Mirror Formulae, Class 10 Science NCERT Solutions

1. There will be total 20 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. When a mirror is rotated through an angle θ, the reflected ray from it turns through an angle of

θ

θ/2

2θ

none of the above

Question 1 of 20

2. Which of the following is the correct mirror formula?

A

B

C

D

Question 2 of 20

3. An object is placed 60 cm in front of a concave mirror. The real image formed by the mirror is located 30 cm in front of the mirror. What is the object's magnification?

+2

-0.5

+0.5

-2

Question 3 of 20

4. A concave mirror of focal length 'f' produces an image 'n' times farther than the object. If the image is real, then the distance of the object from the mirror is:

(n-1)f

(n+1)f/ n

(n-1)f / n

(n+1) f

Question 4 of 20

5. If the magnification has a negative sign, the image formed by the concave mirror must be

Real and inverted

Virtual and inverted

Virtual and erect

Real and erect

Question 5 of 20

6. If the magnification has a positive sign, the image formed by the concave mirror must be

Real and inverted

Real and erect

Virtual and erect

Virtual and inverted

Question 6 of 20

7. According to the new cartesian sign convention,

Focal length of both, convex and concave mirror is positive.

Focal length of convex mirror is negative and that of concave mirror is positive.

Focal length of both, convex and concave mirror is negative.

Focal length of convex mirror is positive and of concave mirror is negative.

Question 7 of 20

8. When the image is of double size as the object, the magnification is

one

four

two

three

Question 8 of 20

9. The expression for the magnification of a spherical mirror in terms of focal length (f) and the distance of the object from mirror (u) is :

-f/ (u+f)

f/ (u+f)

-f/ (u-f)

f /(u-f)

Question 9 of 20

10. The mirror formula is valid for

Concave mirror only

Convex mirror only

Plane mirror only

All spherical mirrors

Question 10 of 20

11. If a, b, c and d represent object distance, image distance, focal length and radius of curvature in case of a spherical mirror, then:

A

B

C

D

Question 11 of 20

12. When the image is of the same size as the object, the magnification is

Equal to one

Zero

Greater than one

Smaller than one

Question 12 of 20

13. The correct relation between u, v and f is:

A

B

C

D

Question 13 of 20

14. Which one is correct as the new cartesian sign conventions?

Object distance is negative when taken from left of pole.

Image distance is positive when taken from left of pole.

All distances are measured from the principal focus

Image always forms above the principal axis.

Question 14 of 20

15. An object is placed on the principal axis of a spherical mirror. The object distance u is:

Negative if the object is to the left of the pole

Definitely positive

Negative if the object is to the right of the pole

Definitely negative

Question 15 of 20

16. The unit of linear magnification is

Dioptre

Metre

Metre per second

It is unitless

Question 16 of 20

17. If h' is the size of the image and h the size of object .The magnification for a spherical mirror is

A

B

C

D

Question 17 of 20

18. An object 2 cm high is placed at a distance of 15 cm from a concave mirror which produces an inverted image 4 cm high. Find the position of the image.

30 cm

-30 cm

40 cm

-40 cm

Question 18 of 20

19. The magnification of a convex mirror is always:

Less than 1

Infinity

Equal to 1

More than 1

Question 19 of 20

20. If the focal length of a spherical mirror is - 20 cm, then it is a:

Double convex mirror

Concave mirror

Plane mirror

Convex mirror

Question 20 of 20

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