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197 questions found · practise this subject as a set Show 20 · 50 per page

#	Question	Subject and topic	Difficulty
121	The ozone layer in the upper atmosphere protects living things mainly by absorbing:	Physics Electromagnetic spectrum	Medium
122	An electromagnetic wave has a frequency of 10 GHz. What are its wavelength and the band it belongs to?	Physics Electromagnetic spectrum	Hard
123	A spherical mirror has a radius of curvature of 24 cm. What is the magnitude of its focal length?	Physics Reflection by spherical mirrors	Easy
124	The image formed by a convex mirror of a real object is always:	Physics Reflection by spherical mirrors	Easy
125	An object is placed 20 cm in front of a concave mirror of focal length 15 cm. Where is the image and what is …	Physics Reflection by spherical mirrors	Medium
126	An object is placed 20 cm in front of a convex mirror of radius of curvature 40 cm. Where is the image?	Physics Reflection by spherical mirrors	Medium
127	A person stands 10 cm from a concave shaving mirror of focal length 15 cm. Which description of the image is …	Physics Reflection by spherical mirrors	Hard
128	The working of an optical fibre is based on:	Physics Refraction and total internal reflection	Easy
129	A water tank is 12 cm deep. Viewed from directly above, how deep does it appear? (Refractive index of water =…	Physics Refraction and total internal reflection	Easy
130	What is the critical angle for light going from a medium of refractive index √2 into air?	Physics Refraction and total internal reflection	Medium
131	Diamond sparkles more than glass cut to the same shape mainly because diamond has:	Physics Refraction and total internal reflection	Medium
132	A point object in air is 30 cm from the convex surface of a large glass block (n = 1.5). The radius of curvat…	Physics Refraction and total internal reflection	Hard
133	What is the power of a concave lens of focal length 25 cm?	Physics Lenses	Easy
134	An object is placed 30 cm in front of a convex lens of focal length 20 cm. What are the image distance and ma…	Physics Lenses	Medium
135	An equiconvex glass lens (n = 1.5) has both radii of curvature equal to 20 cm. What is its focal length?	Physics Lenses	Medium
136	Two thin lenses of power +5 D and –3 D are placed in contact. What is the focal length of the combination?	Physics Lenses	Medium
137	A glass convex lens (n = 1.5) has a focal length of 20 cm in air. What is its focal length when fully immerse…	Physics Lenses	Hard
138	A thin prism of angle 5° is made of glass of refractive index 1.5. What is its deviation of a ray?	Physics Prism	Easy
139	When white light passes through a glass prism, which colour is deviated the most?	Physics Prism	Easy
140	An equilateral glass prism gives a minimum deviation of 30°. What is the refractive index of the glass?	Physics Prism	Medium