Question # 1

The energy of the photon of wavelength 500 nm is.

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3.10 eV

2.49 eV

1.77 eV

1.52 eV

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

The current through a resistance of 100 Ohm when connecting across a source of 220 V is.

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22000 A

22 A

2.2 A

0.45 A

Terminal potential difference is greater than emf of the cell when

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Circuit is open

Circuit is closed

small battery is charged by bigger battery

None of these

The types of quacks are.

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2

3

4

6

For Paschen series, the value of 'n' starts from

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2

4

6

8

DC generator by william Sturgeon in:

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1894

1961

1834

1961

The value of Wien's constant:

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2.9x10^-3mk

2.19x10^-7mk

3.18 x10⁶ km^-1

6.21 x 10^-9m²wk³

An ordinary glass gradually softness into a paste like state before it becomes a very viscous liquid which is possible at

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900^oC

600^oC

800^oC

100^oC

Magnetic flux density is measured in

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Weber

Weber/m2

Tesla -m

Gauss

X_L=

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2πfL

1/2πfL

2πfL

fL/2π

The photoelectric effect predicts that light is made of

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Photons

Neutrons

Protons

None of these

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

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Electron

Proton

β particle

All

A two inputs NAND gat with inputs a and b has an output '0' if.

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B is zero

A is zero

Both A and B are 1

Both A and B are '0'

When Ohm meter gives full scale deflection it indicates.

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Zero resistance

Infinite resistance

Small resistance

Very High resistance

The motional emf is give by

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qvB

IBL

eBL

vBL

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

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Armature

Commutators

Split rings

Source of emf

Einstein photoelectric equation is

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None of these

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