MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Part-1 with Answers

Dual Nature of Radiation and Matter Part-1 Class 12 Physics MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Part-1 with Answers Pdf free download. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. We have Provided Dual Nature of Radiation and Matter Part-1 Class 12 Physics MCQs Questions with Answers to help students understand the concept very well.

Class 12 Physics Chapter 11 Quiz

Class 12 Physics Chapter 11 MCQ Online Test

You can refer to NCERT Solutions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Part-1 to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Dual Nature of Radiation and Matter Part-1 Class 12 Physics MCQ online test

Q1.	De-Broglie equation states the:
	A.dual nature
	B.particle nature
	C.wave nature
	D.none of these

Ans: dual nature

Q2.	Protons and alpha particles have the same de-Broglie wavelength. What is same for both of them ?
	A.Energy
	B.Time period
	C.Frequency
	D.Momentum

Ans: Momentum

Q3.	Kinetic energy of emitted electrons depends upon :
	A.frequency
	B.intensity
	C.nature of atmosphere surrounding the electrons
	D.none of these

Ans: frequency

Q4.	De-Broglie wavelength of a body of mass m and kinetic energy E is given by (symbols have their usual meanings):
	A.\(\frac{h}{\sqrt{2mE}}\)
	B.\(\frac{h}{2mE}\)
	C.\(\frac{\sqrt{2mE}}{h}\)
	D.\(\frac{h}{mE}\)

Ans: \(\frac{h}{\sqrt{2mE}}\)

Q5.	The ratio of specific charge of an alpha particle to the proton is:
	A.1 : 2
	B.2 : 1
	C.4 : 1
	D.1 : 4

Ans: 1 : 2

Q6.	In Thomson’s experiment number of parabola gives :
	A.the no. of electrons present in element
	B.the no. of proton present in element
	C.the no. of neutrons present in element
	D.the no. of isotopes of the element present

Ans: the no. of isotopes of the element present

Q7.	The work function of photoelectric material is 3.3 eV. The threshold frequency will be equal to:
	A.8 × 10¹⁴ Hz
	B.8 × 10¹⁰ Hz
	C.5 × 10¹⁰ Hz
	D.4 × 10¹⁴ Hz

Ans: 8 × 10¹⁴ Hz

Q8.	The strength of photoelectric current depends upon :
	A.angle of incident radiation
	B.frequency of incident radiation
	C.intensity of incident radiation
	D.distance between anode and cathode

Ans: frequency of incident radiation

Q9.	The momentum of an electron that emits a wavelength of 2 Å. will be:
	A.6.4 × 10^-36 kgms^-1
	B.3.3 × 10^-24 kgms^-1
	C.3.3 × 10^-34 kgms^-1
	D.none of these

Ans: 3.3 × 10^-24 kgms^-1

Q10.	Name the scientists who first studied the passage of electricity through fluids to establish the electrical nature of matter:
	A.Millikan
	B.Planck
	C.Faraday
	D.Boyle

Ans: Faraday

Q11.	Millikan’s oil drop experiment makes use of:
	A.Stokes’ law
	B.Boyle’s law
	C.Gas equation
	D.Bernoulli’s theorem

Ans: Stokes’ law

Q12.	X-rays are:
	A.deflected by an electric field
	B.deflected by a magnetic field
	C.deflected by both electric and magnetic fields
	D.not deflected by electric and magnetic fields

Ans: not deflected by electric and magnetic fields

Q13.	In photo electric emission, for alkali metals the threshold frequency lies in the:
	A.visible region
	B.ultraviolet region
	C.infrared region
	D.far end of the infrared region

Ans: visible region

Q14.	Which of the following radiations cannot eject photo electrons?
	A.ultraviolet
	B.infrared
	C.visible
	D.X-rays

Ans: infrared

Q15.	What is the de-Broglie wavelength of an electron accelerated from rest through a potential difference of V volts?
	A.\(\frac{12.3}{V^2}\) Å
	B.\(\frac{12.3}{V}\) Å
	C.\(\frac{12.2}{V^2}\) Å
	D.None of these

Ans: \(\frac{12.3}{V^2}\) Å

Q16.	What is the de-Broglie wavelength of an electron accelerated from rest through a potential difference of 100 volts?
	A.12.3 Å
	B.1.23 Å
	C.0.123 Å
	D.None of these

Ans: 1.23 Å

Q17.	What is the de-Broglie wavelength of a proton accelerated from rest through a potential difference of V volts?
	A.\(\frac{12.3}{√V}\) Å
	B.\(\frac{12.3}{V}\) Å
	C.\(\frac{12.2}{V^2}\) Å
	D.None of these

Ans: None of these

Q18.	When a yellow light is incident on a surface, no electrons are emitted while green light can emit electrons. If the red light is incident on the surface then:
	A.no electrons are emitted
	B.photons are emitted
	C.electrons of higher energy are emitted
	D.electrons of lower energy are emitted

Ans: no electrons are emitted

Q19.	The de-Broglie wavelength of particle of mass 1 mg moving with a velocity of 1 ms^-1, in terms of Planck’s constant h, is given by (in metre):
	A.10⁵ h
	B.10⁶ h
	C.10^-3 h
	D.10³ h