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When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.

The needle of a compass is a tiny magnet, which points in the north-south direction. When a magnet is brought close to it, the needle gets... View Article

If the petals of a flower are joined together, then the pistil is joined to the petal. Correct the following statement and rewrite it.

If the petals of a flower are joined together, then the pistil is not necessarily joined to the petal. Flowers having separated sepals are Rose... View Article

Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.

a drawing board a white sheet of paper a few common pins and a plane mirror. Pin the white sheet of paper firmly on the drawing board. Place... View Article

Using the “conduction tester” on an object it was found that the bulb begins to glow. Is that object a conductor or an insulator? Explain.

Yes, the given object is a conductor, as it allows the electric current to pass through it and causes the bulb of the tester to glow. Current... View Article

Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way?

Yes, a cylindrical shape is the one that would give a circular shadow if held in one way and a rectangular shadow if held in another way. Its... View Article

Mark ‘T’ if the statement is true and ‘F’ if it is false: Plants carry out photosynthesis only during the day and respiration only at night.

Plants carry out photosynthesis only during the day and respiration only at night. (False) Plants respire all the time, day and night. But... View Article

Take out a cooled bottle of water from refrigerator and keep it on a table. After some time you notice a droplets of water around it. Why?

This is because water vapour present in air collide with the surface of cold water bottle which and condenses into water droplets. These water... View Article

Out of the following, which are the two terms related to silk production? Sericulture, floriculture, moriculture, apiculture and silviculture.

Sericulture, moriculture are the terms related to silk production. Moriculture can be defined as the process of cultivating mulberry plants in... View Article

Is it possible for you to find out whether a plant has taproot or fibrous roots by looking at the impression of its leaf on a sheet of paper?

Yes, we can find out whether a plant has tap root or fibrous roots by looking at the impression of its leaves on a sheet of paper. If the leaf... View Article

Choose the most appropriate answer. Internal fertilisation occurs (i) in female body. (ii) outside female body. (iii) in male body. (iv) outside male body.

(a) Internal fertilization occurs - (i) in the female body. Internal fertilization is a type of sexual fertilization. It is the union of an egg... View Article

Gurmit wanted to perform Activity 16.8 using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teacher’s advise?

Laser torch has laser light. Laser light has very high intensity and hence it is harmful for the human eyes. It can cause damage to the eyes and... View Article

Which of the non-living things listed below, were once part of a living thing? Butter, Leather, Soil, Wool, Electric bulb, Cooking oil, Salt, Apple, Rubber

The non-living things which were once a part of living things are butter, leather, wool, cooking oil, apple, and rubber. Butter is made from... View Article

Show the shape of the distance-time graph for the motion in the following cases: (i) A car moving with a constant speed. (ii) A car parked on a side road.

(i) A car moving with a constant speed covers equal distance in equal intervals of time. It will be a uniform motion. (ii) A car parked on a... View Article

Water absorption through roots can be increased by keeping the plants (i) in the shade (ii) in dim light (iii) under the fan (iv) covered with a polythene bag

Water absorption through roots can be increased by keeping the plants under the fan Water absorption through the roots can be increased by... View Article

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

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