# ECAT/ECAT Physics Electromagnetism MCQs Sample Test,Sample questions

## Question: ``` Galvanometer is a very sensitive device with ```

1.very low damping

2. very high damping

3.no damping at all

## Question: ``` Galvanometer is a very sensitive device with ```

1.very low damping

2. very high damping

3.no damping at all

## Question: ``` Heating a magnet will ```

1.weaken it

2. strengthen it

3. reverse its polarity

4.demagnetize it completely

## Question: ``` Heating a magnet will ```

1.weaken it

2. strengthen it

3. reverse its polarity

4.demagnetize it completely

1.? = NIAB cos?

2.? = NIAB sin?

3.? = NIAB tan?

4.? = NIAB

1.? = NIAB cos?

2.? = NIAB sin?

3.? = NIAB tan?

4.? = NIAB

## Question: ``` Magnetic flux and flux density are related by ```

1.magnetic flux = flux density / area

2.magnetic flux = flux density x area

3.flux density = magnetic flux area

4.flux density = magnetic flux x area

## Question: ``` Magnetic flux and flux density are related by ```

1.magnetic flux = flux density / area

2.magnetic flux = flux density x area

3.flux density = magnetic flux area

4.flux density = magnetic flux x area

## Question: ``` Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is ```

1.0.1 A

2.1:00 AM

3. current sensitivity

4.1 m A

## Question: ``` Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is ```

1.0.1 A

2.1:00 AM

3. current sensitivity

4.1 m A

1.a circle

2.a spiral

3.an ellipse

4.helix

1.a circle

2.a spiral

3.an ellipse

4.helix

1.18?

2.30?

3.24?

4.12?

1.18?

2.30?

3.24?

4.12?

## Question: ``` The effective way to increase the sensitivity of a moving coil galvanometer is to ```

1. use a very long and fine suspension

2.use a coil of very large area

3. use a coil with very large number of turns

4.use a very strong magnetic field

## Question: ``` The effective way to increase the sensitivity of a moving coil galvanometer is to ```

1. use a very long and fine suspension

2.use a coil of very large area

3. use a coil with very large number of turns

4.use a very strong magnetic field

## Question: ``` The magnetic field strength of solenoid is ```

1.B = ??NI

2.B = ??N/I

3.B = ??nI

4. both (b) and C

## Question: ``` The magnetic field strength of solenoid is ```

1.B = ??NI

2.B = ??N/I

3.B = ??nI

4. both (b) and C

1.1T = 103 G

2.1T = 10-4 G

3.1T = 10-2 G

4.1T = 104 G

1.1T = 103 G

2.1T = 10-4 G

3.1T = 10-2 G

4.1T = 104 G

1.C/BAN

2.CAN/B

3.BAN/C

4.ABC/N

1.C/BAN

2.CAN/B

3.BAN/C

4.ABC/N

1.air

2.steel

3.Cu-Ni alloy

4.soft iron

1.air

2.steel

3.Cu-Ni alloy

4.soft iron

## Question: ``` A magnetic field ```

1. always exerts a force on a charged particle

2.never exerts a force on a charged particles

3.exerts a force if the charged particle is moving in the direction of the magnetic field lines

4. exerts a force if the charged particle is moving perpendicular to the magnetic field lines

## Question: ``` A magnetic field ```

1. always exerts a force on a charged particle

2.never exerts a force on a charged particles

3.exerts a force if the charged particle is moving in the direction of the magnetic field lines

4. exerts a force if the charged particle is moving perpendicular to the magnetic field lines

## Question: ``` A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is ```

1. independent mass m

2.directly proportional to m

3. directly proportional to q

4.directly proportional to B

## Question: ``` A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is ```

1. independent mass m

2.directly proportional to m

3. directly proportional to q

4.directly proportional to B

## Question: ``` An ammeter measures the total current flowing through a circuit when it is connected ```

1.in series with the circuit

2.in parallel with circuit

3.in series with any of the parallel resistances in the circuit

4. in parallel with any of the series resistances in the circuit

## Question: ``` An ammeter measures the total current flowing through a circuit when it is connected ```

1.in series with the circuit

2.in parallel with circuit

3.in series with any of the parallel resistances in the circuit

4. in parallel with any of the series resistances in the circuit

## Question: ``` In a multi range ammeter as the range increases ```

1.shunt value decreases

2.shunt value increases

3.shunt value remains the same

4.none of the above

## Question: ``` In a multi range ammeter as the range increases ```

1.shunt value decreases

2.shunt value increases

3.shunt value remains the same

4.none of the above

## Question: ``` Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called ```

1.magnetic flux

2.magnetic field intensity

3.magnetic induction

4.self inductance

## Question: ``` Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called ```

1.magnetic flux

2.magnetic field intensity

3.magnetic induction

4.self inductance

## Question: ``` The magnetic force experienced by a charge particle moving in a magnetic field will be minimum when it moves ```

1. perpendicular to the field

2.parallel to the field

3. inclined parallel to the field

4.at an angle of 45?

## Question: ``` The magnetic force experienced by a charge particle moving in a magnetic field will be minimum when it moves ```

1. perpendicular to the field

2.parallel to the field

3. inclined parallel to the field

4.at an angle of 45?

1.M

2.L

3.H

4.B

1.M

2.L

3.H

4.B

## Question: ``` Two parallel wires carrying currents in the opposite directions ```

1.repel each other

2.attract each other

3.have no effect upon each other

4. they cancel out their individual magnetic fields

## Question: ``` Two parallel wires carrying currents in the opposite directions ```

1.repel each other

2.attract each other

3.have no effect upon each other

4. they cancel out their individual magnetic fields

## Question: ``` Value of permeability of tree space in SI units is ```

1.4?x10-9 WbA-1m-1

2.4?x10-7 WbA-1m-1

3.4?x10-10 WbA-1m-1

4.4?x10-8 WbA-1m-1

## Question: ``` Value of permeability of tree space in SI units is ```

1.4?x10-9 WbA-1m-1

2.4?x10-7 WbA-1m-1

3.4?x10-10 WbA-1m-1

4.4?x10-8 WbA-1m-1

## Question: ``` When the coil of the galvanometer is in equilibrium then the deflecting couple is ```

1.zero

2. equal to the restoring couple

3.greater than the restoring couple

4.smaller than the restoring couple

## Question: ``` When the coil of the galvanometer is in equilibrium then the deflecting couple is ```

1.zero

2. equal to the restoring couple

3.greater than the restoring couple

4.smaller than the restoring couple

## Question: ``` Which one of the following is not an electromechanical instrument? ```

1.galvanometer

2.voltmeter

3.ammeter

4. AC transformer and DC generator

## Question: ``` Which one of the following is not an electromechanical instrument? ```

1.galvanometer

2.voltmeter

3.ammeter

4. AC transformer and DC generator

1.F=1/B

2.F=1/Bsin?

3. F/0

4.F=1/Bcos?

1.F=1/B

2.F=1/Bsin?

3. F/0

4.F=1/Bcos?

## Question: ```A galvanometer basically is an instrument used to ```

1.detect current in a circuit

2.measure current flowing through a circuit

3. measure voltage across a circuit

4.measure potential difference between two points in a circuit

## Question: ```A galvanometer basically is an instrument used to ```

1.detect current in a circuit

2.measure current flowing through a circuit

3. measure voltage across a circuit

4.measure potential difference between two points in a circuit

## Question: ```A magnetic compass will be deflected if it is kept near a ```

1.charge in motion

2.charge at rest

3.both

4.none

## Question: ```A magnetic compass will be deflected if it is kept near a ```

1.charge in motion

2.charge at rest

3.both

4.none

1.4 volt

2. 5 volt

3.2 volt

4.0.4 volt

1.4 volt

2. 5 volt

3.2 volt

4.0.4 volt

1.2.0 mA

2.20 mA

3.200 mA

4. 0.2 mA

1.2.0 mA

2.20 mA

3.200 mA

4. 0.2 mA

## Question: ```A wheat stone bridge is said to be balanced when ```

1.maximum current flows through the galvanometer branch

2.minimum current flows through the galvanometer branch

3.potential difference across galvanometer branch is maximum

4.potential difference across galvanometer branch is zero

## Question: ```A wheat stone bridge is said to be balanced when ```

1.maximum current flows through the galvanometer branch

2.minimum current flows through the galvanometer branch

3.potential difference across galvanometer branch is maximum

4.potential difference across galvanometer branch is zero

1.E = BeV

2.B = eE/V

3.E = BV

4.E = BeV/2

1.E = BeV

2.B = eE/V

3.E = BV

4.E = BeV/2

## Question: ```An instrument which can measure potential without drawing any current is ```

1.voltmeter

2.galvanometer

3.cathode ray oscilloscope (CRO)

4.ammeter

## Question: ```An instrument which can measure potential without drawing any current is ```

1.voltmeter

2.galvanometer

3.cathode ray oscilloscope (CRO)

4.ammeter

1.BINA cosa

2. BINA sina

3. BINA tana

4.BINA

1.BINA cosa

2. BINA sina

3. BINA tana

4.BINA

## Question: ```If a current carrying solenoid is suspended freely it will ```

1.be rotating

2.come to rest in N-S direction

3.vibrating like galvanometer needle

4.comes to rest after rotation

## Question: ```If a current carrying solenoid is suspended freely it will ```

1.be rotating

2.come to rest in N-S direction

3.vibrating like galvanometer needle

4.comes to rest after rotation

1.1A

2.10A

3.100A

4.1000A

1.1A

2.10A

3.100A

4.1000A

1.R=qB/mV

2.R=mV/qB

3.R=qmV/B

4.R=qmB/V

1.R=qB/mV

2.R=mV/qB

3.R=qmV/B

4.R=qmB/V

## Question: ```When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ```

1. a straight line parallel to the field

2.a parabola in a plane perpendicular to the field

3.a circle in a plane perpendicular to the field

4.a straight line along its initial direction

## Question: ```When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ```

1. a straight line parallel to the field

2.a parabola in a plane perpendicular to the field

3.a circle in a plane perpendicular to the field

4.a straight line along its initial direction

## Question: ```Which one of the following methods would be able to increase the sensitivity of a moving coil galvanometer ? ```

1.connect a shunt across the coil

2.use a coil of smaller cross sectional area

3.use a coil having less number of turns

4.use spiral springs whose force constant is small

## Question: ```Which one of the following methods would be able to increase the sensitivity of a moving coil galvanometer ? ```

1.connect a shunt across the coil

2.use a coil of smaller cross sectional area

3.use a coil having less number of turns

4.use spiral springs whose force constant is small

## Question: ```While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when ```

1.a most sensitive galvanometer is used

2. a steady voltage cell is used

3.the balance point is close to the middle of the wire

4.a high resistance box is used in one of its gap

## Question: ```While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when ```

1.a most sensitive galvanometer is used

2. a steady voltage cell is used

3.the balance point is close to the middle of the wire

4.a high resistance box is used in one of its gap

## More MCQS

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