Physics Test 1 355 Questions And Answers

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  • 1/355 Questions

    1 kg-m/sec/sec is equal to

    • 1 Newton
    • 1 pound
    • 1000 Newton
    • 9.81 kg
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About This Quiz


Each question is followed by five options lettered A - E. Find out the correct
option for each question and shade in pencil, on your sheet, the answer space
which bears the same letter as the option you have chosen. Give only ONE
answer to each question.

Physics Test 1 355 Questions And Answers - Quiz

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  • 2. 

     Name 2 famous physicist:

    • Thomas Edison

    • Issac Newton

    • Galileo Galilei

    • Ben Franklin

    • Dr. Spock

    Correct Answer(s)
    A. Issac Newton
    A. Galileo Galilei
    Explanation
    Isaac Newton and Galileo Galilei are both famous physicists known for their significant contributions to the field of physics. Isaac Newton is famous for his laws of motion and universal gravitation, while Galileo Galilei is known for his discoveries in mechanics and astronomy. Both scientists revolutionized our understanding of the natural world and their work laid the foundation for modern physics.

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  • 3. 

    Reflection Is The ____ Of A Wave When It Hits A Surface

    • Bounce

    • Merage

    • Converging

    • Diverging

    • Diffuse

    Correct Answer
    A. Bounce
    Explanation
    When a wave hits a surface, it undergoes reflection, which means that it bounces off the surface. This is why the correct answer is "Bounce".

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  • 4. 

    Being Able To See Things Far Away But Not Up Close

    • Farsighted

    • Nearsighted

    • Real

    • Normal

    • Focal Point

    Correct Answer
    A. Farsighted
    Explanation
    Farsightedness, also known as hyperopia, is a condition in which a person can see objects that are far away clearly, but has difficulty focusing on objects that are up close. This occurs when the eyeball is shorter than normal or the cornea is too flat, causing light to focus behind the retina instead of directly on it. As a result, close-up objects appear blurry. Farsightedness can be corrected with glasses, contact lenses, or refractive surgery.

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  • 5. 

    A Reflection Of Sound Waves

    • Echo

    • Acustics

    • Focal Length

    • Focal Point

    • Index Of Refraction

    Correct Answer
    A. Echo
    Explanation
    An echo refers to the reflection of sound waves off a surface and back to the listener. When sound waves encounter a solid object, such as a wall or a mountain, they bounce back and reach the ear after a certain delay. This phenomenon is called an echo. It is commonly experienced in open spaces or large rooms where sound waves can travel a significant distance before reflecting back. The correct answer, "echo," accurately describes this reflection of sound waves.

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  • 6. 

    N Is The Symbol For What Property

    • Index Of Refraction

    • Water

    • Focal Length

    • Air Temperature

    • N=

    Correct Answer
    A. Index Of Refraction
    Explanation
    The symbol "N" is commonly used to represent the index of refraction in physics. The index of refraction is a property of a material that describes how light propagates through it. It is a dimensionless quantity that indicates how much the speed of light is reduced when passing through a medium compared to its speed in a vacuum. Therefore, "N" being the symbol for the index of refraction is the correct answer.

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  • 7. 

    What are the 3 basic units in the scientific system of units (SI system) we have used in class?

    • Miles, kilograms, seconds

    • Meters, kelvins, seconds

    • Miles, pounds, seconds

    • Meters, kilograms, seconds

    • Meters, kilograms, mi/hour

    Correct Answer
    A. Meters, kilograms, seconds
    Explanation
    The SI system of units is a widely used system of measurement in scientific and technical fields. It is based on three fundamental units: meters for length, kilograms for mass, and seconds for time. These units are considered the basic building blocks of the SI system and are used to derive other units of measurement.

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  • 8. 

    Which of the following units would be approriate to describe force?

    • Kg*m/s^2

    • M/s^2

    • Kg/s

    • Kg*m/s

    • None

    Correct Answer
    A. Kg*m/s^2
    Explanation
    The unit kg*m/s^2, also known as Newton (N), is the appropriate unit to describe force. This is because force is defined as the product of mass (kg) and acceleration (m/s^2) according to Newton's second law of motion. The unit kg*m/s^2 represents the amount of force required to accelerate a mass of 1 kilogram at a rate of 1 meter per second squared. Therefore, kg*m/s^2 is the correct unit for force.

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  • 9. 

    A 5.0-kg cat travels to the left at 10 m/s and a 10-kg dog travels to the right at 5.0 m/s. The total momentum is

    • 125 kg m/s to the left

    • 0

    • 50 kg m/s to the right

    • 100 kg m/s to the right

    • None

    Correct Answer
    A. 0
    Explanation
    The total momentum is 0 because momentum is a vector quantity, meaning it has both magnitude and direction. In this case, the cat and the dog are moving in opposite directions with equal magnitudes of momentum. The cat has a momentum of 5.0 kg m/s to the left, while the dog has a momentum of 50 kg m/s to the right. When we add these two momenta together, they cancel each other out and result in a total momentum of 0.

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  • 10. 

    The three processes by which heat energy is transferred between objects are

    • Heat, calorie and radiation

    • Radiation, temperature and convection

    • Absorption, radiation and convection

    • Radiation, convection and conduction

    • None

    Correct Answer
    A. Radiation, convection and conduction
    Explanation
    The correct answer is radiation, convection, and conduction. Heat energy can be transferred between objects through radiation, which involves the emission and absorption of electromagnetic waves. Convection is another process where heat is transferred through the movement of fluids or gases. Lastly, conduction refers to the transfer of heat through direct contact between objects. These three processes are the main ways in which heat energy is transferred between objects.

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  • 11. 

    The approximate range of frequencies a human ear can hear is

    • 2 Hz to 2000 Hz

    • 20 Hz to 2000 Hz

    • 20 Hz to 20,000 Hz

    • 200 Hz to 200,000 Hz

    • None

    Correct Answer
    A. 20 Hz to 20,000 Hz
    Explanation
    The approximate range of frequencies that a human ear can hear is from 20 Hz to 20,000 Hz. This range is commonly referred to as the audible frequency range. Frequencies below 20 Hz are considered infrasound and are typically felt rather than heard, while frequencies above 20,000 Hz are considered ultrasound and are also generally not audible to humans.

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  • 12. 

    Why is alternating current (ac) used to distribute electric power?

    • Power stations can only generate ac current

    • Transformers can easily reduce the required ac current for transmission from a power station

    • Because dc is known as dangerous current

    • Because of cancer awareness of high voltage transmission lines

    • Alternating current is not used to distribute electric power

    Correct Answer
    A. Transformers can easily reduce the required ac current for transmission from a power station
    Explanation
    Alternating current (AC) is used to distribute electric power because transformers can easily reduce the required AC current for transmission from a power station. Transformers are able to step up or step down the voltage of the AC current, making it more efficient for long-distance transmission and easier to distribute to different areas. This allows for the efficient and widespread distribution of electric power.

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  • 13. 

    Diffraction becomes more important as the

    • Amplitude increases

    • Wavelength decreases

    • Proportional to mass and speed

    • Inversely proportional to mass and speed

    • Proportional to frequency

    Correct Answer
    A. Inversely proportional to mass and speed
    Explanation
    Diffraction is the bending or spreading of waves around obstacles or through openings. It occurs when waves encounter an obstacle that is comparable in size to their wavelength. The phenomenon of diffraction is more pronounced when the wavelength is larger and the obstacle is smaller. In the given options, the only choice that is consistent with this explanation is "inversely proportional to mass and speed." This suggests that as the mass and speed of the waves increase, the diffraction becomes less significant.

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  • 14. 

    Which one of the following was important in showing the particle-like properties of light?

    • Photoelectric effect

    • Single slit diffraction

    • Double slit experiment

    • Refraction

    • Fluorescence

    Correct Answer
    A. Photoelectric effect
    Explanation
    The photoelectric effect is important in showing the particle-like properties of light because it demonstrates that light is composed of discrete packets of energy called photons. When light shines on a metal surface, electrons are emitted only when the energy of the photons exceeds a certain threshold. This phenomenon cannot be explained by the wave nature of light, but it aligns with the particle nature of light. Therefore, the photoelectric effect provided strong evidence for the existence of photons and the particle-like behavior of light.

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  • 15. 

    In class it was shown that various minerals appeared different when observed with

    • A microscope

    • An ultraviolet light source

    • An x-ray image

    • Polarized light

    • Ultrasonic waves

    Correct Answer
    A. An ultraviolet light source
    Explanation
    Ultraviolet light has the ability to cause certain minerals to fluoresce, meaning they emit visible light when exposed to UV light. This phenomenon can be used to identify and distinguish different minerals based on their unique fluorescence patterns. Therefore, using an ultraviolet light source allows for the visualization and differentiation of minerals that may not be apparent under normal light.

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  • 16. 

    The photon model of light is more appropriate than the wave model in explaining

    • Interference

    • Refraction

    • Polarization

    • Photoelectric emission

    Correct Answer
    A. Photoelectric emission
    Explanation
    The photon model of light is more appropriate than the wave model in explaining photoelectric emission because the photoelectric effect involves the interaction of light with matter at the particle level. According to the photon model, light is made up of discrete packets of energy called photons. When a photon of sufficient energy interacts with an atom or a material, it can transfer its energy to an electron, causing it to be emitted from the material. The wave model of light, on the other hand, does not account for the discrete nature of photons and cannot explain the phenomenon of photoelectric emission accurately.

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  • 17. 

    Light demonstartes the characteristics of

    • Particles only

    • Waves only

    • Both particles and waves

    • Neither

    Correct Answer
    A. Both particles and waves
    Explanation
    Light demonstrates the characteristics of both particles and waves. This is known as the wave-particle duality of light. In some experiments, light behaves as a wave, showing interference and diffraction patterns. In other experiments, it behaves as a particle, known as a photon, interacting with matter in discrete packets of energy. This phenomenon was first explained by quantum theory and is a fundamental aspect of understanding the nature of light.

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  • 18. 

    Electrons are made to flow in a wire when there is 

    • An imbalance of charges in the wire

    • More potential energy at one end of the wire than the other

    • A potential difference across its ends

    Correct Answer
    A. A potential difference across its ends
    Explanation
    When there is a potential difference across the ends of a wire, it means that there is a difference in electric potential energy between the two ends. This potential difference creates an electric field within the wire, which exerts a force on the electrons. The electrons, being negatively charged, are then pushed by this force and start to flow in the wire. This flow of electrons is what we refer to as an electric current. Therefore, the presence of a potential difference across the ends of a wire is what causes electrons to flow in the wire.

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  • 19. 

    An ampere is a unit of electrical

    • Pressure

    • Current

    • Resistance

    • All of these

    • None of these

    Correct Answer
    A. Current
    Explanation
    The correct answer is current. An ampere is indeed a unit of electrical current. It measures the flow of electric charge through a conductor. Current is the rate at which electric charges pass through a given point in a circuit. It is measured in amperes (A) and is a fundamental concept in understanding and analyzing electrical circuits.

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  • 20. 

    A wire that carries an electric current

    • Is electrically charged

    • May be electrically charged

    • Is never electrically charged

    Correct Answer
    A. May be electrically charged
    Explanation
    A wire that carries an electric current may be electrically charged because the flow of electric charges through the wire creates an electric field around it. This electric field can result in the wire becoming charged, depending on the conditions and the presence of other factors such as insulation or grounding. Therefore, it is possible for a wire carrying an electric current to be electrically charged.

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  • 21. 

    A coulomb of charge that passes through a 6-volt battery is given

    • 6 joules

    • 6 amperes

    • 6 ohms

    • 6 watts

    • 6 newtons

    Correct Answer
    A. 6 joules
    Explanation
    When a coulomb of charge passes through a 6-volt battery, the amount of work done is equal to the product of the charge and the potential difference. In this case, the work done is 6 joules, as 1 joule is defined as the amount of work done when a force of 1 newton is applied over a distance of 1 meter. Therefore, the correct answer is 6 joules.

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  • 22. 

    The current through a 10-ohm resistor connected to a 120-V power supply is

    • 1 A

    • 10 A

    • 12 A

    • 120 A

    • None of these

    Correct Answer
    A. 12 A
    Explanation
    The current through a resistor connected to a power supply is determined by Ohm's Law, which states that current is equal to voltage divided by resistance. In this case, the voltage is 120 V and the resistance is 10 ohms. Therefore, the current can be calculated as 120 V divided by 10 ohms, which equals 12 A.

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  • 23. 

    A 10-ohm resistor has a 5-A current in it. What is the voltage across the resistor?

    • 5 V

    • 10 V

    • 15 V

    • 20 V

    • More than 20 V

    Correct Answer
    A. More than 20 V
    Explanation
    According to Ohm's law, the voltage across a resistor is equal to the current flowing through it multiplied by the resistance. In this case, the current is 5 A and the resistance is 10 ohms. Therefore, the voltage across the resistor is 5 A * 10 ohms = 50 V. Since 50 V is more than 20 V, the correct answer is "More than 20 V".

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  • 24. 

    A woman experiences an electrical shock. The electrons making the shock come from the

    • Woman's body

    • Ground

    • Power plant

    • Hairdryer

    • Electric field in the air

    Correct Answer
    A. Woman's body
    Explanation
    When a woman experiences an electrical shock, the electrons that cause the shock come from her own body. This can happen when she comes into contact with a conductive material or an electrical source, allowing the flow of electrons from her body to the other object.

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  • 25. 

    A capacitor is used to store

    • Charge

    • Energy

    • Both

    • Neither

    Correct Answer
    A. Both
    Explanation
    A capacitor is an electronic component that is used to store electrical charge. When a voltage is applied across the terminals of a capacitor, it stores energy in an electric field. This stored charge can be released later, making capacitors useful for various applications such as energy storage, filtering, and timing circuits. Therefore, the correct answer is "both" charge and energy, as a capacitor is used to store both.

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  • 26. 

    What is the power rating of a light bulb if 0.8 A flow through it when it is connected to a 120-volt outlet?

    • 12 W

    • 15 W

    • 60 W

    • 96 W

    • 120 W

    Correct Answer
    A. 96 W
    Explanation
    The power rating of a light bulb can be calculated using the formula P = V * I, where P is the power in watts, V is the voltage in volts, and I is the current in amperes. In this case, the voltage is given as 120 volts and the current is given as 0.8 amperes. Plugging these values into the formula, we get P = 120 * 0.8 = 96 watts. Therefore, the power rating of the light bulb is 96 watts.

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  • 27. 

    The headlights, radio, and defroster fan in an automobile are connected in

    • Series

    • Parallel

    Correct Answer
    A. Parallel
    Explanation
    The headlights, radio, and defroster fan in an automobile are connected in parallel. This means that each component has its own separate connection to the power source, allowing them to operate independently. In a parallel circuit, if one component fails or is turned off, the others can still function normally. This is important in a car, as it ensures that even if one of these components experiences an issue, the others can still operate, providing necessary functions such as lighting, entertainment, and defrosting.

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  • 28. 

    A 4-ohm resistor is connected in parallel with a 6-ohm resistor. this combination produces an equivalent resistance of 

    • 2.4 ohms

    • 4 ohms

    • 5 ohms

    • 5.5 ohms

    • 10 ohms

    Correct Answer
    A. 2.4 ohms
    Explanation
    When resistors are connected in parallel, the equivalent resistance is calculated using the formula: 1/Req = 1/R1 + 1/R2 + 1/R3 + ... In this case, the 4-ohm resistor and the 6-ohm resistor are connected in parallel. Plugging in the values, we get 1/Req = 1/4 + 1/6. Simplifying this equation, we find that 1/Req = 5/12. Taking the reciprocal of both sides, we get Req = 12/5, which is equal to 2.4 ohms.

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  • 29. 

    Which is more dangerous, touching a faulty 110-volt light fixture, or a van de graaff generator charged to 100,00 volts?

    • Touching the light fixture

    • Touching the generator

    • Touching both are about equally dangerous

    Correct Answer
    A. Touching the light fixture
    Explanation
    Touching a faulty 110-volt light fixture is more dangerous than touching a Van de Graaff generator charged to 100,000 volts. This is because the voltage of the light fixture is within the range of what is commonly found in households, making it more likely to come into contact with it. Additionally, faulty wiring or insulation in the light fixture can increase the risk of electrical shock. On the other hand, the high voltage of the Van de Graaff generator may seem more intimidating, but the current it produces is typically very low, making it less likely to cause harm.

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  • 30. 

    "Half-life" can simply be defined as the time taken for half the number of nucleons in a sample to decay

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is true because the half-life of a radioactive substance refers to the time it takes for half of the atoms in a sample to decay. This means that after one half-life, half of the original atoms have decayed, and after two half-lives, only one-fourth of the original atoms remain, and so on. The concept of half-life is commonly used in nuclear physics and radiocarbon dating to determine the age of materials.

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  • 31. 

    Fuels that have been produced from the accumulations of dead matter are known as ...

    Correct Answer
    fossil fuels
    Explanation
    Fuels that have been produced from the accumulations of dead matter are known as fossil fuels. Fossil fuels are formed from the remains of plants and animals that lived millions of years ago. Over time, these organic materials were subjected to heat and pressure, resulting in the formation of coal, oil, and natural gas. Fossil fuels are non-renewable resources and are the primary source of energy for various human activities such as transportation, electricity generation, and heating.

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  • 32. 

    “When the result of a change in a process is a further change of one of the constants involved” is a simply put definition of "feedback"

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The given statement defines "feedback" as the result of a change in a process leading to a further change in one of the constants involved. This means that when a change occurs in a process, it triggers a response that causes another change in one of the constants. Therefore, the statement is true.

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  • 33. 

    The unit of electric charge, the coulomb, is the charge on

    • One electron

    • A specific large number of electrons

    Correct Answer
    A. A specific large number of electrons
    Explanation
    The correct answer is "A specific large number of electrons." This is because the coulomb is a unit of electric charge that represents a large quantity of charge. Since the charge of a single electron is very small, it would not be practical to use it as the unit for measuring electric charge on a larger scale. Therefore, the coulomb is defined as the charge on a specific large number of electrons, making it a more convenient and practical unit for practical applications in electricity and magnetism.

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  • 34. 

    An electron and a proton

    • Attract each other

    • Repel each other

    Correct Answer
    A. Attract each other
    Explanation
    Electrons and protons have opposite charges. The electron carries a negative charge, while the proton carries a positive charge. According to the law of electrostatics, opposite charges attract each other. Therefore, an electron and a proton would attract each other due to the attraction between their opposite charges.

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  • 35. 

    When a car is struck by lightning, the resulting electric field inside the car is

    • Normally huge, but for brief time

    • Normally huge for a time longer than the lightning stroke itself

    • Small enough to be safe for an occupant inside

    • Zero

    Correct Answer
    A. Zero
    Explanation
    When a car is struck by lightning, the resulting electric field inside the car is zero. This is because the car acts as a Faraday cage, which means that the electric field is distributed evenly on the outer surface of the car and does not penetrate inside. Therefore, the occupants inside the car are protected from the lightning strike and the electric field is effectively zero inside the car.

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  • 36. 

    A difference between electric forces and gravitational forces is that electrical forces include

    • Separation distance

    • Repulsive interactions

    • The inverse square law

    • Infinite range

    • None of these

    Correct Answer
    A. Repulsive interactions
    Explanation
    The correct answer is repulsive interactions. Electric forces can be either attractive or repulsive, while gravitational forces are always attractive. Repulsive interactions occur when like charges (positive-positive or negative-negative) push each other away, while attractive interactions occur when opposite charges (positive-negative) attract each other.

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  • 37. 

    Every proton in the universe is surrounded by its own

    • Electric field

    • Gravitational field

    • Both of these

    • Non of these

    Correct Answer
    A. Both of these
    Explanation
    Every proton in the universe is surrounded by its own electric field and gravitational field. The electric field is a force field that surrounds a charged particle, such as a proton, and affects other charged particles in its vicinity. The gravitational field is a force field that surrounds any object with mass, such as a proton, and affects other objects with mass. Therefore, both electric and gravitational fields exist around every proton in the universe.

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  • 38. 

    Normally a balloon charged to several thousand volts has a relatively small amount of

    • Charge

    • Energy

    • Both

    • Neither

    Correct Answer
    A. Both
    Explanation
    A balloon charged to several thousand volts has both a relatively small amount of charge and energy. When a balloon is charged with static electricity, it gains a charge, which refers to the excess or deficiency of electrons on its surface. This charge is measured in volts. Additionally, the balloon gains energy in the form of electrical potential energy due to the accumulation of charges. Therefore, both charge and energy are present in a balloon charged to several thousand volts.

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  • 39. 

    The electric field inside an uncharged metal ball is zero. If the ball is negatively charged, the electric field inside the ball is then 

    • Less than zero.

    • Zero.

    • Greater than zero.

    Correct Answer
    A. Zero.
    Explanation
    When an object is uncharged, it means that it has an equal number of positive and negative charges, resulting in a net charge of zero. In this case, the electric field inside the metal ball is zero because the positive and negative charges cancel each other out. When the ball is negatively charged, it means that it has an excess of negative charges. However, the electric field inside the ball is still zero because the excess negative charges distribute themselves evenly throughout the metal, resulting in a cancellation of electric field. Therefore, the correct answer is zero.

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  • 40. 

    In hot summer days reflection of water is seen on the road due to ______________.

    • Reflection

    • Refraction

    • Total internal reflection

    • Dispersion

    Correct Answer
    A. Total internal reflection
    Explanation
    In hot summer days, the reflection of water is seen on the road due to total internal reflection. Total internal reflection occurs when light travels from a medium with a higher refractive index to a medium with a lower refractive index, at an angle greater than the critical angle. In this case, when light travels from water (higher refractive index) to air (lower refractive index) at a steep angle, it undergoes total internal reflection, causing the reflection of water to be visible on the road.

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  • 41. 

    If the zero of the circular scale is below the horizontal line the zero error is to be_______________

    • Added

    • Subtracted

    • Multiplied

    • Divided

    Correct Answer
    A. Subtracted
    Explanation
    If the zero of the circular scale is below the horizontal line, it means that the scale is not properly aligned with the reference point. This misalignment creates a zero error, which needs to be corrected. To correct the zero error, we subtract the error value from the measured readings. Therefore, the correct answer is subtracted.

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  • 42. 

    The capacity to do work

    • Electricity

    • Kilowatts

    • Energy

    • Force

    Correct Answer
    A. Energy
    Explanation
    Energy is the correct answer because it is the capacity to do work. Electricity, kilowatts, and force are all related to energy, but they are not the actual definition of energy itself. Energy can exist in different forms such as kinetic, potential, thermal, or chemical, and it can be converted from one form to another. Therefore, energy is the most accurate term to describe the capacity to do work.

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  • 43. 

    A form of energy that is transferred by a difference in temperature

    • Electrical energy

    • Chemical energy

    • Thermal energy

    • Potential energy

    Correct Answer
    A. Thermal energy
    Explanation
    Thermal energy is the correct answer because it is a form of energy that is transferred by a difference in temperature. It refers to the internal energy of an object or a system, and it is related to the motion and vibration of particles within the object or system. When there is a temperature difference between two objects or systems, thermal energy flows from the object or system with higher temperature to the one with lower temperature.

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  • 44. 

    The unit for work

    • N-m/sec

    • Newton

    • Joules

    • Watt

    Correct Answer
    A. Joules
    Explanation
    Joules is the correct answer because it is the unit used to measure work. Work is defined as the amount of energy transferred by a force over a distance. The joule is a derived unit in the International System of Units (SI) and is equivalent to the amount of work done when a force of one newton is applied over a distance of one meter. Therefore, joules are the appropriate unit for measuring work.

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  • 45. 

    The Color Part Of The Eye That Regualtes Light

    • Iris

    • Converging

    • Diverging

    • Focal Point

    • Acustics

    Correct Answer
    A. Iris
    Explanation
    The iris is the correct answer because it is the part of the eye that regulates the amount of light entering the eye. It is a circular, colored membrane located between the cornea and the lens. The iris contains muscles that can contract or expand to adjust the size of the pupil, controlling the amount of light that reaches the retina. This helps to protect the sensitive retina from excessive light and allows for optimal vision in different lighting conditions.

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  • 46. 

    Temperature can be described as

    • Heat

    • A measure of the average kinetic energy of the molecules of a substance

    • A fluid that flows between a hot and cold object

    • A physical quantity measured in calories

    • Energy transfer as a result of a temperature difference

    Correct Answer
    A. A measure of the average kinetic energy of the molecules of a substance
    Explanation
    Temperature can be described as a measure of the average kinetic energy of the molecules of a substance. This means that temperature is a measure of how fast the molecules are moving on average. The higher the temperature, the faster the molecules are moving, and vice versa. This concept is important in understanding how heat is transferred between objects, as temperature differences drive the flow of thermal energy. Temperature is not a fluid that flows between objects, nor is it a physical quantity measured in calories.

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  • 47. 

    How much heat do you have to add to 4.0 kg of water to raise its temp tfrom 10 C to 20 C?

    • 20 kcal

    • 40 kcal

    • 10 kcal

    • 4.0 kcal

    • None

    Correct Answer
    A. 40 kcal
    Explanation
    To calculate the amount of heat needed to raise the temperature of water, we can use the formula Q = mcΔT, where Q is the heat energy, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature. Given that the mass of water is 4.0 kg, the specific heat capacity of water is approximately 1 calorie/gram°C, and the change in temperature is 20°C - 10°C = 10°C, we can substitute these values into the formula. Converting kcal to calories, we find that the heat energy required is 4.0 kg * 1 calorie/gram°C * 10°C = 40 kcal.

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  • 48. 

    Which of the waves below is not a transverse wave?

    • A sound wave

    • A water wave

    • An electromagnetic wave

    • A plucked standing wave on a string

    • Light

    Correct Answer
    A. A sound wave
    Explanation
    A sound wave is not a transverse wave because it is a longitudinal wave. In a transverse wave, the particles of the medium vibrate perpendicular to the direction of wave propagation, while in a longitudinal wave, the particles vibrate parallel to the direction of wave propagation. In a sound wave, the particles of the medium (such as air or water) vibrate back and forth in the same direction as the wave is moving, creating compressions and rarefactions. Therefore, a sound wave does not exhibit the characteristics of a transverse wave.

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  • 49. 

    Consider a closed wire loop in the presence of a bar magnet. A current can be produced in he loop if

    • The wire loop rotates

    • The bar magnet rotates

    • The wire is held fixed but the bar magnet moves

    • All

    • None

    Correct Answer
    A. All
    Explanation
    In this scenario, a current can be produced in the wire loop in all of the given situations. When the wire loop rotates, the changing magnetic field induces a current in the loop. Similarly, when the bar magnet rotates, the changing magnetic field also induces a current. Finally, if the wire is held fixed but the bar magnet moves, the changing magnetic field again induces a current in the wire loop. Therefore, all of the given options can result in the production of a current in the wire loop.

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  • Apr 22, 2024
    Quiz Edited by
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  • Apr 28, 2018
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