Density

Q. Rohan observes that the paper boat floats on water. Which of the following option can give him the reason behind this?

1. Density
2. Evaporation
3. Pollution
4. Precipitation

Q. A solid iron ball floats in water

1. True
2. False

Q.

A wooden block floats and an iron block sinks when both are placed on the surface of the water? Explain why.

Q. On addition of salt, density of water .

1. remains same
2. increases
3. decreases
4. decreases tremendously

Q. Which of the following shows the correct order of increasing density?

1. Air < Oil < Brick
2. Oil < Air < Brick
3. Brick < Oil < Air
4. Air < Brick < Oil

Q.

Give a reason for the following ;

A hollow aluminum can floats on water.

Q. High amount of salt in the Dead Sea makes it a great place for fishes to live.

1. True
2. False

Q. The density of water in dead sea is _______ the density of Indian Ocean.

1. less than
2. more than
3. not comparable to
4. equal to

Q.

Adding a lot of salt to water increases its density.

1. True
2. False

Q.

A piece of ice floating in a glass of water melts but the level of water in the glass does not change. Explain this phenomenon.

Q. Vessel filled with water and kerosene oil. The vessel has small hole in bottom. Neglecting viscosity if thickness of water layer is h1and kerosene h2 then velocity of flow of water will be?

Q. Which of the following is not a human made change?

1. Canals
2. Glaciers
3. Flyovers
4. Bridges

Q. Ice floats on water.

1. True
2. False

Q.

Give the reason why is it easier to swim in seawater than in freshwater.

Q. Which of the following ways is/are used to obtain the particles of various substances?

1. Pounding
2. Sawing
3. Grinding
4. Freezing

Q. Find the odd one out.

1. Bathing animals
2. Fishing
3. Collecting water
4. Collecting salt

Q. The quantity that mentions how closely a material is packed is .

1. weight
2. mass
3. density
4. length

Q. The high amount of salt in the dead sea makes it a great place for fishes to live.

1. True
2. False

Q. You cannot find fishes in the Dead Sea because it is too ________.

1. salty
2. cold
3. hot
4. dense

Q. Density of water in dead sea is high due to presence of high amount of ______ in it.

1. pollutants
2. salt
3. sugar
4. gases

Q.

Objects made of metal usually ____ when dropped in water.

1. sink

2. float

3. burn

4. freeze

Q. Rivers of ice are known as ________.

1. floods
2. avalanche
3. landslides
4. glaciers

Q. Rohan jumped in the Dead Sea. He will ___________ in the water.

1. sink
2. float
3. submerge
4. die

Q.

Which of the following factors says how closely packed an object or material is?

1. Mass

2. Density

3. Weight

4. Buoyancy

Q.

Objects made of metal usually ____ when dropped in water.

1. sink

2. float

3. burn

4. freeze

Q.

The object given below pollutes the area when thrown in water bodies. Which of the following option is correct?

1. It will float in water.

2. It will sink in water.

3. It will mix with water.

4. It will evaporate.

Q.

Objects made of plastic usually ____ when dropped in water.

1. sink

2. float

3. burn

4. freeze

Q.

Objects made of plastic usually ____ when dropped in water.

1. sink

2. float

3. burn

4. freeze

Q. If the world is full of snow and ice without any technology and buildings, then what would be the best place to stay?

1. Mud house
2. Hut
3. Carevan
4. Natural caves

Q.

Pick the objects that float on water.

1. 

2. 

3. 

4.