Test: Materials - CTET & State TET MCQ

Those substances that have shining surface are called as lustrous substance. Diamond, gold and silver are lustrous

Gold is metal and Silicon is a metalloid. Those elements that shows the property of both metal and non-metal are called metalloids.

Metals when cut, their freshly cut surface has shining.

Non-metals are found in nature in solid, liquid and gaseous state. On the other hand metals are found in solid state except mercury that is liquid at room temperature.

Malleability is a physical property of metals that defines their ability to be hammered, pressed, or rolled into thin sheets without breaking. In other words, it is the property of a metal to deform under compression and take on a new shape.

• Difference in weight is the properties used to separate two solids from a mixture by winnowing.
• Husk or dirt particles can be separated by winnowing method. It is used to separate the heavier and lighter components of a mixture by wind or by blowing air.
• In this method, the mixture of husk and seeds of grain are take in plate and are made to fall down from a height up to our shoulders.

Transparent material is used to make wind screen of a car as it is must to see through them.

Explanation: A mixture of sand and sulphur cannot be separated by using water as a solvent because both are insoluble in water. 

The process by which the unwanted solid particles are removed from the liquid is called as filtration.

Non-metal are generally bad conductors of electricity but Graphite is an allotrope of carbon which is a good conductor of electricity.

Most of the substances that we see around us are a mixture of two or more substances.

All metals are found in solid state at normal room temperature except mercury, which is liquid at room temperature.

Out of these only Carbon (C) is a non-metal whereas the others are all metals.

Solids, liquids and gases all dissolves in water depending upon the type of the solute.

The property of metals by which they can be beaten into thin sheets is called malleability. Most metals are malleable. Gold and silver are the best malleable metals and can be hammered into very fine sheets or foils. 

To identify the odd item from the list, consider the function or category of each item:

1. Spade: A tool used for digging.
2. Eraser: An object used for removing pencil marks.
3. Tawa: A flat cooking pan used in Indian cooking.
4. Pressure cooker: A cooking appliance used for cooking food under pressure.

Eraser is the odd one out because it is the only item that is not related to cooking or tools used in cooking or gardening. The other items are related to either cooking (Tawa, Pressure cooker) or tools used for specific tasks (Spade).

Correct Answer:

2. Eraser

• Chalk powder is a carbonate compound, insoluble in water.
• Because of this property of chalk powder, it is easy to separate it from water.
• The mixture containing chalk powder and water is allowed to get filtered.
• (Filter paper can be used for filtration) After filtration, the retentate obtained is chalk and the filtrate obtained is water without chalk.
• The retentate is allowed to get dried and hence, chalk is obtained in powder form.

• Winnowing is the method in which heavier components of the mixture are separated from the lighter substances with the help of wind.
• This method is used for separating grains from husk after the process of threshing.

Iron nail lose its shine and appear dull due to rusting. Oxygen and water is necessary for rusting. Soft drink contain both of them.

• To remove undesirable substances: Separating mixtures allows for the removal of unwanted or harmful substances that may be present in the mixture.


• To get desirable substances: Separation of mixtures enables the extraction of specific components that are desired for a particular purpose or application.


• To obtain highly pure substances: By separating mixtures, it is possible to isolate and purify substances to achieve a high level of purity.

Therefore, mixtures need to be separated for various reasons including removing undesirable substances, obtaining desirable substances, and obtaining highly pure substances.

Translucent objects allow some light to travel through them. Materials like frosted glass and some plastics are called translucent. When light strikes translucent materials, only some of the light passes through them. Muslin cloth is translucent material.

The wooden door is an opaque object which does not allow any light to pass through it.

Those elements that show the property of both metal and non-metal both are called metalloid or semi metals. Silicon, germanium etc are common metalloid.

Safety pin is made up of either plastic or steel.

Steel can be moulded to get sharp points and plastic is used to seal the edges. Hence steel and plastic are used for making safety pins.

The method of separation used to separate stone from rice is handpicking.
 

Metals like sodium and potassium are soft and can be cut with a knife.

Formation of rust on metal surface like iron is also called as corrosion. Corrosion occurs in presence of water and oxygen.

If the particles of a substance have enough energy to partially overcome inter-molecular interactions, then the particles can move about each other while remaining in contact. This describes the liquid state. In a liquid, the particles are still in close contact, so liquids have a definite volume. However, because the particles can move about each other rather freely, a liquid has no definite shape and takes a shape dictated by its container.

Metal is characterised by high electrical conductivity. Metals are malleable, ductile, sonorous and good conductor of heat and electricity.