ICSE Class 10 Ray Optics and Optical Instruments — Mock Test

Free online mock test for Ray Optics and Optical Instruments (ICSE Class 10 Physics) — 88 competency-based questions with instant marking. Try the samples below, then take the full test free.

Sample questions

1. 1.A prism of refracting angle 60 degrees is made of glass of refractive index 1.5. The angle of minimum deviation is (given sin 48.6 = 0.75, A/2 = 30):
   • A.30 degrees
   • B.37.2 degrees
   • C.48.6 degrees
   • D.60 degrees
2. 2.A double convex lens has surfaces of radii 10 cm and 15 cm and a focal length of 12 cm in air. Its refractive index is:
   • A.1.33
   • B.1.5
   • C.1.62
   • D.2.0
3. 3.A convex lens has a focal length of 25 cm. Its power in dioptres is:
   • A.+2 D
   • B.+4 D
   • C.+0.25 D
   • D.+25 D
4. 4.Assertion (A): The image of a long object lying along the principal axis of a concave mirror is distorted. Reason (R): The longitudinal magnification along the axis is not the same as the transverse magnification, so different parts of the object are magnified differently.
   • A.Both A and R are true and R is the correct explanation of A
   • B.Both A and R are true but R is NOT the correct explanation of A
   • C.A is true but R is false
   • D.A is false but R is true
5. 5.The speed of light in a medium of refractive index 1.5 is (take c = 3 x 10^8 m/s):
   • A.3 x 10^8 m/s
   • B.2 x 10^8 m/s
   • C.1.5 x 10^8 m/s
   • D.4.5 x 10^8 m/s