Question # 1

The wavelength associated with the protons moving at speed of 40 m/s is.

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7.20 nm

9.02

15.7 nm

17.3 nm

Two resistance of 2 Ohm each are connected in parallel combination equivalent resistance will be.

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4 Ohm

2 Ohm

1 Ohm

8 Ohm

μ_∘(Ampere's constant) has value.

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4πx10^-7 WbA^-1m^-1

4πx10^-17 Wbm²

4πx10⁷ WbA^-1m^-1

4πx10-27 Wb/m²

Presence of dielectric between two charges always.

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Reduces the electric force

Enhance the electric force

Does not effect electric force

Double the electric force

The unit of permiability of free space is:

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T.m/A

T.m²/A

T.m/A²

None of these

The field is strong and uniform.

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Inside the solenoid

Surrounding of solenoid externally

Perpendicular to solenoid

All of above

The central region of a transistor is called.

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Emitter

Collector

Base

Neutral

The position has charge which is in magnitude equal to the charge on

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Electron

Proton

β particle

All

If the length and number of turns of a solenoid are doubled strength of magnetic field with.

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Be doubled

Become half

Not change

Be four time

S.I unit of strength of electric field is

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J/C

C/V

V/C

N/C

The value of Rydberg constant is:

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1.0749x10⁷m^-1

1.0974 x 10⁷ m^-1

1.974 x10⁶m^-1

1.0974 x 10^-7 m^-1

The photon with energy greater than 1.02 MeV can interact with matter as.

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Photoelectric effect

Compton effect

Pair production

annihilation of matter

The jerks in D.C. motor are created by the use of.

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Armature

Commutators

Split rings

Source of emf

1 kg mass will be equivalent to energy.

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9 x 10⁸ J

9 X 10¹² J

9 X 10¹⁶ J

9 X 10¹⁹ J

A capacitor stores energy in the form of.

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Magnetic field

Heat energy

Electrical energy

Mechanical energy

Galvanometer is sensitive when C/BAN is

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zero

Large

small

Negative

A force of 0.01 N is exerted on a charge 1.2 x 10^-5 C at a certain point. The electric field at that point is

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1.2 x 10⁴ N/C

1.2 x 10⁴ C/N

8.3 x 10² N/C

8.3 x 10^-2 N/C

The SI unit of Stress is:

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Nm

Nm²

NM^-2

Nm³

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