You are provided with a concave mirror, a convex mirror, a
concave lens and a convex lens. To obtain an enlarged image
of an object you can use either
(a) concave mirror or convex mirror.
(b) concave mirror or convex lens.
(c) concave mirror or concave lens.
(d) concave lens or convex lens.
If an object is placed at a distance of 0.5 m in front of a plane
mirror, the distance between the object and the image formed
by the mirror will be
(a) 2 m
(b) 1 m
(c) 0.5 m
(d) 0.25 m
Which of the following can be used to form a real image?
(a) Concave mirror only.
(b) Plane mirror only.
(c) Convex mirror only.
(d) Both concave and convex mirrors.
Boojho and Paheli were given one mirror each by their teacher.
Boojho found his image to be erect and of the same size whereas
Paheli found her image erect and smaller in size. This means
that the mirrors of Boojho and Paheli are, respectively
(a) plane mirror and concave mirror.
(b) concave mirror and convex mirror.
(c) plane mirror and convex mirror.
(d) convex mirror and plane mirror.
Draw the symbols of the following circuit components.
(i) electric cell
(ii) switch in off position
(iii) electric bulb
(iv) battery
How does the magnetic effect of electric current help in the
working of an electric bell? Explain with the help of a diagram
Boojho made an electromagnet by winding 50 turns of wire
over an iron screw. Paheli also made an electromagnet by
winding 100 turns over a similar iron screw. Which electro
magnet will attract more pins? Give reason.
Why do we cover plug pin holes which are within the reach of
children with cellotape or a plastic cover when not in use?
Name two electric devices for each where (i) heating effect of
current is used and (ii) magnetic effect of current is used.
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