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Dear Students!Following is the collection of all TN State Board Exam Questions (for Plus Two Physics) that appeared from March 2006 to September 2014. Answers for the MCQs and Problems will be uploaded soon. Pl note that the formatting may not be upto the mark in this file; the same can be viewed in the pdf file uploaded in the same name as this file.
PLUS TWO PHYSICS TN STATE BOARD EXAM QUESTIONS UNIT 3 EFFECTS OF ELECTRIC CURRENT
MAR – 2006 UP TO SEP – 2014
PART – I
The unit of reduction factor of tangent galvanometer is M06
a] no unit b] tesla c] ampere d] ampere / degree.
A galvanometer is converted into a voltmeter by connecting a M06
a] low resistance in series b] high resistance in parallel
c] high resistance in series d] low resistance in parallel.
Nichrome is used as heating element because it has J06, J08, S12, M14
a] very low resistance b] low melting point
c] high specific resistance d] high conductivity.
Of the following devices, which has small resistance? J06, J12, M09n
a] Voltmeter b] Ammeter of range 0 – 10 A
c] Moving coil galvanometer d] Ammeter of range 0 – 1 A.
In a thermocouple, the temperature of the cold junction is 20 o C, the inversion temperature is 600 o C. Then the neutral temperature is S06
a] 310 o C b] 320 o C c] 300 o C d] 315 o C.
In a tangent galvanometer, a current of 1 A produces a deflection of 30 o. The current required to produce a deflection of 60 o is S06
a] 3 A b] 2 A c] √ 3 A d] 1 / √ 3 A.
Peltier effect is the converse of _________ effect. M07
a] Joule b] Raman c] Thomson d] Seebeck.
Torque experienced by a rectangular current loop placed perpendicular to a uniform magnetic field is
a] maximum b] zero c] finite, minimum d] infinity M07
In a tangent galvanometer, for a constant current, the deflection is 30 o. The plane of the coil is rotated through 90 0. Now, for the same current, the deflection will be J07, S13
a] 30 o b] 60 o c] 90 o d] 0 o
In which of the following pairs of metals of a thermocouple is the emf maximum? J07
a] Fe-Cu b] Cu-Zn c] Pt-Ag d] Sb-Bi
Which of the following principles is used in a thermopile? M06
a] Thomson effect b] Peltier effect c] Seebeck effect d] Joule effect
An ideal voltmeter has S07, J10, J11, S14
a] zero resistance b] finite resistance less than G but greater than zero
c] infinite resistance d] resistance greater than G but less than infinity
Joule’s law of heating is M08
a] H = V 2Rt b] H = IR2t c] I^2/R t d] H = VIt
Fuse wire is an alloy of M08
a] lead and tin b] tin and copper c] lead and copper d] lead and iron
In a thermocouple, the temperature of the cold junction is 20 o C, the neutral temperature is 270 o C. Then the temperature of inversion is J08, S08, M10, J14
a] 520 0 C b] 540 0 C c] 500 0 C d] 510 0 C
Thermopile is used to S08
a] measure temperature b] measure current
c] detect thermal radiation d] measure pressure
The resistance of the filament of a 110 W, 220 V electric bulb is M09
a] 440 Ω b] 220 Ω c] 484 Ω d] 848 Ω
Peltier coefficient at a junction of a thermocouple depends on J09, S10, J12
a] current in the thermocouple b] time for which currents flows
c] temperature of the junction d] charge that passes through it
The magnitude and direction of the magnetic Lorentz force is given by J09
a] F ̅ = [(v ) ̅ x B ̅ ] b] F ̅ = q / [(v ) ̅ x B ̅ ]
c] F ̅ = q [(v ) ̅ x B ̅ ] d] F ̅ = v [(q ) ̅ x B ̅ ]
Phosphor-bronze wire is used for suspension in moving-coil galvanometer because it has S09, S13
a] high conductivity b] high resistivity
c] large couple per unit twist d] small couple per unit twist
Unit of Peltier coefficient is S09
a] ohm b] mho c] volt d] ampere
Which of the following equations represent Biot-Savart law? M10
a] dB = ( µ_0)/(4 π) (I dl)/r^( 2) b] (dB) ⃗ = ( µ_0)/(4 π) (I dl sinθ)/r^( 2)
c] (dB) ⃗= ( µ_0)/(4 π) (I (dl) ⃗ x r ⃗)/r^( 2) d] (dB) ⃗= ( µ_0)/(4 π) (I (dl) ⃗ x r ⃗)/r^( 3)
For a given thermocouple the neutral temperature J10
a] depends on the temperature of cold junction
b] depends on the temp. of hot junction
c] is a constant
d] depends on the temp. of cold junction and the temp. of hot junction.
When the number of turns (n) in a galvanometer is doubled, current sensitivity S10
a] remains constant b] decreases twice
c] increases twice d] increases four times.
An electron is moving with a velocity of 3 x 10 6 m s – 1 perpendicular to a uniform magnetic field of induction 0.5 T. The force experienced by the electron is M11
a] 2.4 x 10 – 13 N b] 13.6 x 10 – 27 N c] 13.6 x 10 – 11 N d] zero.
The period of revolution of a charged particle inside a cyclotron does not depend on the M11, M13
a] magnetic induction b] charge of the particle
c] velocity of the particle d] mass of the particle.
Magnetic induction due to an infinitely long straight conductor placed in a medium of permeability μ is
J11
a] (µ_0 I)/(4πa ) b] (µ_0 I)/(2πa ) c] (µI)/(4πa ) d] (µI)/(2πa ) .
Fuse wire S11
a] is an alloy of lead and copper b] has low resistance
c] has high resistance d] has high melting point.
In a thermocouple, the temperature of the cold junction is - 30 o C, the neutral temperature is 270 o C. Then the temperature of inversion is S11
a] 520 0 C b] 540 0 C c] 500 0 C d] 570 0 C .
In the experiment to verify Joule’s law when the current passed through the circuit is doubled keeping resistance (R) and time of passage of current (t) constant, temperature of the liquid S12
a] increases twice b] increases four times
c] increases sixteen times d] decreases four times.
The direction of force on a current carrying conductor placed in a magnetic field is given by: M13
a] Fleming’s left hand rule b] Fleming’s right hand rule
c] End rule d] Right hand palm rule.
AB is a rod of lead. The end A is heated. A current I is allowed to flow along AB. Now, due to Thomson effect, in rod AB: J13
a] heat is absorbed b] heat is liberated
c] heat is neither absorbed nor liberated d] heat is first absorbed and then liberated.
Consider a circular coil of radius 10 cm in an air medium. If 5 A current passes through it, what would be the magnetic induction at its centre? M14
a] π x 〖10〗^(―5) T b] π x 〖10〗^5 T c] π x 〖10〗^(―15) T d] π x 〖10〗^(―6) T.
Fuse wire is an alloy of J14
a] lead and tin b] lead and copper c] aluminium and tin d] lead and aluminium.
The torque on a rectangular loop placed in a uniform magnetic field is large when the: S14
a] number of turns is large b] number of turns is less
c] plane of the coil is perpendicular to the field d] area of the coil is small.
PLUS TWO PHYSICS TN STATE BOARD EXAM QUESTIONS UNIT 3 EFFECTS OF ELECTRIC CURRENT
PART – II THREE – MARK QUESTIONS
Mention any two differences between Peltier effect and Joule heating effect. M06
Define Peltier coefficient and give its unit. J06, J11, M12, M14
Mention the limitations of cyclotron. S06, J10, M13
In a galvanometer, increasing the current sensitivity does not necessarily increase the voltage sensitivity. Explain. M07, J13
Why is nichrome used as a heating element? J07
Calculate the resistance of the filament of a 100 W, 220 V electric bulb. S07
Define ampere in terms of force between two long parallel current-carrying conductors. M08, J08, S11, S14
What is neutral temperature of a thermocouple? S08
State (What is) Ampere’s circuital law. M09, (J14)
How is a galvanometer converted into [a] an ammeter [b] a voltmeter. J09
How can we increase the current sensitivity of a galvanometer? S09
What are the characteristics of heating element used in electric heating device? M10
State Fleming’s left hand rule. S10
State tangent law. M 11
A long straight wire carrying current produces a magnetic induction of 4 × 10 – 6 T at a point, 15 cm from the wire. Calculate the current through the wire. J12
Define Thomson coefficient. S12
A conductor of length 50 cm carrying a current of 5 A is placed perpendicular to a magnetic field of induction 2 x 10 ―3 T. Find the force on the conductor.
PLUS TWO PHYSICS TN STATE BOARD EXAM QUESTIONS UNIT 3 EFFECTS OF ELECTRIC CURRENT
PART – III FIVE – MARK QUESTIONS
A circular coil of radius 20 cm has 100 turns wire and it carries a current of 5A. Find the magnetic induction at a point along its axis at a distance of 20 cm from the centre of the coil. M06, S06, M09
A rectangular coil of 500 turns and of area 6 × 10 –4 m 2 is suspended inside a radial magnetic field of induction 10 – 4 T by a suspension wire of torsional constant 5 × 10 –10 Nm per degree. calculate the current required to produce a deflection of 10o. J06, M13 (Cmplsry)
An MCG of resistance 20 Ω produces full scale deflection for a current of 50 mA. How you will convert the galvanometer into (i) an ammeter of range 20 A and (ii) a voltmeter of range 120 V. M07, J13
What are the special features of magnetic Lorentz force? J07, M 11
A long straight wire carrying current produces a magnetic induction of 4 × 10 –6 T at a point, 15 cm from the wire. Calculate the current through the wire. S07
Explain the conversion of galvanometer into an ammeter. M08, M10, J12, S13
In a hydrogen atom electron moves in an orbit of radius 0.5 Å making 10 16 rev. per second. Determine the magnetic moment associated with orbital motion of the electron. J08
Explain in detail, the principle and construction of a tangent galvanometer. [ Diagram and theory not necessary ] S08
A moving coil galvo of resistance 20 Ω produces full scale deflection for a current of 50 mA. How you will convert the galvanometer into (i) an ammeter of range 20 A and (ii) a voltmeter of range 120 V. [ OR ]
A circular coil of radius 20 cm has 100 turns wire and it carries a current of 5A. Find the magnetic induction at a point along its axis at a distance of 20 cm from the centre of the coil. M09
State and explain Biot-Savart law. J09
Two parallel wires each of length 5m are placed at a distance of 10 cm apart in air. They carry equal currents along the same direction and experience a mutually attractive force of 3.6 × 10 –4 N. Find the current through the conductors. [ OR ]
A rectangular coil of 500 turns and of area 6 × 10 –4 m 2 is suspended inside a radial magnetic field of induction 10 –4 T by a suspension wire of torsional constant 5 × 10 –10 Nm per degree. Calculate the current required to produce a deflection of 100. S09 (cmplsry)
Two parallel wires each of length 5m are placed at a distance of 10 cm apart in air. They carry equal currents along the same direction and experience a mutually attractive force of 3.6 × 10 –4 N. Find the current through the conductors. J10, M13 (Cmplsry)
A galvanometer has a resistance of 40 Ω. It shows full scale deflection for a current of 2 mA. How you will convert the galvanometer into a voltmeter of range 0 to 20V? S10
Explain the conversion of galvanometer into a voltmeter. J11, M12
Two straight inf. long parallel wires carrying equal currents placed at a distance of 20 cm apart experience a mutually attractive force of 4.9 x 10 – 5 N per unit length of the wire. Calculate the current. S11
The deflection of a galvanometer falls from 50 divisions to 10 divisions when 12 Ω resistance is connected across the galvanometer. Calculate the galvanometer resistance. S12
A current of 4 A flows through a 5-turn coil of a tangent galvanometer having a diameter of 30 cm. If the horizontal component of the Earth’s magnetic induction is 4 x 〖10〗^(―5) T, find the deflection produced in the coil. M14
In a tangent galvanometer, a current of 1 A produces a deflection of 〖30〗^0. Find the current required to produce a deflection of 〖60〗^0. S14
A rectangular coil of area 20 cm × 10 cm with 100 turns of wire is suspended in a radial magnetic field of induction 5 × 10─3 T. If the galvanometer shows an angular deflection of 150 for a current of 1mA, find the torsional constant of the suspension wire. J14
PART – IV TEN – MARK QUESTIONS
Applying Biot-Savart law, obtain an expression for the magnetic induction at a point due to an infinitely long straight conductor carrying current. (Write the expression for the magnetic induction when the conductor is placed in a medium of permeability µ). M06, J06, S09, M10, S13
Define Ampere’s circuital law. Applying it, find the magnetic induction due to a long solenoid carrying current. S06, J09
Explain in detail the principle, construction, working and limitations of a cyclotron.
M07, S10, S11, J13
State Joule’s law. Explain Joule’s calorimeter experiment to verify the Joule’s laws of heating. J07, J12
Deduce the relation for the magnetic induction at a point along the axis of a circular coil carrying current. S07, M08, M12, S14
Explain in detail the principle, construction and theory of a tangent galvanometer. J08
Deduce an expression for the force on a current-carrying conductor placed in a magnetic field. Find the magnitude of the force (and direction of force). S08, M09, J11, S12, M14
Discuss the motion of a charged particle in a uniform magnetic field. (and derive an expression for its time period) J10, M13, (J14)
Obtain an expression for the force between two long parallel, current-carrying conductors. Hence define ampere. M11
PLUS TWO PHYSICS TN STATE BOARD EXAM QUESTIONS UNIT 3 EFFECTS OF ELECTRIC CURRENT
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