
- ✓C
- B$\frac{c}{2}$
- C2C
- D$\frac{2}{C}$

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A thin equiconvex lens is made of glass of refractive index 1.5 and its focal length is 0.2 m, if it acts as a concave lens of 0.5 m focal length when dipped in a liquid, the refractive index of the liquid is
|
(a) |
(b) |
(c) |
(d) |
Three resistors each of 4Ω are connected together to form a network. The equivalent resistance of the network cannot be
|
(a) 1.33 Ω |
(b) 3.0 Ω |
(c) 6.0 Ω |
(d) 12.0 Ω |
A 5 ℃ rise in the temperature is observed in a conductor by passing some current. When the current is doubled, then rise in temperature will be equal to
|
(a) 5 ℃ |
(b) 10 ℃ |
(c) 20 ℃ |
(d) 40 ℃ |

Among the following properties describing diamagnetism identify the property that is wrongly stated
|
(a) Diamagnetic material do not have permanent magnetic moment |
|
(b) Diamagnetism is explained in terms of electromagnetic induction |
|
(c) Diamagnetic materials have a small positive susceptibility |
|
(d) The magnetic moment of individual electrons neutralize each other |
The wavelength of emission line spectrum and absorption line spectrum of a substance are related as
|
(a) Absorption has larger value |
(b) Absorption has smaller value |
|
(c) They are equal |
(d) No relation |