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A thin lens with focal length f to be used as magnifying glass. Which of the following statements regarding the situation is true?
Five resistors of given values are connected together as shown in the figure. The current in the arm BD will be
|
(a) Half the current in the arm ABC |
(b) Zero |
|
(c) Twice the current in the arm ABC |
(d) Four times the current in the arm ABC |
A P-type semiconductor can be obtained by adding
|
(a) Arsenic to pure silicon |
(b) Gallium to pure silicon |
|
(c) Antimony to pure germanium |
(d) Phosphorous to pure germanium |
A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is 2/3. Their equivalent focal length is 30 cm. What are their individual focal lengths
|
(a) – 75, 50 |
(b) – 10, 15 |
(c) 75, 50 |
(d) – 15, 10 |
Mixed 
and 
ions (mass of 
and that of 
beam passes a region of constant perpendicular magnetic field. If kinetic energy of all the ions is same then
|
(a) |
|
(b) |
|
(c) All the ions will be deflected equally |
|
(d) No ions will be deflected |
A transparent cube of 15 cm edge contains a small air bubble. Its apparent depth when viewed through one face is 6 cm and when viewed through the opposite face is 4 cm. Then the refractive index of the material of the cube is
|
(a) 2.0 |
(b) 2.5 |
(c) 1.6 |
(d) 1.5 |
If 
and 
be the size of the images respectively for the two positions of lens in the displacement method, then the size of the object is given by
|
(a) |
(b) |
(c) |
(d) |
