TS Polycet (Polytechnic) 2015 Previous Question Paper with Answers And Model Papers With Complete Analysis

Q). Which among the following components helps in preventing damages due to over­ loading?
A) Capacitor
B) Battery
C) Generator
D) Electric fuse

View Answer
D) Electric fuse

Q). A conductor of length I is moving with a speed of v in the direction perpendicular to the direction of the magnetic field of induction B. The motional EMF is given by
A) B/vl
B) Blv
C) Bl/v
D) Bv2l

View Answer
B) Blv

Q). In which among the following, the electrical energy is converted into mechanical energy?
A) Motor
B) Battery
C) Generator
D) Switch

View Answer
A) Motor

Q). If △∅/△t is the rate of change of flux and I is the current, then the electric power is
A) I(△t/△∅)
B) I(△∅/△t)
C) I2(△∅/△t)
D) △∅/△t

View Answer
B) I(△∅/△t)

Q). If Io and Vo are the peak values of AC and AC-EMF for an AC generator, then their r.m.s. values respectively are
A) Io/2, Vo/2
B) Io/√2, Vo/√2
C) Io√2, Vo√2
D) 2Io, 2Vo

View Answer
B) Io/√2, Vo/√2

Q). When water freezes, its volume
A) remains constant
B) decreases
C) increases
D) increases and decreases alternatively

View Answer
C) increases

Q). The reverse process of evaporation is
A) condensation
B) freezing
C) melting
D) oxidation

View Answer
A) condensation

Q). Which one among the following is an example of condensation?
A) Disappearance of water when clothes are dried
B) Getting sweat while doing work
C) Formation of water droplets on the flower in early morning
D) Wilting of plants

View Answer
C) Formation of water droplets on the flower in early morning

Q). If u, v and f are the object distance, image distance and focal length respectively, then the mirror formula is given by
A) f = 1/u + 1/v
B) 1/f = u + v
C) 1/f = 1/u + 1/v
D) 1/2f = 1/u + 1/v

View Answer
C) 1/f = 1/u + 1/v

Q). If an object is placed between the focus (F) and the centre of curvature (Q on the principal axis of a concave mirror, then the position of the image is
A) behind the mirror
B) at infinity
C) between F and C
D) beyond C

View Answer
D) beyond C

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