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1. The image formed by a plane mirror is always
A. Real and inverted
B. Virtual and erect
C. Diminished and real
D. Enlarged and inverted
2. The angle of incidence is equal to the angle of reflection.This is a law of
A. Refraction
B. Dispersion
C. Reflection
D. Diffraction
3. A mirror whose reflecting surface is curved inward is called
A. Plane mirror
B. Convex mirror
C. Concave mirror
D. Cylindrical mirror
4. The distance between the pole and the centre of curvature of a spherical mirror is
A. Aperture
B. Focal length
C. Radius of curvature
D. Principal axis
5. The relation between radius of curvature (R) and focal length (f) is
A. R = f
B. R = 2f
C. R = f/2
D. R = f²
6. The principal focus of a concave mirror is the point where
A. Parallel rays appear to meet
B. Rays parallel to the axis actually meet
C. Rays pass undeviated
D. All rays diverge
7. The image formed by a concave mirror when the object is at infinity is
A. Enlarged and virtual
B. Diminished and real
C. Same size and real
D. Enlarged and inverted
8. The image formed by a convex mirror is always
A. Real and inverted
B. Virtual and erect
C. Enlarged and real
D. Same size and inverted
9. The mirror used in vehicles as rear-view mirrors is
A. Plane mirror
B. Concave mirror
C. Convex mirror
D. Cylindrical mirror
10. A dentist uses a
A. Plane mirror
B. Concave mirror
C. Convex mirror
D. Prism
11. If the radius of curvature of a mirror is 20 cm, its focal length is
A. 10 cm
B. 20 cm
C. 40 cm
D. 5 cm
12. The magnification produced by a plane mirror is
A. 0
B. +1
C. â1
D. Infinity
13. The mirror formula is
A. 1/v â 1/u = 1/f
B. 1/v + 1/u = 1/f
C. v/u = f
D. v â u = f
14. In concave mirrors, the image is always virtual and erect when the object is
A. Beyond C
B. At infinity
C. Between P and F
D. At C
15. The field of view is widest in
A. Plane mirror
B. Concave mirror
C. Convex mirror
D. Cylindrical lens
16. The refractive index is defined as
A. sin i / sin r
B. sin r / sin i
C. v1 / v2
D. Both A and C
17. The speed of light is maximum in
A. Water
B. Glass
C. Air
D. Diamond
18. When a ray of light enters from air to glass obliquely, it bends
A. Away from the normal
B. Towards the normal
C. Without deviation
D. Parallel to normal
20. A lens thicker at the centre than at the edges is called
A. Concave lens
B. Convex lens
C. Plano lens
D. Diverging lens
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