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Physics
Dual Nature of Radiation and Matter
Past Year (2006 - 2015) MCQs
Photoelectric Effect: Experiment (8 Qs)

1(current)

Q. No.

A source of light is placed at a distance of $50$ cm from a photocell and the stopping potential is found to be $V_0$. If the distance between the light source and photocell is made $25$ cm, the new stopping potential will be:

1.	$V_0 /2$	2.	$V_0 $
3.	$4V_0 $	4.	$2V_0 $

Q1:

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Subtopic: Photoelectric Effect: Experiment |

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In the photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is:

1. 1.3 V

2. 0.5 V

3. 2.3 V

4. 1.8 V

Q2:

74% From NCERT AIPMT - 2011

Subtopic: Photoelectric Effect: Experiment |

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A source S₁ is producing 10¹⁵ photons per sec of wavelength 5000 Å. Another source S₂ is producing 1.02×10¹⁵ photons per second of wavelength 5100 Å. Then, (power of S₂)/(power of S₁) is equal to:

1. 1.00

2. 1.02

3. 1.04

4. 0.98

Q3:

75% From NCERT AIPMT - 2010

Subtopic: Photoelectric Effect: Experiment |

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Monochromatic light of wavelength 667 nm is produced by a helium-neon laser. The power emitted is 9mW. The number of photons arriving per second on average at a target irradiated by this beam is:

1. 9 x 10¹⁷

2. 3 X 10¹⁶

3. 9 x 10¹⁵

4. 3 X 10¹⁹

Q4:

78% From NCERT AIPMT - 2009

Subtopic: Photoelectric Effect: Experiment |

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The figure shows a plot of photocurrent versus anode potential for a photosensitive surface for three different radiations. Which one of the following is a correct statement?

1.	Curves $a$ and $b$ represent incident radiations of different frequencies and different intensities.
2.	Curves $a$ and $b$ represent incident radiation of the same frequency but of different intensities.
3.	Curves $b$ and $c$ represent incident radiation of different frequencies and different intensities.
4.	Curves $b$ and $c$ represent incident radiations of the same frequency having the same intensity.

Q5:

85% From NCERT AIPMT - 2009

Subtopic: Photoelectric Effect: Experiment |

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The number of photoelectrons emitted for the light of a frequency

ν

(higher than the threshold frequency

ν

₀) is proportional to:

ν

ν

₀

2. threshold frequency (

ν

₀)

3. intensity of light

4. frequency of light (

ν

)

Q6:

78% From NCERT AIPMT - 2009

Subtopic: Photoelectric Effect: Experiment |

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Monochromatic light of frequency 6.0×10¹⁴ Hz is produced by a laser. The power emitted is 2×10^-3 W. The number of photons emitted, on average, by the source per second is:

1. $5 \times 10^{15}$

2. $5 \times 10^{16}$

3. $5 \times 10^{17}$

4. $5 \times 10^{14}$

Q7:

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Subtopic: Photoelectric Effect: Experiment |

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A photocell employs a photo-electric effect to convert:

1.	change in the frequency of light into a change in electric voltage.
2.	change in the intensity of illumination into a change in photoelectric current.
3.	change in the intensity of illumination into a change in the work function of the photocathode.
4.	change in the frequency of light into a change in the electric current.

Q8:

63% From NCERT AIPMT - 2006

Subtopic: Photoelectric Effect: Experiment |

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Botany Questions

Living World
Biological Classification
Plant Kingdom
Morphology of Flowering Plants
Anatomy of Flowering Plants
Cell-unit of Life
Cell Cycle and Cell Division
Transport in Plants
Mineral Nutrition
Photosynthesis in Higher Plants
Respiration in Plants
Plant Growth and Development
Reproduction in Organisms
Sexual Reproduction in Flowering Plants
Principles of Inheritance and Variation
Molecular Basis of Inheritance
Strategies for Enhancement in Food Production
Microbes in Human Welfare
Organisms and Populations
Ecosystem
Biodiversity and Conservation
Environmental Issues

Chemistry Questions

Some Basic Concepts of Chemistry
Structure of Atom
Classification of Elements and Periodicity in Properties
Chemical Bonding and Molecular Structure
States of Matter
Thermodynamics
Equilibrium
Redox Reactions
Hydrogen
The s-Block Elements
The p-Block Elements-XI
Organic Chemistry - Some Basic Principles and Techniques
Hydrocarbons
Environmental Chemistry
The Solid State
Solutions
Electrochemistry
Chemical Kinetics
Surface Chemistry
General Principles and Processes of Isolation of Elements
The p-Block Elements-XII
The d and f Block Elements
Coordination Compounds
Haloalkanes and Haloarenes
Alcohols, Phenols and Ethers
Aldehydes, Ketones and Carboxylic Acids
Amines
Biomolecules
Polymers
Chemistry in Everyday Life

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Units and Measurement
Mathematical Tools
Motion in A Straight Line
Motion in A Plane
Laws of Motion
Work, Energy and Power
Systems of Particles and Rotational Motion
Gravitation
Mechanical Properties of Solids
Mechanical Properties of Fluids
Thermal Properties of Matter
Thermodynamics
Kinetic Theory of Gases
Oscillations
Waves
Electric Charges and Fields
Electrostatic Potential and Capacitance
Current Electricity
Moving Charges and Magnetism
Magnetism and Matter
Electromagnetic Induction
Alternating Current
Electromagnetic Waves
Ray Optics and Optical Instruments
Wave Optics
Dual Nature of Radiation and Matter
Atoms
Nuclei
Semiconductor Electronics

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Animal Kingdom
Structural Organisation in Animals
Biomolecules
Digestion and Absorption
Breathing and Exchange of Gases
Body Fluids and Circulation
Excretory Products and their Elimination
Locomotion and Movement
Neural Control and Coordination
Chemical Coordination and Integration
Human Reproduction
Reproductive Health
Evolution
Human Health and Disease
Biotechnology Principles and Processes
Biotechnology and its Application

1.	Curves \(a\) and \(b\) represent incident radiations of different frequencies and different intensities.
2.	Curves \(a\) and \(b\) represent incident radiation of the same frequency but of different intensities.
3.	Curves \(b\) and \(c\) represent incident radiation of different frequencies and different intensities.
4.	Curves \(b\) and \(c\) represent incident radiations of the same frequency having the same intensity.

1.	\(V_0 /2\)	2.	\(V_0 \)
3.	\(4V_0 \)	4.	\(2V_0 \)