# DUAL NATURE OF MATTER AND RADIATION

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DUAL NATURE OF MATTER AND RADIATION - Topic Wise Multiple Choice Questions (MCQ)

Topic Wise free Dual Nature of Matter and Radiation MCQ and solutions for 11th 12th exam Practice Multiple Choice Questions and answer for JEE-mains State CET Engineering Entrance GATE free Online Test

1 )

Particle A and B have electric charge + q and + 4 q. Both have mass m. If both are allowed to fall under the same p.d.,    ratio of velocities (VA / VB) = …………

2:1
1:2
1:4
4:1

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2 )

Energy of photon having wavelength λ is 2 eV. This photon when incident on metal. Maximum velocity of emitted is V. If λ is decreased 25% and maximum velocity is made double, work function of metal is……….eV

1
1.5
1.8
2.2

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3 )

When electric bulb having 100 W efficiency emits photon having wavelength 540 nm every second, numbers of photons will be……..(h = 6 × 10–34 J.s, c = 3 × 108 ms–1)

3 × 10^(18)
3 × 10^(20)
10
100

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4 )

If velocity of free electron is made double, change in its de-Broglie wavelength will be……..

increase by (λ/2)
decrease by (λ/2)
increase by 2λ
decrease 2λ

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5 )

de-Broglie wavelength of proton accelerated under 100 V electric potential difference is λ0. If de-wave length α-particle   accelerated by the same electric potential difference what will its bouglie wavelength……….

2√2λ0
{λ0 / (2√2)}
(λ0 / √2)
(λ0 / 2)

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