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NEET Physics Solved Question Paper 2005

Multiple Choice Questions

31.

When temperature of an ideal gas is increased from 27°C to 227°C, its rms speed is changed from 400 m/s to v_s Then, v_s is

516 m/s
450 m/s
310 m/s
746 m/s

32.

A prism of refractive index $\sqrt{2}$ has a refracting angle of 60°. At what angle a ray must be incident on it so that it suffers a minimum deviation.

45⁰
60⁰
90⁰
180⁰

33.
The radius of the convex surface of planoconvex lens is 20 cm and the refractive index of the material of the lens is 1.5. The focal length is

30cm

50 cm

30 cm

40 cm

40 cm

For refraction through a spherical interface (from medium 1 to 2 of refractive index n₁ and n₂respectively)

$\frac{n_{2}}{ν} - \frac{n_{1}}{μ} = \frac{n_{2} - n_{1}}{R} Thin lens formula \frac{1}{μ} - \frac{1}{ν} = \frac{1}{f}$

Lens maker formula

$\frac{1}{f} = \frac{(n_{2} - n_{1})}{n_{1}} (\frac{1}{R_{1}} - \frac{1}{R_{2}})$

Using the relation for focal length of planoconvex lens

$= \frac{1}{f} = (μ - 1) (\frac{1}{R_{1}} - \frac{1}{R_{2}}) Refractive index of material of lens μ = 1.5 cm, R_{1} = 20 cm and R_{2} = \infty \frac{1}{f} = (1.5 - 1) (\frac{1}{20} - \frac{1}{\infty}) \Rightarrow \frac{1}{f} = \frac{1}{40} or f = 40 cm$

34.

If work function of a metal is 4.2 eV, the cut off wavelength is

8000 A^o
7000 A^o
1472 A^o
2950 A^o

35.

The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be

2900 A^o
2500 A^o
5380 A^o
1200 A^o

36.

A short linear object of length b lies along the axis of a concave mirror of focal length ' f ' at a distance 'u' from the pole of the mirror, what is the size of image?

$(\frac{f}{u - f}) b$
${(\frac{f}{u - f})}^{2} b$
$(\frac{f}{u - f}) b^{2}$
$(\frac{f}{u - f})$

37.

The minimum wavelength of X-ray emitted by X-ray tube is 0.4125 A^o. The accelerating voltage is

30 kV
50 kV
80 kV
60 kV

38.

The refractive index of the material of the prism and liquid are 1.56 and 1.32 respectively. What will be the value of 0 for the following refraction?

$\sin θ \geq \frac{13}{11}$
$\sin θ \geq \frac{11}{13}$
$\sin θ \geq \frac{\sqrt{3}}{2}$
$\sin θ \geq \frac{1}{\sqrt{2}}$

39.

What should be the minimum value of refractive index of the material of the prism for the reflections to take place as shown in the figure?

40.

A person who can see things most clearly at a distance of 10 cm, requires spectacles to enable to see clearly things at a distance of 30 cm. What should be the focal length of the spectacles?