Physical Properties of Water

Q. Metal react with water to form metal oxide and hydrogen gas. Give reasons

Q.

Some metals react with steam to liberate hydrogen gas and metallic oxide.

1. True
2. False

Q.

Coal is an element.

1. True
2. False

Q.

Pure water is a :

1. tasteless and colourless compound

2. tasteless and coloured compound

3. sour and colourless compound

4. sweet and colourless compound

Q.

Why do we float on the Dead Sea?

1. Friction

2. Density

3. Motion

4. Weight

Q.

What is the melting point of ice on the Celsius scale ?

Q. Ice is made up of water in solid form whereas water vapour does not contain any water.

1. True
2. False

Q.

Define hydrated substance by giving example.

Q.

Why are taps left dripping in sub-zero temperatures during winter?

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

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

Q.

what is physical state of water at 100 degree celcius

Q.

Name two naturally occurring, solid forms of water.

Q.

Glaciers and ice sheets present on poles of the earth contain the solid form of water.

1. True

2. False

Q.

A reaction between metal and water forms metal oxide. Guess the other product.

1. Metal hydride

2. Metal hydroxide

3. Hydrogen

4. Oxygen

Q. Which among the following change the colour of water?

1. Turmeric powder
2. Orange juice
3. Salt
4. Milk

Q.

How would you establish experimentally water is a bad conductor of heat?

Q. A .............. (mixture/compound) is a pure substance containing two or more (elements/compounds) in a fixed proportion.

Q. Snow and ice, are present as ________ at the poles of the earth, snow-covered mountains, and glaciers.

1. liquid form
2. the solid form
3. the gaseous form
4. none of the above

Q.

The bottom of the lake freezes faster than the top surface.

1. True

2. False

Q. Match column A to column B:
$\begin{array}{cc}ColumnA& ColumnB\\ a.Noblegas& \left(i\right)Carbon,hydrogen,oxygen\\ b.Graphite& \left(ii\right)Argon\\ c.Calcium& \left(iii\right)Lubricants\\ d.Glucose& \left(iv\right)Monoatomic\end{array}$

1. a-(i), b-(ii), c-(iii), d-(iv)
2. a-(ii), b-(iii), c-(iv), d-(i)
3. a-(iii), b-(i), c-(ii), d-(iv)
4. a-(ii), b-(iii), c-(iv), d-(i)

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

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

Q. Ram on a rainy day notices pellets of ice falling along with rain. These are known as:

1. snow
2. dew
3. fog
4. hailstones

Q.

What are the forms that water can exist in?

1. Solid

2. Liquid

3. Gaseous

4. None of these

Q. Find odd one out

River, Spring, Sea, Ponds

Q.

Which among the following is the false statement?

1. Water boils below 100⁰C on mountain peaks.

2. Ice undergoes sublimation on the surface of the moon.

3. Ice melts above 0^oC on mountain peaks.

4. Cooking of food is faster on mountain peaks.

Q.

Which of the following is not a physical property of water?

1. It is a colourless liquid

2. Water contract when cooled upto 4^oC

3. The specific heat capacity of water is 1 calorie/(gram^oC)

4. On increasing pressure the freezing point of water decreases

Q.

What are the processes involved in the formation of rain?

1. Evaporation, Condensation

2. Condensation, Sedimentation

3. Evaporation, Sedimentation

4. Fusion of clouds

Q. Water occurs in frozen state over the land is

1. 0.75%
2. 1.97%
3. 2.1%
4. 2.5%

Q.

Water is _______ .

1. a polyatomic ion

2. a compound

3. an element

4. an atom

Q.

Which of the following objects will sink?

1. Empty water bottle

2. Log of a tree

3. A plastic toy

4. A stone bowl