Physics - Thermal and Chemical Effects of Currents Question Paper 1
Exam Duration: 45 Mins Total Questions : 5
The commercial aluminium (trivalent atomic weight = 27) is generally obtained by electrolysis. The total charge required to deposit 9 gram of aluminium is
- (a)
3266.6 coulomb
- (b)
96500 coulomb
- (c)
6.024 X 1023 coulomb
- (d)
65900 coulomb
Thermocouple is based on the principle of
- (a)
Seebeck effect
- (b)
Peltier effect
- (c)
Thomson effect
- (d)
Joule effect
As the temperature of the hot junction in a thermocouple increases, the thermoelectromotive force
- (a)
always increases with temperature
- (b)
first increases with temperature but never becomes negative
- (c)
is always positive
- (d)
may be zero, positive or negative
There are two elctric bulbs of 40W and 100W. Which one will be brighter when first they are connected in series and then in parallel
- (a)
40W in series and 100W in parallel
- (b)
100W in series and 40W in parallel
- (c)
40W both i series and parallel will be uniform
- (d)
100W both in series and parallel will be uniform
When a difference of temperature is maintained across a single conductor, and a current is placed through it; heat is either evolved or absorbed. This effect is called
- (a)
Seeback effect
- (b)
Pettier effect
- (c)
Thomson effect
- (d)
Joule effect