Question # 1

Light of 4.5 eV is incident on a Cesium surface and stopping potential is 0.25 eV, maximum K.E. of emitted electron is.

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4.5 eV

4.25 eV

4.75 eV

0.25 eV

Radius of first Bohr's orbit is.

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0.053 nm

0.053 mm

0.053 micro meter

0.053 m

A changing electric flux creates.

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Electric fields

Gravitational

Magnetic field

Electric charge

The unit of conductivity is:

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Ohm^-3m^-1

Ohm m^-1

Both a and b

Ohm m^-1

Reflecting mirrors in laser is used to

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Further stimulation

For producing more energetic lasers

Both (a) and (b)

None of these

A dot represents the direction of magnetic field.

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Out of page

Into the page

Tangent to page

Parallels to page

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

The field is strong and uniform.

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Inside the solenoid

Surrounding of solenoid externally

Perpendicular to solenoid

All of above

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

The conductors having the conductivity of the order of

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Study of hydrogen visible spectrum in

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1886

1887

1895

1885

The photo copying process is called

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Xerography

Inkjet Printer

Both (a) and (b)

None of these

Who explained the photo electric effect.

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Max Plank

Einstein

Henry

Rutherford

The open loop gain of the amplifier is order of.

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10⁶

10⁵

10⁷

10³

A solid having regular arrangement of molecules throughout its structure is called.

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Amorphous solid

Polymeric solid

Crystalline solid

Glassy solid

The potential barrier for silicon is.

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0.7 V

0.5 V

0.3 V

0.9 V

The sum of electric and magnetic force is called.

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Maxwell force

Lorentz force

Newton's force

Centripetal force

A charged conductor has charge on its.

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Inner surface

Outer surface

Middle surface

Surrounding space

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