# MCAT/MCAT Physics Mcq Questions Alterting current Sample Test,Sample questions

1.32?

2.62?

3.50?

4.100?

1.0.9sec

2.15 sec

3.1.5x105sec

4.0.9x102sec

## Question: `A changing magnetic flux produces around itself an induced`

1.Magnetic field

2.Electric field

3.Electromagnetic force

4.Artificial gravitational field

1.high power

2.high voltage

3.high current

4.over heating

1.0.0004?

2.0.06?

3.0.10?

4.0.13?

## Question: `A pure variable resistor is connected in series with a pure capacitor of fixed capacitance. The impedance of the circuit`

1.Remains

2.Becomes infinite

3.Becomes zero

4.Increases

1.(R+2?fL)

2.R+1/2?fL

3.(R2+f2L2)

4.(R2+4?2f2L2)

## Question: `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

## Question: `Ammeter connected in an AC circuit measures`

1.Exact value of current

2.rms value of current

3.Net value of current

4.Peak value of current

## Question: `An alternating current is represented by the equation I = I?sin?t which of the following equation represents an alternating current of frequency and amplitude twice that of the above current?`

1.I = 2I?Sin(?t/2)

2.I = 2I?Sin(2?t)

3.I = 2ISin?t

4.I = I?sin(2?t)

1.20A

2.20.66A

3.6.66A

4.5.66A

## Question: `An alternating current or voltage`

1.fluctuates off and on

2.varies in magnitude alone

3.changes its direction again and again

4.changes its magnitude harmonically and reverses its direction of flow after regularly recurring intervals.

1.12

2.24

3.5

4.1100

## Question: `An electromagnetic wave consists of`

1.Electric and magnetic fields moving parallel to each other

2.Magnetic field moving with velocity of light in space

3.Electric field moving with velocity of light

4.Electric and magnetic fields moving perpendicular to each other

1.2KWh

2.20KWh

3.6KWh

4.12KWh

## Question: `Circuit which gives continuously varying potential is called`

1.complex network

2.wheat stone bridge

3.potential divider

4.all of above

1.IRt

2.I2R

3.I2Rt

4.VIt

1.watt

2.horse power

3.kilo watt

4.kilowatt hour

1.Stationary

2.Longitudinal

3.Transverse

4.All the above

1.Energy

2.Momentum

3.Mass

4.Heat

## Question: `Electromagnetic waves travel in free space with the speed of`

1.?-rays

2.Positive rays

3.Cathode rays

4.More than sound waves

1.3600C

2.7200C

3.1C

4.2C

## Question: `If a glass plate is inserted in between the plate of a capacitor in series with a lighted bulb the brightness of the bulb`

1.Remains same

2.Brightness increases

3.Brightness decreases

4.No light

1.Twice

2.One half

3.Four times

4.None

## Question: `In capacitive circuit the current`

1.Lags behind voltage by ?/2

2.Is in phase with voltage

3.Opposite in phase of voltage by ?

4.Leads forward the voltage by ?/2

## Question: `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

1.zero

2.2V

3.12V

4.36V

## Question: `Internal resistance is the resistance offered by`

1.source of e m f

2.conductor

3.resistor

4.capacitor

## Question: `pure resistor circuit the voltage and current are`

1.Lagging each other

2.They are at 90? phase difference

3.They have zero phase difference

4.No phase difference

1.resistance

2.inductance

3.conductivity

4.flexibility

1.4?

2.6?

3.10?

4.8?

## Question: `Resistance of a super conductor is`

1.finite

2.infinite

3.zero

4.changes with every conductor

## Question: `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

## Question: `Resistance of an ideal insulator is`

1.infinite

2.zero

3.finite

4.depends upon nature

## Question: `Specific resistance of a wire`

1.will depend on its length

3.will depend on the type of material of the wire

4.will depend on none of the above

## Question: `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

1.1/45A

2.1/10A

3.1/5A

4.5A

## Question: `The direction of propagation of an electromagnetic waves is`

1.Perpendicular to electric field

2.Perpendicular to both electric and magnetic field

3.Perpendicular to magnetic field

4.Parallel to electric and magnetic field

1.hyperbola

2.ellipse

3.parabola

4.straight line

## Question: `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

## Question: `The value of the steady current which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current is`

1.Average current

2.Sinusoidal current

3.r.m.s current

4.Net current

1.100W

2.200W

3.60W

4.all

## Question: `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

## Question: `To find the r.m.s value of an alternating current mathematically we need to have`

1.Mean value of I2

2.Square root of mean value of I2

3.Square root of I2

4.Square of 1/2

## Question: `Waves emitted from the antenna are`

1.Sound waves

2.Electromagnetic waves

4.Modulated waves

## Question: `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

1.iron

2.tungsten

3.silver

4.copper

1.100 watt

2.200 watt

3.300 watt

4.60 watt

1.constantan

2.nichrome

3.copper

4.tungsten

## Question: `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

## More MCQS

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