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NEET Physics Solved Question Paper 2006

Multiple Choice Questions

11.
Which of the following diagrams represents the variation of electric field vector with time for a circularly polarized light?

When two-polarised waves are superimposed then under certain conditions, the resultant light vector rotates with a constant magnitude in a plane perpendicular the direction propagation. The trip of vector traces a circle and the light is said to be circularly polarised.

To form circularly polarised light

E_x = E₀ sin ωt

E_y = E₀ cos ωt = E₀ sin $(ωt + \frac{π}{2})$

where E₀ is amplitude

Resultant amplitude

${|E|}^{2} = E_{0} + E_{0} + 2 E_{0} . E_{0} \cos \frac{π}{2}$

${|E|}^{2} = E_{0} \sqrt{2}$ = constant

Hence the correct graph will be (a).

12.

Three objects coloured black, gray and white can withstand hostile conditions upto 2800^°C. These objects are thrown into a furnace where each of them attains a temperature of 2000^°C. Which object will glow brightest?

The white object
The black object
All glow with equal brightness
Gray object

13.

Two balloons are filled, on with pure He gas and other by air, respectively. If the pressure and temperature of these balloons arc same then the number of molecules per unit volume is

more in the He filled balloon
same in both balloons
more in air filled balloon
in the ratio of 1 : 4

14.

When a guitar string is sounded with a 440 Hz tuning fork, a beat frequency of 5 Hz is heard. If the experiment is repeated with a tuning fork of 437 Hz, the beat frequency is 8 Hz. The string frequency (Hz) is

15.

When you make ice cubes, the entropy of water

does not change
increase
decreases
may either increase or decrease depending on the process used

16.

A bimetallic strip consists of metals X and Y. It is mounted rigidly at the base as shown. The metal X has a higher coefficient of expansion compared to that for metal Y. When the bimetallic strip is placed in a cold bath

it will bend towards the right
it will bend towards the left
it will not bend but shrink
it will neither bend or shrink

17.

For a wave propagating in a medium, identify the property that is independent of the others.

Velocity
Wavelength
Frequency
All these depend on each other

18.

Assertion: In an isolated system the entropy increases.

Reason: The processes in an isolated system are adiabatic.

If both assertion and reason are true and reason is the correct explanation of the assertion
If both assertion and reason are true but reason is not the correct explanation of the assertion
If assertion is true, but reason is false
Both assertion and reason are false statements

19.

Assertion: The root mean square and most probable speeds of the molecules in a gas are the same.

Reason: The Maxwell distribution for the speed of molecules in a gas is symmetrical.

If both assertion and reason are true and reason is the correct explanation of the assertion
If both assertion and reason are true but reason is not the correct explanation of the assertion
If assertion is true, but reason is false
Both assertion and reason are false statements

20.

Assertion: Use of ball bearings between two moving parts of a machine is a common practice.

Reason: Ball bearings reduce vibrations and provide good stability.

If both assertion and reason are true and reason is the correct explanation of the assertion
If both assertion and reason are true but reason is not the correct explanation of the assertion
If assertion is true, but reason is false
Both assertion and reason are false statements