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88.

87.

Mirage is a phenomena due to :
(ಹಿ) reflection of light (B) interference of light
(C) total internal reflection of light (D) diffraction of light

A small object lies on the axis of a eylindrically symmetric optical system. The image will
suffer from :

(A) spherical aberration, coma and astigmatism

(18) spherical aberration and coma

(C) spherical aberration and astigmatism

(D) spherical aberration

Two thin lenses have a combined power of +10 dioptres. When separated by 20 cm, their
equivalent power is +6.25 dioptres. Their individual powers, in dioptres, are:

(ಗಿ) 7.8 ஊம்‌ 2.5 (B) 3.5and 6.5

(©) 5.0and5.0 യു 9.0and 1.0
Two photons recede from each other, Their relative veloeity will be :

(ಸ) 0 B ६

© < (7) ८

In the Fourier series / (2) = † (0) + ந a, CO8 nx + സ്ത sin nx the value of a, is given by :

عر احور
‎ಯ) a, = [ரவணன்‌ (08) च *-—IJ’,I(I}WG'“*‏
اع 5 ‎नै‏
‏⋅ ⋅↥ ⋅ 1
‎a,= ध பன்னு nx dx (0 = ष [நவ nx dx‏ ©

In a half adder, the Boolean equations for the outputs are :
(മ SUM = A+B, CARRY=A @B (B) SUM = A®R, CARRY=AB
(C) SUM=A+B, CARRY=B (M) SUM=A- B, CARRY=A®B

Which of the following are true in case of negative feedback amplifiers?
(1) Stability of the amplifier increases
(2) Distortion of the amplifier decreases
(3) Noise in the amplifier decreases
(4) Band-width of the amplifier decreases.
Select the correct answer using the codes given below

Codes :
(A) 1,2and3 (ए) 1, 4
(C) 1.3 4 (D) 2, 384

71/2014 12 A