The Wonderful World of Science — Science STD 6 — Question

Reeta puts two different objects in each of the following containers.

1. Container: Copper coin and iron nail.
2. Container: Steel nail and aluminium earring.
3. Container: Marble and gold coin.
4. Container: Nickel coin and steel nail.

She can use a magnet to separate the objects in containers:

Direction: Read the following three statements carefully and choose the correct option.

1. A physical change is one in which the substance undergoing change is not destroyed and no new substance is formed.
2. Glowing of an electric bulb is a physical change.
3. When antacid tablet is dropped in water, it fizzes. This is a chemical change.

Direction: Read the passages given below and answer the questions that follow Passage Mohan was boiling water in a pan for making tea. His brother Ram came there and observed that during boiling of water some bubbles are formed. He told his brother Mohan that boiling of water is a chemical change as gas is evolved in this process. But Mohan argued that this is not a chemical change. What kind of change takes place after formation of tea?

Find the odd one out:

The plants having green and tender stems are called

By which method is wheat flour separated from wheat bran?

Direction: Read the passages given below and answer the questions that follow Passage. The places in our body where two parts of our body seem to be joined is called a joint, e.g. in the elbow different bones are joined together. We can bend or move our body only at those points where bones meet. There are many different types of joints in our body to help in carrying out different movements and activities. A joint that allows movements in all directions is called:

The percentage amount of which of these gases in the air is the least?

Choose the correct statements:

Rajesh went to a dentist. He complained about swelling and bleeding gums. In your opinion he is suffering from which of the following diseases?