व्याख्याता भौतिकी 2019 प्रश्न पत्र उत्तर सहित MCQ

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प्रश्न 1: The magnetic moment (μ) of a revolving electron around the nucleus varies with principal quantum number (n) as:

• (A) μ ∝ n
• (B) μ ∝ 1/n
• (C) μ ∝ n²
• (D) μ ∝ 1/n²

उत्तर: (A) μ ∝ n

प्रश्न 2: The bit rate of a signal, which has a sampling rate of 8 kHz and where 16 quantization levels are used is:

• (A) 3200 bits/sec.
• (B) 16000 bits/sec.
• (C) 64000 bits/sec.
• (D) 72000 bits/sec.

उत्तर: (C) 64000 bits/sec.

प्रश्न 3: A neutron with velocity V strikes a stationary deuterium atom, its kinetic energy changes by a factor of:

• (A) 15/16
• (B) 1/2
• (C) 2/1
• (D) None of the above

उत्तर: (A) 15/16

प्रश्न 4: The binding energy per nucleon in Li⁷ and He⁴ nuclei are respectively 5.6 MeV and 7.06 MeV, then energy of the reaction ₃Li⁷ + p → 2 ₂He⁴ is:

• (A) 19.6 MeV
• (B) 2.4 MeV
• (C) 8.4 MeV
• (D) 17.3 MeV

उत्तर: (D) 17.3 MeV

प्रश्न 5: The diagram of a logic circuit is given below. The output F of the circuit is given by (परिपथ में W, X, Y इनपुट और F आउटपुट है):

• (A) W.(X+Y)
• (B) W.(X.Y)
• (C) W+(X.Y)
• (D) W+(X+Y)

उत्तर: (A) W.(X+Y)

प्रश्न 6: In the option given below, let E denote the rest mass energy of a nucleus and n denotes a neutron. The correct option is:

• (A) E(₉₂U²³⁶) > E(₅₃I¹³⁷) + E(₃₉Y⁹⁷) + 2E(n)
• (B) E(₉₂U²³⁶) < E(₅₃I¹³⁷) + E(₃₉Y⁹⁷) + 2E(n)
• (C) E(₉₂U²³⁶) < E(₅₆Ba¹⁴⁰) + E(₃₆Kr⁹⁴) + 2E(n)
• (D) None of the above

उत्तर: (C) E(₉₂U²³⁶) < E(₅₆Ba¹⁴⁰) + E(₃₆Kr⁹⁴) + 2E(n)

प्रश्न 7: The net charge in a P type semiconductor is:

• (A) Positive
• (B) Negative
• (C) Zero
• (D) None of the above

उत्तर: (C) Zero

प्रश्न 8: The energy of n^th orbit of hydrogen atom is E_n = -13.6 / n² eV. The energy required to send an electron from first orbit to the second orbit will be:

• (A) 10.2 eV
• (B) 12.1 eV
• (C) 13.6 eV
• (D) 3.4 eV

उत्तर: (A) 10.2 eV

प्रश्न 9: A diode AM detector with output circuit consisting of R = 1 kΩ and C = 1 μF would be suitable for detecting a carrier signal of:

• (A) 0.1 kHz
• (B) 0.5 kHz
• (C) 1 kHz
• (D) 10 kHz

उत्तर: (D) 10 kHz

प्रश्न 10: In Rutherford scattering experiment, what will be the correct angle for α-scattering for an impact parameter b = 0:

• (A) 90°
• (B) 270°
• (C) 0°
• (D) 180°

उत्तर: (D) 180°

प्रश्न 11: In the following common emitter configuration an NPN transistor with current gain β = 100 is used. The output voltage of the amplifier will be:

• (A) 10 mV
• (B) 0.1 V
• (C) 1.0 V
• (D) 10 V

उत्तर: (C) 1.0 V

प्रश्न 12: The typical ionisation energy of a donor in silicon is:

• (A) 10.0 eV
• (B) 1.0 eV
• (C) 0.1 eV
• (D) 0.001 eV

उत्तर: (D) 0.001 eV

प्रश्न 13: The radio waves of frequency 300 MHz to 3000 MHz belong to:

• (A) HF
• (B) VHF
• (C) UHF
• (D) SHF

उत्तर: (C) UHF

प्रश्न 14: The wave number of Balmer line in terms of Rydberg constant R is:

• (A) R
• (B) 3R
• (C) 5R / 36
• (D) 8R / 9

उत्तर: (C) 5R / 36

प्रश्न 15: Ge and Si diodes conduct at 0.3 V and 0.7 V respectively. In the following figure if Ge diode connection is reversed, the value of V₀ changes by:

• (A) 0.2 V
• (B) 0.4 V
• (C) 0.6 V
• (D) 0.8 V

उत्तर: (A) 0.2 V

प्रश्न 16: Ne²² nucleus after absorbing energy decays into two α-particles and an unknown nucleus. The unknown nucleus is:

• (A) Nitrogen
• (B) Carbon
• (C) Boron
• (D) Oxygen

उत्तर: (B) Carbon

प्रश्न 17: The maximum amplitude of an amplitude modulated wave is 25 V and the minimum amplitude is 5 V then the modulation index is:

• (A) 2/3
• (B) 1/2
• (C) 3/4
• (D) 1/3

उत्तर: (A) 2/3

प्रश्न 18: The given figure shows the wave form of two inputs A and B and that for the output Y of a logic circuit. The logic circuit is:

• (A) AND Gate
• (B) OR Gate
• (C) NAND Gate
• (D) NOT Gate

उत्तर: (C) NAND Gate

प्रश्न 19: In the following transitions which one has higher frequency?

• (A) 3 - 2
• (B) 4 - 3
• (C) 4 - 2
• (D) 3 - 1

उत्तर: (D) 3 - 1

प्रश्न 20: Hydrogen atom from excited state comes to the ground state by emitting a photon of wave length λ. If R is the Rydberg constant, the principal quantum number n of the excited state is:

• (A) √(λR / (λR - 1))
• (B) √(λ / (λR - 1))
• (C) √(λR² / (λR - 1))
• (D) √(λR / (λ - 1))

उत्तर: (A) √(λR / (λR - 1))

प्रश्न 21: The operating range of mobile telephone is:

• (A) 1-100 MHz
• (B) 100-200 MHz
• (C) 1000-2000 MHz
• (D) 800-950 MHz

उत्तर: (D) 800-950 MHz

प्रश्न 22: The voltage gain of the following amplifier is:

• (A) 10
• (B) 100
• (C) 1000
• (D) 9.9

उत्तर: (B) 100

प्रश्न 23: The most stable particle in Baryon group is:

• (A) Proton
• (B) Λ-Particle
• (C) Neutron
• (D) Ω-Particle

उत्तर: (A) Proton

प्रश्न 24: Which state of triple ionised Beryllium (Be⁺⁺⁺) has the same orbital radius as that of ground state of hydrogen?

• (A) n = 4
• (B) n = 3
• (C) n = 2
• (D) n = 1

उत्तर: (C) n = 2

प्रश्न 25: From a newly formed radioactive substance (Half-life 2 Hours), the intensity of radiation is 64 times the permissible safe level. The minimum time after which work can be done safely from this source is:

• (A) 6 Hours
• (B) 12 Hours
• (C) 24 Hours
• (D) 128 Hours

उत्तर: (B) 12 Hours