1
ArulmiguMeenakshi Amman College of Engineering
Vadamavandal-604410.
Important Question and Answers
PH25C01- Applied Physics -I
Prepared by
V.Umapathy,
Prof. /Mech.
S.No Question Answer
Syllabus
S.No. Describtion
1 Properties of Matter: Elasticity, Cantilever, Young’s modulus (non-uniform
bending), Girders: Bridges and buildings, Viscosity: Stokes method, Surface tension:
drop weight method, Thermal expansion, Thermal stress, Bimetallic strips, Expansion
joints.
Practical: Non-Uniform bending, Young’s modulus of the material, Torsional
pendulum, Rigidity modulus of the wire and moment of inertia of the disc.
Activities: Virtual demonstration of thermal stress.
2 Oscillations: Simple Harmonic motion, Torsional pendulum, Couple per unit twist,
Damped and Forced Oscillation.
Waves: Waves on a stretched string, Energy and Power, standing waves, Ultrasonics,
piezo, electric method, Acoustic grating, Electromagnetic waves: Maxwell equation,
Production of EM waves by dipole antenna, Propagation of EM waves in free space ,
wave equation, Cell phone reception .
Practical: Melde’s string experiment – Frequency of an electrically vibrating metal
tip.
Activities: Virtual demonstration of propagation of EM waves .
3 Quantum Mechanics: Black body radiation, Photoelectric effect, de Broglie
hypothesis, Schrodinger Wave equation, Particle in a box (infinite potential well -
three-dimensional box), Barrier penetration and quantum tunnelling.
Practical: Photo-electric effect, Determination of Planck’s constant.
Activities: Virtual demonstration of Scanning Transmission Electron Microscope.
4 Applied Optics: Interference: Air wedge, Michelson’s Interferometer, Fiber optics:
Structure of a fiber, Fiber Optic Communication System, Fiber Sensors (Virtual
demo), Displacement, pressure sensor and Temperature sensor, Einstein Co-efficient,
Nd:YAG laser, CO2 laser (construction, functioning and applications), dye laser
Practical: Ruling width of Compact disc using Laser, Thickness of a thin sheet/wire
using Air wedge Method.
, 2
Activities: Demonstration of sensors and applications of Lasers
Unit-I
Properties of Matter
Two mark Question and Answers
1. What is elasticity?
Answer: Elasticity is the property of a material to return to its original shape and size after
the removal of an external force.
2. Define Young's modulus.
Answer: Young's modulus is the ratio of stress to strain within the proportional limit of a
material, representing its stiffness.
3. What is the purpose of a cantilever in construction?
Answer: Cantilevers are used in construction to support structures such as bridges,
buildings, and roofs, providing a projecting beam or structure that is fixed at one end.
4. How does non-uniform bending affect the calculation of Young's modulus?
Answer: In non-uniform bending, the calculation of Young's modulus is more complex,
requiring consideration of the varying bending moment and curvature.
5. What is a girder?
Answer: A girder is a horizontal beam used in construction to support loads from bridges,
buildings, or other structures.
6. Why are girders used in construction?
Answer: Girders are used to provide support and stability to structures, distributing loads
evenly and resisting bending and twisting forces.
7. Define viscosity.
Answer: Viscosity is the measure of a fluid's resistance to flow, representing its internal
friction.
8. Define surface tension.
Answer: Surface tension is the energy per unit area of a liquid surface, causing it to behave
as an elastic membrane.
9. Define the coefficient of thermal expansion.
Answer: The coefficient of thermal expansion is the fractional change in size of a material
per unit change in temperature.
10. Why are expansion joints important?
Answer: Expansion joints are important to prevent damage to structures due to thermal
stress, ensuring their stability and longevity.
13 and 15 Marks QA
11. Explain in details Properties of Matter.
, 3
Matter is anything that has mass and occupies space. It can exist in various forms, such as
solid, liquid, gas, or plasma. The properties of matter are the characteristics that describe its
behavior, composition, and interactions with other substances. Understanding the properties
of matter is crucial in physics, chemistry, and engineering.
, 4
Physical Properties of Matter
Physical properties are attributes that can be observed or measured without changing the
substance's chemical identity. These properties can be further divided into intensive and
extensive properties.
Intensive Properties
Intensive properties are independent of the amount of substance present.
1. Density: Mass per unit volume (kg/m³ or g/cm³)
- Example: Water has a density of 1 g/cm³, while iron has a density of 7.9 g/cm³.
2. Melting Point: Temperature at which a solid changes to a liquid (K or °C)
- Example: Ice melts at 0°C (32°F).
3. Boiling Point: Temperature at which a liquid changes to a gas (K or °C)
- Example: Water boils at 100°C (212°F).
4. Color: Visible light reflected or emitted by the substance
- Example: Copper is reddish-brown, while gold is yellow.
5. Hardness: Resistance to scratching or abrasion (Mohs scale)
- Example: Diamond is the hardest substance (10 on the Mohs scale).
Extensive Properties
Extensive properties depend on the amount of substance present.
1. Mass: Measure of the amount of matter (kg or g)
- Example: A bowling ball has more mass than a tennis ball.
2. Volume: Amount of space occupied by the substance (m³ or L)
- Example: A large container holds more water than a small one.
3. Weight: Force exerted by gravity on the substance (N)
- Example: An object weighs less on the Moon than on Earth.
4. Length: Linear dimension of the substance (m or cm)
- Example: A ruler is 30 cm long.
Chemical Properties of Matter
Chemical properties describe a substance's ability to undergo chemical changes or
reactions.
1. Flammability: Ability to burn or ignite
- Example: Gasoline is highly flammable.
2. Reactivity: Tendency to react with other substances
- Example: Sodium reacts violently with water.
3. Toxicity: Harmfulness to living organisms
- Example: Mercury is toxic and can cause poisoning.
ArulmiguMeenakshi Amman College of Engineering
Vadamavandal-604410.
Important Question and Answers
PH25C01- Applied Physics -I
Prepared by
V.Umapathy,
Prof. /Mech.
S.No Question Answer
Syllabus
S.No. Describtion
1 Properties of Matter: Elasticity, Cantilever, Young’s modulus (non-uniform
bending), Girders: Bridges and buildings, Viscosity: Stokes method, Surface tension:
drop weight method, Thermal expansion, Thermal stress, Bimetallic strips, Expansion
joints.
Practical: Non-Uniform bending, Young’s modulus of the material, Torsional
pendulum, Rigidity modulus of the wire and moment of inertia of the disc.
Activities: Virtual demonstration of thermal stress.
2 Oscillations: Simple Harmonic motion, Torsional pendulum, Couple per unit twist,
Damped and Forced Oscillation.
Waves: Waves on a stretched string, Energy and Power, standing waves, Ultrasonics,
piezo, electric method, Acoustic grating, Electromagnetic waves: Maxwell equation,
Production of EM waves by dipole antenna, Propagation of EM waves in free space ,
wave equation, Cell phone reception .
Practical: Melde’s string experiment – Frequency of an electrically vibrating metal
tip.
Activities: Virtual demonstration of propagation of EM waves .
3 Quantum Mechanics: Black body radiation, Photoelectric effect, de Broglie
hypothesis, Schrodinger Wave equation, Particle in a box (infinite potential well -
three-dimensional box), Barrier penetration and quantum tunnelling.
Practical: Photo-electric effect, Determination of Planck’s constant.
Activities: Virtual demonstration of Scanning Transmission Electron Microscope.
4 Applied Optics: Interference: Air wedge, Michelson’s Interferometer, Fiber optics:
Structure of a fiber, Fiber Optic Communication System, Fiber Sensors (Virtual
demo), Displacement, pressure sensor and Temperature sensor, Einstein Co-efficient,
Nd:YAG laser, CO2 laser (construction, functioning and applications), dye laser
Practical: Ruling width of Compact disc using Laser, Thickness of a thin sheet/wire
using Air wedge Method.
, 2
Activities: Demonstration of sensors and applications of Lasers
Unit-I
Properties of Matter
Two mark Question and Answers
1. What is elasticity?
Answer: Elasticity is the property of a material to return to its original shape and size after
the removal of an external force.
2. Define Young's modulus.
Answer: Young's modulus is the ratio of stress to strain within the proportional limit of a
material, representing its stiffness.
3. What is the purpose of a cantilever in construction?
Answer: Cantilevers are used in construction to support structures such as bridges,
buildings, and roofs, providing a projecting beam or structure that is fixed at one end.
4. How does non-uniform bending affect the calculation of Young's modulus?
Answer: In non-uniform bending, the calculation of Young's modulus is more complex,
requiring consideration of the varying bending moment and curvature.
5. What is a girder?
Answer: A girder is a horizontal beam used in construction to support loads from bridges,
buildings, or other structures.
6. Why are girders used in construction?
Answer: Girders are used to provide support and stability to structures, distributing loads
evenly and resisting bending and twisting forces.
7. Define viscosity.
Answer: Viscosity is the measure of a fluid's resistance to flow, representing its internal
friction.
8. Define surface tension.
Answer: Surface tension is the energy per unit area of a liquid surface, causing it to behave
as an elastic membrane.
9. Define the coefficient of thermal expansion.
Answer: The coefficient of thermal expansion is the fractional change in size of a material
per unit change in temperature.
10. Why are expansion joints important?
Answer: Expansion joints are important to prevent damage to structures due to thermal
stress, ensuring their stability and longevity.
13 and 15 Marks QA
11. Explain in details Properties of Matter.
, 3
Matter is anything that has mass and occupies space. It can exist in various forms, such as
solid, liquid, gas, or plasma. The properties of matter are the characteristics that describe its
behavior, composition, and interactions with other substances. Understanding the properties
of matter is crucial in physics, chemistry, and engineering.
, 4
Physical Properties of Matter
Physical properties are attributes that can be observed or measured without changing the
substance's chemical identity. These properties can be further divided into intensive and
extensive properties.
Intensive Properties
Intensive properties are independent of the amount of substance present.
1. Density: Mass per unit volume (kg/m³ or g/cm³)
- Example: Water has a density of 1 g/cm³, while iron has a density of 7.9 g/cm³.
2. Melting Point: Temperature at which a solid changes to a liquid (K or °C)
- Example: Ice melts at 0°C (32°F).
3. Boiling Point: Temperature at which a liquid changes to a gas (K or °C)
- Example: Water boils at 100°C (212°F).
4. Color: Visible light reflected or emitted by the substance
- Example: Copper is reddish-brown, while gold is yellow.
5. Hardness: Resistance to scratching or abrasion (Mohs scale)
- Example: Diamond is the hardest substance (10 on the Mohs scale).
Extensive Properties
Extensive properties depend on the amount of substance present.
1. Mass: Measure of the amount of matter (kg or g)
- Example: A bowling ball has more mass than a tennis ball.
2. Volume: Amount of space occupied by the substance (m³ or L)
- Example: A large container holds more water than a small one.
3. Weight: Force exerted by gravity on the substance (N)
- Example: An object weighs less on the Moon than on Earth.
4. Length: Linear dimension of the substance (m or cm)
- Example: A ruler is 30 cm long.
Chemical Properties of Matter
Chemical properties describe a substance's ability to undergo chemical changes or
reactions.
1. Flammability: Ability to burn or ignite
- Example: Gasoline is highly flammable.
2. Reactivity: Tendency to react with other substances
- Example: Sodium reacts violently with water.
3. Toxicity: Harmfulness to living organisms
- Example: Mercury is toxic and can cause poisoning.
