Physics 10th, Ch# 12 Total Marks: 20
Q. No: 1 Select
the most appropriate option: 10
1)
Half of the radius of curvature is called:
(a) focal length (b) principal focus (c)
axis (d) aperture
2)
The SI unit of power of a lens is:
(a) Candela (b) Pascal (c) metres (d) Dioptre
3)
Speed of light in the air in ms-1 is:
(a) 3 × 10 -8 (b) 340 (c) 3 ×
105 (d)
3 ×108
4)
The focal length of a convex lens is:
(a) negative (b) Virtual
(c) positive (d) None of these
5)
The power of a concave lens is:
(a) negative (b) Virtual (c) positive (d) None of these
6) Object is at 2F after passing through convex lens Image is formed:
(a) between F & 2F (b) beyond 2F (c) at 2F (d) No image is formed
7)
A lens is any __________material:
(a) opaque (b) reflecting (c) transparent (d) None of these
8) Convex Lens is also called?
(a) diverging lens (b) converging lens (c) Both a & b (d) None of these
9) For Power of Lens If f is expressed in meters so that
(a) 1 D = 1 m (b) 1 D = 1 m-2 (c) 1 D = 1 m-3 (d) 1 D = 1 m-1
10) In the camera, the object is placed
(a) between F & 2F (b) beyond
2F (c) at 2F (d) No image is formed
Q.no:
2; Define Resolving Power and
explain Magnifying Power of SIMPLE MICROSCOPE 10
