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With rises the temperature, resistance of carbon____.

increases

decreases

remains the same

first increases then decreases

With rises the temperature, resistance of a semiconductor material germanium or silicon) _____________.

increases

decreases

remains the same

first increases then decreases

In the Bohr’s model of hydrogen atom, the electron moves around the nucleus in a circular orbit of radius 5x 10-11 meters. If its time period is 1.2 x 10-16 s, then current associated with the electron motion is ____,

zero

1.6 x 10-19 A

0.17 A

1.07 X 10-3 A

Two identical heater coils are connected in parallel across the mains. If one of the coils breaks, then other coil ____.

will also not be heated

develop a higher temperature

develop a lower temperature

will develop the same amount

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 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

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

For which of the following, dependence of drift velocity vd on electric field E is Ohm’s law obeyed?

The terminal potential difference of a cell is greater than its e.m.f. when it is ____.

being discharged

in open circuit

being charged

being either charged or discharged

increases

decreases

remains the same

first increases then decreases

With rises the temperature, resistance of a semiconductor material germanium or silicon) _____________.

increases

decreases

remains the same

first increases then decreases

In the Bohr’s model of hydrogen atom, the electron moves around the nucleus in a circular orbit of radius 5x 10-11 meters. If its time period is 1.2 x 10-16 s, then current associated with the electron motion is ____,

zero

1.6 x 10-19 A

0.17 A

1.07 X 10-3 A

Two identical heater coils are connected in parallel across the mains. If one of the coils breaks, then other coil ____.

will also not be heated

develop a higher temperature

develop a lower temperature

will develop the same amount

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 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

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

For which of the following, dependence of drift velocity vd on electric field E is Ohm’s law obeyed?

The terminal potential difference of a cell is greater than its e.m.f. when it is ____.

being discharged

in open circuit

being charged

being either charged or discharged

Tppics included are temperature of resistance,e.m.f, p.d,drift velocity,potentiometer ,heating effect of current, metre bridge

IIT JEE Physics: Electricity Current Electricity AIPMT Physics: Current Electricity AIEEE Physics: Current electricity XII CBSE I.SC

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