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States of Matter JEE Mains Questions for JEE Students
Why does water boil at a lower temperature at higher altitudes?
(a) Because atmospheric pressure is lower
(b) Due to lower external temperature
(c) Because latent heat is reduced
(d) None of the above
Option a – Because atmospheric pressure is lower
Which among the following metals has the lowest melting point?
(a) Lead
(b) Zinc
(c) Silver
(d) Tin
Option d – Tin
What is the temperature of absolute zero, below which temperature cannot be reduced?
(a) 0°C
(b) -273 K
(c) -273°C
(d) -300°C
Option c – -273°C
Which chemical is commonly used in automobile engines to lower the freezing point of water?
(a) Ethylene glycol
(b) Propanoic acid
(c) Glutamic acid
(d) Glycolic acid
Option a – Ethylene glycol
Why is ethylene glycol added to car radiators in winter?
(a) To reduce water’s viscosity
(b) To lower water’s freezing point
(c) To decrease water’s boiling point
(d) To reduce the specific heat of water
Option b – To lower water’s freezing point
What is the term for the maximum temperature at which a gas can be converted into a liquid by pressure?
(a) Boyle’s temperature
(b) Critical temperature
(c) Liquefaction temperature
(d) Inversion temperature
Option b – Critical temperature
What could be the melting point of iron?
(a) 25°C
(b) 37°C
(c) 500°C
(d) 1500°C
Option d – 1500°C
Which of the following statements are correct about gases?
I. A real gas behaves like an ideal gas when it is highly diluted.
II. Only monoatomic gases are ideal.
III. An ideal gas doesn’t undergo phase change.
(a) I and II
(b) I and III
(c) II and III
(d) I, II and III
Option b – I and III
If a location’s temperature is 113°F, what would be its equivalent in Kelvin?
(a) 318 K
(b) 45 K
(c) 62.8 K
(d) 335.8 K
Option a – 318 K
Why do two pieces of ice fuse into one when pressed?
(a) Pressure lowers the melting point of ice
(b) Pressure raises the melting point of ice
(c) Melting point remains the same with pressure
(d) Ice always melts at 0°C
Option a – Pressure lowers the melting point of ice
What is the term for the phase change from liquid to gas?
(a) Precipitation
(b) Vaporization
(c) Decantation
(d) Condensation
Option b – Vaporization
Which factor increases the rate of evaporation?
(a) Increase in surface area
(b) Higher humidity
(c) Reduced wind speed
(d) Lower temperature
Option a – Increase in surface area
What affects the pressure exerted by a liquid at the bottom of a container?
(a) Area of the base
(b) Height of the liquid column
(c) Pressure remains the same regardless of height
(d) Pressure is independent of both area and height
Option b – Height of the liquid column
Which of the following statements about evaporation are true?
I. Cooling happens during evaporation.
II. Evaporation can occur at any temperature, while boiling needs a fixed boiling point.
III. Evaporation occurs only at the surface.
(a) Only I
(b) I and II
(c) II and III
(d) I, II and III
Option d – I, II and III
Which one of the following does not decrease with increasing temperature?
(a) Surface tension
(b) Viscosity
(c) Density
(d) Vapour pressure
Option d – Vapour pressure
What principle does a pressure cooker use to cook food faster?
(a) Increases the boiling point of water using pressure
(b) Softens food with pressure only
(c) Combines pressure and heat to soften food
(d) Keeps food in steam longer
Option a – Increases the boiling point of water using pressure
Under which scientific law are soda bottles sealed under high pressure to dissolve more CO₂?
(a) Raoult’s Law
(b) Henry’s Law
(c) Ohm’s Law
(d) Dalton’s Law
Option b – Henry’s Law
The constant ratio of nitrogen to hydrogen in ammonia from any source supports which chemical law?
(a) Law of Reciprocal Proportions
(b) Law of Constant Proportions
(c) Law of Multiple Proportions
(d) None of the above
Option b – Law of Constant Proportions
Assertion: All molecules of an ideal gas move at the same speed.
Reason: Ideal gas molecules experience no intermolecular forces.
(a) Both assertion and reason are true, and reason explains the assertion
(b) Both are true, but reason does not explain the assertion
(c) Assertion is true, reason is false
(d) Assertion is false, reason is true
Option c – Assertion is true, reason is false
Which gemstone contains the element beryllium?
(a) Topaz
(b) Emerald
(c) Ruby
(d) Blue sapphire
Option b – Emerald
What is commonly known as dry ice?
(a) Solid carbon dioxide
(b) Liquid carbon dioxide
(c) Liquid nitrogen
(d) Liquid ammonia
Option a – Solid carbon dioxide
How can a mixture of acetone and alcohol be separated?
(a) Filtration
(b) Separating funnel
(c) Fractional crystallisation
(d) Fractional distillation
Option d – Fractional distillation
When milk is churned, cream separates due to
(a) Gravitational force
(b) Frictional force
(c) Centrifugal force
(d) Centripetal force
Option c – Centrifugal force
What technique is used to separate small, insoluble particles from a liquid?
(a) Crystallisation
(b) Fractional distillation
(c) Centrifugation
(d) Decantation
Option d – Decantation
Chromatography works on which principle?
(a) Different solubilities in different mediums
(b) Same solubilities in same medium
(c) Different solubilities in the same medium
(d) Both (a) and (b)
Option d – Both (a) and (b)
Glass and plastic are examples of
(a) Amorphous solids
(b) Supercooled liquids
(c) Both (a) and (b)
(d) None of the above
Option c – Both (a) and (b)
Quartz, used for its piezoelectric properties, is composed of which element?
(a) Mercury
(b) Silicon
(c) Titanium
(d) Tin
Option b – Silicon
Amorphous silica is primarily used in which of the following?
(a) Photovoltaic cells
(b) Conductivity cells
(c) Standard hydrogen electrodes
(d) None of the above
Option a – Photovoltaic cells
Which of the following statements about carbon is incorrect?
(a) Diamonds have carbon atoms bonded through single carbon-carbon bonds
(b) Graphite’s layers are connected by weak Van der Waals forces
(c) Graphite consists of carbon atoms arranged in hexagonal layers
(d) Graphite’s layers are held together by carbon-carbon single bonds
Option d – Graphite’s layers are held together by carbon-carbon single bonds
Which of the following statements does not apply to diamond?
(a) Diamond is harder than graphite
(b) Diamond and graphite have the same percentage of carbon
(c) Diamond conducts electricity better than graphite
(d) Diamond has varying carbon-carbon distances in all directions
Option c – Diamond conducts electricity better than graphite
Amorphous solids are best described as
(a) Supercooled liquids
(b) Supercooled solids
(c) Covalent networks
(d) Molecular crystals
Option a – Supercooled liquids
What is used to eliminate green tint from glass?
(a) Silicon dioxide
(b) Titanium dioxide
(c) Sulphur dioxide
(d) Manganese dioxide
Option d – Manganese dioxide
At extremely low temperatures, oxygen solidifies into a crystalline form. How would you classify this solid?
(b) Molecular crystal
(c) Metallic solid
(d) Ionic solid
Option b – Molecular crystal
In which type of molecule is the atom and molecule essentially the same?
(a) Diatomic molecule
(b) Polyatomic molecule
(c) Monoatomic molecule
(d) Triatomic molecule
Option c – Monoatomic molecule
Which of the following elements is monoatomic?
(a) Hydrogen
(b) Sulphur
(c) Phosphorus
(d) Helium
Option d – Helium
Which of the following is not monoatomic?
(a) Copper
(b) Helium
(c) Iodine
(d) Barium
Option c – Iodine
Which of the following are homogeneous mixtures of two or more substances?
(a) Amalgams
(b) Solutions
(c) Enzymes
(d) Emulsions
Option b – Solutions
Identify the correct statement regarding compounds and mixtures:
(a) Both statements are correct and the second explains the first
(b) Both statements are correct but unrelated
(c) Only the first statement is true
(d) Only the second statement is true
Option c – Only the first statement is true
How can iodine be separated from a mixture of iodine and potassium chloride?
(a) Sedimentation
(b) Filtration
(c) Sublimation
(d) Distillation
Option c – Sublimation
Which is considered the newest discovered state of matter?
(a) Solid
(b) Bose-Einstein condensate
(c) Plasma
(d) Liquid
Option b – Bose-Einstein condensate
Bose-Einstein condensate represents
(a) Solid phase
(b) Fifth state of matter
(c) Plasma state
(d) Condensed matter
Option b – Fifth state of matter
Arrange the three common states of matter in order of increasing compressibility:
(a) Liquid < Gas < Solid
(b) Solid < Liquid < Gas
(c) Gas < Liquid < Solid
(d) Solid < Gas < Liquid
Option b – Solid < Liquid < Gas
Which statement about pressure is inaccurate?
(a) Pressure is measured in metres
(b) Matter is composed of tiny particles
(c) Evaporation results in cooling
(d) Brass is a blend of zinc and copper
Option a – Pressure is measured in metres
Regarding mixtures, which statement is valid? ( States of Matter JEE Mains Questions )
(a) Only substances separable by physical methods are mixtures
(b) Dissolved salt in water can be separated by evaporation
(c) Both of the above
(d) Neither of the above
Option b – Dissolved salt in water can be separated by evaporation
At absolute zero, which energy form in gas becomes zero?
(a) Potential energy
(b) Kinetic energy
(c) Vibrational energy
(d) None of the above
Option b – Kinetic energy
Which gas has the highest diffusion rate? ( States of Matter JEE Mains Questions )
(a) Oxygen
(b) Carbon dioxide
(c) Ammonia
(d) Nitrogen
Option c – Ammonia
In refrigeration, the gas becomes cooler when
(a) It flows through pipes
(b) It is heated
(c) It is compressed
(d) It is allowed to expand
Option d – It is allowed to expand
What happens when an ethylene-filled balloon is released into hydrogen? ( States of Matter JEE Mains Questions )
(a) It shrinks
(b) It expands
(c) It bursts
(d) It remains the same
Option b – It expands
Identify the transport properties from the list:
(a) All listed properties
(b) Viscosity, thermal conductance, diffusion
(c) Viscosity, thermal conductance
(d) Thermal conductance, diffusion
Option b – Viscosity, thermal conductance, diffusion
Which statements about liquid vs solid particles are accurate? ( States of Matter JEE Mains Questions )
(a) Only liquids diffuse faster
(b) Only liquids have more free space
(c) Both statements are correct
(d) Neither statement is correct
Option c – Both statements are correct
Assertion: Every liquid conducts electricity.
Reason: Under specific low pressure and high voltage, liquids conduct.
(a) Both are correct and the reason explains the assertion
(b) Both are correct but unrelated
(c) Only assertion is true
(d) Assertion is false, reason is true
Option d – Assertion is false, reason is true
The idea that nothing can be created from nothing aligns with which scientific law? ( States of Matter JEE Mains Questions )
(a) Law of Constant Proportions
(b) Law of Conservation of Mass-Energy
(c) Law of Multiple Proportions
(d) Law of Reciprocal Proportions
According to which law do gases react in volumes that are in simple ratios?
(a) Law of Mass Action
(b) Law of Multiple Proportions
(c) Law of Reciprocal Proportions
(d) Law of Combining Volumes
Option d – Law of Combining Volumes
When temperature is constant, pressure and volume have an inverse relationship. This is ( States of Matter JEE Mains Questions )
(a) Gay-Lussac’s Law
(b) Charles’s Law
(c) Boyle’s Law
(d) Pressure Law
Option c – Boyle’s Law
Which law states that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules?
(a) Avogadro’s Law
(b) Boyle’s Law
(c) Ohm’s Law
(d) Charles’s Law
Option a – Avogadro’s Law
What principle says that gases at the same temperature and pressure contain the same number of molecules? ( States of Matter JEE Mains Questions )
(a) Avogadro’s Hypothesis
(b) Gay-Lussac’s Hypothesis
(c) Planck’s Hypothesis
(d) Kirchhoff’s Hypothesis
Option a – Avogadro’s Hypothesis
An ideal gas obeys which relationship?
(a) Ideal Gas Law
(b) Boyle’s Law
(c) Charles’s Law
(d) Avogadro’s Law
Option a – Ideal Gas Law
In the gas law equation PV = nRT, what does V represent? ( States of Matter JEE Mains Questions )
(a) Volume of n moles of gas
(b) Volume of any quantity of gas
(c) Volume of one mole of gas
(d) Volume of one gram of gas
Option a – Volume of n moles of gas
Dense air at sea level demonstrates which principle?
(a) Boyle’s Law
(b) Charles’s Law
(c) Dalton’s Law
(d) Avogadro’s Law
Option a – Boyle’s Law
Which of the following does not describe an ideal gas accurately? ( States of Matter JEE Mains Questions )
(a) All gas particles have identical speed
(b) Kinetic energy of molecules varies
(c) Molecules have no potential energy
(d) No intermolecular forces exist
Option a – All gas particles have identical speed
A helium balloon rises in the air because
(a) Air pushes the balloon upward
(b) Helium has no weight
(c) Helium is less dense than air
(d) Helium exerts a downward force on air
Option c – Helium is less dense than air
When a gas is compressed isothermally, what occurs? ( States of Matter JEE Mains Questions )
(a) Molecular speeds drop
(b) Molecular speeds rise
(c) Molecular collisions increase
(d) Molecular collisions decrease
Option c – Molecular collisions increase
The mass of water vapor in a given volume of air is known as
(a) Relative humidity
(b) Specific humidity
(c) Absolute humidity
(d) Variable humidity
Option c – Absolute humidity
What does the melting point of a substance reveal? ( States of Matter JEE Mains Questions )
(a) Strength of intermolecular attraction
(b) Strength of intermolecular repulsion
(c) Molecular weight
(d) Size of the molecule
Option c – Molecular weight
Glass is not considered a true compound because
(a) Glass lacks a definite melting point
(b) Glass has no molecular formula
(c) Both statements above are true and related
(d) Both are true but unrelated
Option a – Glass lacks a definite melting point
What is the unit of viscosity?
(a) Poise
(b) Dyne/cm
(c) Joule/m²
(d) Joule
Option a – Poise
Which of the following is liquid at room temperature? ( States of Matter JEE Mains Questions )
(a) Mercury
(b) Lead
(c) Sodium
(d) Calcium
Option a – Mercury
When water boils vigorously, the bubbles are primarily made of
(a) Air
(b) Hydrogen
(c) Hydrogen and oxygen
(d) Water vapor
Option d – Water vapor
What happens to the boiling point of a liquid when atmospheric pressure is lowered? ( States of Matter JEE Mains Questions )
(a) It increases
(b) It decreases
(c) It stays the same
(d) It takes longer to boil
Option b – It decreases
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