NEW
Font size
WorksheetsCurrent electricity
Total questions: 10
Worksheet time: 9mins
The instrument for the accurate determination of the emf of the cell is
Voltmeter
ammeter
potentiometer
slide wire bridge
One meter long metallic wire is broken into two unequal parts P and Q. The part P is uniformly extended into another wire R. Length of R is twice the length of P and the resistance of R is equal to that of Q. The ratio of resistances of P and R is _______
1:4
1:2
3:2
none of these
For which of the following dependence of drift velocity Vd on electric field E, Ohm's law is obeyed?
Vd ∝E2
Vd ∝E
Vd ∝E
Vd ∝E0
A steady current flows in a metallic conductor of non-uniform cross section. The quantity/quantities constant along the length of the conductor is/are :
drift speed only
current, electric field and drift speed
current and drift speed
current only
When a potential difference is applied across, the current passing through
an insulator at 0 K is zero
a semiconductor at 0 K is zero
a p-n diode at 300 K is finite if it s reverse biased
All the options are correct
If an electric current is passed through a nerve, the man
laughs
weeps
is excited
becomes insensitive to pain
A technician has only two resistors. By using them singly in series or in parallel, he is able to obtain the resistances of values 3,4,12 and 16 ohms. What are the resistances of the two coils?
6 Ω and 10 Ω
4 Ω and 12 Ω
7 Ω and 9 Ω
5 Ω and 12 Ω
Find the equivalent resistance between X1 and X2
2 ohm
3 ohm
4 ohm
1 ohm
If 100 W bulb and 60 W bulb is connected in parallel ______ bulb/ bulbs glows brighter.
60 W
100 W
both 100 W and 60 W
neither 100 W or 60 W
When current flows through a junction of 2 dissimilar metals heat is evolved or absorbed at the junction. This process is called ________
seebeck effect
joule effect
Peltier effect
Thomson effect
