A neon flashlight cell with an emf of 1.5V gives a current of 15A when connected directly to an ammeter of resistance 0.04?. Internal resistance of the cell is
1.0.0004?
2.0.06?
3.0.10?
4.0.13?
All electrical appliances are connected in parallel to each other between the main line and neutral wire to get
1.same current
2.same current and potential difference
3.different current but same potential difference
4.different current and potential differences
Electrical energy is measured in
1.watt
2.horse power
3.kilo watt
4.kilowatt hour
If 1 ampere current flows through 2m long conductor the charge flow through it in 1 hour will be
1.3600C
2.7200C
3.1C
4.2C
Internal resistance is the resistance offered by
1.source of e m f
2.conductor
3.resistor
4.capacitor
Reciprocal of resistivity is called
1.resistance
2.inductance
3.conductivity
4.flexibility
Resistance between points A and B in the circuit shown in figure is
1.4?
2.6?
3.10?
4.8?
Terminal potential difference of a battery is greater than its emf when
1. the internal resistance of battery is infinite
2.the internal resistance of battery is zero
3.the battery is charged
4.the battery is discharged
Three bulbs are rating 40W 60W and 100W designed to work on 220V mains. Which bulb will burn most brightly if they are connected in series across 220 V mains?
1.40 W bulb
2.60 W blub
3.100 W blub
4.all will burn equally brightly
Which one of the following materials is useful for making bulb filaments?
1.constantan
2.nichrome
3.copper
4.tungsten
A wire having very high value of conductance is said to be
1.very good conductor
2.moderately good conductor
3.an insulator
4.no specific criterion available
A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part
1.remains the same
2.is doubled
3.is halved
4.becomes zero
An immersion heater of 400 watts kept on for 5 hours will consume electrical power of
1.2KWh
2.20KWh
3.6KWh
4.12KWh
How much heat does a 40 W bulb generates in one hour?
1.144000J
2.144J
3.1.44J
4.14J
In liquids and gases the current is due to the motion
1.negative charges
2. positive charges
3.both negative and positive charges
4.neutral particles
One kilowatt hour is the amount of energy delivered during
1.one second
2.one day
3.one minute
4.one hour
Production of heat due to an electric current flowing through a conductor is given by
1.Joule effect
2.Joule Thomsons effect
3.Comptons effect
4.Feed back effect
Resistance of a super conductor is
1.finite
2.infinite
3.zero
4.changes with every conductor
Resistance of a wire on increasing its temperature will
1.increase with rise in temperature
2.decrease with rise in temperature
3. will remain same
4.depends upon altitude of experimentation
Specific resistance of a wire
1. will depend on its length
2.will depend on its radius
3.will depend on the type of material of the wire
4.None
The current in the circuit shown in figure - What will be the current in the circuit?
1.1/45A
2.1/10A
3.1/5A
4.5A
The current through a metallic conductor is due to the motion of
1.free electrons
2.protons
3.neutrons
4.still under controversy
The graphical representation of Ohms law is
1.hyperbola
2.ellipse
3.parabola
4.straight line
Thermocouples convert
1.heat energy into electrical energy
2.heat energy into light energy
3.heat energy into mechanical energy
4.mechanical energy into heat energy
When 2? 4? and 6? resistor are connected in parallel their resultant equivalent resistance will be
1.12?
2.11/12?
3.12/11?
4.data is insufficient
When same current passes for same time through a thick and thin wire
1.more heat is produced in thick wire
2.more heat is produced in thin wire
3.no heat is produced in wire
4.less heat is produced in thick wire
A fuse is placed in series with the cireuit to protect against
1.high power
2.high voltage
3.high current
4.over heating
An electric iron is marked 20 volts 500W. The units consumed by it in using if for 24 hours will be
1.12
2.24
3.5
4.1100
Circuit which gives continuously varying potential is called
1.complex network
2.wheat stone bridge
3. potential divider
4.all of above
Electrical energy is converted to heat at the rate of
1.IRt
2.I2R
3.I2Rt
4.Vit
In the following figure the terminal potential is
1.zero
2.2V
3.12V
4.36V
Resistance of a conductor depends upon
1.nature of conductor
2.dimension of conductor
3.physical state of the conductor
4.all of above
Resistance of an ideal insulator is
1.infinite
2.zero
3.finite
4.depends upon nature
The resistance of a conductor at absolute zero (OK) is
1.zero almost
2. infinite almost
3.no prediction at all
4.may increase or decrease
There are three bulbs of 60W 100W and 200W which bulb has thickest filament.
1.100W
2.200W
3.60W
4.all
Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f?A. B. 90WC. 100W D. 120W
1.40 W
2.90
3.100
4.120
Which one is the best material for making connecting wires?
1.iron
2.tungsten
3.silver
4.copper
Which one of the following bulbs has the least resistance?
1.100 watt
2.200 watt
3.300 watt
4.60 watt
Why should a resistance be introduced in a circuit in series deliberately?
1. to increase current
2.to decrease current
3.to control current
4.just to give a good look to circuit