Hardness

Q.

How are liquids and gasses similar to each other?

Q. Which of the following gas highest fluidity?

1. Gum
2. Water
3. Honey
4. Toothpaste

Q.

The resistance to fatigue of a material is measured by

1. Elastic limit

2. Ultimate tensile strength

3. Youngs modulus

4. Endurance limit

Q. Arrange the jumbled words to arrive at the appropriate names of materials and also write two uses of each
A. milaunuim
B. tcaslpi
C. soekrnee​
D. gavnier​

Q. Find the odd one out from the following​

1. Eraser​
2. Pressure cooker​
3. Spade​
4. Tawa​

Q. Which of the given objects is hard, strong and unbreakable?

1. Earthern pot
2. Paper bag
3. Glass table
4. Iron nail

Q.

Which property of the material is required for making a hammer?

1. Heat resistance

2. Water resistance

3. Hardness

4. Softness

Q. Hardness of 5 materials A, B, C, D and E is A<B<C<D<E. If Steve wanted to pierce a nail into the board made from material C then from which material the nail can be made?

1. A
2. B
3. D
4. E

Q. Which among the following materials would you identify as soft materials and why?​

Ice, rubber band, leaf, eraser, pencil, pearl, a piece of wooden board, cooked rice, pulses and fresh chapati.​

Q. Which among the following materials would you identify as soft materials and why?​

Ice, rubber band, leaf, eraser, pencil, pearl, a piece of wooden board, cooked rice, pulses and fresh chapati.​

Q. What is conductivity! What is difference between conductivity and resistivity?

Q. Out of the below mentioned properties, which is the most important when making a hammer?

1. Heat resistance
2. Hardness
3. Lustre
4. Softness

Q.

Why does wood charcoal float in water, although it is heavier than water?

Q.

Which of the following is hardest among the given options?

1. Wood

2. Iron

3. Paper

4. Plastic

Q. A/An is made up of more than one material.

1. mobile phone
2. silver coin
3. plastic bottle
4. iron rod

Q. When an object is sorted on the basis of its appearance, what are the properties that are mostly checked?

Q.

We use a knife made of steel to cut the ingredients for making a proper meal. Why do you think steel is preferred?

1. Steel is harder than the materials it generally cuts.

2. Steel is very light in weight.

3. Steel is softer than the materials it generally cuts.

4. Steel is shiny and looks cool in hands.

Q. Take a glass and apply paint on it then the object changes from:

1. opaque to transparent
2. transparent to opaque
3. transparent to translucent
4. translucent to opaque

Q. How do we classify materials based on their hardness? Explain.

Q. Identify the object which is made from just one kind of material.

1. Pencil
2. Hammer
3. Gold coin
4. Bicycle

Q. Choose the correct pairs of object which have the same hardness.

1. 
2. 
3. 
4. 
5. 
6. 

Q. What are Elements

Q. Hardness is the ability of an object to withstand the pressure applied to compress it.

1. True
2. False

Q. Which among the following is the hardest substance?

1. Wood
2. Cheese
3. Iron
4. Plastic

Q. Knives that we use in the kitchen are made of steel because of its:

1. hardness
2. shine
3. softness
4. flexibility

Q.

Pick the right order based on their hardness - wood, iron, paper.

1. iron $>$ paper $>$ wood

2. iron $>$ wood $>$ paper

3. wood $>$ paper $>$ iron

4. paper $>$ wood $>$ iron

Q. One fine day John was cleaning utensils. He found that the sponge used for cleaning utensils can be compressed easily but the utensils cannot be compressed. He grouped utensils and sponge in two groups. On the basis of which of the following properties, can the utensils and sponge be sorted?

1. Appearance
2. Solubility
3. Transparency
4. Hardness

Q. Hardness is the ability of an object to withstand the pressure applied to deform it.

1. True
2. False

Q. Arrange the following substances in the increasing order of hardness.

1. Sponge
2. Brick
3. Iron rod
4. Diamond

Q. Which of the following property determines the resistance offered by a substance to another substance being pushed through it?

1. Elasticity
2. Brittleness
3. Density
4. Hardness