Physics Ultimate Exam Trivia!

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  • 1/69 Questions

    Friction between moving parts of machine causes

    • Heat
    • Light
    • Energy
    • Oil
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About This Quiz

Dive into the 'Physics Ultimate Exam Trivia!' to challenge and refine your understanding of fundamental physics concepts. This quiz assesses your knowledge on units, physical quantities, methods to reduce friction, and more, enhancing your skills in a practical and engaging way.

Physics Ultimate Exam Trivia! - Quiz

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  • 2. 

    Gold-leaf electroscope is used to

    • Detect the presence of charges on a body

    • Measure potential differences

    • Determine the magnetic flux density of a field

    • Measure current

    Correct Answer
    A. Detect the presence of charges on a body
    Explanation
    The gold-leaf electroscope is a device used to detect the presence of charges on a body. When a charged object is brought close to the electroscope, the gold leaves repel each other due to the like charges. This indicates the presence of charges on the body. The greater the charge on the body, the greater the separation of the gold leaves. Therefore, the gold-leaf electroscope is commonly used in experiments and demonstrations to detect the presence of electric charges.

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  • 3. 

    Different types of surfaces create different amount of friction

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Friction is a force that opposes motion and it depends on the nature of the surfaces in contact. Different surfaces have different textures and properties, which can affect the amount of friction they generate. For example, rough surfaces tend to create more friction compared to smooth surfaces. Therefore, it is true that different types of surfaces create different amounts of friction.

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  • 4. 

    Which of the following material is more elastic?

    • Rubber

    • Glass

    • Steel

    • Wood

    Correct Answer
    A. Rubber
    Explanation
    *##*Correct*##*Wrong

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  • 5. 

    Which of the following statements about liquids is correct? They

    • Are elastic  

    • Contract when heated

    • Flow

    • Have definite shape

    Correct Answer
    A. Flow
    Explanation
    Liquids have the ability to flow, which means they can move and change shape when a force is applied. Unlike solids, liquids do not have a definite shape and can take the shape of their container. This characteristic allows liquids to flow and adapt to different environments, making the statement "flow" the correct answer.

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  • 6. 

    Which of the following is NOT a method to reduce friction?

    • By Lubrication

    • By Polishing

    • Throwing sand on the Ground

    • None of the above

    Correct Answer
    A. Throwing sand on the Ground
    Explanation
    Throwing sand on the ground does not reduce friction; instead, it increases it. When sand is thrown on the ground, it creates roughness and increases the contact area between surfaces, leading to more friction. Lubrication, on the other hand, reduces friction by providing a layer between surfaces, reducing direct contact. Polishing also reduces friction by making surfaces smoother, reducing the roughness that causes friction. Therefore, throwing sand on the ground is not a method to reduce friction.

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  • 7. 

    Which one is not a dimension?

    • Length

    • Mass

    • Time

    • Kelvin

    Correct Answer
    A. Kelvin
    Explanation
    *##*Correct*##*Wrong

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  • 8. 

    A metal rod of length 100cm is heated through 1000C, calculate the change in length of the rod. [Linear expansivity of material of the rod is 3 x 10-5K-1]

    • 4mm

    • 3mm

    • 2mm

    • 1mm

    Correct Answer
    A. 3mm
    Explanation
    When a metal rod is heated, it expands due to thermal expansion. The change in length of the rod can be calculated using the formula:

    ΔL = αLΔT

    Where ΔL is the change in length, α is the linear expansivity of the material, L is the original length of the rod, and ΔT is the change in temperature.

    In this case, the linear expansivity (α) is given as 3 x 10-5K-1, the original length (L) is 100cm, and the change in temperature (ΔT) is 1000C.

    Using the formula, we can calculate:

    ΔL = (3 x 10-5K-1) * (100cm) * (1000C) = 3mm

    Therefore, the change in length of the rod is 3mm.

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  • 9. 

    Which of the following has no units?

    • Thermal capacity

    • Tensile strain 

    • Acceleration

    • Impulse

    Correct Answer
    A. Tensile strain 
    Explanation
    Tensile strain is a dimensionless quantity that represents the change in length of an object divided by its original length. Since it is a ratio of lengths, it does not have any units. The other options, thermal capacity, acceleration, and impulse, all have units associated with them. Thermal capacity is measured in units of energy per degree Celsius, acceleration is measured in units of meters per second squared, and impulse is measured in units of Newton-seconds.

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  • 10. 

    The instrument of measurement of weight is _____

    • Beam balance

    • Spring balance

    • Lever arm balance

    • Equal arm balance

    Correct Answer
    A. Spring balance
    Explanation
    A spring balance is an instrument used to measure weight. It consists of a coiled spring that stretches when a weight is attached to it. The amount of stretch in the spring is directly proportional to the weight applied, allowing for an accurate measurement of weight. This makes the spring balance a commonly used tool in various industries and everyday life for measuring the weight of objects.

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  • 11. 

    What volume of alcohol with a density of 8.0 x 102kgm-3 will have the same mass as 4.2m3 of petrol whose density is 7.2 x 102kgm-3?

    • 1.4 m3

    • 3.6 m3

    • 4.9 m3

    • 5.0 m3

    Correct Answer
    A. 3.6 m3
    Explanation
    The question asks for the volume of alcohol that has the same mass as 4.2 m3 of petrol. To find this, we need to compare the densities of alcohol and petrol. The density of alcohol is given as 8.0 x 102 kg/m3, and the density of petrol is given as 7.2 x 102 kg/m3. Since the density of alcohol is greater than the density of petrol, we can conclude that alcohol is denser than petrol. Therefore, to have the same mass as 4.2 m3 of petrol, we would need a smaller volume of alcohol. The only option that is smaller than 4.2 m3 is 3.6 m3, so it is the correct answer.

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  • 12. 

    A sledge is pulled 10m by a force 40N.what is the work done?

    • 400 Nm

    • 650 Nm

    • 657 Nm

    • 740 Nm

    Correct Answer
    A. 400 Nm
    Explanation
    The work done is calculated by multiplying the force applied to an object by the distance it is moved. In this case, the force applied is 40N and the distance moved is 10m. Therefore, the work done is 40N x 10m = 400 Nm.

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  • 13. 

    1. A car fuse marked 3A operates optimally on 12V battery. calculate the resistance of the fuse

    • 3 4Ω

    • 4Ω

    • 6Ω

    • 9Ω

    Correct Answer
    A. 4Ω
    Explanation
    *##*correct*##*incorrect

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  • 14. 

    An engine raises 100kg of water through a height 60m in 20sec.what is the power of the engine. (g=10m/s2)

    • 8 KW

    • 3 KW

    • 2 KW

    • 1.4 KW

    Correct Answer
    A. 3 KW
    Explanation
    *##*Correct*##*Incorrect

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  • 15. 

    The property of a material by which it can be beaten or rolled into thin sheets, is called

    • Elasticity

    • Plasticity

    • Ductility

    • Malleability

    Correct Answer
    A. Malleability
    Explanation
    *##*correct*##*wrong

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  • 16. 

    Which of the following statements about matter is not correct

    • Molecules of solids move more freely than molecules of liquids and gases

    • Molecules of solids are more closely packed than those of the liquids

    • Energy is required to break the intermolecular forces of attraction between molecules

    • Molecules of liquids move about within the liquid and they are in constant random motion

    Correct Answer
    A. Molecules of solids move more freely than molecules of liquids and gases
    Explanation
    The statement "Molecules of solids move more freely than molecules of liquids and gases" is incorrect. In solids, molecules are tightly packed and have limited movement, whereas in liquids and gases, molecules have more freedom to move and are not as tightly packed.

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  • 17. 

    A rod of initial length 2m at a temperature of 250C is heated to 800C. Calculate the increase in length of the rod if its linear expansivity is              4.0 x 10-3k-1     

    • 0.26m

    • 0.44m

    • 0.53m

    • 0.84m

    Correct Answer
    A. 0.44m
    Explanation
    When a rod is heated, it undergoes thermal expansion, causing an increase in its length. The increase in length can be calculated using the formula ΔL = αLΔT, where ΔL is the change in length, α is the linear expansivity, L is the initial length, and ΔT is the change in temperature. In this case, the initial length (L) is 2m, the linear expansivity (α) is 4.0 x 10-3k-1, and the change in temperature (ΔT) is 800C - 250C = 550C. Plugging these values into the formula, we get ΔL = (4.0 x 10-3k-1)(2m)(550C) = 0.44m. Therefore, the increase in length of the rod is 0.44m.

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  • 18. 

    ​​​​​​_________ is the instrument of measurement of atmospheric pressure

    • Micrometer screw gauge

    • Bolometer

    • Barometer

    • Anenometer

    Correct Answer
    A. Barometer
    Explanation
    *##*Correct*##*Incorrect

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  • 19. 

    A body of mass 4kg moves through a distance 80m, calculate the work done on the body. (g=10m/s2)

    • 6.2 KJ

    • 3.2 KJ

    • 3.0 KJ

    • 1.4 KJ

    Correct Answer
    A. 3.2 KJ
    Explanation
    The work done on an object can be calculated using the formula W = F * d, where W is the work done, F is the force applied, and d is the distance over which the force is applied. In this case, the force applied can be calculated using the formula F = m * g, where m is the mass of the object and g is the acceleration due to gravity. Plugging in the given values, F = 4kg * 10m/s^2 = 40N. The work done is then calculated as W = 40N * 80m = 3200J, which is equal to 3.2 KJ.

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  • 20. 

    ​​​​​Which of the following is a not an application of surface tension

    • Absorption of ink in blotting paper

    • Rising of oil lamp wick

    • Movement of melted wax into the neck of a burning candle

    • Falling of a metal bob through water

    Correct Answer
    A. Falling of a metal bob through water
    Explanation
    The falling of a metal bob through water is not an application of surface tension because surface tension is the force that causes the surface of a liquid to behave like a stretched elastic sheet. It is responsible for phenomena such as capillary action, where liquids can rise in narrow tubes against the force of gravity. However, the falling of a metal bob through water is simply an example of an object sinking due to its own weight and the buoyant force exerted by the water. Surface tension does not play a role in this scenario.

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  • 21. 

    The evidence that matter consist of particles is illustrated by      I. Brownian motion   II. Diffusion     III. Law of definite proportions

    • I only     

    • I,II and III   

    • II and III   

    • III only

    Correct Answer
    A. I,II and III   
    Explanation
    The evidence that matter consists of particles is supported by all three options: I. Brownian motion, II. Diffusion, and III. Law of definite proportions. Brownian motion is the random movement of particles suspended in a fluid, which can only be explained if the particles are individual entities. Diffusion is the spreading out of particles from an area of high concentration to an area of low concentration, which indicates that particles are moving independently. The Law of definite proportions states that a compound always contains the same elements in the same ratio by mass, suggesting that matter is composed of discrete particles. Therefore, all three options provide evidence for the particle nature of matter.

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  • 22. 

    Candela is the unit of …………………

    • Magnetic flux

    • Intensity of electric field

    • Luminous intensity  

    • Charge

    Correct Answer
    A. Luminous intensity  
    Explanation
    Candela is the unit of luminous intensity. Luminous intensity refers to the amount of light emitted or reflected from a particular direction. It is a measure of the brightness of a light source as perceived by the human eye. The candela is defined as the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 terahertz and has a radiant intensity in that direction of 1/683 watt per steradian.

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  • 23. 

    The dimension of density is __

    • ML-3

    • MLT-2

    • LT-2

    • LT-1

    Correct Answer
    A. ML-3
    Explanation
    *##*correct*##*incorrect

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  • 24. 

    Two different materials rubbed against each other acquire opposite charges when separated. This is an example of charging by

    • Induction 

    • Friction

    • Conduction

    • Convection

    Correct Answer
    A. Friction
    Explanation
    When two different materials are rubbed against each other, the friction between them causes the transfer of electrons from one material to the other. This transfer of electrons results in one material acquiring a positive charge and the other material acquiring a negative charge. Therefore, the statement "Two different materials rubbed against each other acquire opposite charges when separated" is an example of charging by friction.

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  • 25. 

    Calculate the potential energy of Dam if the height is 200m and the mass of the water is 5kg (g=10m/s2)

    • 56 KJ

    • 50 KJ

    • 30 KJ

    • 10 KJ

    Correct Answer
    A. 10 KJ
    Explanation
    The potential energy of an object is given by the formula PE = mgh, where m is the mass, g is the acceleration due to gravity, and h is the height. In this case, the mass of the water is given as 5kg, the height is given as 200m, and the acceleration due to gravity is given as 10m/s^2. Plugging these values into the formula, we get PE = 5kg * 10m/s^2 * 200m = 10,000 J = 10 KJ. Therefore, the correct answer is 10 KJ.

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  • 26. 

    The stress in a rod is 70 N/mm2 and the modulus of elasticity is 2 x 105 N/mm2. what will be the strain in the rod?

    • 0.00052

    • 0.00035

    • 0.00030  

    • 0.00047

    Correct Answer
    A. 0.00030  
    Explanation
    *##*Correct*##*Incorrect

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  • 27. 

    MLT-2 is the dimension of ___

    • Density

    • Acceleration

    • Force

    • Time

    Correct Answer
    A. Force
    Explanation
    *##*Correct*##*Incorrect

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  • 28. 

    A metal rod of length 50cm is heated from 400C to 800C. If the linear expansivity of the material is ᾳ, calculate the increase in length of the rod (in meters) in terms of ᾳ.

    • 20 ᾳ

    • 200 ᾳ

    • 2000 ᾳ

    • 20000 ᾳ

    Correct Answer
    A. 20 ᾳ
    Explanation
    When a metal rod is heated, it undergoes thermal expansion, causing an increase in its length. The linear expansivity (α) is a measure of how much the length of a material changes with a change in temperature. In this question, the metal rod is heated from 40°C to 80°C. The increase in temperature is 80°C - 40°C = 40°C. The increase in length of the rod can be calculated using the formula ΔL = α * L * ΔT, where ΔL is the change in length, α is the linear expansivity, L is the original length of the rod, and ΔT is the change in temperature. Plugging in the given values, ΔL = ᾳ * 50cm * 40°C = 2000 ᾳ. Therefore, the increase in length of the rod is 2000 ᾳ.

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  • 29. 

    Which of the following is not a physical quantity?

    • All of the above

    • Candela

    • Henry

    • Kelvin

    Correct Answer
    A. Henry
    Explanation
    The question asks for a physical quantity that is not included in the given options. The options include "Candela," "Henry," and "Kelvin." Candela is the SI unit for luminous intensity, Henry is the SI unit for inductance, and Kelvin is the SI unit for temperature. Therefore, the correct answer is "Henry," as it is the only option that does not represent a physical quantity.

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  • 30. 

    ​​​​Which of the following statement is not true

    • Water wets glass

    • Mercury wets glass

    • Cohesion is the forces of attraction between molecules of the same substances or kind.

    • Adhesion is the force of attraction between molecules of different substances or kind

    Correct Answer
    A. Mercury wets glass
    Explanation
    The statement "Mercury wets glass" is not true because mercury does not wet glass. Wetting is the ability of a liquid to spread out and make contact with a solid surface. Mercury does not wet glass because it forms droplets on the surface instead of spreading out.

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  • 31. 

    Which of the following is a scalar quantity

    • Time

    • Displacement

    • Force

    • Pressure

    Correct Answer
    A. Time
    Explanation
    *##*Correct*##*Incorrect

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  • 32. 

    Which of the following is not a way of reducing surface tension on water

    • By adding soaps/detergents

    • By heating the liquid

    • By adding sand

    • By adding kerosene

    Correct Answer
    A. By adding sand
    Explanation
    Adding sand to water does not reduce surface tension. Surface tension is the force that causes the surface of a liquid to behave like a stretched elastic sheet. Adding soaps/detergents, heating the liquid, and adding kerosene all reduce surface tension. Soaps and detergents contain molecules that have a hydrophilic (water-attracting) and hydrophobic (water-repelling) end, which disrupts the cohesive forces between water molecules. Heating the liquid increases the kinetic energy of the molecules, weakening the intermolecular forces and reducing surface tension. Kerosene is a nonpolar substance that does not interact strongly with water, reducing surface tension. However, sand does not have any effect on surface tension as it does not interact with water molecules in a way that reduces the cohesive forces at the surface.

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  • 33. 

    In the formation of sea breeze, wind blows from

    • Sky to land

    • Sea to sky

    • Land to sea

    • Sea to land

    Correct Answer
    A. Sea to land
    Explanation
    Sea breeze is a local wind that occurs during the day near coastal areas. It is caused by the temperature difference between the land and the sea. During the day, the land heats up faster than the sea, causing the air above the land to become warmer and rise. As a result, cooler air from the sea moves in to replace the rising warm air, creating a breeze that blows from the sea to the land. Therefore, the correct answer is "sea to land".

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  • 34. 

    The ice and steam points on a mercury-in-glass thermometer are 10cm and 30cm respectively. Calculate the temperature in degree Celsius, when the mercury meniscus is at the 14cm mark

    • 20 oC

    • 30 oC

    • 34 oC

    • 70 oC

    Correct Answer
    A. 20 oC
    Explanation
    *##*Correct*##*Incorrect

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  • 35. 

    A resistor with fixed resistance value is called a

    • Resistance box

    • Standard resistor

    • Shunt

    • Multiplier

    Correct Answer
    A. Standard resistor
    Explanation
    A resistor with a fixed resistance value is called a standard resistor. This term is often used in electrical engineering to refer to a resistor that has a known and precise resistance value, which is used as a reference for measuring and calibrating other resistors or electrical circuits. Standard resistors are typically manufactured and tested to have a very low tolerance, ensuring their accuracy and reliability in various applications.

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  • 36. 

    ​​​​​​The following processes are explained by surface tension except

    • Water rising up a capillary tube

    • Bristles of a paint brush cling together when removed from water

    • Spherical droplets of water dropping from a tap

    • ​​​​​Needle floating on water.

    Correct Answer
    A. Water rising up a capillary tube
    Explanation
    Surface tension is the property of a liquid that allows it to resist external forces and minimize its surface area. It is responsible for phenomena such as the formation of droplets and the cohesion of liquid molecules. However, the process of water rising up a capillary tube is not explained by surface tension alone. This process is mainly due to capillary action, which is the result of adhesive and cohesive forces between the liquid and the walls of the tube.

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  • 37. 

    Which of the following is true of the meniscus of mercury in a capillary tube

    • The meniscus is concave

    • The meniscus is plano-concave

    • The meniscus is convex

    • The meniscus is plano-convex

    Correct Answer
    A. The meniscus is convex
    Explanation
    The meniscus of mercury in a capillary tube is convex. This means that the surface of the mercury is curved upwards at the edges, forming a rounded shape. This is due to the cohesive forces between the mercury molecules being stronger than the adhesive forces between the mercury and the glass of the capillary tube. As a result, the mercury forms a convex shape, with the highest point in the center of the meniscus.

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  • 38. 

    Land breeze occurs

    • During the day

    • As a result of heat transfer by radiation

    • As a result of heat transfer by conduction

    • As a result of heat transfer by convection

    Correct Answer
    A. As a result of heat transfer by convection
    Explanation
    Land breeze occurs as a result of heat transfer by convection. During the day, the land heats up faster than the water. This causes the air above the land to become warmer and rise, creating a low-pressure area. The cooler air over the water then moves towards the land to fill this void, resulting in a land breeze. Convection is the process of heat transfer through the movement of fluids or gases, and in this case, it explains how the warmer air rises and the cooler air moves in to replace it, causing the land breeze.

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  • 39. 

    Highly polished silvery surface are

    • Poor absorbers and poor emitters of radiation

    • Good absorbers and good emitters of radiaton

    • Good absorbers but poor emitters of radiation

    • Poor absorbers but good emitters of radiation

    Correct Answer
    A. Poor absorbers and poor emitters of radiation
    Explanation
    Highly polished silvery surfaces are poor absorbers and poor emitters of radiation because their smooth and reflective surfaces prevent them from absorbing and emitting radiation effectively. Instead, they reflect most of the radiation that comes into contact with them. This property makes them suitable for applications such as mirrors or reflective coatings, where their ability to reflect light is desired.

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  • 40. 

    A wire of cross-sectional area 0.60mm2 has a resistivity of 7.2 x 10-7ῼm. Calculate the length of the wire that will have a resistance of 3ῼ.

    • 0.25m

    • 2.50m

    • 3.60m

    • 36.00m

    Correct Answer
    A. 2.50m
    Explanation
    The resistance of a wire can be calculated using the formula R = ρ * (L/A), where R is the resistance, ρ is the resistivity, L is the length of the wire, and A is the cross-sectional area of the wire. Rearranging the formula, we have L = R * (A/ρ). Plugging in the given values, L = 3ῼ * (0.60mm2 / 7.2 x 10-7ῼm) = 2.50m. Therefore, the length of the wire that will have a resistance of 3ῼ is 2.50m.

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  • 41. 

    The body will move only when

    • Force of friction = applied force

    • Force of friction < applied force

    • Force of friction > applied force

    • All of the above

    Correct Answer
    A. Force of friction < applied force
    Explanation
    The correct answer is "Force of friction < applied force." This means that the body will move only when the force of friction, which opposes the motion, is less than the applied force. In other words, if the force of friction is greater than the applied force, the body will not move.

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  • 42. 

    A girl whose mass is 40kg walks up a flight of 20 steps each 150mm height in 10secs.find the average power developed (g=10m/s2)

    • 450 W

    • 325 W

    • 120 W

    • 12 W

    Correct Answer
    A. 120 W
    Explanation
    The average power developed can be calculated by dividing the work done by the time taken. The work done can be calculated by multiplying the force exerted (which is equal to the girl's weight, given by mass x acceleration due to gravity) by the distance covered (which is equal to the height of each step multiplied by the number of steps). The time taken is given as 10 seconds. Therefore, the average power developed is 120 W.

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  • 43. 

    Which of the following statements distinguishes thermal conduction from convection? I. Conduction requires a material medium while convection does not II. In convection, there is actual motion of hot materials, while in conduction, molecules vibrate faster about there mean positions III. Conduction takes place in solids while convection takes place in fluids.

    • I and II only

    • II and III only

    • I and III only

    • I, II and III

    Correct Answer
    A. I and II only
    Explanation
    Statement I is correct because thermal conduction requires a material medium, such as a solid or a liquid, for the transfer of heat. On the other hand, convection does not require a material medium as it involves the actual motion of hot materials, such as fluids, to transfer heat. Statement II is also correct because in conduction, heat is transferred through the vibration of molecules, which causes them to collide with neighboring molecules and transfer energy. In convection, however, there is actual motion of hot materials, such as fluids, which carry heat from one place to another. Statement III is incorrect because conduction can also take place in fluids, such as in the case of heat transfer through a metal rod immersed in a liquid.

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  • 44. 

    The force of friction depends on 

    • Nature of surface of contact

    • Materials of objects in contact

    • A & B

    • None of the Above

    Correct Answer
    A. A & B
    Explanation
    The force of friction depends on the nature of the surface of contact and the materials of objects in contact. The nature of the surface of contact refers to whether it is rough or smooth, which affects the amount of friction. The materials of objects in contact also play a role, as different materials have different coefficients of friction. Therefore, both factors, the nature of the surface and the materials of objects, determine the force of friction.

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  • 45. 

    1.  If 2 resistors of 5kΩ and 7kΩ are connected in series across a 15V battery, then the current flowing through each of the resistance should be

    • 2 mA

    • 3.6 mA

    • 5 mA

    • 1.25 mA

    Correct Answer
    A. 1.25 mA
    Explanation
    *##*Correct*##*Incorrect

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  • 46. 

    The pressure at the ice point for a constant-volume gas thermometer is 4.81 x 104 Pa while that at the steam point is 6.48 x 104 Pa. What pressure would this thermometer indicate at 500C?

    • 5.645 x 100C

    • 7.230 x 100C

    • 2.543 x 100C

    • 9.471 x 100C

    Correct Answer
    A. 5.645 x 100C
    Explanation
    *##*Correct*##*Incorrect

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  • 47. 

    The following are crystal except_____

    • Graphite

    • Ice

    • Potassium chloride

    • Sugar

    Correct Answer
    A. Sugar
    Explanation
    Sugar is not a crystal because it does not have a regular repeating pattern of molecules or ions in its structure. Graphite, ice, and potassium chloride all have a crystalline structure, meaning their molecules or ions are arranged in a repeating pattern.

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  • 48. 

    When the pointed end of an uncharged optical pin is brought near the cap of a positively charged electroscope, it is observed that the gold leaves

    • Collapse slowly

    • Vibrate

    • Are not affected

    • Diverge rapidly

    Correct Answer
    A. Collapse slowly
    Explanation
    When the pointed end of an uncharged optical pin is brought near the cap of a positively charged electroscope, the positive charges in the electroscope are attracted to the negative charges in the pin. This causes the positive charges in the electroscope to move closer to the pin, resulting in the collapse of the gold leaves. Since the pin is uncharged, there is no repulsion between the charges in the electroscope, which is why the collapse is slow rather than rapid.

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  • 49. 

    The readings on the pressure scale at the steam and ice points are 800mmHg and 300mmHg respectively. Determine the corresponding temperature in degree Celsius when it reads 450mmHg.

    • 15

    • 30

    • 45

    • 60

    Correct Answer
    A. 30
    Explanation
    The correct answer is 30. The pressure and temperature of a substance are directly proportional, according to Gay-Lussac's Law. Therefore, we can use the proportionality to find the corresponding temperature. The difference between the pressure at the steam point and the ice point is 800mmHg - 300mmHg = 500mmHg. The difference between the temperature at the steam point and the ice point is 100°C. Therefore, the temperature corresponding to a pressure of 450mmHg can be calculated using the proportion: (450mmHg - 300mmHg) / 500mmHg = (T - 30°C) / 100°C. Solving for T gives T = 30°C.

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  • Nov 16, 2023
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  • Sep 22, 2020
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