eVidyarthi

Class 10,Mathematics, Introduction to Trigonometry (Introduction to Trigonometric Identities)

1. There will be total 30 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. An object is placed on the principal axis of a spherical mirror. The object distance u is:
 
 
 
 

Question 1 of 30

2. Power of a lens is
 
 
 
 

Question 2 of 30

3. After reflection through a concave mirror, rays of light
 
 
 
 

Question 3 of 30

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

Question 4 of 30

5. The image formed by a convex lens is virtual when
 
 
 
 

Question 5 of 30

6. Whenever light goes from one medium to another, the characteristic that does not change is:
 
 
 
 

Question 6 of 30

7. A simple magnifying glass consists of:
 
 
 
 

Question 7 of 30

8. The size of the image formed by the convex mirror is
 
 
 
 

Question 8 of 30

9. Light travels faster in substance X as compared to substance Y, then refractive index is greater for
 
 
 
 

Question 9 of 30

10. Where should an object be placed in front of convex lens so as to obtain the image formed on slide projector?
 
 
 
 

Question 10 of 30

11. Real image
 
 
 
 

Question 11 of 30

12. Which lens always forms a virtual image?
 
 
 
 

Question 12 of 30

13. The lens which is used to correct myopia (shortsightedness) is
 
 
 
 

Question 13 of 30

14. Rahul is standing in front of a plane mirror. The distance between Rahul and his image is 150cm. If Rahul’s distance from the mirror is x. What could be the possible value of x?
 
 
 
 

Question 14 of 30

15. A ray of light travelling in air falls on the surface of a rectangular slab of a plastic material whose refractive index is 1.6. If the incident ray makes an angle of 53° with the normal, find the angle made by the refracted ray with the normal (sin 53° = 4/5)
 
 
 
 

Question 15 of 30

16. Which kind of a mirror is used to see the enlarged image of the object?
 
 
 
 

Question 16 of 30

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

Question 17 of 30

18. The focal length of a plane mirror is
 
 
 
 

Question 18 of 30

19. 1605_image015 is the lateral inversion of
 
 
 
 

Question 19 of 30

20. An observer moves towards a stationary plane mirror at a speed of 4m/s. The speed of image with respect to mirror is __________.
 
 
 
 

Question 20 of 30

21. A ray of light incident on the optical centre of a spherical lens, after refraction passes through:
 
 
 
 

Question 21 of 30

22. The concave mirrors are used in
 
 
 
 

Question 22 of 30

23. The magnification of a convex mirror is always:
 
 
 
 

Question 23 of 30

24. The mirror formula is valid for
 
 
 
 

Question 24 of 30

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

Question 25 of 30

26. Which one of the following is the use of concave lens
 
 
 
 

Question 26 of 30

27. If the speed of light in medium 1 and medium 2 are 2.5 x 108 m/s and 2 x 108 m/s respectively then the refractive index of medium 1 with respect to medium 2 is ___________
 
 
 
 

Question 27 of 30

28. The refractive index is
 
 
 
 

Question 28 of 30

29. Light changes its path as the medium changes during the transit. This is because of
 
 
 
 

Question 29 of 30

30. A spherical mirror and a thin spherical lens have each a focal length of -12 cm. The mirror and the lens are likely to be:
 
 
 
 

Question 30 of 30