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12th Physics weekly Test - 3 ( Current Electricity )

St. Britto Hr. Sec. School - Madurai

12th Physics weekly Test - 3 ( Current Electricity )-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

The direction of conventional current is taken as the direction of flow of

positive charges
same direction of flow of electron
opposite to positive charges
all of these

For which of the following substances, resistance decreases with temperature?

copper
platinum
mercury
carbon

Two identical resistors are connected in parallel then connected in series. The effective resistance are in the ratio

1:2
2:1
1:4
4:1

The temperature Coetti unit of tungsten is________(oC)^-1

3.9 x 10^-3
4.9 x 10^-3
5.0 X 10^-3
4 x 10^-3

The heating element that does not oxidize readily is an alloy of metals made of

Nickel and Iron
Nickel and Chromium
copper and Manganin
Nickel and Copper

Copper Wire metals and burns out when the current increases above______

5 A
10 A
25 A
25 A

The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 Ω is

0.2 Ω
0.5 Ω
0.8 Ω
1.0 Ω

The phenomenon of superconductivity was first observed by__________

George Simon Ohm
Volta
Faraday Onnes
Kammerlingh Onnes

Which energy is used to liberate the outer electron from the individual atoms?

Thermostatic external energy
Thermodynamic internal energy
Thermodynamic external energy
Thermostatic internal energy

The tolerance of sliver ring in resistors is_________

5%
10%
20 %
2 %

Nichrome wire is used as the heating element because it has

low specific resistance
low melting point
high specific resistance
high specific resistance

In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60W bulb for use in India is R, the resistance of a 60W bulb for use in USA will be

R
2R
\(\frac{R}{4}\)
\(\frac{R}{2}\)

The drift velocity is equal to mobility when__________

the electric field is parallel to the motion of electrons'
the electric field is unity
the absence of electric field
either (a) or (b)

In an electric circuit fuse wire is connected in

parallel
star connection
delta connection
series

A potential difference is applied an the ends of a metallic wire. If the potential difference is doubled, the drift velocity

will be doubled
will be halved
will be quadrupled
will remain unchanged

When three resistors are connected in parallel then the value of the effective resistance is________

less than or equal to individual resistance
greater than or equal to individual resistance
less than the individual resistance
greater than the individual resistance

Which of the following is an identical.

germanium, silicon
silver, wood
aluminum, constantan
bakelite, iron

Relation between current density and drift velocity is_________

en V_d
nAeV_d
\(\cfrac { n }{ e{ V }_{ d } } \)
\(\cfrac { { V }_{ d } }{ ne } \)

Kirchoff's I law i.e, \(\Sigma i=0\) at a junction, deals with the conservation of

charge
energy
momentum
angular momentum

The resistivity of a wire depends on

length
material
area of cross section
all the above

For super conductors, the magnetic flux lines are________

included
excluded
0
maximum

conductivity is the reciprocal of

resistance
specific resistance
conductance
potential difference

Peltier effect is the converse of

Joule effect
Raman effect
Thomson effect
Seebeck effect

Kirchhoff's law is applicable only for__________

simple circuits
primary circuits
complicated circuits
secondary circuits

The sensitivity of a potentiometer can be increased by

decreasing the length of potentiometer wire
increasing the length of potentiometer wire
increasing the emf of the cell used in primary circuit
all the above

An unknown resistance is connected in parallel with a 15\(\Omega \) resistance and a 12V battery. What is the value of the unknown resistance if the current in the circuit is 2A?

\(10\Omega \)
\(20\Omega \)
\(30\Omega \)
\(40\Omega \)

A cell of emf 2.2V sends a current of O.2A through a resistance of 10 n. The internal resistance of the cell is____________

0.1\(\Omega \)
1\(\Omega \)
2\(\Omega \)
1.33\(\Omega \)

Carbon are furnaces produce temperature upto________

1500^oC
2000^o C
2500^oC
3000^oC

Current is a______

vector quantity
scalar quantity
particular direction
All the above

The unit of current density is________

Am^-2
Am²
A²m-²
A^-2m^-2

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