The V-i graph for a conductor makes an angle θ with V-axis. Here V denotes the voltage and i denotes current. The resistance of conductor is given by
|
(a) sin θ |
(b) cos θ |
(c) tan θ |
(d) cot θ |
(d) cot θ
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In which one of the following regions of the electromagnetic spectrum will the vibrational motion of molecules give rise to absorption
|
(a) Ultraviolet |
(b) Microwaves |
(c) Infrared |
(d) Radio waves |
If two wires having resistance R and 2R. Both joined in series and in parallel then ratio of heat generated in this situation, applying the same voltage,
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 2 : 9 |
(d) 9 : 2 |
What is the potential energy of the equal positive point charges of 1μC each held 1 m apart in air
|
(a) 9 |
(b) 9 |
(c) 2 eV/m |
(d) Zero |
A lens which has focal length of 4 cm and refractive index of 1.4 is immersed in a liquid of refractive index 1.6, then the focal length will be
|
(a) – 12.8 cm |
(b) 32 cm |
(c) 12.8 cm |
(d) – 32 cm |
