TS Polycet (Polytechnic) 2020 Previous Question Paper with Answers And Model Papers With Complete Analysis

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Section — II
PHYSICS

61)What is the position of the image if the object is placed beyond the centre of curvature on the principal axis of convex lens?

A) at F

B) at C

C) between C and F

D) at infinity

View Answer

C) between C and F

62)Two metallic wires ‘A’ and ‘B’ are having same cross-sectional areas and same current passes through them. Find ratio of drift velocity of electrons in wire ‘A’ and B’.

A) 8/9

B) 9/8

C) 16/27

D) 27/16

View Answer

B) 9/8
Explanation:Ratio of drift velocity of electrons in wire ‘A’ and ‘B’
= \begin{array}{l}\frac1{Electron\;density\;of\;wire\;A}\\\frac1{Electron\;density\;of\;wire\;B}\end{array}
= \begin{array}{l}\frac1{Electron\;density\;of\;wire\;B}\\\frac1{Electron\;density\;of\;wire\;A}\end{array}
= \frac{9.0x1028m-3}{8.0x1028m-3} = 9/8
[Because of same cross-sectional areas and same current passes]

63)Three conductors having resistance values 2 ohm, 3 ohm and 4 ohm are connected in parallel. Find equivalent resistance.

A) 20 ohm

B) 9 ohm

C) 13/12 ohm

D) 12/13 ohm

View Answer

D) 12/13 ohm
Explanation:Equivalent resistance
1/R = 1/R1+1/R2+1/R3
1/R = 1/2+1/3+1/4 = \frac{6+4+3}{12} = 3/12
∴ R = 12/13 ohm

64)What is the lens makers formula?

A)

B)

C)

D)

View Answer

B)

65)Which of the following relation is correct regarding potential difference (V)?

A) V = FI/q

B) V= Fq/I

C) V=I/Fq

D) V=q/FI

View Answer

A) V = FI/q

66)Which of the following materials has high value of specific resistance?

A) Copper

B) Silicon

C) Glass

D) Iron

View Answer

C) Glass

67)When two ends of a conductor are connected to terminals of battery, what happens inside conductor?

A) Electrons move randomly

B) Electrons come to rest

C) Non-uniform electric field creates

D) Uniform electric field creates

View Answer

D) Uniform electric field creates

68)What is the focal length of a double concave lens kept in air with two spherical surfaces of radii R1 = 30 cm, R1 = 60 cm and refractive index of glass is n = 1.5 ?

A) 40cm

B) -40cm

C) 50cm

D) -50cm

View Answer

B) -40cm
Explanation:1/f = (n-1) (1/R1+1/R2)
= (1.5-1)(1/-30 – 1/60)
= (0.5) (-2-1/60) = 0.5x-3/60 = -0.5/20
∴ f= 20/0.5 = 200/-5 = -40cm

69)If force acting on current carrying conductor inside a magnetic field is F = \frac{IlB}{\sqrt2}. Find the angle between plane of 72conductor and magnetic field intensity direction.

A) 90°

B) 60°

C) 45°

D) 30°

View Answer

C) 45°
Explanation:F = IlB sinθ =IlB/ √2
∴ sinθ = 1/ √2 = 45°

70)The graph shows relation between induced emf (∅) and time (t). During which time period there is no change in induced electromotive force?

A) 6 to 12

B) 2 to 6

C) 0 to 6

D) 6 to 8

View Answer

B) 2 to 6
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