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Class 9 is Matter Around us Pure MCQ for Students
In which of the following states are intermolecular attractions the weakest?
a) Solids
b) Gases
c) Liquids
d) Plasma
Option b – Gases
How can a gas be converted into a liquid?
a) By increasing the temperature
b) By reducing the pressure
c) By increasing pressure and lowering temperature
d) None of these
Option b – By reducing the pressure
The process of changing vapor into liquid is known as:
a) Condensation
b) Evaporation
c) Sublimation
d) Fusion
Option a – Condensation
At identical pressure and temperature, which gas has the highest kinetic energy?
a) Hydrogen
b) Oxygen
c) Methane
d) All have equal kinetic energy
Option d – All have equal kinetic energy
Which phase of matter remains more stable at low temperatures?
a) Solid
b) Liquid
c) Gas
d) None of these
Option a – Solid
A material without a definite shape or volume exists in which state?
a) Solid
b) Liquid
c) Gas
d) None of these
Option c – Gas
When water freezes into ice, the process is accompanied by:
a) Absorption of heat
b) Release of heat
c) First absorbs, then releases heat
d) Initially releases, then absorbs heat
Option d – Initially releases, then absorbs heat
What is a typical feature of gases?
a) Gases are completely non-rigid
b) Gases can’t be compressed
c) Gas particles are fixed in place
d) Gases have high mass per unit volume
Option a – Gases are completely non-rigid
Which of the following does not undergo sublimation?
a) Coconut oil
b) Iodine
c) Naphthalene balls
d) Camphor
Option a – Coconut oil
Which statement is incorrect for liquids?
a) Their particles are loosely arranged
b) They flow easily
c) They cannot be compressed
d) They take the shape of their container
Option c – They cannot be compressed
Changing gas into liquid is referred to as:
a) Condensation
b) Freezing
c) Sublimation
d) Fusion
Option a – Condensation
At 4°C under 1 atm pressure, which of the following is true?
a) Water has the least density
b) Water reaches its highest density
c) The mass of water increases
d) Water has the smallest volume
Option a – Water has the least density
Why does your palm feel cold when acetone or perfume is applied?
a) They have high boiling points
b) Their freezing point is very low
c) They absorb heat from your skin and evaporate
d) They lose heat while evaporating
Option c – They absorb heat from your skin and evaporate
Why do sugar crystals disappear in water?
a) They are extremely tiny
b) They occupy the spaces between water molecules
c) They constantly move
d) They have no color
Option b – They occupy the spaces between water molecules
Which substance listed below is not a true solid?
a) Wood
b) Glass
c) Sponge
d) Rubber band
Option c – Sponge
In which direction do particles in gases move?
a) Around a fixed point
b) In circular motion
c) Along a horizontal path
d) In all directions
Option d – In all directions
Which statement describes gas particles best?
a) Widely spaced and moving rapidly
b) Packed tightly and vibrating
c) Stationary and close together
d) Far apart and moving slowly
Option a – Widely spaced and moving rapidly
What does the boiling point of a substance depend on?
a) Temperature
b) Pressure
c) Volume
d) All of these
Option a – Temperature
Why can large amounts of CNG be stored in small containers?
a) It catches fire easily
b) It’s widely available
c) It can be highly compressed
d) It has a low mass per unit volume
Option c – It can be highly compressed
A type of matter that maintains volume but not shape is best represented by:
a) Hydrogen
b) Milk
c) Steel
d) None
Option b – Milk
The transformation of a liquid into gas below its boiling temperature is known as:
a) Melting
b) Boiling
c) Condensation
d) Evaporation
Option d – Evaporation
The transition from gaseous to liquid state is called:
a) Condensation
b) Evaporation
c) Melting
d) Freezing
Option a – Condensation
Which of the following is not a characteristic of liquids?
a) Definite shape
b) Definite volume
c) Definite mass
d) Incompressibility
Option a – Definite shape
Which state of matter cannot be compressed?
a) Solid
b) Liquid
c) Gas
d) Molecules
Option a – Solid
The highest expansion upon heating is observed in:
a) Liquids
b) Gases
c) Solids
d) Condensation
Option b – Gases
Matter is fundamentally made up of:
a) Particles
b) Compounds
c) Gases
d) Solids
Option a – Particles
What type of mixture is a suspension categorized as?
a) Homogeneous mixture
b) Heterogeneous mixture
c) Colloid
d) True solution
Option b – Heterogeneous mixture
In a mixture, the component present in the lesser amount is called:
a) Solvent
b) Dispersed phase
c) Dispersion medium
d) All of these
Option b – Dispersed phase
Which among the following is considered an emulsion?
a) Milk
b) Face cream
c) Both a and b
d) Shaving cream
Option c – Both a and b
In colored gemstones, what acts as the dispersion medium?
a) Solid
b) Liquid
c) Gas
d) Both b and c
Option a – Solid
What method is suitable for separating acetone from water?
a) Distillation
b) Crystallization
c) Adsorption
d) Hand picking
Option a – Distillation
What is the volume percentage of argon in the atmosphere?
a) 20.9%
b) 0.9%
c) 78.1%
d) 75%
Option b – 0.9%
Which metals were utilized during ancient times?
a) Iron
b) Lead
c) Copper
d) All of these
Option d – All of these
What do we call a substance that contains more than one component mixed in any proportion?
a) Element
b) Compound
c) Mixture
d) Atom
Option c – Mixture
Which of the following can be separated to obtain pure substances?
a) Compounds
b) Elements
c) Mixtures
d) None of these
Option c – Mixtures
A uniform combination of two or more substances is known as:
a) Solute
b) Solvent
c) Solution
d) All of these
Option c – Solution
What indicates the amount of solute dissolved in a unit volume or mass of solution?
a) Concentration
b) Solubility
c) Density
d) Volume
Option a – Concentration
If a substance does not dissolve in a solvent and remains visibly suspended, it is termed a: ( Class 9 is Matter Around us Pure MCQ )
a) Solution
b) Suspension
c) Colloid
d) True solution
Option b – Suspension
A bar magnet is placed perpendicular to a uniform magnetic field. To reduce the torque on the magnet to one-fourth, the magnet should be rotated by:
a) 32.6°
b) 45°
c) 58.2°
d) 75.5°
Option d – 75.5°
Assertion: A magnet loses its magnetic property upon heating.
Reason: Heating increases thermal energy, aligning the elementary magnets in a closed loop.
a) Both assertion and reason are true; reason correctly 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 a – Both assertion and reason are true; reason correctly explains the assertion
The work function of aluminum is 4.2 eV. What potential difference is needed to stop the most energetic photoelectrons emitted by light of 2000 Å?
a) 1.31 V
b) 2.02 V
c) 2.98 V
d) 3.74 V
Option b – 2.02 V
The de Broglie wavelength of a particle varies: ( Class 9 is Matter Around us Pure MCQ )
a) Directly with mass
b) Directly with momentum
c) Inversely with momentum
d) Independently of momentum
Option c – Inversely with momentum
Based on domain theory, a magnetic domain is defined as: ( Class 9 is Matter Around us Pure MCQ )
a) A region with unpaired electrons
b) An area where electrons create vacancies in inner shells
c) A region magnetized to its maximum level
d) A region with the strongest magnetic field
Option c – A region magnetized to its maximum level
In ferromagnetic substances, which factor does not influence hysteresis energy loss?
a) Volume of the material
b) Surface area
c) Duration of current flow
d) All of the above
Option b – Surface area
In a photoelectric experiment, what happens if the collector plate’s potential is zero compared to the emitter? ( Class 9 is Matter Around us Pure MCQ )
a) No current will flow
b) Maximum current flows
c) Formation of a space charge
d) Electrons are not emitted
Option c – Formation of a space charge
A straight-line relationship between temperature and inverse susceptibility in paramagnets indicates: ( Class 9 is Matter Around us Pure MCQ )
a) Paramagnetic materials have positive susceptibility
b) They lose magnetism with increased temperature
c) Every atom in the material has a magnetic dipole
d) Their magnetism increases with temperature
Option b – They lose magnetism with increased temperature
A compass needle near a magnet aligns due to: ( Class 9 is Matter Around us Pure MCQ )
a) Force and magnetic meridian
b) Force and field lines
c) Torque and magnetic meridian
d) Torque and magnetic field lines
Option d – Torque and magnetic field lines
In Davisson-Germer’s experiment, rotating the detector shows intensity of electrons: ( Class 9 is Matter Around us Pure MCQ )
a) Remains unchanged
b) Continuously rises
c) Continuously decreases
d) Peaks, then drops, and rises again
Option d – Peaks, then drops, and rises again
If copper’s threshold wavelength is 2750 Å, what’s the maximum energy of photoelectrons emitted by 1500 Å light?
a) 3.767 eV
b) 4.107 eV
c) 5.13 eV
d) 6 eV
Option a – 3.767 eV
For the equation M = NIAñ to apply to a current loop, it must be:
a) Flat, regular, and closed
b) Flat and irregular
c) Flat and closed
d) Flat, irregular, and closed
Option c – Flat and closed
Which graph does not display a constant slope? ( Class 9 is Matter Around us Pure MCQ )
a) Photoelectric current vs light intensity
b) Stopping potential vs frequency
c) Photoelectric current vs collector potential
d) Maximum K.E. vs frequency
Option c – Photoelectric current vs collector potential
Assertion: Below threshold frequency, photoelectric emission doesn’t happen.
Reason: If frequency is below threshold, K.E. of photoelectrons is zero.
a) Both are true and reason explains assertion
b) Both are true but reason doesn’t explain assertion
c) Assertion is true, reason is false
d) Assertion is false, reason is true
Option c – Assertion is true, reason is false
Frequency of light affects: ( Class 9 is Matter Around us Pure MCQ )
a) Only energy
b) Only color
c) Both energy and color
d) Only intensity
Option c – Both energy and color
Assertion: North pole of dip needle dips downward in Northern Hemisphere.
Reason: Earth’s magnetic north pole is in the north.
a) Both true, and reason explains assertion
b) Both true, but reason doesn’t explain
c) Assertion true, reason false
d) Assertion false, reason true
Option c – Assertion true, reason false
If a loop with current appears clockwise to an observer, its magnetic moment points: ( Class 9 is Matter Around us Pure MCQ )
a) Perpendicular to loop, away from observer
b) Perpendicular to loop, toward observer
c) Parallel to loop, away from observer
d) Parallel to loop, toward observer
Option a – Perpendicular to loop, away from observer
Maximum saturation current is achieved when: ( Class 9 is Matter Around us Pure MCQ )
a) Light intensity is highest
b) Both intensity and frequency are highest
c) Frequency is highest, intensity doesn’t matter
d) Frequency exceeds threshold and intensity is maximum
Option d – Frequency exceeds threshold and intensity is maximum
Given equal kinetic energy, which particle has the smallest de Broglie wavelength? ( Class 9 is Matter Around us Pure MCQ )
a) Electron
b) Proton
c) Helium nucleus
d) Neutron
Option c – Helium nucleus
The brightness of light is determined by: ( Class 9 is Matter Around us Pure MCQ )
a) Speed of photons
b) Quantity of photons
c) Frequency of photons
d) Photon color
Option b – Quantity of photons
In photoelectric emission, what is not conserved? ( Class 9 is Matter Around us Pure MCQ )
a) Energy
b) Momentum
c) Number of photons
d) None
Option c – Number of photons
The stopping potential depends on:
a) Angle of incident radiation
b) Light intensity
c) Type of material
d) Not influenced by intensity
Option d – Not influenced by intensity
What is true about the speed of photons hitting a metal? ( Class 9 is Matter Around us Pure MCQ )
a) Same for all photons
b) Same if frequency is same
c) Same if intensity is same
d) None of the above
Option d – None of the above
According to wave theory, photoelectric effect cannot explain: ( Class 9 is Matter Around us Pure MCQ )
a) Instant photoelectron release
b) Absence of threshold frequency
c) Independence of K.E. from intensity
d) Dependence of K.E. on frequency
Option b – Absence of threshold frequency
If photoelectrons have 2.1 eV K.E. and work function is 1.4 eV, the wavelength of light is:
a) 2896 Å
b) 3552 Å
c) 3100 Å
d) 3767 Å
Option b – 3552 Å
When two identical balls have equal de Broglie wavelengths, it implies: ( Class 9 is Matter Around us Pure MCQ )
a) Their momenta are equal
b) Their masses are equal
c) Their velocities are equal
d) All the above
Option d – All the above
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