Welcome to your BC-Science

Oxidation is a process which involves
The process of reduction involves
Give the ratio in which hydrogen and oxygen are present in water by volume.
What type of chemical reactions take place when electricity is passed through water?
A substance added to food containing fats and oils is called:
Which one of the following salts does not contain water of crystallisation?
Tomato is a natural source of which acid?
Na2CO3 . 10H2O is
How many water molecules does hydrated calcium sulphate contain?
Sodium carbonate is a basic salt because it is a salt of a
Alkalis are
Lime water reacts with chlorine to give
The most abundant metal in the earth’s crust is
The poorest conductor of heat among metals is
The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the
Which of the following can make a parallel beam of light when light from a point source is incident on it?
A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is
Under which of the following conditions a concave mirror can form an image larger than the actual object?
Magnification produced by a rear view mirror fitted in vehicles
A full length image of a distant tall building can definitely be seen by using
In torches, search lights and headlights of vehicles the bulb is placed
The laws of reflection hold good for
You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most?
In which of the following, the image of an object placed at infinity will be highly diminished and point sized?
Light travel fastest in
The mirror having reflection surface curved outward
The mirror having reflecting surface curved inwards
The mirror used as rear-view mirror in vehicles
The deviation of light ray from its path when it travels from one transparent medium to another transparent medium is called
Convex lens is also known as
The image which is formed behind the mirror+D4

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