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Four identical iron bars were dipped in a heap of iron filings one by one. Figure shows the amount of iron filings sticking to each of them. (a) Which of the iron bar is likely to be the strongest magnet? (b) Which of the iron bars is not a magnet? Justify your answer.

(a) In the given figure we can see that the iron bar in figure (a) attracts the maximum iron fillings. There (a) is the strongest magnet. (b)... View Article

Boojho dipped a bar magnet in a heap of iron filings and pulled it out. He found that iron filings got stuck to the magnet as shown in fig 13.4. (i) Which regions of the magnet have more iron filings sticking to it? (ii)What are these regions called?

The ends of the magnet will have more number of iron fillings attached to it. It is because the magnetic strength is maximum at the ends of... View Article

How will you test that ‘tea dust’ is not adulterated with iron powder?

We can use a magnet to check the adulteration in tea dust with iron powder. If we move the magnet over the tea dust, the iron powder will be... View Article

Paheli and her friends were decorating the class bulletin board. She dropped the box of stainless steel pins by mistake. She tried to collect the pins using a magnet. She could not succeed. What could be the reason for this?

The magnet attracts only those metals which have magnetic properties in them like iron, nickel, cobalt and so on. Here the pins are made up of... View Article

Fill in the blanks. (i) When a bar magnet is broken; each of the broken part will have _____ pole/poles. (ii) In a bar magnet, magnetic attraction is _ near its ends.

(i) When a bar magnet is broken; each of the broken parts will have two poles/poles. When the magnet is broken then each part of the broken... View Article

A bar magnet is immersed in a heap of iron filings and pulled out. The amount of iron filing clinging to the (a) North Pole is almost equal to the South Pole. (b) North pole is much more than the South Pole. (c) North pole is much less than the South Pole. (d) Magnet will be same all along its length.

(a) the North Pole is almost equal to the South Pole Poles have the maximum magnetic strength of equal intensity. Therefore, the amount of iron... View Article

North pole of a magnet can be identified by (a) Another magnet having its poles marked as North pole and South pole. (b) Another magnet no matter whether the poles are marked or not. (c) Using an iron bar. (d) Using iron filings.

a) Another magnet having its poles marked as the North Pole and the South Pole. The magnet on which the North-South poles are marked can be... View Article

Three magnets A, B and C were dipped one by one in a heap of iron filing. Figure 13.3 shows the amount of the iron filing sticking to them. The strength of these magnets will be (a) A > B > C (b) A < B < C (c) A = B = C (d) A < B > C

a) A>B>C As we can see from the given figure, A attracts more iron fillings followed by magnet B. Magnet C hardly attracts any iron... View Article

The arrangement to store two magnets is shown by figures (a), (b), (c) and (d) . Which one of them is the correct arrangement?

b is the correct arrangement With time magnets lose their magnetic properties. So in order to retain their magnetic strength, the pair of... View Article

Observe the pictures A and B given in the figure carefully. Which of the following statement is correct for the above given pictures? (a) In A, cars 1 and 2 will come closer and in B, cars 3 and 4 will come closer. (b) In A, cars 1 and 2 will move away from each other and in B, cars 3 and 4 will move away. (c) In A, cars 1 and 2 will move away and in B, 3 and 4 will come closer to each other. (d) In A, cars 1 and 2 will come closer to each other and in B, 3 and 4 will move away from each other.

d) In A, cars 1 and 2 will come closer to each other and in B, 3 and 4 will move away from each other. In A, cars 1 and 2 will come closer to... View Article

What are the adaptive features of a lion that helps it in hunting?

Adaptation is the physical or behavioural characteristic of an organism that helps an organism to survive better in the surrounding... View Article

Like many animals although a car also moves still it is not considered as a living organism. Give 2-3 reasons.

Although a car also moves it is not considered as a living organism All living organisms have certain common characteristics, such as... View Article

Read the features of plants given below. (a) Thick waxy stem (b) Short roots (c) Cone-shaped plants (d) Sloping branches (e) Small or spine-like leaves (f) Hollow stem Choose the type of plant for every feature given in a, b, c, d, e and f from the list given: Aquatic plant, Desert plant, Mountainous plant

(a) Thick waxy stem – Desert plant The thick waxy coating on the stem of desert plants helps to retain water (b) Short roots –... View Article

What are the specific features present in a deer that helps it to detect the presence of predators like the lion?

Features in deer that helps it to detect the presence of predator are- Long ears that help it to recognise the movement of predators. Its eyes... View Article

Some desert plants have very small leaves whereas some others have only spines. How does this benefit the plants?

Desert plants have a good adaptability to insensitive conditions, like water scarcity, that's why they tend to conserve water. The small leaves... View Article

Mention one adaptation present in the following animals. (a) In camels to keep their bodies away from the heat of the sand. (b) In frogs to enable them to swim. (c) In dolphins and whales to breathe in the air when they swim near the surface of the water.

(a) The body structures of camels help them to survive in deserts. They have long legs that keep their body away from the hot sand. Due to their... View Article

Write the adaptation in aquatic plants due to which (a) Submerged leaves can bend in the flowing water. (b) Leaves can float on the surface of the water.

(a) Some aquatic plants are totally submerged in water. All parts of these plants grow under water. These submerged plants have narrow and very... View Article

Why do desert snakes burrow deep into the sand during the day?

Deserts are usually very dry. During the daytime, the sun shines brightly and heats up the desert sand, raising the temperature extremely high.... View Article

Paheli has a rose plant in her garden. How can she increase the number of rose plants in the garden?

One of the common methods of plant propagation that Paheli can use is to plant the stem cuttings of rose plants. About 20-30 cms long stems of a... View Article

Fill in the blanks. (a) Saline water, hot air and sand are _ components of a habitat. (b) The habitat of plants and animals that live _ in is called the aquatic habitat. (c) enables a plant or an animal to live in its surroundings. (d) Plants and animals that live on land are said to live in ____ habitats.

(a) The presence of specific features, which enable a plant or an animal to live in a particular habitat, is called adaptation. (b) The habitats... View Article

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