B.Sc Chemistry Sem 4 Quiz 1

Which metal was used in the Rutherford's alpha scattering experiement

• Ag

• Au

• Zn

• Po

How many neutrons present in the alpha particle (⁴He₂)

• 4

• 2

• 0

• 1

Which one of the following spectral lines fall under near UV region

• Lyman Series

• Balmer series

• Paschen Series

• Pfund Series

Which of the following statements are correct?

• Heisenberg Uncertainty principle applies to only macroscopic particles

• It is impossible to determine the both time and mass of an electron with accuracy

• It is impossible to determine the both time and position of an electron with accuracy

• It is impossible to determine the both momentum and position of an electron with accuracy

The uncertainty in measuring velocity of a proton is 4x10³ m/s. The minimum uncertainty involved in measuring the position of proton will be?

• 7.9x10^-12 m

• 7.9x10^-9 m

• 3.9x10^-12 m

• 3.9x10^-9 m

Which of the following is a correct relation according to Heisenberg's Uncertainty principle?

• Δx X Δp ≤ h/4π

• Δx X Δv ≤ h/4π

• Δx X Δp ≥ h/4π

• Δx X Δv ≥ h/4π

The De Broglie wavelength of an electron having velocity 3x10⁷ m/s is

• 0.242 Å

• 0.121 Å

• 0.543 Å

• 0.484 Å

The De broglie wavelength of a electron and a unknown particle are equal. What will be the ratio of their velocities if unknown particle have mass 4 times to that of electron

• 1:4

• 4:1

• 1:1

• 1:2

The concept of stationary orbit was given by

• Neil Bohr

• J J Thomson

• Ernest Rutherford

• James Chadwick

If an electron revolving around a nucleus on absorbing the energy jumps from ground state to 4^th excited state then what should be the value of n of that energy level

• 5

• 4

• 3

• 6