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Quiz 4
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Q.1
The S.I. unit of power is
Henry
Coulomb
Watt
Watt-hour
Q.2
A thermistor has
Positive temperature coefficient
Negative temperature coefficient
Zero temperature coefficient
Variable temperature coefficient
Q.3
Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as
4 : 25
25 : 4
2 : 5
5 : 2
Q.4
For testing appliances, the wattage of test lamp should be
Very low
Low
High
Any value
Q.5
Resistance of a material always decreases if
Temperature of material is decreased
Temperature of material is increased
Number of free electrons available becomes more
None of the above is correct
Q.6
The rating of a fuse wire is always expressed in
Ampere-hours
Ampere-volts
kWh
Amperes
Q.7
The thickness of insulation provided on the conductor depends on
The magnitude of voltage on the conductor
The magnitude of current flowing through it
Both (A) and (B)
None of the above
Q.8
If the efficiency of a machine is to be high, what should be low?
Input power
Losses
True component of power
kWh consumed
Q.9
When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is
1 n-mho
106 mho
1 milli-mho
None of the above
Q.10
An instrument which detects electric current is known as
Voltmeter
Rheostat
Watt-meter
Galvanometer
Q.11
All of the following are equivalent to watt except
(Amperes) ohm
Joules/sec.
Amperes × volts
Amperes/volt
Q.12
A rheostat differs from potentiometer in the respect that it
Has lower wattage rating
Has higher wattage rating
Has large number of turns
Offers large number of tapping
Q.13
The minimum charge on an ion is
Equal to the atomic number of the atom
Equal to the charge of an electron
Equal to the charge of the number of electrons in an atom (#) zero
None of these
Q.14
Current velocity through a copper conductor is
the same as propagation velocity of electric energy
independent of current strength
of the order of a few micro m/s
nearly 3 x 10
8
m/s
Q.15
For which of the following 'ampere second' could be the unit?
Reluctance
Charge
Power
Energy
Q.16
Two resistances Rl and Ri are connected in series across the voltage source where Rl > Ri. The largest drop will be across
Rl
Ri
Either Rl or Ri
None of them
Q.17
A closed switch has a resistance of
Zero
About 50 ohms
About 500 ohms
Infinity
Q.18
A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will:
Decrease
Increase
Remain same
Heater will burn out
Q.19
The resistivity of alloy manganin is
Nearly independent of temperature
Increases rapidly with increase in temperature
Decreases with increase in temperature
Increases rapidly with decrease in temperature
Q.20
In a Wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will
change in previous direction
not change
change in opposite direction
none of these.
Q.21
N a potentiometer ofwires, the balance point is obtained on the 7th wire. To shift the balance point to 9th wire, we should
decrease resistance in the main circuit.
increase resistance in the main circuit.
decrease resistance in series with the cell whose emf is to be measured.
increase resistance in series with the cell whose emf is to be determined.
Q.22
In parallel combination of n cells, we obtain
more voltage
more current
less voltage
less current
Q.23
Drift velocity vd varies with the intensity of electric field as per the relation
(vd ∝ E
vd ∝ 1/E
vd = constant
vd ∝ E²
Q.24
For measurement of potential difference, a potentiometer is preferred over voltmeter because
potentiometer is more sensitive than voltmeter.
the resistance of potentiometer is less than voltmeter.
potentiometer is cheaper than voltmeter.
potentiometer does not take current from the circuit.
Q.25
Who invented the light bulb
Thomas Edison
Joseph Swan
Hiram Maxim
All of above
Q.26
What is Coulombs Law
a law stating that like charges repel and opposite charges attract, with a force proportional to the product of the charges and inversely proportional to the square of the distance between them
a law stating that like charges repel and opposite charges attract, with a food proportional to the product of the charges and inversely proportional to the square of the distance between them
a law stating that like charges attract and opposite charges attract, with a force proportional to the product of the waste and inversely proportional to the square of the distance between them
a cafeteria stating that like charges repel and opposite charges attract, with a force proportional to the product of the charges and inversely proportional to the square of the distance between them
Q.27
What is a electro magnet
a hard rubber core made into a magnet by the passage of electric current through a coil surrounding it
a soft rubber core made into a magnet by the passage of electric current through a coil surrounding it
a hard metal core made into a magnet by the passage of electric current through a coil surrounding it
a soft metal core made into a magnet by the passage of electric current through a coil surrounding it
Q.28
What is the power of alight bulb withA running through it?
0.15W
6W
60W
6.67W
Q.29
Which of the following characteristics of electrons determines the current in a conductor?
Drift velocity alone
Thermal velocity alone
Both A and B
Neither A nor B
Q.30
A material in which electrons are not able to move easily
Circuit
Insulator
Resistance
Conductor
0 h : 0 m : 1 s
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