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PHYSICS MCQ

Upthrust in Fluids, Archimedes' Principle and Floatation · ICSE STD 9 (ICSE - English Medium). 9 questions.

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9 questions · timed · auto-graded

MCQ 11 Mark
A body floats in a liquid $A$ of density $\rho_1$ with a part of it submerged inside the liquid, while in liquid $B$ of density $\rho_2$ it is totally submerged inside the liquid. The densities $\rho_1$ and $\rho_2$ are related as:
  • A
    $\rho_1=\rho_2$
  • B
    $\rho_1<\rho_2$
  • ✓
    $\rho_1>\rho_2$
  • D
    Nothing can be said
Answer
Correct option: C.
$\rho_1>\rho_2$
A body floats in a liquid $A$ of density $\rho_1$ with a part of it submerged inside the liquid, while in liquid $B$ of density $\rho_2$ it is totally submerged inside the liquid. The densities $\rho_1$ and $\rho_2$ are related as:$\rho_1>\rho_2$
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MCQ 21 Mark
A body of weight $W$ is floating in a liquid. Its apparent weight will be
  • A
    Equal to $W$
  • B
    Less than $W$
  • C
    Greater than $W$
  • ✓
    Zero
Answer
Correct option: D.
Zero
A body of weight $W$ is floating in a liquid. Its apparent weight will be Zero
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MCQ 31 Mark
For a floating body, its weight $W$ and upthrust $F_B$ on it are related as :
  • A
    $ W > F_B $
  • B
    $ W < F_B $
  • ✓
    $ W=F_B $
  • D
    Nothing can be said
Answer
Correct option: C.
$ W=F_B $
For a floating body, its weight $W$ and upthrust $F_B$ on it are related as : $ W=F_B $
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MCQ 41 Mark
The density of water is :
  • A
    $1000\ g\ cm ^{-3}$
  • B
    $1\ kg\ m ^{-3}$
  • ✓
    $1\ g\ cm ^{-3}$
  • D
    None of these.
Answer
Correct option: C.
$1\ g\ cm ^{-3}$
The density of water is : $1\ g\ cm ^{-3}$
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MCQ 51 Mark
The unit of relative density is :
  • A
    $g cm ^{-3}$
  • B
    $kg m ^{-3}$
  • C
    $m^3 kg^{-1}$
  • ✓
    no unit
Answer
Correct option: D.
no unit
The unit of relative density is : No unit.
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MCQ 61 Mark
Relative density of a substance is expressed by comparing the density of that substance with the density of :
  • A
    Air
  • B
    Mercury
  • ✓
    Water
  • D
    Iron
Answer
Correct option: C.
Water
Relative density of a substance is expressed by comparing the density of that substance with the density of : Water
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MCQ 71 Mark
A body of density $\rho$ sinks in a liquid of density $\rho_{ L }$. The densities $\rho$ and $\rho_{ L }$ are related as :
  • A
    $\rho=\rho_L$
  • B
    $\rho<\rho_L$
  • ✓
    $\rho>\rho_L$
  • D
    Nothing can be said.
Answer
Correct option: C.
$\rho>\rho_L$
A body of density $\rho$ sinks in a liquid of density $\rho_{ L }$. The densities $\rho$ and $\rho_{ L }$ are related as : : $\rho>\rho_L$
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MCQ 81 Mark
The $S.I.$ unit of upthrust is :
  • A
    $Pa$
  • ✓
    $N$
  • C
    $kg$
  • D
    $kg\ m ^2$
Answer
Correct option: B.
$N$
The $S.I.$ unit of upthrust is $: N $
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MCQ 91 Mark
A body will experience minimum upthrust when it is completely immersed in :
  • ✓
    Turpentine
  • B
    Water
  • C
    Glycerine
  • D
    Mercury
Answer
Correct option: A.
Turpentine
A body will experience minimum upthrust when it is completely immersed in : Turpentine
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