MCQ Questions Dual Nature of Radiation and Matter Physics Class 12 Chapter 11
NCERT Physics – Dual Nature of Radiation and Matter Class 12 Practice Questions for Jee Mains | NEET | School Exams.
Prepare these important Questions of Nature of Matter and Radiation, Latest questions to expect in Jee Mains | NEET | School Exams.
1. Cathode Rays were discovered by:
1. William Crookes
2. J.J Thompson
3. Roentgen
4. R.A Mulliken
2. Choose the correct one:
1. Work function is generally measured in joules.
2. Work function is not much sensitive to surface impurities.
3. Work function is maximum for Al among Na, Ca, Al.
4. Alkali metals responds only to UV light.
3. When charged zinc plate is illuminated by UV light, then leaves of electroscope will:
1. Repel only.
2. Collapse and then further repel.
3. Collapse and then attract.
4. Attract and repel continiously.
4. Who studied photo current variation with collector plate potential?
1. Albert Einstein.
2. Hallwachs and Lenard.
3. Henrich Hertz.
4. Davisson & Germer.
5. Quartz window permits which light spectrum to pass through:
1. Infrared only
2. Visible and infrared only
3. Microwaves and radiowaves only
4. UV rays
6. Photoelectric current is measured by:
1. Microammeter.
2. Galvanometer with high resistance in series.
3. Ammeter
4. Milliammeter
7. Estimate the speed with which electrons emitted from the heated emitter of an evacuated tube impinge on collector maintained at a potential difference of 20 MV. Ignore the small initial speed of electrons.
a. 2.65 x 10⁹ m/sec
b. 2.65 x 10⁸ m/sec
c. 2.99 x 10⁸ m/sec
d. 2.96 x 10⁷ m/sec
8. Why gases start conducting at low pressure?
1. They ionise rapidly due to decreased internal energy.
2. Ions have higher chance to reach electrode, as chance of recombination decreases.
3. Gas behavior becomes near to ideal gas behavior.
4. Gas expand at low pressure.
9. Compute the typical de-Broglie wavelength for electron in metal at 300K and compare it with mean seperation between two electrons which is about 2 Å. then
1. de-Broglie wavelength is about 6 nm and there is strong overlap of electron wave packets.
2. de-Broglie wavelength is about 6 Å and there is strong overlap of electron wave packets.
3. de-Broglie wavelength is about 6 μm and there is no overlap of electron wave packets.
4. de-Broglie wavelength is about 60 Å and there is no overlap of electron wave packets.
10. Observable charges in nature are
1. +2/3 e
2. Integral multiple of e
3. -1/3 e
4. All of these
11. Choose the correct statement with respect to wavelength, velocity and frequency associated with matter wave.
1. Both wavelength and group velocity are of physical significance.
2. Both phase velocity and group velocity are of physical significance.
3. Both phase velocity and particle velocity are of physical significance.
4. Both wavelength and phase velocity are of physical significance.
12. Which of the following is incorrect with respect to photoelectric effect?
a. 1)
b. 2)
c. 3)
d. 4)
13. Photoelectric current do not depends on:
1. Intensity of light
2. Potential difference applied between electrode
3. Stopping potential
4. Nature of emitter
14. Interference fringes are observed for:
1. Iodine molecules
2. Electrons
3. Neutrons
4. All of these
15. Which scientist obtained accurate value of Planck’s constant h?
1. Max Planck
2. Max Born
3. Mullikan
4. Thomson
16. Choose the correct statement.
1. A wave of definite wavelength is not extended all over space.
2. Matter wave is made of single wavelength
3. de-Broglie relation and Born’s probability interpretation reproduce the Heisenberg principle exactly.
4. de-Broglie hypothesis does not support Bohr’s concept of stationary orbit.
17. Matter waves are
1. Electromagnetic waves
2. Mechanical waves
3. Both 1 and 2
4. Neither 1 nor 2
18. Electric eye converts:
1. Change in frequency of illumination into change in photocurrent.
2. Change in intensity of illumination into change in photocurrent.
3. Change in frequency of illumination into change in intensity.
4. Change in photocurrent of illumination into change in frequency.
19. State true or false:
A. Absorption by rods and cones require wave picture of light.
B. Gathering of light by eye-lens require wave picture of light.
1. T T
2. F F
3. T F
4. F T
20. Which of the following cannot be explained by wave model.
1. Rectilinear propagation.
2. Low temperature specific heat of solids.
3. Diffraction.
4. Reflection.