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CLASS -12 PHYSICS Topics : Magnetic Dipole Moment of a revolving electron (Bohr Magneton), Moving coil galvanometer, Conversion of Galvanometer to Ammeter, Conversion of Galvanometer to Voltmeter Class held on 14/08/2020.

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NAME OF STUDENT & Roll No. *

To Download Deleted Syllabus of All subject Click this link : https://myedudel.blogspot.com/2020/08/deleted-syllabus-xii-class-2020-21.html

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NAME OF TEACHER *

1. The ratio of magnetic moment and orbital angular momentum of revolving electron is known as *

1 分

Bohr's magneton

Gyromagnetic ratio

Magnetic Dipole moment ratio

None of the above

2. Bohr's magneton (M) *

1 分

M = 4πm / eh

M = 4eh/πm

M = eh/4πm

M = eh/2πm

3. The sensitivity of Moving Coil Galvanometer can be increased by decreasing *

1 分

No. of turns of the coil

Magnetic field

Area of the coil

Restoring couple per unit twist of the suspension

4. A galvanometer of 50 Ω gives full scale deflection with 2mA current. To convert it into ammeter, the range of 10 A is connected with it, the shunt resistance should be *

2 分

0.02 Ω

0.2 Ω

0.01 Ω

0.1 Ω

5. A Moving Coil Galvanometer has a coil of effective area A and no. of turns N. The magnetic field B is radial. If a current I is passed through the coil the torque acting on the coil is *

1 分

NA²B²I

NIAB Sinα

NABI

Zero

6. In an ammeter 10% of main current is passing through the galvanometer. If the resistance of the galvanometer is G, then the shunt resistance - *

1 分

G/9

90G

G/90

7. A galvanometer of resistance 25Ω is shunted by a 2.5 Ω wire. The part of total current that flows through the galvanometer is *

2 分

I/I₀ =1/11

I/I₀ =3/11

I/I₀ =2/11

I/I₀ =4/11

8. The conversion of a moving coil galvanometer into a voltmeter is done by *

1 分

introducing a resistance of large value in series.

(introducing a resistance of small value in parallel.

introducing a resistance of large value in parallel.

introducing a resistance of small value in series.

9. The maximum current that can be measured by a galvanometer of resistance 40 Ω is 10 mA. It is converted into voltmeter that can read up to 50 V. The resistance to be connected in the series with the galvanometer is *

2 分

2010 Ω

4690 Ω

4960 Ω

5040 Ω

10. Match the following *

4 分

Current Sensitivity

Bohr's second postulate

Bohr's magnetron

Gyromagnetic ratio

Angular momentum of an electron in any permissible orbit is integral multiple of h/2π

Deflection produced in the galvanometer when 1 ampere current is passed through it

The ratio of magnetic moment and orbital angular momentum of revolving electron is known as

Magnetic moment associated with an electron due to its orbital motion with an electron due to its orbital motion in the innermost orbit of hydrogen atom.

Current Sensitivity

Bohr's second postulate

Bohr's magnetron

Gyromagnetic ratio

Angular momentum of an electron in any permissible orbit is integral multiple of h/2π

Deflection produced in the galvanometer when 1 ampere current is passed through it

The ratio of magnetic moment and orbital angular momentum of revolving electron is known as

Magnetic moment associated with an electron due to its orbital motion with an electron due to its orbital motion in the innermost orbit of hydrogen atom.

11. Match the following *

3 分

NAB/k

NIAB Sinα

NAB/kR

Current Sensitivity

The value of torque (τ), when electric current passes through the galvanometer coil is

Voltage Sensitivity

12. Moving coil galvanometer is a instrument used to measure the electric current. *

1 分

TRUE

FALSE

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