Name any two effects of electric current.
Electric current can give rise to heating and lighting.It can convert a straight conductor into a temporary magnet. Effects of... View Article
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Do all the stars in the sky move? Explain.
The earth rotates on its axis from west to east. Therefore, all the stars in the sky (except the pole... View Article
Stone is transparent, while glass is opaque.
False Explanation Glass is transparent because it allows light to pass through it, while stone is opaque because it does... View Article
Polyester is a natural fibre. (True or False).
Polyester is a natural fibre – False Explanation Polyester is a synthetic fibre created from coal and petroleum. Polyester is... View Article
Seed dispersal takes place by means of _____________, _____________ and _____________.
Seed dispersal takes place by means of wind, water and animal. Explanation Dispersal of seed takes place by various means... View Article
Which type of mirror can form a real image?
Concave mirror can form a real image. Explanation Concave mirrors are used in a number of applications. They form upright,... View Article
Explain how you can take care of your eyes.
Eyes are the important organ in our body. Humans have two eyes, but we only see one image. We use... View Article
Rubber is a magnetic material. (True or False)
False Explanation Rubber does not get attracted by a magnet. Therefore, it is not a magnetic material. All those materials... View Article
Motion of the needle of a sewing machine is ______________.
The motion of the needle of a sewing machine is periodic. Explanation The needle of a sewing machine, while moving... View Article
Joints of the bones help in the _______ of the body.
Joints of bones help in the movement of body. Explanation The point of contact where two bones are attached for... View Article
Describe the construction of a kaleidoscope.
A Kaleidoscope is an optical instrument with two or more reflecting surfaces. These reflecting surfaces are tilted at an angle,... View Article
The bones at the elbow are joined by a ______________________ joint.
Bones at the elbow are joined by a hinge joint. In hinge joints, the articulating ends of the bones fit... View Article
How will you prove that air supports burning?
Fire is a chemical reaction that creates light and heat from oxygen and fuel. A lit candle needs to draw... View Article
What do you understand by the term migration?
Migration refers to the movement of an organism or a group of organisms from its natural habitat to another place... View Article
A piece of wood floats on water. (True or False)
True Explanation It floats because it weighs less than the amount of water it would have to push out of... View Article
The layer of air around the earth is known as ___________.
The layer of air around the Earth is known as the atmosphere. Explanation Atmosphere has 4 layers like troposphere, stratosphere,... View Article
The main excretory product in human beings is _____
The major excretory product in humans is urea. The major wastes produced by us are:- Carbon dioxide and Urea . Carbon... View Article
The main steps of nutrition in humans are _________, __________, __________, _________ and __________.
The main steps of nutrition in humans are ingestion, digestion, absorption, assimilation and egestion. Explanation Ingestion is the process the... View Article
Sugar does not dissolve in water. (True or False)
False. Explanation Sugar dissolves in water because energy is given off when the slightly polar sucrose molecules form inter molecular... View Article
Why does a lump of cotton wool shrink in water?
A lump of cotton wool has a lot of air trapped inside the space present in its fibers. When this... View Article
