The temperature coefficient of a resistance wire is 0.00125 per degree. The resistance at 300 K is 1 Ω. At what temperature its resistance will be 2Ω?
Options
(a) 1154 K (b) 1127 K […]
Four cells, each of emf E and internal resistance r, are connected in series across an external resistance R. By mistake one of the cells is connected in reverse. Then, the current in the external […]
Two identical cells of the same e.m.f. and same internal resistance give the same current through an external resistance of 2 Ω, regardless of whether they are connected in series or in parallel. The internal […]
The unit of specific conductivity is
Options
(a) Ohm⁻¹ cm⁻¹ (b) Ohm cm⁻² (c) Ohm-cm (d) Ohm⁻¹ cm⁻²
Correct Answer:
Ohm⁻¹ cm⁻¹
Explanation:
No explanation available. Be the first to write the explanation […]
The equivalent resistance of two resistors connected in series is 6 Ω and their parallel equivalent resistance is 4/3Ω. What are the values of resistances?
Options
(a) 4Ω,6Ω (b) 8Ω,1Ω (c) 4Ω,2Ω (d) 6Ω,2Ω
Dimensional formula for electrical resistance R is given by
Options
(a) [M¹L²T⁻³I⁻²] (b) [ML²T⁻³I⁻²] (c) [ML²T³I⁻²] (d) [ML²T³I²]
Correct Answer:
[M¹L²T⁻³I⁻²]
Explanation:
No explanation available. Be the first to write the explanation for […]
A uniform wire of resistance 9Ω is joined end-to-end to form a circle. Then, the resistance of the circular wire between any two diametrically points is
Options
(a) 6Ω (b) 3Ω (c) 9/4Ω […]
The e.m.f. of a battery is 2 V and its internal resistance is 0.5 Ω. The maximum power which it can deliver to any external circuit will be
Options
(a) 8 watt (b) […]
The temperature coefficient of resistance of an alloy used for making resistor is
Options
(a) small and positive (b) small and negative (c) large and positive (d) large and negative
Correct Answer:
small […]
The dimensions of mobility of charge carriers are
Options
(a) [M⁻²T²A] (b) [M⁻¹T²A] (c) [M⁻²T³A] (d) [M⁻¹T³A]
Correct Answer:
[M⁻¹T²A]
Explanation:
Mobility = drift velocity / electric field μ = v(d) / E = […]
2017 Copyright Doctor Dreams Training Academy