Dual Nature of Radiation NEET Questions

Physics - Dual Nature of Matter and Radiation

Dual Nature of Radiation MCQ Questions


1.
The minimum energy required by an electron to escape from the surface of a metal is called:
A.
Threshold energy of photon
B.
Ionization energy
C.
Kinetic energy
D.
Work function
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ANSWER :
D. Work function
2.
1 electron volt (1 eV) is equal to:
A.
6.626 × 10⁻³⁴ J
B.
9.1 × 10⁻³¹ J
C.
1.602 × 10⁻¹⁹ J
D.
1.602 × 10⁻¹⁷ J
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ANSWER :
C. 1.602 × 10⁻¹⁹ J
3.
Which of the following processes does NOT cause electron emission from a metal surface?
A.
Thermionic emission
B.
Photoelectric emission
C.
Field emission
D.
Cooling the metal to very low temperature
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ANSWER :
D. Cooling the metal to very low temperature
4.
The presently accepted value of specific charge (e/m) of electron is:
A.
1.6 × 10⁻¹⁹ C/kg
B.
9.1 × 10⁻³¹ C/kg
C.
1.76 × 10¹¹ C/kg
D.
6.63 × 10⁻³⁴ C/kg
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ANSWER :
C. 1.76 × 10¹¹ C/kg
5.
Millikan's oil-drop experiment established that:
A.
Electrons have wave nature
B.
Light consists of photons
C.
Mass of electron is variable
D.
Electric charge is quantised
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ANSWER :
D. Electric charge is quantised
6.
The photoelectric effect was first discovered by:
A.
Albert Einstein
B.
Max Planck
C.
J.J. Thomson
D.
Heinrich Hertz
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ANSWER :
D. Heinrich Hertz