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Physics Objectives > Ch 3. Current Electricity > Flashcards

Ch 3. Current Electricity Flashcards

1
Q

The relation between the drift velocity (V d) and applied electric field (E) of a conductor is

A

V d ∝ E

V d Proportional To E

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2
Q

Two resistors R and 2R are connected in series in an electric circuit. The thermal energy developed in R and 2R will be in ratio

A

1:2

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3
Q

The motion of electron inside the conductor is

A

Drifting

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4
Q

What is mainly measured by potentiometer?

A

Potential Difference

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5
Q

One ampere is equal to

A

1 coulomb/1 second

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6
Q

Unit of electromotive force is

A

Volt

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7
Q

Which of the following is correct for resistivity of a material?

A

P = RA/L

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8
Q

The heat produced in a conductor of resistance R due to flow of current I for time t is

A

I².R.t

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9
Q

Value of green colour code on carbon resistance is

A

5

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10
Q

The value of yellow colour in colour code of carbon resistance is

A

4

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11
Q

Which of the following is the best conductor of electricity?

A

Silver

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12
Q

Which of the following is the same in parallel connection of resistances?

A

Potential difference

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13
Q

1 volt is equal to

A

1JC⁻¹

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14
Q

The value of red colour in colour code of carbon resistance is

A

2

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15
Q

At constant potential difference, the resistance of any electric circuit is halved, the value of heat produced will be

A

Double

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16
Q

The current flowing in a wire is 1A. If the charge of an electron is 1.6 × 10¹⁹C, then the number of electrons flowing through the wire per second is

A

6.25 × 10¹⁸

17
Q

When two bulbs of power 60W and 40W are connected in series, then the power of their combination will be

A

24W

18
Q

The specific resistance of a conductor increases with

A

Increase of temperature

19
Q

The drift velocity (Vd) and applied electric field (E) of a conductor are related as :

A

Vd ∝ E

20
Q

Two cells of e.m.f. ε₁ and ε₂, internal resistance r₁ and r₂, connected in parallel. The equivalent e.m.f. of the combination is

A

ε₁ r₂ + ε₂ r₁/ r₁ + r₂

21
Q

Which element is used in electric heater?

A

Nichrome

22
Q

Absorbed electrical energy is

A

Proportional to the square of the potential difference

23
Q

Dimension of electromotive force (e.m.f.) is

A

M¹ L² T⁻³ I⁻¹

24
Q

Ampere - hour is unit of

A

Charge

25
Q

The power of electric circuit is

A

V²/R

26
Q

A current flows in a wire of resistance 5Ω having potential difference 7 volt for 20 minutes. The heat produced is

A

2800 cal

27
Q

In the following Question Nos. (1) to (4), there are two columns. Column 1 contains 4 questions. You have to match the correct options of these questions as A, B,C,D from column 2.

A

Ohm’s law — Potential difference/current = Constant

Kirchhoff’s law — Conservation of energy

Force × Velocity — Potential difference × current

Kilowatt-hour — Potential difference × current × Time

28
Q

A current of 10 ampere flows in a wire for 10 second. If potential difference across the wire is 15 Volt, the work done will be

A

1500J

29
Q

The electrical resistance of a healthy man is

A

50,000Ω

30
Q

Kilowatt-hour (kWh) is the unit of

A

Energy

31
Q

Statement 1 : The electrical lamp light up immediately after switch is on.

Statement 2 : The free electrons of fire move with speed of light.

A

Statement 1st is true, but Statement 2nd is false.

32
Q

Statement 1 : A large dry cell has higher e.m.f.

Statment 2 : The e.m.f of a dry cell is proportional to its size.

A

Statement 1st is false, but Statement 2nd is true.

33
Q

Which of the following is correct for current density?

A

J = I/A

34
Q

Which of the following is correct for mobility?

A

µ = Vd/E

35
Q

Which of the following is correct?

A

1 watt = 1 Js⁻¹

36
Q

Colour code of carbon resistance for blue colour is

A

6

37
Q

Wheatstone’s bridge is used in measuring

A

Both high and low resistance

38
Q

The algebraic sum of all currents meeting at any point in an electrical circuit is

A

Zero

Physics Objectives (16 decks)

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