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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
Quick Quiz
To find the loss of weight in a liquid, one has to immerse the body
a) Completely
b) Partly
c) In salted water only
d) To one fourth of its volume
Option a – Completely
Up thrust depends on
a) Density of liquid
b) Volume of body immersed
c) Volume of the liquid
d) both (a) and (b)
Option d – both (a) and (b)
Buoyancy force depends on
a) Level increase in measuring jar
b) Density of liquid
c) Acceleration due to gravity
d) All of these
Option d – All of these
When a body is immersed in a liquid, the forces acting on it are
a) weight
b) up thrust
c) both (a) and (b)
d) neither (a) nor (b)
Option c – both (a) and (b)
Which one of the following is not a result of surface tension?
(a) Nearly spherical drop of rain
(b) Capillary rise
(c) Removal of dirt by soap or detergent
(d) Flow of a liquid
Option d – Flow of a liquid
Surface tension depends on
(a) atmospheric pressure
(b) nature of the liquid
(c) the temperature of the liquid
(d) All of the above
Option d – All of the above
With the rise in temperature, the surface tension of a liquid
(a) increases
(b) decreases
(c) remains unchanged
(d) None of the above
Option b – decreases
Soaps clean surfaces on the principle of
(a) viscosity
(b) floatation
(c) elasticity
(d) surface tension
Option d – surface tension
Kerosene oil rises up in the wick of a lantern because of
(a) surface tension
(b) buoyant force of air
(c) diffusion of the oil through the wick
(d) the gravitational pull of the wick
Option a – surface tension
The surface tension of water on adding detergent to it
(a) increases
(b) decreases
(c) remains unchanged
(d) becomes zero
Option b – decreases
Insects can move on the surface of water without sinking due to
(a) viscosity of water
(b) the surface tension of water
(c) Both (a) and (b)
(d) None of the above
Option b – the surface tension of water
Why do water droplets always take a round shape when dropped onto plane surfaces? ( mcq on flotation class 9 )
(a) Due to gravity
(b) Due to atmospheric pressure
(c) Due to the presence of eddy currents in the air
(d) Due to the exertion of surface tension by the molecules
Option d – Due to the exertion of surface tension by the molecules
The sun is seen a little before it rises and for a short while after it sets. This is because of:
(a) Total internal reflection
(b) Atmospheric refraction
(c) Apparent shift in the direction of the sun
(d) Dispersion
Option b – Atmospheric refraction
When a ball bounces off the ground, which of the following changes suddenly? (Assume no loss of energy to the floor)
(a) Its speed
(b) Its Momentum
(c) Its kinetic energy
(d) Its potential energy
Option b – Its Momentum
If an object moves at a non-zero constant acceleration for a certain interval of time, then the distance it covers in that time:
(a) Depends on its initial velocity.
(b) Is independent of its initial velocity.
(c) Increases linearly with time.
(d) Depends on its initial displacement.
Option a – Depends on its initial velocity
Soaps clean surfaces according to the principles based on: ( mcq on flotation class 9 )
(a) Viscosity
(b) Floatation
(c) Elasticity
(d) Surface tension
Option d – Surface tension
The loudness of sound depends upon the:
(a) Velocity of sound waves in the medium
(b) Amplitude of the sound waves.
(c) Frequency of the sound waves.
(d) Frequency and velocity of the sound waves.
Option b – Amplitude of the sound waves
Compared to audible sound waves, ultrasound waves have:
(a) Higher speed
(b) Higher frequency
(c) Longer wavelength
(d) Both higher speed and frequency
Option d – Both higher speed and frequency
The temperature of a place on a sunny day is 113 in Fahrenheit scale. The Kelvin scale reading of this temperature will be:
(a) 318 K
(b) 45 K
(c) 62.8 K
(d) 335.8 K
Option a – 318 K
Metal has………. no. of electrons in their outermost shell ( mcq on flotation class 9 )
(a) 1 to 8
(b) 7 to 9
(c) 1 to 3
(d) 10 to 12
Option c – 1 to 3
Which of the following gas is lighter
(a) H₂
(b) SO₂
(c) O₂
(d) NO₂
Option a – H₂
Which method is employed for obtaining a pure metal?
(a) Froth floatation
(b) Electrolytic refining
(c) Magnetic separation
(d) Gravity separation
Option b – Electrolytic refining
What happens when a mixture of powdered iron and copper (II) oxide is heated in a crucible?
(a) Iron (II) oxide and copper are formed.
(b) Copper (III) oxide and iron (II) oxide are formed.
(c) Iron (III) oxide and copper sulphate are formed.
(d) No reaction takes place.
Option a – Iron (II) oxide and copper are formed
Why is the polling process employed?
(a) For the removal of Cu₂O from Cu
(b) For the removal of Al2O2 from Al
(c) For the removal of Fe₂O3 from Fe
(d) For the removal of MgCl₂ from Mg
Option a – For the removal of Cu₂O from Cu
In which of the following is thermite welding done?
(a) Girders
(b) Railway tracks
(c) Cracked machine parts
(d) All of the above
Option d – All of the above
Identify the formula of superphosphate of lime.
(a) Ca3(PO4)2
(b) CaHPO4
(c) Ca(OH)₂
(d) Ca(H₂PO4)2H₂O
Option d – Ca(H₂PO4)2H₂O
Which of the given metals is stored under kerosene to prevent oxidation?
(a) Copper
(b) Potassium
(c) Magnesium
(d) Calcium
Option b – Potassium
Non-metals generally form
(a) Anions
(b) Cations
(c) Ions
(d) None of these
Option a – Anions
Galvanisation is a method of protecting iron from rudfing by coating it with a thin layer of
(a) Galium
(b) Aluminium
(c) Zinc
(d) Silver
Option c – Zinc
An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following
(a) Mg
(b) Na
(c) P
(d) Ca
Option b – Na
The reaction between X and Y forms compound Z. X loses electrons and Y gains electrons. Which of the following properties is not shown by Z?
(a) Has a high melting point
(b) Has a low melting point
(c) Conducts electricity in a molten state
(d) Occurs as solid
Option c – Conducts electricity in a molten state
The electronic configurations of three elements X, Y and Z are X-2, 8; Y-2, 8, 7 and Z-2, 8, 2. Which of the following is correct?
(a) X is a metal
(b) Y is a metal
(c) Z is a non-metal
(d) Y is a non-metal and Z is a metal
Option c – Z is a non-metal
Which of the following non-metal is lustrous?
(a) Sulphur
(b) Oxygen
(c) Nitrogen
(d) iodine
Option d – iodine
Example of amphoteric oxide is :
(a) Na2O
(b) K₂O
(c) Al2O3
(d) MgO
Option c – Al2O3
Which one among the following is an acidic oxide?
(a) Na2O
(b) CO
(c) CO2
(d) Al2O3
Option c – CO2
The atomic number of an element ‘X’ is 12. Which inert gas is nearest to X?
(a) He
(b) Ar
(c) Ne
(d) Kr
Option c – Ne
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called
(a) Roasting
(b) Reduction
(c) Calcination
(d) Smelting
Option c – Calcination
Oxides of moderately reactive metals like Zine, Iron, Nickel, Tin, Copper etc. are reduced by using
(a) Aluminium as a reducing agent
(b) Sodium as a reducing agent
(c) Carbon as a reducing agent
(d) Calcium as a reducing agent
Option c – Carbon as a reducing agent
In thermite welding a mixture of….. and…… is ignited with a burning magnesium ribbon which produces molten iron metal as a large amount of heat is evolved.
(a) iron (III) oxide and aluminium powder
(b) iron (II) oxide and aluminium powder
(c) iron (III) chloride and aluminium powder
(d) iron (III) sulphate and aluminium powder
Option a – iron (III) oxide and aluminium powder
Which of the following are not ionic compounds? (i) KC1 (ii) HCI (iii) CCl4 (iv) NaCl
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iii)
Option b – (ii) and (iii)
Silver articles become black on prolonged exposure to air. This is due to the formation of
(a) Ag3N
(b) Ag₂O
(c) Ag₂S
(d) Ag₂S and Ag3N
Option c – Ag₂S
The reaction between X and Y forms compound Z. X loses electrons and Y gains electrons. Which of the following properties is not shown by Z?
(a) Has a high melting point
(b) Has a low melting point
(c) Conducts electricity in a molten state
(d) Occurs as solid
Option b – Has a low melting point
Brass is a mixture 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 Mg and Mn
Option a – copper and zinc
Which of the following non-metals has shining lustrous surfaces?
(a) Graphite and phosphorus
(b) Graphite and iodine
(c) Iodine and phosphorus
(d) Phosphorus and chlorine
Option b – Graphite and iodine
Consider the following elements : (i) Copper (ii) Gold (iii) Platinum (iv) Silver Which of the above elements exist free in nature?
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i), (ii) and (iv)
(d) (iii) and (iv)
Option c – (i), (ii) and (iv)
Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same? (i) Good thermal conductivity (ii) Good electrical conductivity (iii) Ductility (iv) High melting point
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (i) and (iv)
Option d – (i) and (iv)
What happens when calcium is treated with water? (i) It does not react with water (ii) It reacts violently with water (iii) It reacts less violently with water (iv) Bubbles of hydrogen gas formed stick to the surface of calcium
(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (ii)
(d) (iii) and (iv)
Option d – (iii) and (iv)
Which property of metals is used for making bells and strings of musical instruments like the Sitar and Violin?
(a) Sonorousness
(b) Malleability
(c) Ductility
(d) Conductivity
Option a – Sonorousness
Al₂O3 + 2NaOH -> …….. + H₂O
(a) Al(OH)3
(b) Na20
(c) NaAlO₂
(d) AINaO₂
Option c – NaAlO₂
Which of the following is the correct arrangement of the given metals in ascending order of their reactivity? Zinc, Iron, Magnesium, Sodium
(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 the following pairs will give displacement reactions?
(a) FeSO4 solution and Copper metal
(b) AgNO3 solution and Copper metal
(c) CuSO4 solution and Silver metal
(d) NaCl solution and Copper metal
Option b – AgNO3 solution and Copper metal
Non-metals form covalent chlorides because
(a) they can give electrons to chlorine
(b) they can share electrons with chlorine
(c) they can give electrons to chlorine atoms to form chloride ions
(d) they cannot share electrons with chlorine atoms
Option b – they can share electrons with chlorine
Which of the following oxide(s) of iron would be obtained on the prolonged reaction of iron with steam?
(a) FeO
(b) Fe₂O3
(c) Fe3O4
(d) Fe₂O3 and Fe₂O4
Option c – Fe3O4
Which of tire following are not ionic compounds? (i) KCI (ii) HCI (iii) CCl4 (iv) NaCl
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iii)
Option b – (ii) and (iii)
Highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the
(a) electrolysis of their molten chloride
(b) electrolysis of their molten oxides
(c) reduction by aluminium
(d) reduction by carbon
Option a – electrolysis of their molten chloride
The most abundant metal in the earth’s crust is
(a) Iron
(b) Aluminium
(c) Calcium
(d) Sodium
Option b – Aluminium
The poorest conductor of heat among metals is ( mcq on flotation class 9 )
(a) Lead
(b) Mercury
(c) Calcium
(d) Sodium
Option a – Lead
The capacitance of two capacitors is 4 µF, 6 μF, and P.D. of 30 V, and 20 V respectively. When the parallel combination of condensers is connected with a thin wire in parallel, their total energy will :
(A) reduce by 120 μ J
(B) increase by 240 μ J
(C) reduce by 240μ J
(D) be unchanged
Option a – reduce by 120 μ J
In Electrostatic generators, charges are carried into the shell on a rapidly moving belt made of
(A) superconducting material
(B) semi-conducting material
(C) conducting material
(D) insulating material
Option d – insulating material
Which of the following instrument works on the principle of action of sharp points?
(A) Cyclotron
(B) Van de Graff generator
(C) Dynamo
(D) Induction coil
Option b – Van de Graff generator
Van de Graff generator is :
(A) an electrostatic machine
(B) an electromagnetic machine
(C) used to produce changed particles
(D) an electrodynamic machine
Option a – an electrostatic machine
A Van de Graaff generator is used for
(A) to produce high potential
(B) to accelerate charged particles like protons, and deuterons
(C) in the study of nuclear physics
(D) all of these
Option d – all of these
The P.D. across the plates of a condenser is 60 V and its capacity is 12 uF. Another condenser of 24 uF is connected with it in series and its free plate is earthed. The P.D. across 24 uF capacitor will be :
(A) 90 V
(B) 60 V
(C) 30 V
(D) 20 V
Option c – 30 V
Two capacitors of 3 uF and 6 μF are connected in series across a P.D. of 120 V. The P. D. across 3 μF capacitor is :
(A) 50 V
(B) 80 V
(C) 110 V
(D) 40 V
Option b – 80 V
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