List of top Science Questions

Why is tungsten normally used for the construction of filaments of electric bulbs?
In the given electric circuit find the current shown by ammeter A.
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(i) State any two factors on which the strength of magnetic field produced by a current-carrying solenoid depends.
(iii) State Fleming's left-hand rule.
(i) Explain the importance of using fuse in a household electric circuit.
(ii) How does an electromagnet differ from a permanent magnet?
Ozone gas present in upper surface of atmosphere protects earth from which radiation coming from sun?
Which of the following is correctly matched?
(i) Explain with the help of labelled ray diagram, the defect of hypermetropia. How is it corrected by a lens?
(ii) An object at a distance of 16 cm from a spherical mirror forms a virtual image at a distance of 12 cm behind the mirror. Determine the magnification of the image and type of the mirror.
(i) Draw a labelled ray diagram to show the formation of a virtual magnified image of an object by a convex lens.
(ii) A convex lens produces an inverted image magnified three times of an object placed at a distance of 15 cm from it. Calculate focal length of the lens.
'Guard Cells' are found in
What is required for the synthesis of thyroxine hormone ?
Mendel crossed long and dwarf plants of pea. The percentage of long and dwarf plants in first filial generation (F\(_1\)) was
Molecular formula of butanol-2 is
What are required for photosynthesis?
Which of the following is a biotic component of Ecosystem ?
The magnitude of magnetic force acting on a current carrying conductor in a uniform magnetic field does not depend on
Strong base is
Precipitation reaction is
Liquid metal at ordinary temperature is
At the time of short circuit, the electric current in the circuit becomes
O_2(g) is obtained on heating
The blue colour of the sky is due to the