Q). If 5 Ω, 10 Ω and 15 Ω are connected in series, then the resultant resistance R =
A) 30 Ω
B) 25 Ω
C) 5 Ω
D) 15 Ω
Q). The graph between potential, difference (V) and electric current (1) in a circuit for ohmic conductor is
A) parabola
B) circle
C) straight line
D) curved line
Q). Which of the following is used to prevent damages due to overloading to the household circuit?
A) Switch
B) Fuse
C) Resistance
D) All of these
Q). Three resistors of resistances 3 Ω, 4 Ω and 6 Ω are connected in parallel. The combination is connected to a battery of 8 V. The current in the circuit is
A) 4 A
B) 3 A
C) 6 A
D) 8 A
Q). Read the following statement and indicate which law states that:
“There is no accumulation of electric charges at any junction in an electric circuit.”
A) Kirchhoff’s junction law
B) Kirchhoff’s loop law
C) Ohm’s law
D) Coulomb’s law
Q). The magnetic force experienced by a charge q moving with a velocity v perpendicular to the magnetic field B is
A) F = qv/B
B) F = qvB
C) F = B/qv
D) F = Bv/q
Q). In electric motors
A) electrical energy is converted into mechanical energy
B) mechanical energy is converted into electrical energy
C) electrical energy is converted into light energy
D) mechanical energy is converted into light energy
Q). A current – carrying circular coil has n turns. The magnetic field produced in the entire coil is
A) 1/n times as large as that produced by a single turn
B) same as that produced by a single turn
C) n times as large as that produced by a single turn
D) zero
Q). The SI unit of resistivity is
A) ohm
B) ohm-m
C) volt
D) ampere
Q). A conductor of 1 m length is moving with a speed of 10 m/s in the direction perpendicular to the direction of magnetic field of induction 0.8 T. The induced e.m.f. between the ends of the conductor is
A) 10 V
B) 1 V
C) 2 V
D) 8 V
Good