Class-X

1. 1.Image formed by convex mirror is

         a. Real and erect

         b. Real and inverted

         c. Virtual and erect

         d. Virtual and inverted

2. Speed of light in vacuum 

1. 3 X  10^10 m/s

2. 2 X 10^8 km/h

3. 3 X 10^8 m/s

4. 1.5 X 10^4 km/s

3. An object is placed at a distance of 0.25 m

in front of a plane mirror. The distance between the object and image will be

(a) 0.25 m

(b) 1.0 m

(c) 0.5 m

(d) 0.125 m

4. The angle of incidence for a ray of light having zero reflection angle is

(a) 0

(b) 30°

(c) 45°

(d) 90°

5. For a real object, which of the following can produce a real image?

(a) Plane mirror

(b) Concave mirror

(c) Concave lens

(d) Convex mirror

6. a mirror forms a virtual image of an object

a. it must be a concave mirror

b. it must be a convex mirror

c. plane mirror

d. it may be any of the mirror mentioned above

7. Which of the following mirror is used by a dentist to examine a small cavity?

(a) Convex mirror

(b) Plane mirror

(c) Concave mirror

(d) Combination of convex and concave mirror

 8.A concave mirror gives real, inverted and same size image if the object is placed

         a. At F

         b. At infinity

         c. At C

         d. Beyond C

 

   9.The radius of curvature of a mirror is 20cm the focal length is

         a. 20cm

         b. 10cm

         c. 40cm

         d. 5cm

 

 

10. Image formed by plane mirror is

         a. Real and erect

         b. Real and inverted

         c. Virtual and erect

         d. Virtual and inverted

 

11.Under which of the following conditions a concave mirror can form an image larger than the actual object?

(a) When the object is kept at a distance equal to its radius of curvature

(b) When object is kept at a distance less than its focal length

(c) When object is placed between the focus and centre of curvature

(d) When object is kept at a distance greater than its radius of curvature

 

12.Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?

(a) 15 cm in front of the mirror

(b) 30 cm in front of the mirror

(c) between 15 cm and and 30 cm in front of the mirror

(d) more than 30 cm in front of the mirror

 

13.The laws of reflection hold good for

(a) plane mirror only

(b) concave mirror only

(c) convex mirror only

(d) all mirrors irrespective of their shape

 

 

14.Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in figure?

 

15.Light travel fastest in

(a) Water

(b) Air

(c) Glass

(d) Diamond