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NEET Physics Solved Question Paper 2006

Multiple Choice Questions

41.
Ionization potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory, the spectral lines emitted by hydrogen will be

two

three

four

four

three

Ionization energy corresponding to ionization potential = -13.6 eV.
Photon energy incident = 12.1 eV
So, the energy of electron in excited state
= -13.6 + 12.1 = -1.5 eV
i.e.,

i.e., energy of electron in excited state corresponds to third orbit.
The possible spectral lines are when electron jumps from orbit 3rd to 2nd; 3rd to 1st and 2nd to 1st. Thus, 3 spectral lines are emitted.

1794 Views

42.

A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again?

1 cm upward
4.5 cm downward
1 cm downward
1 cm downward

837 Views

43.

A transistor is operated in common emitter configuration at constant collector voltage V_c = 1.5 V such that a change in the base current from 100 µA to 150 µA produces a change in the collector current from 5 mA to 10 mA. The current gain (β) is

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44.

A forward biased diode is

467 Views

45.

A photo-cell employs photoelectric effect to convert

change in the frequency of light into a change in electric voltage
change in the intensity of illumination into a change in photoelectric current
change in the intensity of illumination into a change in the work function of the photocathode
change in the intensity of illumination into a change in the work function of the photocathode

429 Views

46.

When photons of energy hv fall on an aluminium plate (of work function E₀), photoelectrons of maximum kinetic energy K are ejected. If the frequency of the radiation is doubled, the maximum kinetic energy of the ejected photoelectrons will be

K+E₀
2K
K
K

490 Views

47.

The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B and C are as shown below:

The logic curcuit gate is

AND gate
NAND gate
NOR gate
NOR gate

468 Views

48.

The momentum of a photon of energy 1 MeV in kg m/s, will be

$0.33 space cross times space 10 to the power of 6$
$7 cross times 10 to the power of negative 24 end exponent$
$10 to the power of negative 22 end exponent$
$10 to the power of negative 22 end exponent$

750 Views

49.

The radius of germanium (Ge) nuclide is measured to be twice the radius of $Be presubscript 4 presuperscript 9.$ The number of nucleons in Ge are

703 Views

50.

A convex lens and a concave lens, each having same focal length of 25 cm, are put in contact to form a combination of lenses. The power in diopters of the combination is