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NEET Physics Solved Question Paper 2017

Multiple Choice Questions

51.
Two thin lenses when placed in contact, then the power of combination is +10D. If they are kept 0.25 m apart, then the power reduces to +6D. The focal lengths of the lenses (in m) will be

0.5 and 0.125

0.5 and 0.75

0.125 and 0.75

Both have same focal length i.e. 1.25

0.5 and 0.125

$When lenses are in contact, then power P = \frac{1}{F} = \frac{1}{f_{1}} + \frac{1}{f_{2}} 10 = \frac{1}{f_{1}} + \frac{1}{f_{2}} . . . . . (i) When they are placed at distance d apart P' = \frac{1}{F'} = \frac{1}{f_{1}} + \frac{1}{f_{2}} - \frac{d}{f_{1} f_{2}} 6 = \frac{1}{f_{1}} + \frac{1}{f_{2}} - \frac{0.25}{f_{1} f_{2}} . . . . . (ii) From Eqs . (i) and (ii), we get f_{1} f_{2} = \frac{1}{16} . . . . (iii) From Eqs . (i) and (iii), we get f_{1} + f_{2} = \frac{5}{8} . . . . (iv) Also, {(f_{1} - f_{2})}^{2} = {(f_{1} + f_{2})}^{2} - 4 f_{1} f_{2} = (\frac{5}{8}) - 4 \times \frac{1}{16} = \frac{9}{64} or f_{1} - f_{2} = \frac{3}{8} . . . . . (v) Solving Eqs . (iv) and (v), we get f_{1} = 0.5 m an f_{2} = 0.125 m$

52.

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, then the linear magnification is

53.

A lens of focal length 1 m forms Fraunhofer diffraction pattern of a single slit of width 0.04 cm in its focal plane. The incident light contains two wavelengths λ₁ and λ₂ . It is found that the fourth minimum corresponding to λ₁and fifth minimum corresponding to λ₂ occur at the same point 0.5 cm from central maximum, then λ₁ and λ₂ are

400 nm, 500 nm
500 nm, 700 nm
700 nm, 500 nm
500 nm, 400 nm

54.

A thin prism placed in air produces minimum deviation of 4° in a light ray. If the prism 8 m is immersed in water, then the minimum deviation produced by it is

55.

An astronomical telescope arranged for normal adjustment has a magnification of 6. Ifthe length ofthe telescope is 35cm, then the focal length of objective and eye piece respectively, are

30 cm, 5 cm
5 cm, 30 cm
40 cm, 5 cm
30 cm, 6 cm

56.

Which element has K_$α$ line of wavelength in 1.785 $\overset{°}{A}$ ?

Copper
Cobalt
Sodium
Aluminium

57.

The fossil bone has a ¹⁴C : ¹²C ratio which is (1 / 16) of that in a living animal bone. If the half-life time of ¹⁴C is 5730 years, thus the age of the fossil bone is

11460 years
17190 years
22920 years
45840 years

58.

A Zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in figure. The current through the diode is

5 mA
10 mA
15 mA
20 mA

59.

In the following circuit, the output Y becomes one for the inputs

A= 0, B = 1, C = 0
A = 1, B = 1, C = 0
A =1, B= 1, C = 1
A = 1, B= 0, C = 1

60.

The energy levels of a certain atom are represented in the figure given below. During the transition from 2E to E level, a photon of wavelength is emitted. The wavelength of photon produced during transition from 4 / 3E level to E will be