Find out the letters of the English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.
An electrician is carrying out some repairs in your house. He wants to replace a fuse with a piece of wire. Would you agree? Give reasons for your response.
Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.
When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.
Let us assume that our galaxy consists of 2.5 × 1011 stars each of one solar mass. How
long will a star at a distance of 50,000 ly from the galactic centre take to complete one
revolution ? Take the diameter of the Milky Way to be 105
ly.
Io, one of the satellites of Jupiter, has an orbital period of 1.769 days and the radius
of the orbit is 4.22 × 108
m. Show that the mass of Jupiter is about one-thousandth
that of the sun.
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