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Class 9 is Matter Around us Pure MCQ for Students
Inter molecular forces of attraction are least effective in
a) Solids
b) Gases
c) liquids
d) Plasma
Option b – Gases
A gas can be liquefied
a) By increasing the temperature
b) By lowering the pressure
c) By increasing the pressure and reducing the temperature
d) None of these
Option b – By lowering the pressure
The change of state from vapour to liquid is called
a) Condensation
b) Evaporation
c) Sublimation
d) Fusion
Option a – Condensation
At the same temperature and pressure, which of the following gases will have maximum kinetic energy
a) Hydrogen
b) Oxygen
c) Methane
d) All the have same K.E
Option d – All the have same K.E
The state of matter which is found to be more stable at lower temperature
a) Solid
b) Liquid
c) Gas
d) None of these
Option a – Solid
A substance has neither a fixed shape nor a fixed volume which physical state is represented by the statement?
a) Solid
b) Liquid
c) Gas
d) None of these
Option c – Gas
When water get solidified into ice, then heat is
a) Absorbed
b) Evolved
c) first absorbed then evolved
d) Initially evolved and then absorbed
Option d – Initially evolved and then absorbed
Which of these is a characteristic property of gases?
a) Gases are not at all rigid
b) Gases are not compressible
c) Gases have particles in fixed positions
d) Gases have high density
Option a – Gases are not at all rigid
Among the following non-sublimate substances is
a) Coconut oil
b) Iodine
c) Naphthalene Balls
d) Camphor
Option a – Coconut oil
Which of the following statements do not go with the liquid state
a) particles are loosely packed in the liquid state
b) Fluidity is the maximum in the liquid state
c) liquids cannot be compressed
d) liquids take up the shape of any container in which these are placed
Option c – liquids cannot be compressed
The conversion of gas into liquid is called
a) Condensation
b) Freezing
c) Sublimation
d) Fusion
Option a – Condensation
The temperature at 4°c at 1atmospheeric pressure the correct statement the following among is
a) Water having minimum density
b) water having maximum density
c) The mass of water will be increased
d) Water having minimum volume
Option a – Water having minimum density
When we put some acetone (or) Perfume on our palm we feel cold because
a) They have high boiling point
b) They have low freezing point
c) These particles gain energy from our palm and evaporate
d) These particles lose energy
Option c – These particles gain energy from our palm and evaporate
When we add sugar in water, particles of sugar disappear because they
a) Are very small
b) Get into the spaces between water particles
c) Are moving
d) Are colourless
Option b – Get into the spaces between water particles
Which of the following substance is not a true solid?
a) Wood
b) Glass
c) Sponge
d) Rubber band
Option c – Sponge
In gases, particles vibrate
a) About their mean position
b) About a vertical axis
c) About a horizontal axis
d) In any direction
Option d – In any direction
Which of the following statements best describes the arrangement of particles in a gas?
a) Very far apart and moving quickly
b) Close together and vibrating
c) Close together and stationary
d) For apart and moving slowly
Option a – Very far apart and moving quickly
Boiling point of a material is depends on ……….
a) Temperature
b) Pressure
c) Volume
d) All
Option a – Temperature
Large volume of compressed natural gas (CNG) is available in small cylinders is due to its property
a) High inflammability
b) Easy availability
c) High compressibility
d) Low density
Option c – High compressibility
A form of matter has no fixed shape but it has fixed volume. An example of this form is
a) Hydrogen
b) Milk
c) Steel
d) None
Option b – Milk
The state change from liquid to gas below its boiling point is called
a) Melting
b) Boiling
c) Condensation
d) evaporation
Option d – evaporation
The state changes from gas to liquid is called
a) condensation
b) evaporation
c) Melting
d) freezing
Option a – condensation
Which one of the following is not a property of a liquid
a) Definite shape
b) Definite volume
c) definite mass
d) cannot be compressed
Option a – Definite shape
Which of the following is not compressible
a) Solid
b) liquid
c) gas
d) molecules
Option a – Solid
Which of the following has maximum expansion
a) liquid
b) gases
c) solids
d) condensation
Option b – gases
Matter consists of
a) particles
b) compounds
c) gas
d) solids
Option a – particles
A suspension is a
1) Homogeneous
2) Heterogeneous
3) colloids
4) True solution
Option 2 – Heterogeneous
A …….. is the substance that present in small proportion.
1) solvent
2) dispersed phase
3) dispersion medium
4) All of these
Option 2 – dispersed phase
Which of the following is an example of emulsion?
1) milk
2) Face cream
3) Both 1 & 2
4) shaving cream
Option 3 – Both 1 & 2
In coloured gem stone dispersion medium is
1) solid
2) liquid
3) gas
4) Both 2 & 3
Option 1 – solid
The mixture of acetone and water can be separated by
1) distillation
2) crystallisation
3) adsorption
4) Hand picking
Option 1 – distillation
Percentage of Argon by volume in air
1) 20.9
2) 0.9
3) 78.1
4) 75
Option 2 – 0.9
Which metals used in early days? are
1) Fe
2) Pb
3) Cu
4) All
Option 4 – All
A ………. contains more than one substance mixed in any proportion.
1) Element
2) Compound
3) Mixture
4) Atom
Option 3 – Mixture
…….. can be separated into pure substances using appropriate separation techniques.
1. Compounds
2) Elements
3) Mixtures
4) None of these
Option 3 – Mixture
A ……… is a homogeneous mixture of two or more substances. The major component of a solution is called the solvent and the minor the solute.
1) solute
2) Solvent
3) Solution
4) All of these
Option 3 – Solution
The …….. of a solution is the amount of solute present per unit volume or per unit mass of the solution.
1. Concentration
2) solubility
3) Density
4) Volume
Option 1 – Concentration
Materials that are insoluble in a solvent and have particles that are visible to naked eye, form?
1. Solution
2) Suspension
3) colloids
4) True solution
Option 2 – Suspension
A bar magnet is held perpendicular to a uniform magnetic field. If the couple acting on the magnet is to be quartered by rotating it, then the angle by which it is to be rotated is
(A) 32.6°
(B) 45°
(C) 58.2°
(D) 75.5°
Option d – 75.5°
Assertion: When a magnet is heated, its magnetism is lost. Reason: Upon heating, the thermal energy of elementary magnets increases and they form a closed chain.
(A) Assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is True.
Option a – Assertion is True, Reason is True; Reason is a correct explanation for Assertion.
The work function for the surface of aluminum is 4.2 eV. How much potential difference will be required to stop the emission of maximum energy electrons emitted by the light of 2000 Å wavelength?
(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
(A) is proportional to mass.
(B) is proportional to impulse.
(C) is inversely proportional to impulse.
(D) does not depend on impulse.
Option c – is inversely proportional to impulse.
According to the domain theory of ferromagnetism, a domain is a region
(A) where electrons are not paired off.
(B) where electrons leave vacancies due to transition to inner shells.
(C) which is magnetized to saturation.
(D) which has a maximum net magnetic moment.
Option c – which is magnetized to saturation.
Hysteresis energy loss for a ferromagnetic substance is independent of
(A) the volume of a substance.
(B) area of substance.
(C) time of current flow.
(D) all of the above.
Option b – area of substance.
Choose the CORRECT one: Wave theory when applied to the photoelectric effect explains
(A) the instantaneous emission of photoelectrons.
(B) inexistence of threshold frequency.
(C) the kinetic energy of emitted electrons is independent of the intensity of light.
(D) the kinetic energy of emitted electrons is dependent on their frequency.
Option b – inexistence of threshold frequency.
The K.E of the photoelectrons is 2.1 eV and the work function is 1.4 eV. The wavelength of incident light is
(A) 2896 Å
(B) 3552 A
(C) 3100 A
(D) 3767 Å
Option b – 3552 A
If two balls in motion under identical surrounding conditions possess the same de Broglie wavelength then,
(A) two balls must have the same momentum.
(B) two balls must have the same mass.
(C) two balls must have the same velocity.
(D) all of the above.
Option d – all of the above.
In the photoelectric effect experiment if the potential of the collector plate is maintained at zero with respect to the emitter plate then,
(A) no current is possible.
(B) the maximum current is observed.
(C) space charge is constituted.
(D) no electrons will be emitted from the emitter.
Option c – space charge is constituted.
For a paramagnetic substance graph between temperature and inverse of susceptibility is a straight line. This means
(A) the susceptibility of a paramagnetic substance is positive.
(B) they lose their magnetic character with the rise in temperature.
(C) every atom of a paramagnetic substance has some permanent magnetic dipole moment.
(D) their magnetic character is amplified with the rise in temperature.
Option b – they lose their magnetic character with the rise in temperature
A compass needle around a magnet experiences ………. and aligns itself along …………
(A) force, magnetic meridian
(B) force, magnetic field line
(C) torque, magnetic meridian
(D) torque, magnetic field line
Option d – torque, magnetic field line
In Davisson and Germer’s experiment, a detector with a galvanometer can be rotated on a circular scale. As the detector is rotated, the intensity of the electronic beam after diffraction
(A) remains constant.
(B) increases continuously.
(C) decreases continuously.
(D) increases to a maximum and then decreases to reach the minimum and again increases.
Option d – increases to a maximum and then decreases to reach the minimum and again increases.
The threshold wavelength for copper is 2750 Å. If ultraviolet light of wavelength 1500 Å is incident on the surface, what would be the maximum energy in eV of the ejected photoelectrons?
(A) 3.767 eV
(B) 4.107 eV
(C) 5.13 eV
(D) 6 eV
Option a – 3.767 eV
For equation M = NIAñ to be valid for the current loop, the loop has to be (i) planar (ii) of regular size and shape (iii) of irregular size and shape (iv) closed.
(A) (i), (ii) and (iv)
(B) (i) and (iii)
(C) (i) and (iv)
(D) (i), (iii) and (iv)
Option c – (i) and (iv)
Which of the following graphs will not have a constant slope? (Assume no other parameter is varied)
(A) Photoelectric current vs intensity.
(B) Stopping potential vs frequency of radiation.
(C) Photoelectric current vs collector plate potential.
(D) The maximum kinetic energy of emitted photoelectrons vs frequency.
Option c – Photoelectric current vs collector plate potential.
Assertion: Photoelectric emission cannot take place for incident radiation (v) below threshold frequency (Vo). Reason: For v <Vo, the maximum kinetic energy of the photoelectron is zero.
(A) Assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) Assertion is True, Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is True.
Option c – The assertion is True, Reason is False.
The frequency of a photon decides its
(A) energy.
(B) color.
(C) energy and color.
(D) intensity.
Option c – energy and color.
Assertion: In the northern hemisphere the north pole of the dip needle dips downwards. Reason: The north pole of the earth as a bar magnet lies in the northern hemisphere.
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is True.
Option c – The assertion is True, Reason is False.
In a planar current carrying a closed loop observer perceives a sense of current flow as clockwise then the magnetic moment vector associated with the current loop is
(A) perpendicular to the plane of the loop and away from the observer
(B) perpendicular to the plane of the loop and towards the observer
(C) parallel to the plane of the loop and away from the observer
(D) parallel to the plane of the loop and towards the observer
Option a – perpendicular to the plane of the loop and away from the observer
To obtain the high value of saturation current
(A) the intensity of radiation should be maximum.
(B) intensity and incident frequency of radiation should be maximum.
(C) incident frequency of radiation should be maximum while the intensity of radiation can be of any value.
(D) incident frequency of radiation should be greater than the threshold frequency and the intensity of radiation should be maximum.
Option d – incident frequency of radiation should be greater than the threshold frequency and the intensity of radiation should be maximum.
An electron, a helium nucleus, a neutron, and a proton have the same kinetic energy. Which of these particles has the shortest, de-Broglie wavelength?
(A) Electron
(B) Proton
(C) Helium nucleus
(D) Neutron
Option c – Helium nucleus
The intensity of light depends upon
(A) the velocity of photons present in light.
(B) a number of photons present in light.
(C) frequency of photons present in light.
(D) color of photons present in light.
Option b – a number of photons present in light.
In the photoelectric effect, which of the following is not conserved?
(A) Energy.
(B) Momentum.
(C) A number of photons.
(D) None of the above.
Option c – A number of photons.
The stopping potential (Vo)
(A) depends upon the angle of incident light.
(B) depends upon the intensity of incident light.
(C) is independent of photosensitive material.
(D) is independent of the intensity of the incident light.
Option d – is independent of the intensity of the incident light.
The velocity of photons reaching an emitter metal surface
(A) is the same for all photons.
(B) is the same for all photons with the same frequency.
(C) is the same for all photons with the same intensity.
(D) none of the above.
Option d – none of the above.
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