Match the items given in Column I with one or more items of Column II.
Column I Column II
(a) A plane mirror (i) Used as a magnifying glass.
(b) A convex mirror (ii) Can form image of objects
spread over a large area.
(c) A convex lens (iii) Used by dentists to see
enlarged image of teeth.
(d) A concave mirror (iv) The image is always inverted
and magnified.
(e) A concave lens (v) The image is erect and of the
same size as the object.
(vi) The image is erect and smaller
in size than the object.
Mark ‘T’ if the statement is true and ‘F’ if it is false:
(a) We can obtain an enlarged and erect image by a convex mirror. (T/F)
(b) A concave lens always form a virtual image. (T/F)
(c) We can obtain a real, enlarged and inverted image by a concave
mirror. (T/F)
(d) A real image cannot be obtained on a screen. (T/F)
(e) A concave mirror always form a real image. (T/F)
Fill in the blanks:
(a) An image that cannot be obtained on a screen is called
____________.
(b) Image formed by a convex __________ is always virtual and smaller
in size.
(c) An image formed by a __________ mirror is always of the same size
as that of the object.
(d) An image which can be obtained on a screen is called a _________
image.
(e) An image formed by a concave ___________ cannot be obtained on
a screen.
Make four electromagnets with 20, 40, 60 and 80 turns. Connect them
one by one to a battery of 2 cells. Bring the electromagnet near a box of
pins. Count the number of pins attracted by it. Compare the strengths
of the Explain…
An electrician is carrying out some repairs in your house. He wants to
replace a fuse by 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.
Mark ‘T’ if the statement is true and ‘F’ if it is false:
(a) To make a battery of two cells, the negative terminal of one cell is
connected to the negative terminal of the other cell. (T/F)
(b) When the electric current through the fuse exceeds a certain limit,
the fuse wire melts and breaks. (T/F)
(c) An electromagnet does not attract a piece of iron. (T/F)
(d) An electric bell has an electromagnet. (T/F)
Fill in the blanks:
(a) Longer line in the symbol for a cell represents its terminal.
(b) The combination of two or more cells is called a .
(c) When current is switched ‘on’ in a room heater, it .
(d) The safety device based on the heating effect of electric current is
called a .
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