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TS Polycet (Polytechnic) 2017 Previous Question Paper with Answers And Model Papers With Complete Analysis

Section — II
PHYSICS

61)The magnetic field is called uniform if

A) strength and direction of magnetic field are changing

B) strength and direction of magnetic field are constant

C) only magnetic field strength is constant

D) only direction of magnetic field is constant

View Answer

B) strength and direction of magnetic field are constant

62)Which of the following equations is correct in electromagnetism?

A) F = $\frac{qv}{B\;\;\sin\theta}$

B) F = $\frac{q\;B\;\sin\theta}v$

C) F = qv B sin θ

D) F = qv B cos θ

View Answer

C) F = qv B sin θ

63)In which of the following electric energy is converted into mechanical energy?

A) Galvanometer

B) Ammeter

C) Generator

D) Electric motor

View Answer

D) Electric motor

64)Whenever there is continuous change of magnetic flux linked with closed coil, a current is generated in coil. This is

A) Lenz’s law

B) Ampere’s law

C) Faraday’s law

D) Ohm’s law

View Answer

C) Faraday’s law

65)A conductor of length 1 m moving with velocity V perpendicular to the magnetic field of strength 10 tesla induces an e.m.f. of 10 volt. Then V = ________m/s

A) 100

B) 10

C) 1

D) 0.1

View Answer

C) 1
Explanation:V = ∑/B = 10/10 = 1 m/s

66)The peak value of alternative current is 2 ampere. The r.m.s. value of current is ______ampere.

A) √2

B) 2√2

C) 1/√2

D) 1/2√2

View Answer

A) √2

67)Magnetic flux density (B) =

A) $\frac{Area}{Magnetic\;flux}$

B) $\frac{Length}{Magnetic\;flux}$

C) $\frac{Magnetic\;flux}{Length\;}$

D) $\frac{Magnetic\;flux}{Area}$

View Answer

D) $\frac{Magnetic\;flux}{Area}$

68)A light ray incidents on a plane mirror at an angle 33°. Then what is the angle of reflection?

A) 66°

B) 33°

C) 22°

D) 11°

View Answer

B) 33°

69)Which of the following is used by the dentists?

A) Convex lens

B) Concave lens

C) Convex mirror

D) Concave mirror

View Answer

D) Concave mirror

70)Which of the following is true in case of virtual image?

A) Always erect

B) Always inverted

C) Obtained on screen

D) None of the above

View Answer

A) Always erect

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Section — II PHYSICS

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Section — II
PHYSICS