4. Charge may be measured in the
following units except
(a) Coulomb (b) atomic unit of charge (c)
farad (d) Electromagnetic unit of charge
5. Color depends on what characteristic
of light?
(a) its frequency (b) its wavelength (c)
both of these (d) neither of these
6. A concave mirror of radius of curvature
40 cm forms a real image twice as large
as the object. What is the object distance?
(a) 80 cm (b) 60 cm (c) 30 cm (d) 40 cm
7. The driving mirror of a car has a radius
of curvature of 1 m. A vehicle behind the
car is 4 m from the mirror. Find the image
distance behind the mirror.
(a) 7/8 (b) 4/9 (c) 4/7 (d) 9/2