12th Physics Monthly Test - 1( Current Electricity)

St. Britto Hr. Sec. School - Madurai

12th Physics Monthly Test - 1( Current Electricity)-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The specific resistance of silicon is__________

0.46
10X10^-8
3200
2300

conductivity is the reciprocal of

resistance
specific resistance
conductance
potential difference

The emf of a battery is 3 volts and internal resistance 0.125 \(\Omega \) . The difference of potential
at the terminal of battery when connected across an external resistance of 1 \(\Omega \) is

1.67 V
0.67 V
2.67 V
3.67 V

In a potentiometer a cell of emf 1.5 V balances at a length of 270 cm. If another cell balances at 360 cm for the same current its emf will be

1 V
2 V
3 V
0.75 V

Conductor which obey ohm's law are called.

dielectrics
superconductors
ohmic conductors
semiconductors

Kirchhoff's I law is named as_____________

ohm's law
voltage law
resistance law
current law

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 resistance of mercury is "0" when its temperature is reduced to_____

4.2°C
2.4°K
4.2 K
-268.8 K

Which of the following has negative temperature coefficient of resistance?

copper
tungsten
carbon
silver

A bird sitting on an insulated wire carrying a current feels quite safe because

the bird is a non-conductor of electricity
resistance of the bird is very large
there is a large potential difference between bird and wire
there is no potential difference between bird and wire

In Kirchhoff's II law) the current in clockwise direction is taken as________

positive
negative
neutral
no direction

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?
\(10\Omega \)

\(20\Omega \)

\(30\Omega \)

\(40\Omega \)
In a large building, there are 15 bulbs of 40W, 5 bulbs of 100W, 5 fans of 80W and 1 heater of 1kW are connected. The voltage of electric mains is 220V. The minimum capacity of the main fuse of the building will be
14 A

8 A

10 A

12 A

The electrical resistivity drops to zero for__________

conductors
insulators
super conductors
semiconductors

The unit of temperature coefficient of resistance is_______.

°C
°C^-1
-C^-2
°C²

A wire connected to a power supply of 230 V has power dissipation P₁. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case power dissipation is P₂. The ratio \(\frac{P_2}{P_1}\) is

Part - B

Generic 2 - Answer All Question

What is seeback effect?
What is conductor?

Derive the expression for power P=VI in electrical circuit.

Why the resistance of the conductor increases with rise in temperature.

Define resistance

The resistivity of materials depends upon what parameters?

What is superconductivity?

State microscopic form of Ohm’s law.

What is Thomson effect?

What is meant by Heating effect of electric current?

When resistors are connected in series. the effective resistance is increased. Why?
why is terminal voltage of a cell less than its emf?

When resistors are connected in parallel the effectiveresistance is reduced. Why

Draw V - I graph for ohmic & non -ohmic materials. give example

What is the effective resistance of resistors connected in series

State macroscopic form of Ohm’s law.

Two wires A & B are of the same metal of of same length have area of cross section in the
ratio of 2 : If the same potential difference is applied across each wire. What will be the retro of the circuit flowing in A & B?

Part - C

Generic 3 - Answer All Question

How does one can understand the temperature dependence of resistivity of a conductor?
Calculate the equivalent resistance for the circuit which is connected to 24 V battery and also find the potential difference across 4 Ω and 6 Ω resistors in the circuit.

The resistance of a wire is 20 Ω. What will be new resistance, if it is stretched uniformly 8 times its original length?

Derive an expression of drift velocity and write the relation between drift velocity and mobility.

Calculate the equivalent resistance in the following circuit and also find the current I, I₁ and I₂ in the given circuit.

What are carbon resistors? What does the colour indicates?

Compute the current in the wire if a charge of 120 C is flowing through a copper wire in 1 minute.

Resistance of a material at 10⁰C and 40⁰C are 45 Ω and 85 Ω respectively. Find its temperature co-efficient of resistance.

Explain Peltier effect.

Find the expression for the equivalent emf & internal resistance of the series combination of cells

If the resistance of coil is 3 Ω at 20^oC and α = 0.004/^oC then determine its resistance at 100^oC.
In a circuit containing internal resistance r. Find the power delivered

Part - D

Generic 5 - Answer All Question

From the given circuit,

Find
i) Equivalent emf of the combination
ii) Equivalent internal resistance
iii) Total current
iv) Potential difference across external resistance
v) Potential difference across each cell

How will you represent a resistor of 3700\(\Omega \) ± 10 by colour code?

Write mathematical relation between mobility & drift velocity of charge carriers in a conductor (ii) mobility & relaxation time (or) mean free time.

How the emf of two cells are compared using potentiometer?
A cell supplies a current of 0.9 A through a 2 Ω resistor and a current of 0.3 A through a 7 Ω resistor. Calculate the internal resistance of the cell.

The resistance of a nichrome wire at 0 0C is 10 Ω. If its temperature coefficient of resistance is 0.004/⁰C, find its resistance at boiling point of water. Comment on the result.

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12th Physics Monthly Test - 1( Current Electricity)

St. Britto Hr. Sec. School - Madurai

12th Physics Monthly Test - 1( Current Electricity)-Aug 2020

Part - A

Multiple Choice Question - Answer All Question

The specific resistance of silicon is__________

conductivity is the reciprocal of

The emf of a battery is 3 volts and internal resistance 0.125 \(\Omega \) . The difference of potential at the terminal of battery when connected across an external resistance of 1 \(\Omega \) is

In a potentiometer a cell of emf 1.5 V balances at a length of 270 cm. If another cell balances at 360 cm for the same current its emf will be

Conductor which obey ohm's law are called.

Kirchhoff's I law is named as_____________

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

The resistance of mercury is "0" when its temperature is reduced to_____

Which of the following has negative temperature coefficient of resistance?

A bird sitting on an insulated wire carrying a current feels quite safe because

In Kirchhoff's II law) the current in clockwise direction is taken as________

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?

In a large building, there are 15 bulbs of 40W, 5 bulbs of 100W, 5 fans of 80W and 1 heater of 1kW are connected. The voltage of electric mains is 220V. The minimum capacity of the main fuse of the building will be

The electrical resistivity drops to zero for__________

The unit of temperature coefficient of resistance is_______.

A wire connected to a power supply of 230 V has power dissipation P1. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case power dissipation is P2. The ratio \(\frac{P_2}{P_1}\) is

Part - B

Generic 2 - Answer All Question

What is seeback effect?

What is conductor?

Derive the expression for power P=VI in electrical circuit.

Why the resistance of the conductor increases with rise in temperature.

Define resistance

The resistivity of materials depends upon what parameters?

What is superconductivity?

State microscopic form of Ohm’s law.

What is Thomson effect?

What is meant by Heating effect of electric current?

When resistors are connected in series. the effective resistance is increased. Why?

why is terminal voltage of a cell less than its emf?

When resistors are connected in parallel the effectiveresistance is reduced. Why

Draw V - I graph for ohmic & non -ohmic materials. give example

What is the effective resistance of resistors connected in series

State macroscopic form of Ohm’s law.

Two wires A & B are of the same metal of of same length have area of cross section in the ratio of 2 : If the same potential difference is applied across each wire. What will be the retro of the circuit flowing in A & B?

Part - C

Generic 3 - Answer All Question

How does one can understand the temperature dependence of resistivity of a conductor?

Calculate the equivalent resistance for the circuit which is connected to 24 V battery and also find the potential difference across 4 Ω and 6 Ω resistors in the circuit.

The resistance of a wire is 20 Ω. What will be new resistance, if it is stretched uniformly 8 times its original length?

Derive an expression of drift velocity and write the relation between drift velocity and mobility.

Calculate the equivalent resistance in the following circuit and also find the current I, I1 and I2 in the given circuit.

What are carbon resistors? What does the colour indicates?

Compute the current in the wire if a charge of 120 C is flowing through a copper wire in 1 minute.

Resistance of a material at 100C and 400C are 45 Ω and 85 Ω respectively. Find its temperature co-efficient of resistance.

Explain Peltier effect.

Find the expression for the equivalent emf & internal resistance of the series combination of cells

If the resistance of coil is 3 Ω at 20oC and α = 0.004/oC then determine its resistance at 100oC.

In a circuit containing internal resistance r. Find the power delivered

Part - D

Generic 5 - Answer All Question

From the given circuit, Find i) Equivalent emf of the combination ii) Equivalent internal resistance iii) Total current iv) Potential difference across external resistance v) Potential difference across each cell

How will you represent a resistor of 3700\(\Omega \) ± 10 by colour code?

Write mathematical relation between mobility & drift velocity of charge carriers in a conductor (ii) mobility & relaxation time (or) mean free time.

How the emf of two cells are compared using potentiometer?

A cell supplies a current of 0.9 A through a 2 Ω resistor and a current of 0.3 A through a 7 Ω resistor. Calculate the internal resistance of the cell.

The resistance of a nichrome wire at 0 0C is 10 Ω. If its temperature coefficient of resistance is 0.004/0C, find its resistance at boiling point of water. Comment on the result.

Comment

Other Study material

The emf of a battery is 3 volts and internal resistance 0.125 \(\Omega \) . The difference of potential
at the terminal of battery when connected across an external resistance of 1 \(\Omega \) is

A wire connected to a power supply of 230 V has power dissipation P₁. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case power dissipation is P₂. The ratio \(\frac{P_2}{P_1}\) is

Two wires A & B are of the same metal of of same length have area of cross section in the
ratio of 2 : If the same potential difference is applied across each wire. What will be the retro of the circuit flowing in A & B?

Calculate the equivalent resistance in the following circuit and also find the current I, I₁ and I₂ in the given circuit.

Resistance of a material at 10⁰C and 40⁰C are 45 Ω and 85 Ω respectively. Find its temperature co-efficient of resistance.

If the resistance of coil is 3 Ω at 20^oC and α = 0.004/^oC then determine its resistance at 100^oC.

From the given circuit,

Find
i) Equivalent emf of the combination
ii) Equivalent internal resistance
iii) Total current
iv) Potential difference across external resistance
v) Potential difference across each cell

The resistance of a nichrome wire at 0 0C is 10 Ω. If its temperature coefficient of resistance is 0.004/⁰C, find its resistance at boiling point of water. Comment on the result.