Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

NEET Physics Solved Question Paper 2003

Multiple Choice Questions

41.
A double slit experiment is performed with light of wavelength 500 nm. A thin film of thickness 2 μm and refractive index 1.5 is introduced in the path of the upper beam. The location of central maximum will

remain unshifted

shift downward by nearly two fringes

shift upward by nearly two fringes

shift downward by 10 fringes

shift upward by nearly two fringes

Wavelength λ = 500 nm = 500 × 10^-9 m

Thickness of the film t = 2 μm = 2 × 10^-6 m

Refractive index μ = 1.5

Where there is no thin film placed in the path of any one of the two beams, the path difference between them is given by dy/D ( considering the two beams meetings at a point P ). In case we put a thin film in the path of one of the beams, then the optical path of that beam gets longer.

Now for the central maximum, path difference in the absence of the film is Δx = 0. But when we put the film, the path difference becomes

Δx = μt $-$ t

= ( μ $-$ 1 ) t

= ( 1.5 $-$ 1 ) × 2 × 10^-6

= 10^-6

Δx = 1 mm

Now,

Δx = $\frac{dy}{D}$

⇒ y = $\frac{D}{d}$ Δx

⇒ y = $\frac{D}{d}$ × 0.5 × 1 μm

⇒ = 2 × $\frac{D}{d} \times \frac{1}{2}$ × 1 μm

⇒ y = 2 W

As the film is placed in the path of the upper beam the cenr=tral maximum will shift upward by nearly two fringes.

42.

If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the same

energy
momentum
velocity
angular momentum

43.

Characteristic X-rays are produced due to

transfer of momentum in collision of electrons with target atoms
transition of electron from higher to lower electrons orbits in an atom
heating of the target
transfer of energy in collision of electrons with atoms in the target

44.

In an experiment to find the focal length of a concave mirror a graph is drawn between the magnitudes of u and v. The graph looks like

45.

Nuclear fusion is possible

only between light nuclei
only between heavy nuclei
between both light and heavy nuclei
only between nuclei which are stable against β-decay

46.

Radioactive nuclei that are injected into a patient collect at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can then be recorded by a detector. This procedure provides an important diagnostic tool called

gamma camera
CAT scan
radiotracer technique
gamma ray spectrosccopy

47.

In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma ray photons. This process forms the basis of an important diagnostic procedure called

MRI
PET
CAT
SPECT

48.

An astronaut is looking down on earth's surface from a space shuttle at an altitude of 400 km.
Assuming that the astronaut's pupil diameter is 5 mm and the wavelength of visible light is 500 nm, the astronaut will be able to resolve linear objects of the size about

0.5 m
5 m
50 m
500 m

49.

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

10 mV
0.1 mV
1.0 mV
10 V

50.

Assertion: A tube light emits white light.

Reason: Emission of light in a tube takes place at a very high temperature.

if both assertion and reason are true and the reason is the correct explanation of the assertion
if both assertion and reason are true and the reason is not the correct explanation of the assertion
if assertion is true but reason is false
if both assertion and reason are false statements