Online Test of Chapter 10 Light Reflection and Refraction MCQ Class 10th Science
Question :-
1. Which of the following is not due of refraction?
(i)The bottom of bucket seems elevated
(ii)Rainbow Formation
(iii)Inverted Image Formed in spoon
(iv)Star appears twinkling
2. How the focal length will vary if the lens is kept in water?
(i)It will increase
(ii)It will decrease
(iii)It will remain same
(iv)It will no longer work as lens
3. A convex mirror is painted from one side, how can it behave like?
(i)A convex mirror
(ii)A concave mirror
(iii)A diverging lens
(iv)A plane mirror
4.Which of the following forms only real inverted image?
(i)Concave mirror
(ii)Convex Mirror
(iii)Covex Lens
(iv)None of these
5. Which of following will converge more having Focal lengths as given below?
(i)2cm
(ii)4cm
(iii)-1.5cm
(iv)-5cm
6. Which of the following lens will diverge the ray of light more?
(i)2D
(ii)1D
(iii)-0.4D
(iv)-0.8D
7. Two lens of power +2.3D and -1.3D is combined. What is the focal length of combination of lens?
(i)+2m
(ii)-4m
(iii)-1cm
(iv)+1m
8.Which of the following thing not happen when a ray of light passes from one transparent medium to another?
(i)It deviates it’s path
(ii)It’s speed is changed
(iii)Frequency of light changes
(iv)Wavelength of light changes
9. A convex lens forms an double height inverted image placed at a distance of 6cm from the lens. What is the focal length of the lens?
(i)6cm
(ii)4cm
(iii)12cm
(iv)8cm
10. The magnification of an object placed at center of curvature of Concave mirror is?
(i)-1
(ii)-2
(iii)1
(iv)2
Chapter - 10 Light Reflection and Refraction Test 2 | Class - 10th Science
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Question 1 of 10
1. Question
Which of the following is not due of refraction?
Correct
Spoon is a mirror. The image is formed due to reflection of light.
Incorrect
Spoon is a mirror. The image is formed due to reflection of light.
-
Question 2 of 10
2. Question
How the focal length will vary if the lens is kept in water?
Correct
The focal length will increase.
Incorrect
The focal length will increase.
-
Question 3 of 10
3. Question
A convex mirror is painted from one side, how can it behave like?
Correct
It work as concave mirror.
Incorrect
It work as concave mirror.
-
Question 4 of 10
4. Question
Which of the following forms only real inverted image?
Correct
All can form virtual image.
Incorrect
All can form virtual image.
-
Question 5 of 10
5. Question
Which of following will converge more having Focal lengths as given below?
Correct
Since, the positive sign indicates the converging nature of the lens. Also, less focal length, more convergence will take place. So, lens with 2 cm focal length will converge more.
Incorrect
Since, the positive sign indicates the converging nature of the lens. Also, less focal length, more convergence will take place. So, lens with 2 cm focal length will converge more.
-
Question 6 of 10
6. Question
Which of the following lens will diverge the ray of light more?
Correct
The diverging lens is signified by negative sign. Also, more is the magnitude of the lens more is the more is the diverging power.
Incorrect
The diverging lens is signified by negative sign. Also, more is the magnitude of the lens more is the more is the diverging power.
-
Question 7 of 10
7. Question
Two lens of power +2.3D and -1.3D is combined. What is the focal length of combination of lens?
Correct
Total power is sum of all powers
+2.3D-1.3D = 1D
So, focal length 1/1D = 1/1m = 1mIncorrect
Total power is sum of all powers
+2.3D-1.3D = 1D
So, focal length 1/1D = 1/1m = 1m -
Question 8 of 10
8. Question
Which of the following thing not happen when a ray of light passes from one transparent medium to another?
Correct
Frequency of light remains same after refraction.
Incorrect
Frequency of light remains same after refraction.
-
Question 9 of 10
9. Question
A convex lens forms an double height inverted image placed at a distance of 6cm from the lens. What is the focal length of the lens?
Correct
Image distance v = ?
Object distance u = -6cm
Focal length f = ?
Magnification M = v/u =- 2 (double size inverted image)
So, v=2u =- 2 = -2×-6cm = 12cm
Lens formula
1/f =1/v -1/u
1/12 –(-1/6) = 1/12+1/6 = (1+2)/12 =3/12 = ¼
1/f = 1/4cm
f=4cm
So, focal length is 4cm.Incorrect
Image distance v = ?
Object distance u = -6cm
Focal length f = ?
Magnification M = v/u =- 2 (double size inverted image)
So, v=2u =- 2 = -2×-6cm = 12cm
Lens formula
1/f =1/v -1/u
1/12 –(-1/6) = 1/12+1/6 = (1+2)/12 =3/12 = ¼
1/f = 1/4cm
f=4cm
So, focal length is 4cm. -
Question 10 of 10
10. Question
The magnification of an object placed at center of curvature of Concave mirror is ?
Correct
Because, the image formed is at same distance from object, inverted and real. So, -1 will be the required magnification.
Incorrect
Because, the image formed is at same distance from object, inverted and real. So, -1 will be the required magnification.