Ch # 10
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Saim Academy of Computer Science 88/W.B Physics (1st)
Marks: 30
Ch 10 FULL
Test.No.12
Time: 1 hour
M.C.Q’S Q.1 i.
Encircle the best answer.cutting over-writing is not allowed
10
If a convex lens of focal length 5cm is used as simple microscope then its magnifying power will be:
a) 5 b) 6 c) 10 d) 25 The ability to reveal the minor detail of an object under examination is called: a) Resolving power b) magnification c) Scattering d) Reflecting If an object lies at focus point F in front of a convex lens, its image is formed at: a) 2F b) F c) 3F d) Infinity It becomes possible to send light into inaccessible places due to: a) Coaxial cable b) Fiber optic c) Copper wire d) Glass wire The light signal in optical fiber must be regenerated by a device called: a) Regenerator b) Generator c) Repeater d) Diode Critical angle is that incident angle in denser medium for which angle of refraction is: a) 00 b) 450 c) 1800 d) 900 The Detector in photo-phone is made up of: a) Cadmium b) Germanium c) Selenium d) Silicon If the speed of light in vacuum is C, then its velocity in a medium of refractive index 1.3 is: a) 1.3 c b) 1.3/c c) c/1.3 d) c For normal adjustment, the length of astronomical telescope is: a) f0 - fe b) f0 fe c) f0 + fe d) f0 / fe The plastic fiber is covered for protection by a: a) Glass Jacket b) Plastic Jacket c) Copper Jacket d) Aluminum Jacket
ii. iii. iv. v. vi. vii. viii. ix. x.
OBJECTIVE Q.2: Write the short answer. (Attempt any five questions) 1. What do you understand by linear magnification and angular magnification? Explain how a convex lens is used as a magnifier? 2. What is meant by resolving power, also tell which colour has more resolving power? 3. One can buy a cheap microscope for use by the children. The images seen in such a microscope Have coloured edges. Why is this so? 4. Make the the ray diagram when an object is placed b/w F and 2F in front of convex lens 5. How the light signal is transmitted through the optical fibre?
6. How power is lost in optical fibre through scattering and absorption?
EXTENSIVE
Q.3
(a) (b)
Describe the construction of compound microscope.Derive the expression for its magnifying power. A telescope is made of an objective of focal length 20 cm and an eye piece of 5.0 cm, both convex lenses. Find the angular magnification.
M.SHAFIQ M.Sc Mathematics
1a1a 2a 3d 4b 5c 6d 7d 8c 9c 10b
Marks: 30
Ch 10 FULL
Test.No.12
Time: 1 hour
M.C.Q’S Q.1 i.
Encircle the best answer.cutting over-writing is not allowed
10
If a convex lens of focal length 5cm is used as simple microscope then its magnifying power will be:
a) 5 b) 6 c) 10 d) 25 The ability to reveal the minor detail of an object under examination is called: a) Resolving power b) magnification c) Scattering d) Reflecting If an object lies at focus point F in front of a convex lens, its image is formed at: a) 2F b) F c) 3F d) Infinity It becomes possible to send light into inaccessible places due to: a) Coaxial cable b) Fiber optic c) Copper wire d) Glass wire The light signal in optical fiber must be regenerated by a device called: a) Regenerator b) Generator c) Repeater d) Diode Critical angle is that incident angle in denser medium for which angle of refraction is: a) 00 b) 450 c) 1800 d) 900 The Detector in photo-phone is made up of: a) Cadmium b) Germanium c) Selenium d) Silicon If the speed of light in vacuum is C, then its velocity in a medium of refractive index 1.3 is: a) 1.3 c b) 1.3/c c) c/1.3 d) c For normal adjustment, the length of astronomical telescope is: a) f0 - fe b) f0 fe c) f0 + fe d) f0 / fe The plastic fiber is covered for protection by a: a) Glass Jacket b) Plastic Jacket c) Copper Jacket d) Aluminum Jacket
ii. iii. iv. v. vi. vii. viii. ix. x.
OBJECTIVE Q.2: Write the short answer. (Attempt any five questions) 1. What do you understand by linear magnification and angular magnification? Explain how a convex lens is used as a magnifier? 2. What is meant by resolving power, also tell which colour has more resolving power? 3. One can buy a cheap microscope for use by the children. The images seen in such a microscope Have coloured edges. Why is this so? 4. Make the the ray diagram when an object is placed b/w F and 2F in front of convex lens 5. How the light signal is transmitted through the optical fibre?
6. How power is lost in optical fibre through scattering and absorption?
EXTENSIVE
Q.3
(a) (b)
Describe the construction of compound microscope.Derive the expression for its magnifying power. A telescope is made of an objective of focal length 20 cm and an eye piece of 5.0 cm, both convex lenses. Find the angular magnification.
M.SHAFIQ M.Sc Mathematics
1a1a 2a 3d 4b 5c 6d 7d 8c 9c 10b
