Q). Which among the following components helps in preventing damages due to over loading?
A) Capacitor
B) Battery
C) Generator
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
Q). In which among the following, the electrical energy is converted into mechanical energy?
A) Motor
B) Battery
C) Generator
D) Switch
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
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
Q). When water freezes, its volume
A) remains constant
B) decreases
C) increases
D) increases and decreases alternatively
Q). The reverse process of evaporation is
A) condensation
B) freezing
C) melting
D) oxidation
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
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
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