam B

equal to the energy of a photon in beam B

twice the energy of a photon in beam B

half the energy of a photon in beam B

one-fourth the energy of a photon in beam B

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PPSC Lecturer of Physics Online Test 37 Past Papers

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