Class 8 Science Quiz: Density & Buoyancy

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Density and buoyancy basics

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NIDHI Pillai

India

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Class 8 Science Quiz: Density & Buoyancy


Class 8 Science Quiz: Density & BuoyancyOnline version Density and buoyancy basics by NIDHI Pillai 1 Density is defined as: a A. Mass × Volume b B. Volume ÷ Mass c C. Mass ÷ Volume d D. Weight ÷ Volume 2 SI unit of density is: a B. kg/m³ b C. g/mL c A. g/cm³ d D. N/m³ 3 An object will float in water if its density is: a A. Greater than water b D. Greater than iron c B. Equal to zero d C. Less than water 4 The upward force exerted by a liquid on an immersed object is called: a C. Buoyant force b A. Friction c D. Magnetic force d B. Gravity 5 Archimedes' Principle states that: a B. Floating objects have no weight. b A. Heavy objects always sink. c D. Density depends on colour. d C. Buoyant force equals the weight of displaced fluid. 6 A submarine rises because it: a C. Decreases its density b D. Stops moving c A. Becomes heavier d B. Increases its density 7 Icebergs float because: a C. Ice has no weight. b A. Ice is denser than water. c D. Ice contains air only. d B. Ice has lower density than water. 8 According to the law of floatation, a floating object displaces: a C. Water whose weight equals the object's weight b A. Water equal to its volume c B. Water equal to its mass d D. Half of its weight 9 Which instrument is used to measure the density of liquids? a C. Thermometer b A. Barometer c B. Hydrometer d D. Ammeter 10 Which of the following experiences the greatest buoyant force? a D. A magnet in air b C. A paper on a table c A. A feather in air d B. A stone completely immersed in water 11 Ships are made hollow to __________ their average density. a Neutralize b Increase c Decrease d Maintain 12 Whales float because of a thick layer of __________. a Water b Muscle c Bone d Fat (blubber) 13 Most of an iceberg remains __________ the water. a Above b At the surface c Below d Inside 14 The weight of displaced liquid equals the __________ force. a Elastic b Gravitational c Normal d Buoyant 15 A wooden block always sinks in water. a True b False 16 Buoyant force acts downward. a False b True 17 Iron ships float because their average density is less than water. a False b True 18 An object can float even if it is made of iron. Choose one or more answers a False b True 19 Why do submarines sink and float? a They have automatic flotation devices. b They control water in ballast tanks. Filling tanks increases density (sink); removing water decreases density (float). c They change atmospheric pressure. d They rotate to adjust buoyancy. 20 Why are only about 10% of icebergs visible above water? a Ice is slightly less dense than water, so most of its volume remains submerged while floating. b Ice floats because of its color. c Ice is denser than water. d Ice melts quickly, hiding submerged parts. 21 Convert 2 g/cm³ into kg/m³. a 2000 kg/m³ b 20,000 kg/m³ c 2 kg/m³ d 0.002 kg/m³ 22 Convert 500 kg/m³ into g/cm³. a 50 g/cm³ b 0.05 g/cm³ c 0.5 g/cm³ d 5 g/cm³ 23 Two blocks have the same mass. One is made of wood and the other of iron. Which occupies more space? Why? a The wooden block occupies more space because wood has lower density. b Both occupy the same space. c The iron block occupies more space because iron is heavier. d Density does not affect volume. 24 A stone has a mass of 200 g and a volume of 50 cm³. Find its density. a 2 g/cm³ b 4 g/cm³ c 5 g/cm³ d 10 g/cm³ 25 A wooden block has a mass of 120 g and a volume of 240 cm³. What is its density? a 0.5 g/cm³ b 1 g/cm³ c 2 g/cm³ d 4 g/cm³ 26 Three cubes of equal volume are made of different materials. Their masses are: Cube P = 100 g Cube Q = 200 g Cube R = 150 g Which cube has the highest density? a Cube P b Cube Q c Cube R d All have the same density 27 A cargo ship is loaded with heavy containers. After loading, the ship sits deeper in the water but still floats. What is the best explanation? a The ship's density becomes less than water. b The ship displaces more water until the buoyant force equals its weight. c The water becomes denser. d The ship becomes lighter after loading.

Class 8 Science Quiz: Density & Buoyancy

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Class 8 Science Quiz: Density & BuoyancyOnline version

by NIDHI Pillai

Density is defined as:

SI unit of density is:

An object will float in water if its density is:

The upward force exerted by a liquid on an immersed object is called:

Archimedes' Principle states that:

A submarine rises because it:

Icebergs float because:

According to the law of floatation, a floating object displaces:

Which instrument is used to measure the density of liquids?

Which of the following experiences the greatest buoyant force?

Ships are made hollow to __________ their average density.

Whales float because of a thick layer of __________.

Most of an iceberg remains __________ the water.

The weight of displaced liquid equals the __________ force.

A wooden block always sinks in water.

Buoyant force acts downward.

Iron ships float because their average density is less than water.

An object can float even if it is made of iron.

Why do submarines sink and float?

Why are only about 10% of icebergs visible above water?

Convert 2 g/cm³ into kg/m³.

Convert 500 kg/m³ into g/cm³.

Two blocks have the same mass. One is made of wood and the other of iron. Which occupies more space? Why?

A stone has a mass of 200 g and a volume of 50 cm³. Find its density.

A wooden block has a mass of 120 g and a volume of 240 cm³. What is its density?

Three cubes of equal volume are made of different materials. Their masses are: Cube P = 100 g Cube Q = 200 g Cube R = 150 g Which cube has the highest density?

A cargo ship is loaded with heavy containers. After loading, the ship sits deeper in the water but still floats. What is the best explanation?