Objective type questions,Class 8 , ch 2 -Physical quantities Measurement

Density & Floatation Interactive Practice

Interactive practice with MCQs, fill in the blanks, true/false, and matching questions.

Answers opened: 0 / 30

A Objective Type Questions (MCQs)

Q1 The correct relation between density, mass and volume is:

(i) Density = Mass × Volume
(ii) Mass = Density × Volume
(iii) Volume = Density × Mass
(iv) Density = Mass + Volume

(ii) Mass = Density × Volume

Q2 The relative density of alcohol is 0.8. Its density is:

(i) 0.8
(ii) 800 kg m⁻³
(iii) 800 g cm⁻³
(iv) 0.8 kg m⁻³

(ii) 800 kg m⁻³

Q3 A block of wood of density 0.8 g cm⁻³ has a volume of 60 cm³. The mass of the block is:

(i) 60.8 g
(ii) 75 g
(iii) 48 g
(iv) 0.013 g

(iii) 48 g

Q4 The density of aluminium is 2.7 g cm⁻³ and that of brass is 8.4 g cm⁻³. The correct statement is:

(i) Equal masses have equal volumes
(ii) Brass has more mass for equal volume
(iii) Brass has more volume for equal mass
(iv) Equal volumes have equal masses

(ii) Brass has more mass for equal volume

Q5 Equal volumes of aluminium and brass have equal masses. (True/False)

False

Q6 A density bottle has a marking 25 mL on it. It means that:

(i) Mass is 25 g
(ii) It stores 25 mL of any liquid
(iii) Only water can be stored
(iv) Stores different volumes

(ii) It stores 25 mL of any liquid

Q7 The correct statement is:

(i) Buoyant force = volume displaced
(ii) Buoyant force = volume of body
(iii) Buoyant force = weight of liquid displaced
(iv) Buoyant force = weight of body

(iii) Weight of liquid displaced

Q8 A piece of wood floats on water. The buoyant force acting on it is:

(i) Zero
(ii) More than weight
(iii) Equal to weight
(iv) Less than weight

(iii) Equal to weight

Q9 If the weight of a body is more than the buoyant force, the body will:

(i) Sink
(ii) Float partially
(iii) Float below surface
(iv) Float above surface

(i) Sink

B Fill in the Blanks

Q101 kg is the mass of __________ mL of water at 4°C.

1000

Q11Mass = density × __________

volume

Q12The SI unit of density is __________

kg m⁻³

Q13Density of water is __________ kg m⁻³

1000

Q141 g cm⁻³ = __________ kg m⁻³

1000

Q15A body that sinks has density __________ than water

greater

Q16If body sinks in A but floats in B, density of A is __________ than B

less

Q17Density of X is __________ than Y

greater

Q18Buoyant force in salt water is __________ than pure water

more

Q19Weight of floating body is __________ to buoyant force

equal

C True / False

Q20Equal volumes of different substances have equal masses.

False

Q21Density depends on shape.

False

Q22Density decreases with temperature.

True

Q23Relative density of water is 1.

True

Q24Relative density has unit.

False

Q25Buoyant force equals volume displaced.

False

Q26Same buoyant force in water and alcohol.

False

Q27Same buoyant force floating/sinking.

False

Q28Floating condition is correct.

True

Q29Body sinks more in less dense liquid.

True

D Match the Following

Q30 Match Column A with Column B:

Column A
(a) kg m⁻³
(b) No unit
(c) Relative density
(d) Iron
(e) Wood

Column B
(i) relative density
(ii) sinks in alcohol
(iii) floats on water
(iv) density
(v) density bottle

(a) → (iv)
(b) → (i)
(c) → (i)
(d) → (ii)
(e) → (iii)

• Facebook
• Twitter
• Whatsapp

• Newer

• Older