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Refraction Through Spherical Lens, 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. If a lens has a focal length, F = +12 cm, then it is a

Question 1 of 20

2. If a lens has a focal length, f = -12 cm. then it is a

Question 2 of 20

3. Which lens always forms a virtual image?

Question 3 of 20

4. In a convex lens, where is the image formed, when an object is placed at 2F?

Question 4 of 20

5. What happens to the image formed by a convex lens if its lower part is blackened?

Question 5 of 20

6. Which lens has a virtual focus?

Question 6 of 20

7. Which lens always forms diminished and erect image?

Question 7 of 20

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

Question 8 of 20

9. The focal length of a concave lens is:

Question 9 of 20

10. Four students A, B, C and D did their experiment on finding the focal length of convex lens by obtaining the image of a distant object as follows:
Student A used the window grill in the laboratory as the object and a white paper sheet held in hand, as the screen.
Student B used a distant tree in absence of sunlight as the object, and a white thick board held on a stand, as the screen.
Student C used a well illuminated laboratory window grill as the object and a white paper sheet held on a stand as the screen.
Student D used a well illuminated distant tree as the object and a white thick board held on a stand, as the screen.
Arrange these techniques in order of decreasing accuracy in measurement.

Question 10 of 20

11. A magnifying glass is a

Question 11 of 20

12. Is the optical centre always at the centre of lens?

Question 12 of 20

13. Where should an object be placed in front of a convex lens to get a real image of the size of the object?

Question 13 of 20

14. The maximum image distance in case of a concave lens of focal length 'f' is :

Question 14 of 20

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

Question 15 of 20

16. Drop of water behaves likes a

Question 16 of 20

17. A lens which forms a virtual and enlarged image is

Question 17 of 20

18. To determine the focal length of convex lens by obtaining a sharp image of a distant object we generally follow the following steps which are not in proper sequence.

(a) Hold the lens between the object and the screen

(b) Measure the distance between the lens and the screen

(c) Select a well lit distant object

(d) Adjust the position of the lens to form a sharp image

The correct sequence will be:

Question 18 of 20

19. The image formed by a convex lens is observed to be virtual, erect and larger than the object. Then the position of the object should be

Question 19 of 20

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

Question 20 of 20

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