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An electrician is carrying out some repairs in your house. He wants to replace a fuse by a piece of wire. Would you agree? Give reasons for your response.

No, the electrician should not be allowed to replace the fuse in the house with a piece of wire. This is because every wire cannot be used as a... View Article

Choose the correct option from the following: Plants take carbon dioxide from the atmosphere mainly through their: (i) roots (ii) stem (iii) flowers (iv) leaves

(i) Carbon dioxide is released during photosynthesis. (False) During the process of photosynthesis, cells use carbon dioxide and energy from the... View Article

Why is the distance between stars expressed in light years? What do you understand by the statement that a star is eight light-years away from the Earth?

Stars are millions of kilometres away from the earth & giving their distances in the kilometres unit becomes very inconvenient. Light-year is... View Article

A rocket has been fired upwards to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad.

Two forces acting on the rocket immediately after leaving the launching pad are: Thrust provided by burning fuel in an upward direction... View Article

In addition to the rock particles, the soil contains (i) air and water (ii) water and plants (iii) minerals, organic matter, air and water (iv) water, air and plants

(iii) minerals, organic matter, air and water All soil is made up of inorganic mineral particles, organic matter (including living things), air... View Article

Mark ‘T’ if the statement is true and ‘F’ if it is false: When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. (T/F)

When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks- True When the current flowing through the... View Article

The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why?

Plastic and rubber both are bad conductors of electricity. So, they do not allow current to pass through them. The handles of tools like... View Article

While measuring the length of a knitting needle, the reading of the scale at one end is 3.0 cm and at the other end is 33.1 cm. What is the length of the needle?

The length of the knitting needle is the difference between two readings. Thus, length of knitting needle = 33.1− 3.0 = 30.1 cm... View Article

Discuss the effects of deforestation on the following. (a) Wild animals (b) Environment (c) Villages (Rural areas) (d) Cities (Urban areas) (e) Earth (f) The next generation

(a) Wild animals: Due to the deforestation natural habitat of the animals are destroyed. Without the natural habitat the animals are left... View Article

The radius of Jupiter is 11 times the radius of the Earth. Calculate the ratio of the volumes of Jupiter and the Earth. How many Earths can Jupiter accommodate?

The volume of sphere = 4/3 ℼr3 Let the radius of the earth be ‘r’ The radius of Jupiter = 11 x r The volume of earth = 4/3 ℼr3 The... View Article

You are a member of the municipal body of your town. Make a list of measures that would help your town to ensure the supply of clean water to all its residents.

We can take the following measures: Water should be treated properly before use to make it free from harmful germs, chemical and physical... View Article

When milk, cooled after boiling, is poured onto a piece of cloth the cream (malai) is left behind on it. This process of separating cream from milk is an example of ___________.

When milk, cooled after boiling, is poured onto a piece of cloth, the cream (malai) is left behind on it. This process of separating cream from... View Article

Mark ‘T’ if the statement is true and ‘F’ if it is false: The freshwater stored in the ground is much more than that present in the rivers and lakes of the world. (T/F)

True. The freshwater stored in the ground is much more than that present in the rivers and lakes of the world. Groundwater is the water found... View Article

Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/s, calculate the distance between her house and the school.

Given that, Speed of the bicycle = 2m/s Time taken to reach school = 15 minutes = 15 × 60 seconds = 900 seconds Speed = (Distance... View Article

Choose the correct option. Reproductive age in women starts when their (i) menstruation starts. (ii) breasts start developing. (iii) body weight increases. (iv) height increases.

(b) Reproductive age in women starts when their menstruation starts. Menstruation, or period, is normal vaginal bleeding that occurs as part of... View Article

Which one of the following is not responsible for water shortage? (i) Rapid growth of industries (ii) Increasing population (iii) Heavy rainfall (iv) Mismanagement of water resources

Heavy rainfall Water is one of the most valuable resources on Earth. Rainwater fills reservoirs that supply drinking water, provide a habitat... View Article

ind the odd one out from the following: a) Chair, Bed, Table, Baby, Cupboard b) Rose, Jasmine, Boat, Marigold, Lotus c) Aluminum, Iron, Copper, Silver, Sand d) Sugar, Salt, Sand, Copper sulphate

(a) Baby Chair, Bed, Table and cupboard are non-living things. Non-living things are inanimate objects or forces with the ability to influence,... View Article

Mark ‘T’ if the statement is true and ‘F’ if it is false: To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell. (T/F)

To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell- False To make a... View Article

Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.

A, H, I, M, O, T, U, V, W, and X are the letters that form the same image as the letter is. These letters are laterally symmetrical.... View Article

A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?

No, the changes which have occurred in the cement cannot be reversed because it is a irreversible chemical change. A bag of cement lying in the... View Article

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