Physics questions
20027 published questions with worked solutions.
- A graph is drawn between thermo emf and the temperature difference between the junctions. The slope of the graph at any point on...
- Which of the following thermocouple produces the maximum thermo e. m. f. for the same temperature difference between hot and cold...
- When a number of thermocouple are joined in series, the thermo e. m. f.
- Thermocouple is an arrangement of two different metals to convert
- S.I. unit of Thomson Coefficient is.......
- An external resistance R is connected to a cell of internal resistance r. The power in the circuit is maximum when ?
- Neutral temperature of thermocouple is depends upon :
- What will be the temperature of cold junction if emf induced in thermocouple changes its direction at 600 K and neutral...
- Thermo emf is given by the equation e = at - 0.5 ,bt^2, where a = 16 and b = 0.08. If temperature of cold junction is 0^ then...
- The current in the conductor varies with time t as I = 2t + 3t^2. Electric charge flow through a section of the conductor during...
- With resistance P and Q in the left gap and right gap respectively, of a meter bridge. The null point is obtained at 60 cm from...
- A wire of resistance 16 is bent in to a circle and a cell of e. m. f. 2 V and internal resistance 1 is connected between two...
- Two equal resistances are introduced in two gaps of a metre bridge. The shift in the null point if an equal resistance is...
- With an unknown resistance X in the left gap and a resistance R in the right gap of a meter bridge, the neutral point is obtained...
- A resistance of potentiometer wire is 1 /m. A Daniel cell of e. m. f. 1.08 V balances at 216 cm on potentiometer. The current...
- A cell of e. m. f. 2 V and internal resistance 0.5 is connected across a resistor R. The current that flows is same as that, when...
- In comparing e. m. f. of two cells by a potentiometer, balance point is obtained on 5th wire, the current flowing through the...
- The internal resistance of an ideal cell is
- If the resistance across a 12 V source is increased by 4 . the current drops by 0.5 A. The original resistance was
- A voltmeter has a resistance of 80 . When it is connected to a battery of e. m. f. 6 V and of internal resistance 2 , the reading...