Current Electricity for AIEEE and IIT JEE Physics Online Test

A 4 (F capacitor, a resistance of 2.5 M( is in series with 12 V battery. Find the time after which the potential difference across the capacitor is 3 times the potential difference across the resistor. [Given In (2)= 0.693]
13.86s
6.93s
7s
1.4s
Unit of conductance can’t be expressed in ____.
mho
(ohm)-1
siemen
ohm m-1
Which switch in the circuit when closed will produce short-circuiting? 
A
B
C
None of the above
A potentiometer wire, 10 m long has resistance 40 ohms. If it is put in series to a resistance 760 ohms and connected to a 2 volts battery, then potential gradient in the wire is ____.
1 x 10-2 volt/m
1 x 10-3 volt/m
1 x 10-4 volt/m
1 x 10-5 volt/m
If a resistance 5 is connected in the left gap of a meter bridge and 15 in the other gap then position of balancing point is
10 cm
20 cm
25 cm
75 cm
A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if
Both the length and the radius of the wire are halved.
Both the length and the radius of the wire are doubled
The radius of the wire is doubled
The length of the wire is doubled
The temperature coefficient of resistance of a wire is 0.00125 peroC. At 300 k, its resistance is I ohm. This resistance of the wire will be 2 ohm at.
1154oK
1100oK
1400oK
1127oK
Unit of specific resistance is ____.
ohm
ohm-s
ohm-metre
ohm per metre
A battery of 20 cells (each having e.m.f. 1.8 volt and internal resistance 0.1 ohm) is charged by 220 volts and the charging current is 15A. The resistance to be put in the circuit is ____.
10.27 ohms
12.27 ohms
8.62 ohms
16.24 ohms
In comparing e.m.f two cells with the help of a potentiometer, at the balance point, the current flowing through the wire is taken from ____.
one of these cells
both of these cells
the battery in the circuit
none of these
Description:

The test is based on working of potentiometer, meter bridge, combination of cells,conductance,temperature co-efficient of Resistance, heating effect and time constant of R-C circuits and is very helpful for AIEEE and IIT JEE preparation.

Discussion

devapi

why dont you provide with elaborate explanatiions???
WEIRD!!!!!1

4083 days 18 hours 13 minutes ago

GOPIKA

Its better to provide more explanatary answers . . . .

4379 days 13 hours 57 minutes ago

ANI

PLEASE PROVIDE EXPLANATORY ANSWERS FOR ALL QUESTIONS ALONG WITH SHORTCUT TECHNIQUES. YHANK YOU

4433 days 5 hours 58 minutes ago

shruti

I think there should be some explanations for the answers

4463 days 19 hours 3 minutes ago

Sibin

It'd be more helpful if you are giving some short explanation or related formulas along with it. Thank You

4480 days 1 hours 52 minutes ago

Kajal Sengupta
Physics 9th to 12 th grade,CIE, Edexcel, AP, IB , CBSE, ICSE
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