1. Bulbs in street lighting are connected to all
(A) parallel
(B) series
(C) Series-parallel
(D) End-to-end
Answer: (A)
2. Test lamp must have wattage for testing
appliances
(A) is very low
(B) less
(C) high
(D) any value
Answer: (C)
3. Switching a lamp in a house produces noise in the
radio. This is because switching produces operation
(A) arcs to separate contacts
(B) High intensity mechanical noise
(C) arcs between both mechanical noise and contacts
(D) None of the above
Answer: (A)
4. When a load is switched off in a circuit,
sparking occurs due to whose value is higher in the circuit.
(A) resistance
(B) induction
(C) Capacity
(D) impedance
Ans: (B)
5. A copper wire of fixed length and resistance is
stretched and stretched three times its length without changing its volume, how
much will the resistance of the wire change
(A) 1/9 times
(B) 3 times
(C) 9 times
(D) unchanged
Answer: (C)
6. When the resistance element of a heater fuses and
then we reconnect it after removing a part of it, what will be the power
expenditure of the heater
(A) deficiency
(B) growth
(C) remain constant
(D) None of the above
Ans: (B)
7. A field of force can only exist between
(A) two molecules
(B) two ions
(C) two atoms
(D) two metal particles
Ans: (B)
8. A substance whose molecules have dissimilar
atoms.
(A) semi-conductor
(B) super conductor
(C) compound
(D) insulator
Answer: (C)
9. International ohm is defined in terms of
resistance
(A) A column of mercury
(B) a cube of carbon
(C) A cube of copper
(D) unit length of wire
Answer: (A)
10. Three resistors are connected first in parallel
and then in series. The resulting resistance of the first to second combination
will be
(A) 9 times
(B) 1/9 times
(C) 1/3 time
(D) 3 times
Ans: (B)
11. Which method can be used for absolute measurement
of resistors?
(A) Lorentz method
(B) Rayleigh method
(C) Ohm’s law method
(D) Wheatstone bridge method
Answer: (D)
12. Three 6 ohm resistors are connected to form a
triangle. What is the resistance between any two corners?
(A) 3/2 Ohms
(B) 6 Ohms
(C) 4 Ohms
(D) 8/3 Ohms
Answer: (C)
13. Ohm's law does not apply.
(A) semi-conductor
(B) D.C circuit
(C) small resistors
(D) high currents
Answer: (A)
14. Two copper conductors have the same length. The
cross-sectional area of one conductor is four times that of another. If the
conductor with a small cross-sectional area has a resistance of 40 ohms, the resistance of the other conductors will be
(A) 160 ohm
(B) 80 ohms
(C) 20 ohms
(D) 10 ohm
Answer: (D)
15. Temperature coefficient of resistance is expressed in terms
of
(A) Ohm / ° C
(B) mhos/ohm ° C
(C) ohm/ohm ° C
(D) mhos / ° C
Answer: (A)
16. The resistance of the filament of a hot bulb is
greater than the filament resistance of a cold bulb because of the temperature co-efficient of
the filament is.
(A) zero
(B) negative
(C) positive
(D) about 2 ohms per degree
Answer: (C)
17. Heat produced in a conductor is passed by an
electric current.
(A) reaction
(B) capacitance
(C) impedance
(D) resistance
Answer: (A)
18. Insulation is provided on a current carrying
conductor.
(A) To prevent leakage of current
(B) to prevent shock
(C) Both of the above factors
(D) None of the above factors
Answer: (C)
19. The thickness of insulation provided on the
conductor depends
(A) the magnitude of the voltage on the conductor
(B) the magnitude of the current flowing through it
(C) Both (A) and (B)
(D) None of the above
Answer: (A)
20. Which of the following materials has the lowest
resistivity?
(A) zinc
(B) lead
(C) mercury
(D) copper
Answer: D
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