Question # 1

Who explained the photo electric effect.

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Max Plank

Einstein

Henry

Rutherford

Albert Einstein got noble prize in:

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1926

1921

1918

1931

If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be

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50 V

2 V

5 V

15 V

Eintein's Photoelectric equation is E_k= hf -∅ in this equation E₁, refers to:

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K.E of al the emited electrons

Mean K.E of emited electrons

Maximum K.E of emited electrons

Minimum K.E of emited electrons

Disintegration of photon on striking a nucleus into an electron and positron is known as.

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Annihilation of matter

Compton effect

Pair production

Photo electric effect

The concept of direction is purely

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Relative

Absolute

Relative to the motion

None of these

A perfect absorber must also be perfect

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Cavity

Sources of radiation

Radiator

None of these

Einstein photoelectric equation is

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None of these

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

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

The most refined form of matter is:

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Smoke

Light

Ice

Fog

When platinum is it becomes orange at

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500^oC

900^oC

1100^oC

1300^oC

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

The existence of positron in 1928 was predicted by

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Anderson

Dirac

Chadwick

Plank

The value of Stefan is constant is:

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4.57 x 10^-8 m²k²

5.67 x10^-8 wm^-2k^-4

6.67x 10^-11 wm²k⁴

7.45 x 10^-9 m² wk³

Platinum wire becomes yellow at a temperature of.

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900^oC

1300^oC

1600^oC

500^oC

Max planck received noble prize in:

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1927

1932

1918

1914

Einstein was awarded Nobel prize in physics in

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1905

1911

1918

1921

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Physics FSC Part 2 Chapter 19 Online MCQ's Test MCQs With Answers

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