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Physics Unit 7 Test

Total questions: 40

Worksheet time: 3600secs

Name
Class
Date
1.

At what temperature will resistance of copper wire becomes three times its value at 0°C ( α\alpha copper= 4×10–3/°C)

a)

550°C

b)

450°C

c)

400°C

d)

500°C

2.

If a bulb has a 20W power. If it is working at 60% efficiency, then its output power is

a)

12W

b)

15W

c)

20W

d)

18W

3.

Which of the following has a negative temperature coefficient?

a)

C

b)

Mn

c)

Fe

d)

Ag

4.

Pout will be maximum when

a)

R>r

b)

R=r

c)

R<r

d)

None of these

5.

The terminal voltage in the presence of the current would be

a)

Less than the emf by Ir

b)

Greater than emf by Ir

c)

Equal to emf by Ir

d)

Zero

6.

A battery whose emf is 40 V has an internal resistance of 5 Ω. If this battery is connected to a 15 Ω resistor R, what will be the voltage drop across R?

a)

10 V

b)

30 V

c)

15 V

d)

40 V

7.

An electric iron is marked 20 volts 500 W. The units consumed by it in using it for 24 hours will be            :

a)

12

b)

24

c)

5

d)

1100

8.

A circuit diagram is shown in which we have three resistances. Among three which develops maximum power?

a)

R1

b)

R2

c)

R3

d)

in series power remains same

9.

The V-I graph of a conductor at two different temperatures as shown in Fig. The relation between resistance will be

a)

R1 > R2

b)

R1 = R2

c)

R2 > R1

d)

R1 = 2 R2

10.

Length of two wires of same material have ratio 2:3 and their radii have the ratio 1:2 Then the ratio of their resistances is

a)

1 : 3

b)

4 : 3

c)

1 : 6

d)

8 : 3

11.

The temperature of a metal wire rises when an electric current passes through it because

a)

Collision of metal atoms with each other releases heat energy

b)

Collision of conduction electrons with the atoms of metal give them energy which appears as heat

c)

Collision of conduction electrons with each other releases heat energy

d)

all of these

12.

An electron is circulating in a circular path with a frequency of 50 Hz. What is the associated current?

a)

0.8 × 10–17 A

b)

8 × 10–17A

c)

0.4 × 10–17A

d)

80 × 10–17A

13.

A student kept his 60-watt, 120-volt study lamp turned on from 2:00 PM until 2:00 AM. How many coulombs of charge went through it?

a)

150

b)

3, 600

c)

7, 200

d)

21, 600

14.

Calculate current I in the adjoining circuit?

a)

0.1 amp

b)

0.4 amp

c)

0.2 amp

d)

0.3 amp

15.

Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10 Ohm when a potential difference of 20 V is applied between its ends

a)

4 C

b)

20 C

c)

240 C

d)

120 C

16.

A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly

a)

1020

b)

1016

c)

1018

d)

1023

17.

A 220 V, 1000 W Bulb is connected to a 110V supply. The power consumed by bulb will be

a)

750 W

b)

500 W

c)

250 W

d)

1000 W

18.

The temperature coefficient of resistance of a wire is 0.00125° C-1. At 300K its resistance is 1Ω. The temperature of the wire at which its resistance becomes 2Ω is:

a)

1400 K

b)

900 K

c)

600 K

d)

1100 K

19.

A 100 W electric bulb is lighted for 2 hrs daily and four 40-watt bulbs are lighted for 4 hrs every day. Calculate the energy consumed in kWh in 30 days.

a)

30 kWh

b)

28 kWh

c)

25.2 kWh

d)

32 kWh

20.

Electrical appliances are not connected in series because

a)

Series circuit is complicated

b)

Power loss is more

c)

Appliances have different current ratings

d)

Appliances have same current ratings

21.

The current in a component is reduced uniformly from 100mA to 20mA over a period of 8s. What is the charge that flow during this time

a)

160 mC

b)

320 mC

c)

480 mC

d)

640 mC

22.

The resistance of a wire is 20 ohms. It is so stretched that the length becomes three times, then the new resistance of the wire will be

a)

6.67 ohms

b)

60.0 ohms

c)

120 ohms

d)

180.0 ohms

23.

A neon flashlight cell with an emf of 1.5V gives a current of 15A when connected directly to an ammeter of resistance 0.04Ω. The internal resistance of the cell is

a)

0.0004Ω

b)

0.06Ω

c)

0.10Ω

d)

0.13Ω

24.

In an open circuit, the current flowing through the circuit is:

a)

Infinite

b)

Finite

c)

Zero

d)

Maximum

25.

Terminal potential difference of a cell:

a)

Increases with increase in its internal resistance

b)

Decrease with increase in internal resistance

c)

Is independent of it internal resistance

d)

None of these

26.

There are three bulbs of 60W 100W and 200W. Which bulb has thickest filament?

a)

100W

b)

200W

c)

60 W

d)

All

27.

During the verification of Ohm’s law:

a)

Ammeter and voltmeter should be connected in series

b)

Ammeter should be connected in series and voltmeter in parallel

c)

Ammeter should be connected in parallel and voltmeter in series

d)

Ammeter and voltmeter should be connected in parallel

28.

Three copper wires have following dimensions:

Wire A: L=50 cm, A = 2 cm2

Wire B: L = 150 cm, A = 1 cm2

Wire C: L = 75 cm, A = 3 cm2

Which wire has greater resistance?

a)

Wire A

b)

Wire B

c)

Wire C

d)

All have same resistance

29.

Which of the following material possesses greater conductivity?

a)

Silver

b)

Nickel

c)

Titanium

d)

Iron

30.

Conductivity ‘σ ’ in terms of conductance ‘G’ is expressed as:

a)

σ=GAℓ\sigma=\frac{GA}{ℓ}  

b)

σ=GℓA\sigma=\frac{Gℓ}{A}  

c)

σ=GRA\sigma=\frac{GR}{A}  

d)

σ=ℓGA\sigma=\frac{ℓ}{GA}  

31.

A source of current named “dynamo” converts:

a)

Heat energy to electrical energy

b)

Light energy to electrical energy

c)

Chemical energy to electrical energy

d)

Mechanical energy to electrical energy

32.

In the given circuit the current drawn through battery is:

a)

0.5 A

b)

1.0 A

c)

1.5 A

d)

2.0 A

33.

The effective resistance of n identical resistors connected in parallel is x. If the resistors are connected in series, the effective resistance will be:

a)

nx

b)

n2x

c)

xn\frac{x}{n}  

d)

xn2\frac{x}{n^2}  

34.

The effective resistance of two wires in parallel is 127\frac{12}{7} Ω . If the resistance of one wire is 3Ω, that of other wire

a)

2Ω

b)

3Ω

c)

4Ω

d)

53\frac{5}{3} Ω

35.

The effective resistance between A and B in the circuit is: A

a)

2.5 Ω

b)

3.0 Ω

c)

3.5 Ω

d)

4.0 Ω

36.

A wire of resistance 30 Ω is bent in the form of an equilateral triangle. The resistance between two vertices is:

a)

9.7 Ω

b)

11.9 Ω

c)

6.6 Ω

d)

12.4 Ω

37.

Ohm’s Law is valid when the temperature of the conductor is:

a)

Constant

b)

Very low

c)

Very high

d)

Changing

38.

If the temperature of a conductor is increased, the product of resistivity and conductivity:

a)

Increases

b)

Remains constant

c)

Decreases

d)

May increase or decrease

39.

Siemen is a unit of conductance, unit of conductivity is equal to:

a)

ohm

b)

mho

c)

mho . m

d)

mho . m-1

40.

Which of the following-statement is true?

a)

E=Vt if I=0E=V_t\ if\ I=0

b)

E=Vt+Ir if battery is charg⁡ingE=V_t+Ir\ if\ battery\ is\ ch\arg ing  

c)

E=Vt−Ir if battery is discharg⁡ingE=V_t-Ir\ if\ battery\ is\ disch\arg ing  

d)

E=Vt if r=0E=V_t\ if\ r=0  

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