# XII_Physics_Current Electricity_4 Online Test

A current of 5 amperes is passing through a metallic wire of cross-section area 4 x 10-6 m2. If the density of the charge carrier in the wire is 5 x 1026/m3, the drift velocity of the electrons is ____.
1/8 m/s
1/16 m/s
1/64 m/s
1/78 m/s
What constitutes current in a metal wire?
electrons
protons
atoms
molecules
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
Kirchhoff’s second law is based on the law of conservation of ____.
charge
energy
momentum
sum of mass and energy
If three 2 ohms resistance are connected to from a triangle, then equivalent resistance between any two corners is ____.
6 ohms
2 ohms
¾ ohms
4/3 ohms
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
The direction of current in an iron-copper thermocouple is :
From copper to iron at the hot junction
From iron to copper at the hot junction
From copper to iron at cold junction
No current will flow
The true statement for thermo e.m.f. of a thermocouple :
Depends on the nature of metals
Depends only on temperature of cold junction
Depends only on temperature of hot junction
Depends on the length of the wires used for thermocouple
Thermocouple is a device for the measurement of :
Absolute temperature of a metal
The temperature difference between two substances
The couple acting on a wire
Thermal conductivity of a substance
The thermocouple is based on the principle of :
Seebeck effect
Thomson effect
Peltier effect
Joule effect
Description:

This test consist of 10 questions.Students should ideally take 10 minutes to complete the test. This test is useful for those students who are preparing for IIT JEE, AIEEE or any other engineering entrance test. This test consist of questions from Current Electricity and which, in general, is focused in AIEEE and IIT JEE. In this chapter, Cells, emf and internal resistance are key topic and mostly application based questions are asked.

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