Current Electricity Test

Result

Current Electricity Test - 29

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Weekly Quiz Competition

Question 1
4 / -1

Three moving coil galvanometers A ,B and C are made of coils of three different material having torsional constant 1,8 × 10^-8 , 2.8 × 10^-8 and 3.8 × 10^-8 , respectively. If the three galvanometers are identical in all other respect, then in which of the above cases sensitivity is maximum ?

A
A

B
C

C
B

D
Same in each case

Solution
Question 2
4 / -1

In a meter bridge a 30Ω resistance is connected in the left gap and a pair of resistances P and Q in the right gap. Measured from the left, the balance point is 37.5 cm, when P and Q are in series and 71.4 cm when they are parallel. The values of P and Q (in ohm) are

A
40, 10

B
35, 15

C
30, 20

D
25, 25

Solution
Question 3
4 / -1

If resistance of voltmeter is 10000 Ω and resistance of galvanometer is 2 Ω, then find R when voltmeter reads 12V and galvanometer reads 0.1 A .

A
118Ω

B
120Ω

C
124Ω

D
114Ω

Solution
Question 4
4 / -1

Electrons are emitted by a hot filament and are accelerated by an electric field E as shown in fig. The two stops at the left ensure that the electron beam has a uniform cross-section.

A
The speed of electron is more at B than at A.

B
The electric current is from left to right.

C
The current density is more at B than at A.

D
The magnitude of the current is larger at B than at A.
Question 5
4 / -1

A metallic block has no potential difference applied across it, then the mean velocity of free electrons at absolute temperature T is

A
proportional to T

B
proportional to √T

C
zero

D
finite but independent of T.
Question 6
4 / -1

A potential difference of V is applied at the ends of a copper wire of length l and diameter d. On doubling only d, the drift velocity.

A
becomes two times

B
becomes half

C
does not change

D
becomes one-fourth

Solution
Question 7
4 / -1

A current through a wire depends on time as I = 10 + 4t. The charge crossing through the section of the wire in 10 seconds is

A
50 C

B
300 C

C
400 C

D
4 C

Solution
Question 8
4 / -1

There are two concentric spheres of radius a and b respectively. If the space between them is filled with medium of resistivity ρ, then the resistance of the intergap between the two spheres will be

A

B

C

D

Solution
Question 9
4 / -1

A given corbon resistor has the following colour code of the various strips : Orange, red, yellow and gold. The value of resistance in ohm is

A

B

C

D
Question 10
4 / -1

Variation of current (I) and voltage (V) in a conductor has been shown in Fig. The resistance of the conductor is

A
1 Ω

B
2 Ω

C
3 Ω

D
4 Ω

Solution