False. Notebook and eraser do not have any lustre because they are not metals. Lustre is gentle shining light that is reflected from a surface,... View Article
No rainfall for a year or more may lead to drought in the region. A drought is a period of drier-than-normal conditions that results in... View Article
The process of changing water vapour into water is called condensation. Condensation is simply the process of change of the vapour from gaseous... View Article
The weaving of yam makes a piece of fabric - True Fibres are first converted into yarn by the process of spinning . In the process of spinning... View Article
A convex lens or converging lens focuses the light rays to a specific point whereas a concave lens or diverging lens diverges the light rays. A... View Article
Pure air Polluted air Pure air consists of a mixture of gases in proper proportion which is good for living beings. Polluted air comprises... View Article
False Natural magnets were discovered in Greece. Magnets always have two poles; the north pole and the South Pole. A cylindrical magnet also... View Article
The process of changing water into its vapour state is called evaporation. The evaporation of water takes place only in sunlight. Water vapour... View Article
Cotton is obtained from the fruit of the cotton plants. The cottonseed, which is a fruit which on ripening splits open to release white fibres of... View Article
Night blindness is caused due to deficiency of vitamin A in our food. Night blindness (in which it is difficult or impossible to see in... View Article
Clean and transparent water is not always fit for drinking. If water is clear it doesn't mean that it is perfect for drinking without bacteria.... View Article
Artificial magnets are made in different shapes such as bar magnets, horse-shoe magnetsandcylindrical magnets. Artificial magnets can be created... View Article
Leaf produces the food of the plant, the process of making food in the presence of sunlight is called photosynthesis Photosynthesis reaction... View Article
An image formed by a concave lens cannot be obtained on a screen. Concave lenses create only virtual images . After the rays are refracted,... View Article
A device that is used to break an electric circuit is called a switch. A switch is the device which is used to break or make an electrical... View Article
(iv) m/s. Speed is measured as the ratio of distance to the time in which the distance was covered. Speed is a scalar quantity as it has... View Article
A longer line in the symbol for a cell represents its positive terminal. A cell is a single unit of device that converts chemical energy into... View Article
An image that can be obtained on a screen is called a real image. A real image can be viewed on a screen , a virtual image can not. Rays from... View Article
