An iron nail is kept in each of the following liquids. In which case would it lose its shine and appear dull?

Boojho found a bag containing the following materials.
(i) Mirror
(ii) Paper stained with oil
(iii) Magnet
(iv) Glass spectacles
Help Boojho in finding out the material(s) which is/are opaque.

Which pair of substances among the following would float in a tumbler half-filled with water?

Which type of the following materials is used for making the front glass (wind screen) of a car?

Which of the following will float on water?

Which among the following are commonly used for making a safety pin?

Which of the following materials is hard?

Which of the following materials is not soluble in water?

The property of a substance that decides whether it will float or sink in water is:

Select the odd one:

The property which is identified with nose is _________

Ice is ________ whereas water is _______

Butter paper is __________

Substances that are less ________ than water can float on water.

Materials can be classified as _______ and _________ on the basis of their texture

Name two materials which do not conduct electricity.

By which property, steel and sponge differ from each other?

On a bright sunny day, Shikha was playing hide and seek with her brother. She hid herself behind a glass door. Do you think her brother will be able to locate her? If yes, why? If no, why not?

Why a shopkeeper prefers to keep biscuits and sweets in a glass or plastic container?

Take a small cotton ball and place it in a tumbler/bowl filled with water. Observe it for at least 10 minutes. Will it float or sink in water and why?

Write two objects through which things can be seen clearly.

Why do we need to group materials in everyday life?

Why don't we use steel handles in utensils?

Name two objects that can float on water and two objects which sink in water

How is density of an object related to its floating or sinking?

Name five objects which can be made from wood.

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.

Why is a tumbler not made with a piece of cloth?

Why are handles of utensils made from wood or plastics?

It was Paheli's birthday. Her grandmother gave her two gifts made up of metals, one old dull silver spoon and a pair of lustrous gold ear-rings. She was surprised to see the difference in the appearance of the two metals. Can you explain the reason for this difference?

What do you mean by the hardness of materials? Explain with an example

What are lustrous materials? Give two examples

Pick five objects from the word box given in Fig. which are opaque and would sink in water.

Water and starch are mixed in a container. What kind of solution is formed

A solid is put in a bucket of water. It floats just below the surface of the water. What do you think is the density of the object in relation to the density of water?

Sugar, salt, mustard oil, sand, sawdust, honey, chalk powder, petals of flower, soil, copper sulphate crystals, glucose, wheat flour are some substances given to Paheli. She wants to know whether these substances are soluble in water or not. Help her in identifying soluble and insoluble substances in water.

Why do you think oxygen dissolved in water is important for the survival of aquatic animals and plants.

Chalk, iron nail, wood, aluminium, candle, cotton usually look different from each other. Give some properties by which we can prove that these materials are different.

Differentiate among opaque, translucent and transparent materials, by giving one example of each.