Subject

Physics

Class

NEET Class 12

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NEET Physics Solved Question Paper 2007

Multiple Choice Questions

31.

CO₂ laser uses

microwaves
infra red
ultra violet
visible light

32.

In an AC circuit the potential differences across an inductance and resistance joined in series are respectively 16 V and 20 V. The total potential difference of the source is

20.0 V
25.6 V
31.9 V
53.5 V

33.
The focal length of the objective and eye lenses of a microscope are 1.6 cm and 2.5 cm respectively. The distance between the two lenses is 21. 7 cm. If the final image is formed at infinity. What is the linear magnification?

11

110

1.1

44

110

Here v_O = L $-$ f_e

= 21.7 cm $-$ 2.5 cm

v_O = +19.2 cm

+ve sign shows that image is real.

For a objective lens

$\frac{1}{u_{O}} + \frac{1}{v_{O}} = \frac{1}{f_{O}}$

[ using real-virtual sign convention]

∴ $\frac{1}{u_{O}} = \frac{1}{f_{O}} - \frac{1}{v_{O}}$

∴ $\frac{1}{u_{O}} = \frac{1}{(+ 1.6)} - \frac{1}{(+ 19.2)}$

$\frac{1}{u_{O}} = \frac{19.2 - 1.6}{(1.6) (19.2)}$

u_O = +1.745 cm

+ve sign shows that object is real.

When the image is formed at infinity, the magnification is given by

m = $(\frac{v_{O}}{u_{O}}) (\frac{D}{f_{e}})$

D is the distance of distinct vision.

∴ m = $(\frac{19.2 cm}{1.754 cm}) (\frac{25 cm}{2.5 cm})$

m = 110.

34.

The magnetic susceptibility of an ideal diamagnetic substance is

$-$ 1
0
+1
∞

35.

Assertion: : A current continues to follow in superconducting coil even after switch is off.

Reason: Superconducting coils show Meissner effect.

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

36.

Assertion: Dipole oscillations produce electromagnetic waves.

Reason: Accelerated charge produces electromagnetic waves.

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

37.

Asserion: : NAND is a universal gate.

Reason: It can be used to describe all other logic gates.

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

38.

Assertion: In a cavity within a conductor, the electric field is zero.

Reason: Charges in a conductor reside only at its surface.

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

39.

Assertion: Ferro magnetic substances become paramagnetic above Curie temperature.

Reason: Domains are destroyed at high temperature.

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

40.

Assertion: Ohm's law is applicable for all conducting elements.

Reason: Ohm's law is a fundamental law.

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