Agniveer Army Technical Modern Physics Questions — Top 20 Practice MCQs with Solutions | ZestExam
ZE
ZESTEXAM
Agniveer Army Technical Modern Physics Questions
Top 20 Practice MCQs — with Solutions & Shortcuts
This page covers the top 20 Agniveer Army Technical Modern Physics questions with full solutions, difficulty grading, and exam-specific shortcuts. All 4 subtopics are covered with graded practice MCQs.
The ionization energy of a hydrogen atom is the energy required to remove the electron from the first orbit. This value is:
Q4Easy
The radius of a nucleus is given by R = R₀A^(1/3), where R₀ ≈ 1.2 fm. If nucleus A has mass number 8 and nucleus B has mass number 27, what is the ratio of their radii R_A : R_B?
Q5Easy
A semiconductor has an intrinsic carrier concentration of ni = 1.5 × 10¹⁰ cm⁻³ at 300 K. If the semiconductor is doped with donor impurities to make it n-type with carrier concentration n = 1.5 × 10¹⁵ cm⁻³, what is the hole concentration p in this n-type semiconductor?
Q6Easy
A p-n junction diode is forward biased with an applied voltage of 0.6 V. If the thermal voltage kT/e at room temperature is 0.026 V, what is the approximate diode current relative to its reverse saturation current I₀ using the ideal diode equation I = I₀(e^(eV/kT) − 1)?
Q7Easy
The energy of an electron in the second orbit (n=2) of a hydrogen atom is -3.4 eV. What is the energy of the electron in the first orbit (n=1)?
Q8Easy
Which of the following statements about the ground state of a hydrogen atom is correct?
Q9Easy
The binding energy per nucleon is maximum for nuclei with mass number around:
Q10Easy
A nucleus undergoes beta-minus decay. What happens to the atomic number (Z) and mass number (A)?
Q11Easy
An electron accelerated through a potential difference of 50 V has a de Broglie wavelength of 1.73 × 10⁻¹⁰ m. Which statement correctly describes the dual nature illustrated here?
Q12Easy
In nuclear fission, a heavy nucleus splits into two lighter nuclei. Which statement is correct?
Q13Easy
The de Broglie wavelength of a moving particle is given by λ = h/p. If an electron (mass = 9.1 × 10⁻³¹ kg) moves with velocity 2 × 10⁶ m/s, calculate its de Broglie wavelength. (h = 6.63 × 10⁻³⁴ J·s)
Q14Easy
Which of the following statements correctly describes the energy band structure of a semiconductor at 0 K?
Q15Easy
In the photoelectric effect, Einstein's photon theory explains that light consists of discrete energy packets. Which phenomenon directly proves the particle nature of radiation?
Q16Easy
According to Bohr's model of the hydrogen atom, the radius of the first orbit (Bohr radius) is approximately:
Q17Easy
A light wave of wavelength 500 nm is diffracted through a slit, and simultaneously, individual photons from this light eject electrons from a photoelectric surface. Which aspect of dual nature is demonstrated respectively?
Q18Easy
An electron transitions from the third orbit (n=3) to the second orbit (n=2) in a hydrogen atom. The energy of the emitted photon is:
Q19Easy
A photon of frequency 6 × 10¹⁵ Hz is incident on a metal surface. If the Planck's constant h = 6.63 × 10⁻³⁴ J·s, calculate the energy of the photon.
Q20Easy
A silicon semiconductor is doped with acceptor impurities to create a p-type semiconductor. Which of the following is the primary charge carrier in this p-type material?
🔓
52+ more Modern Physics questions in the Practice Panel
Full question bank with difficulty filter, bookmark, and timed practice mode. Free to start — no credit card.