- when a current carrying conductor is placed magnetic field the force on conductor will be?
zero when length vector and field are parallel
half of maximum when length vector and field are at 30 degree
force will be perpendicular to the plane formed by length and field vector
all of these - Tesla is equivalent to:?
Nm per A
N per m per A
Wb per m sq
both b and c
3.If magnetic field is doubled then magnetic energy density becomes:?
doubled
halved
9 times
none of these
- The brightness of spot on CRO screen is controlled by:?
filament
cathode
anode
none of these - To convert a galvanometer into a voltmeter, a high resistance is connected in:?
in series
parallel
may be both in series or parallel
none of these - if Rg=50ohm Ig=2mA find the approximate value of resistance by which galvanometer can be converted into voltmeter of range 200 V?
1000 ohm
10000ohm
1Mohm
0.1Mohm - if Rg=15ohm Ig=20mA and ammeter of range 10A find the approximate value of resistance by which galvanometer can be converted into ammeter of range 10A?
0.003ohm
0.03ohm
0.3ohm
none of these - A wire 10m high from the ground carries a current 200A find the magnetic field strength at the ground?
3 microT
4 microT
3 mT
4 mT - Two wires carrying current in same direction will?
attract each other
will repel each other - Two loops carrying current in same direction will?
repel each other
will attract each other - The torque on a current carrying coil will be maximum when plane of the coil will be?
perpendicular to the field lines
parallel to the field lines - by the decreasing length and increasing the diameter of suspension wire of galvanometer sensitivity will?
increase
decrease
remains same
none of these - In e.m induction if the resistance of the loop is increased then induced emf will be?
decreased
increased
remains same
none of these - if rod moves towards and magnetic field will be pointed out of the paper then direction of flow of induced current will be?
clockwise in the loop
anticlockwise
no current will flow - A copper falling through a region where field is out of the paper then direction of current while entering and existing the field region will be?
anticlockwise, clockwise
clockwise, anticlockwise
no current will flow while entering of existing - Lenz law is in accordance with law of conservation of?
charge
mass
energy
none - if current is flowing clockwise in primary coil then current will flow in secondary coil will be?
clockwise
anticlockwise
none of these - The ratio of emf induced in coil to the time rate of change in current in same coil is called?
Mutual inductance
Self induction
Electromagnet
None - if current in the coil is decreased then induced emf will?
Oppose and decrease the applied emf
Will aid the applied emf and will try to increase current
None
May be both - As resistance behave in A.C Circuits Inductor Behaves in D.C circuits. Is this statement is?
Correct
Incorrect - When the plane of coil will be perpendicular to field the induced emf in the coil of generatro will be?
Zero
Maximum
May be both
None - If the output of A.C is connected to a motor having split rings then motor will?
Rotate smoothly
Reversed after half cycle
Will not rotate - A generator coil is acted upon by how many torques?
Question grade : 1
23/30
Three
Two
One
None
- If 24 volts are applied to motor and back emf induces is 22.5 volts then at normal speed what will the current in coil when resistance of coil is 2 ohms?
Question grade : 1
24/30
12 A
0.75A
1.5A
None
- If main supply is 240V and we have to operate 12V, 30W lamp , what will be the transformation ratio?
Question grade : 1
25/30
1/25
1/20
1/10
None
- If core material is of large hysteresis loop then power loss will?
Question grade : 1
26/30
Decreased
Increased
No effect
- Velocity selector uses …. To separate charge particle of certain velocity by?
Question grade : 1
27/30
Electrostatic force
Magnetic force
Lorentz force
None of these
- When a rod is moving in a magnetic field such that velocity and field are at right angle to each others how many forces are acting on the rod?
Question grade : 1
28/30
2
3
4
1
- The contribution of horizontal portion of coil in total torque is zero because?
Question grade : 1
29/30
Force on these side is parallel to moment arm
No force is acted on these sides
Force is along the conductor
None of these
- To convert a galvanomter into a ohmmeter we need?
Question grade : 1
30/30
A cell
Cell and large resistance
Cell and adjustable resistance
None of these
- when a current carrying conductor is placed magnetic field the force on conductor will be all of these Missed
- Tesla is equivalent to: both b and c Missed
3.If magnetic field is doubled then magnetic energy density becomes: none of these Missed - The brightness of spot on CRO screen is controlled by: none of these Missed
- To convert a galvanometer into a voltmeter, a high resistance is connected in: in series Missed
- if Rg=50ohm Ig=2mA find the approximate value of resistance by which galvanometer can be converted into voltmeter of range 200 V 0.1Mohm Missed
- if Rg=15ohm Ig=20mA and ammeter of range 10A find the approximate value of resistance by which galvanometer can be converted into ammeter of range 10A 0.03ohm Missed
- A wire 10m high from the ground carries a current 200A find the magnetic field strength at the ground 4 microT Missed
- Two wires carrying current in same direction will will repel each other Missed
- Two loops carrying current in same direction will will attract each other Missed
- The torque on a current carrying coil will be maximum when plane of the coil will be parallel to the field lines Missed
- by the decreasing length and increasing the diameter of suspension wire of galvanometer sensitivity will decrease Missed
- In e.m induction if the resistance of the loop is increased then induced emf will be remains same Missed
- if rod moves towards and magnetic field will be pointed out of the paper then direction of flow of induced current will be anticlockwise Missed
- A copper falling through a region where field is out of the paper then direction of current while entering and existing the field region will be clockwise, anticlockwise Missed
- Lenz law is in accordance with law of conservation of energy Missed
- if current is flowing clockwise in primary coil then current will flow in secondary coil will be anticlockwise Missed
- The ratio of emf induced in coil to the time rate of change in current in same coil is called None Missed
- if current in the coil is decreased then induced emf will Will aid the applied emf and will try to increase current Missed
- As resistance behave in A.C Circuits Inductor Behaves in D.C circuits. Is this statement is Incorrect Missed
- When the plane of coil will be perpendicular to field the induced emf in the coil of generatro will be Zero Missed
- If the output of A.C is connected to a motor having split rings then motor will Rotate smoothly Missed
- A generator coil is acted upon by how many torques Two Missed
- If 24 volts are applied to motor and back emf induces is 22.5 volts then at normal speed what will the current in coil when resistance of coil is 2 ohms 0.75A Missed
- If main supply is 240V and we have to operate 12V, 30W lamp , what will be the transformation ratio 1/20 Missed
- If core material is of large hysteresis loop then power loss will Increased Missed
- Velocity selector uses …. To separate charge particle of certain velocity by Lorentz force Missed
- When a rod is moving in a magnetic field such that velocity and field are at right angle to each others how many forces are acting on the rod 4 Missed
- The contribution of horizontal portion of coil in total torque is zero because No force is acted on these sides Missed
- To convert a galvanomter into a ohmmeter we need Cell and adjustable resistance Missed
