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Liquids

Unit – VII Liquids - PHYSICS

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Question 1
Pick the odd one from the following with respect to the properties of a liquid.
A
They have definite volume
B
Liquids are incompressible
C
They have their own shape
D
They have definite mass
Question 2
Every liquid exerts an upward force on the objects immersed in it. The upward force is called………….
A
Gravitational force
B
Buoyant force
C
Mechanical force
D
Magnetic force
Question 3
The upward thrust is equivalent to ……………..
A
hg
B
mg
C
pg
D
hp
Question 4
If the density of a liquid increases, the upthrust will…………
A
increase
B
Decrease
C
increases or decreases
D
Remain the same
Question 5
Buoyant force acting on an object is equal to the…………..
A
mass of the solid
B
Weight of the solid
C
Weight of liquid displaced by the object
D
Mass of the liquid displaced by the object
Question 6
…………… take the shape of the container.
A
solids
B
Liquids
C
Gases
D
None
Question 7
The pressure inside a liquid increases with ……………
A
mass
B
area
C
volume
D
depth
Question 8
…………. Is equal to the weight of the liquid displaced.
A
Buoyant force
B
Wt. of the solid
C
Gravitional force
D
Wt. of the liquid
Question 9
A bucket under water in a well is …………….
A
heavier
B
lighter
C
without change
D
twice as heavy
Question 10
Archimedes discovered
A
electricity
B
principle of moments
C
gravitational force
D
principle of lever
Question 11
The formula for pressure p=……………..
A
hg
B
ha
C
hdg
D
ahd
Question 12
Loss of Wt.in water=
A
Wt. of the immersed solid
B
Wt. of the displaced liquid
C
Zero
D
Wt. of the beaker
Question 13
An iron piece floats in mercury but sinks in water because of
A
greater density of mercury
B
greater density of water
C
greater density of iron
D
lesser density of iron
Question 14
…………. Is used to test the purity of milk.
A
Hydrometer
B
Lactometer
C
Test Tube Float
D
Measuring Jar
Question 15
The weight of the body in air is 20 N. Wt. in water is 16N what is its relative density
A
4
B
8
C
1.5
D
5
Question 16
A body floats when the upthrust is……….. the weight of the body
A
lesser than
B
greater than
C
equal to
D
half
Question 17
The principle used in hydrometer is………….
A
Law of floatation
B
Archimedes principle
C
Bovle’s law
D
Charles Law
Question 18
The ratio of density of the body to the density of water is …………..
A
Relative density
B
Buoyancy
C
Viscosity
D
Density of body
Question 19
When a body is immersed in a fluid, it experiences an apparent loss of
A
volume
B
pressure
C
weight
D
Matter
Question 20
A lactometer is a
A
test tube float
B
constant immersion hydrometer
C
variable immersion hydrometer
D
manometer
Question 21
…………. Has no unit.
A
Density
B
Relative Density
Question 22
……………. Is used to test the purity of milk.
A
Lactometer
B
Common hydrometer
Question 23
If the density of a liquid increases, the upthrust will………
A
increase
B
decrease
Question 24
  • Assertion (A)  : Liquids are incompressible
  •     Reason (R)      : They show little change in volume even when large compressive forces are applied.
A
A is correct R is wrong
B
R is correct A is wrong
C
A is correct R does not explain A
D
R explains A
Question 25
  • Assertion (A) : when a body floats or immerses in a liquid, the upward force is called buoyant force
  •     Reason (R)     : Density has no limit
A
A is correct R is wrong
B
A is wrong R is correct
C
Both A and R are wrong
D
R explains A
Question 26
  • Assertion (A)  : An iron piece floats in mercury but sinks in water
  •     Reason (R)      : The density of mercury is greater than the density of water.
A
A is correct R is wrong
B
R is correct A is wrong
C
R explains A
D
R does not explain A
Question 27
  • Assertion (A)  : When a body is immersed in water, its weight in water is greater than its weight in air.
  •    Reason (R)       : Lactometer is used to test the purity of milk.
A
A is correct R is wrong
B
A is wrong R is correct
C
A is correct R explains A
D
Both A and R are wrong
Question 28
  • Assertion (A)  : A common hydrometer is of variable immersion type
  •    Reason (B)       : Lactometer is of constant immersion type
A
A is correct R is wrong
B
R is correct A is wrong
C
R explains A
D
Both A and R are wrong
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