Chemistry Physics MCQs Past Papers CSS PMS NTS Entry Test
Physics
1.The de-Broglie wavelength, of an electron whose kinetic energy is 120 eV, is.
A. 1.1 nm
B. 1.1 Å
C. 1.1 pm
D. 1.1 μm
ANSWER: B
2.In Davsson- Germer experiment, if the angle of diffraction is 52°, then the glancing angle will be.
A. 32°
B. 64°
C. 72°
D. 92°
ANSWER: B
3.An electron has a de-Broglie wavelength of 0.0013 nm. Its kinetic energy will be.
A. 0.44 MeV
B. 0.57 MeV
C. 0.89 MeV
D. 0.95 MeV
ANSWER: C
4.Which quantity is said to be degenerate when.
A. Eigen vectors
B. Eigen functions
C. Eigen values
D. Operators
ANSWER: B
5.An electron is trapped in an infinite well of width 1.0 cm. For what value of ‘n’ will the electron have energy of 2 eV.
A. ~ 105
B. ~ 109
C. ~ 108
D. ~ 107
ANSWER: D
6.The Davsson- Germer experiment is famously known for.
A. The discovery of the electron
B. Demonstrating the wave nature of electron
C. Observing light diffraction
D. Discovering the photo-electric effect
ANSWER: B
7.The uncertainty principle applies to.
A. Macroscopic particles
B. Microscopic particles
C. Gases
D. Both A & B
ANSWER: B
8.Uncertainty principle can be understood with the help of.
A. Dalton’s effect
B. Compton’s effect
C. Electron effect
D. Rhombic effect
ANSWER: B
9.The uncertainty in position and velocity of a particle are 10-10 m and 5.27 x 10-24 ms-1 respectively. The mass of the particle is.
A. 0.92 Kg
B. 0.99 g
C. 0.099Kg
D. 0.92 g
ANSWER: C
10.Any wave function can be written as a linear combination of.
A. Eigen vectors
B. Eigen values
C. Eigen functions
D. Operators
ANSWER: C