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MCQ on Flotation Class 9. We covered all the MCQ on buoyancy class 9 in this post for free so that you can practice well for the exam.
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MCQ on Floating Bodies for Students
To measure the loss in weight of an object placed in a liquid, the object must be
(a) Fully submerged
(b) Partially submerged
(c) Dipped only in saltwater
(d) Submerged to one-fourth of its volume
Option a – Fully submerged
The buoyant force on a body relies on
(a) The liquid’s density
(b) The volume of the submerged portion
(c) The overall volume of the liquid
(d) Both (a) and (b)
Option d – Both (a) and (b)
What does the force of buoyancy depend on?
(a) Rise in liquid level in a container
(b) Liquid density
(c) Gravity
(d) All of these
Option d – All of these
When an object is placed in a fluid, which forces are acting on it?
(a) Gravitational force
(b) Buoyant force
(c) Both (a) and (b)
(d) Neither (a) nor (b)
Option c – Both (a) and (b)
Which of the following does not result from surface tension?
(a) Spherical shape of rain droplets
(b) Liquid rising in capillaries
(c) Dirt removal by soap
(d) Movement of a fluid
Option d – Movement of a fluid
What factors influence surface tension?
(a) Atmospheric pressure
(b) Type of liquid
(c) Temperature of the liquid
(d) All of the above
Option d – All of the above
As temperature increases, surface tension of a liquid
(a) Increases
(b) Decreases
(c) Remains the same
(d) None of these
Option b – Decreases
The cleaning action of soap is mainly due to
(a) Viscosity
(b) Buoyancy
(c) Elasticity
(d) Surface tension
Option d – Surface tension
Why does kerosene rise through the wick in a lamp?
(a) Due to surface tension
(b) Because of air’s upthrust
(c) Through diffusion in the wick
(d) Pulled by gravity
Option a – Due to surface tension
What happens to water’s surface tension when detergent is added?
(a) Increases
(b) Decreases
(c) Stays constant
(d) Reduces to zero
Option b – Decreases
Why can some insects walk on water without sinking?
(a) Water’s viscosity
(b) Water’s surface tension
(c) Both of the above
(d) Neither of the above
Option b – Water’s surface tension
Why do water droplets form a spherical shape on flat surfaces?
(a) Due to gravity
(b) Due to air pressure
(c) Because of eddy currents in air
(d) Due to surface tension
Option d – Due to surface tension
Why does the Sun appear before actual sunrise and linger after sunset?
(a) Total internal reflection
(b) Refraction in the atmosphere
(c) Apparent positional shift
(d) Light dispersion
Option b – Refraction in the atmosphere
What changes abruptly when a ball rebounds from the ground (assuming no energy loss)?
(a) Its velocity
(b) Its momentum
(c) Its kinetic energy
(d) Its potential energy
Option b – Its momentum
If an object travels with constant acceleration, the distance covered:
(a) Depends on starting speed
(b) Is independent of initial velocity
(c) Grows linearly over time
(d) Relates to its starting position
Option a – Depends on starting speed
The working principle behind soap’s cleaning action is:
(a) Viscosity
(b) Buoyancy
(c) Elastic behavior
(d) Surface tension
Option d – Surface tension
What determines the loudness of a sound?
(a) Speed of sound in the medium
(b) Wave amplitude
(d) Both speed and frequency
Option b – Wave amplitude
In comparison to audible sound, ultrasound has:
(a) Greater speed
(b) Higher frequency
(c) Longer wavelength
(d) Both (a) and (b)
Option d – Both (a) and (b)
A location shows 113°F on a sunny day. Its temperature in Kelvin is:
(a) 318 K
(b) 45 K
(c) 62.8 K
(d) 335.8 K
Option a – 318 K
Metals usually have how many electrons in their outermost shell?
(a) Between 1 and 8
(b) Between 7 and 9
(c) Between 1 and 3
(d) Between 10 and 12
Option c – Between 1 and 3
Which gas among the following is the lightest?
(a) Hydrogen (H₂)
(b) Sulphur dioxide (SO₂)
(c) Oxygen (O₂)
(d) Nitrogen dioxide (NO₂)
Option a – Hydrogen (H₂)
Which technique is used to extract pure metal from an impure sample?
(a) Froth flotation
(b) Electrolytic purification
(c) Magnetic filtration
(d) Gravity-based separation
Option b – Electrolytic purification
What is the outcome when powdered iron is heated with copper(II) oxide in a crucible?
(a) Formation of iron(II) oxide and copper
(b) Production of copper(III) oxide and iron(II) oxide
(c) Iron(III) oxide and copper sulfate are produced
(d) No chemical reaction takes place
Option a – Formation of iron(II) oxide and copper
The purpose of the polling process is
(a) To eliminate Cu₂O from copper
(b) To eliminate Al₂O₂ from aluminium
(c) To eliminate Fe₂O₃ from iron
(d) To eliminate MgCl₂ from magnesium
Option a – To eliminate Cu₂O from copper
Thermite welding is commonly used in
(a) Bridge supports
(b) Railway track joints
(c) Repair of machine components
(d) All of these
Option d – All of these
What is the chemical formula for superphosphate of lime?
(a) Ca₃(PO₄)₂
(b) CaHPO₄
(c) Ca(OH)₂
(d) Ca(H₂PO₄)₂·H₂O
Option d – Ca(H₂PO₄)₂·H₂O
Which of these metals is kept under kerosene to prevent air reaction?
(a) Copper
(b) Potassium
(c) Magnesium
(d) Calcium
Option b – Potassium
Non-metals usually form which type of ions?
(a) Negative ions
(b) Positive ions
(c) Neutral ions
(d) None of the above
Option a – Negative ions
Iron is protected from rusting by applying a coating of
(a) Gallium
(b) Aluminium
(c) Zinc
(d) Silver
Option c – Zinc
A certain element is soft, easily sliced with a knife, reacts vigorously with water, and oxidizes in air. What is it?
(a) Magnesium
(b) Sodium
(c) Phosphorus
(d) Calcium
Option b – Sodium
In a reaction, substance X donates electrons and Y accepts them to form compound Z. Which of these is not a trait of Z?
(a) High melting temperature
(b) Low melting temperature
(c) Ability to conduct electricity when molten
(d) Solid state structure
Option c – Ability to conduct electricity when molten
Given the configurations: X – 2,8; Y – 2,8,7; Z – 2,8,2. Which statement is accurate?
(a) X is metallic
(b) Y is metallic
(c) Z is non-metallic
(d) Y is non-metallic and Z is metallic
Option c – Z is non-metallic
Which of these non-metals displays a shiny appearance?
(a) Sulphur
(b) Oxygen
(c) Nitrogen
(d) Iodine
Option d – Iodine
Which of the following is an amphoteric oxide?
(a) Sodium oxide
(b) Potassium oxide
(c) Aluminium oxide
(d) Magnesium oxide
Option c – Aluminium oxide
Select the acidic oxide from the options below.
(a) Sodium oxide
(b) Carbon monoxide
(c) Carbon dioxide
(d) Aluminium oxide
Option c – Carbon dioxide
An element has atomic number 12. Which noble gas is closest in configuration?
(a) Helium
(b) Argon
(c) Neon
(d) Krypton
Option c – Neon
Heating a carbonate ore strongly in the absence of air to convert it to metal oxide is called
(a) Roasting
(b) Reduction
(c) Calcination
(d) Smelting
Option c – Calcination
Oxides of metals like zinc, iron, nickel, tin, and copper are commonly reduced using
(a) Aluminium
(b) Sodium
(c) Carbon
(d) Calcium
Option c – Carbon
In thermite welding, which mixture is ignited using a magnesium ribbon to produce molten iron?
(a) Iron(III) oxide and aluminium powder
(b) Iron(II) oxide and aluminium powder
(c) Iron(III) chloride and aluminium powder
(d) Iron(III) sulfate and aluminium powder
Option a – Iron(III) oxide and aluminium powder
Identify which of the following are not ionic in nature: (i) KCl, (ii) HCl, (iii) CCl₄, (iv) NaCl ( MCQ on Flotation Class 9 )
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iii)
Option b – (ii) and (iii)
Silver items tarnish after long exposure to air due to formation of
(a) Silver nitride
(b) Silver oxide
(c) Silver sulfide
(d) Silver nitride and sulfide
Option c – Silver sulfide
In a reaction where one element loses electrons and another gains them to form compound Z, which is not a feature of Z?
(a) High melting point
(b) Low melting point
(c) Conducts electricity in molten state
(d) Solid in nature
Option b – Low melting point
Brass is an alloy composed of ( MCQ on Flotation Class 9 )
(a) Copper and zinc
(b) Copper and tin
(c) Copper, nickel, and zinc
(d) Aluminium, copper, and traces of magnesium and manganese
Option a – Copper and zinc
Which of the following non-metals have a shiny surface? ( MCQ on Flotation Class 9 )
(a) Graphite and phosphorus
(b) Graphite and iodine
(c) Iodine and phosphorus
(d) Phosphorus and chlorine
Option b – Graphite and iodine
From the following, which elements are found in free form in nature?
(a) Copper and gold
(b) Gold and platinum
(c) Copper, gold, and silver
(d) Platinum and silver
Option c – Copper, gold, and silver
Aluminium is suitable for making cookware due to which of these properties?
(a) High thermal and electrical conductivity
(b) Thermal conductivity and ductility
(c) Electrical conductivity and ductility
(d) Thermal conductivity and high melting point
Option d – Thermal conductivity and high melting point
What happens when calcium reacts with water? ( MCQ on Flotation Class 9 )
(a) No reaction occurs
(b) The reaction is vigorous
(c) It reacts slowly with water
(d) Bubbles of hydrogen gas form and cling to the metal
Option d – Bubbles of hydrogen gas form and cling to the metal
Which property of metals is responsible for their use in musical instruments? ( MCQ on Flotation Class 9 )
(a) Ability to produce sound (sonorousness)
(b) Ability to be hammered into sheets
(c) Ability to be drawn into wires
(d) Ability to conduct electricity
Option a – Ability to produce sound (sonorousness)
In the reaction Al₂O₃ + 2NaOH → ___ + H₂O, the missing product is
(a) Aluminium hydroxide
(b) Sodium oxide
(c) Sodium aluminate
(d) Sodium aluminium oxide
Option c – Sodium aluminate
What is the correct order of reactivity among these metals: Zinc, Iron, Magnesium, Sodium? ( MCQ on Flotation Class 9 )
(a) Zinc > Iron > Magnesium > Sodium
(b) Sodium > Magnesium > Iron > Zinc
(c) Sodium > Zinc > Magnesium > Iron
(d) Sodium > Magnesium > Zinc > Iron
Option d – Sodium > Magnesium > Zinc > Iron
Which of these pairs will undergo a displacement reaction?
(a) Iron sulfate and copper
(b) Silver nitrate and copper
(c) Copper sulfate and silver
(d) Sodium chloride and copper
Option b – Silver nitrate and copper
Why do non-metals form covalent chlorides? ( MCQ on Flotation Class 9 )
(a) Because they donate electrons to chlorine
(b) Because they share electrons with chlorine
(c) Because they give up electrons to form chloride ions
(d) Because they cannot share electrons with chlorine
Option b – Because they share electrons with chlorine
Which oxide of iron forms when it reacts with steam for a long duration?
(a) Iron(II) oxide
(b) Iron(III) oxide
(c) Triiron tetroxide (Fe₃O₄)
(d) A combination of Fe₂O₃ and Fe₂O₄
Option c – Triiron tetroxide (Fe₃O₄)
Which among the following compounds are not ionic in nature?
(a) Potassium chloride and hydrogen chloride
(b) Hydrogen chloride and carbon tetrachloride
(c) Carbon tetrachloride and sodium chloride
(d) Potassium chloride and carbon tetrachloride
Option b – Hydrogen chloride and carbon tetrachloride
How are highly reactive metals like sodium, potassium, and magnesium extracted? ( MCQ on Flotation Class 9 )
(a) Through electrolysis of their molten chlorides
(b) Through electrolysis of their molten oxides
(c) By reduction with aluminium
(d) By carbon reduction
Option a – Through electrolysis of their molten chlorides
Which metal is most abundantly found in Earth’s crust?
(a) Iron
(b) Aluminium
(c) Calcium
(d) Sodium
Option b – Aluminium
Among metals, which one is the least effective in conducting heat? ( MCQ on Flotation Class 9 )
(a) Lead
(b) Mercury
(c) Calcium
(d) Sodium
Option a – Lead
Two capacitors of 4 µF and 6 µF are charged to 30 V and 20 V. When connected by a wire, the total energy will
(a) Decrease by 120 μJ
(b) Increase by 240 μJ
(c) Decrease by 240 μJ
(d) Remain the same
Option a – Decrease by 120 μJ
In an electrostatic generator, the moving belt that transports charge is made of ( MCQ on Flotation Class 9 )
(a) Superconducting material
(b) Semi-conducting material
(c) Conductive material
(d) Insulating material
Option d – Insulating material
Which device works using the principle of sharp points?
(a) Cyclotron
(b) Van de Graaff generator
(c) Electric dynamo
(d) Induction coil
Option b – Van de Graaff generator
The Van de Graaff generator functions as ( MCQ on Flotation Class 9 )
(a) An electrostatic device
(b) An electromagnetic device
(c) A particle accelerator
(d) An electrodynamic machine
Option a – An electrostatic device
The Van de Graaff generator is mainly used to ( MCQ on Flotation Class 9 )
(a) Produce high voltage
(b) Accelerate charged particles such as protons and deuterons
(c) Assist in nuclear studies
(d) Perform all of the above
Option d – Perform all of the above
A 12 µF capacitor is charged to 60 V and connected in series with a 24 µF capacitor, whose other plate is grounded. The potential difference across the 24 µF capacitor is
(a) 90 V
(b) 60 V
(c) 30 V
(d) 20 V
Option c – 30 V
Two capacitors, 3 µF and 6 µF, are connected in series across 120 V. The voltage drop across the 3 µF capacitor is ( MCQ on Flotation Class 9 )
(a) 50 V
(b) 80 V
(c) 110 V
(d) 40 V
Option b – 80 V
We covered all the MCQ on flotation class 9 mcq with answers pdf file provided above in this post for free so that you can practice well for the exam.
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