Current Electricity Test

Result

Current Electricity Test - 83

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statement is false?

A
Wheatstone bridge is the most sensitive, when all the four resistance are of the same order of magnitude.

B
In a balanced wheatstone bridge if the cell and the galvanometer are exchanged, the null point is disturbed.

C
A rheostat can be used as a potential divider.

D
Kirchhoff's second law represents energy conservation

Solution
Question 2
1 / -0

In the circuit shown, when R has removed an additional resistance of $$72\ \Omega $$ must be introduced in series with the battery in order to keep the current through $$30\ \Omega $$ resistance unaltered. Hence R is

A
$$15\ \Omega $$

B
$$18\ \Omega $$

C
$$25.7\ \Omega $$

D
$$21\ \Omega $$
Question 3
1 / -0

A bar magnet is paced on the axis in a circular coil, close to the coil. Both of them are moved in the same direction. The coil covers $$1\ m$$ in $$0.5 s$$ and the magnet travels, $$2\ m$$ in $$1s$$ then the introduced emf produced in the coil is _______ V.

A
$$0.5$$

B
$$0$$

C
$$2$$

D
$$1$$

Solution
Question 4
1 / -0

In the given circuit of potentiometer length of the wire is 6 m then current through the galvanometer when jockey touches the wire at 5.6 m.

A
1.5 from negative terminal to jockey

B
1.5 A from jockey to negative terminal

C
3A from jockey to negative terminal

D
3A from negative terminal to jockey

Solution
Question 5
1 / -0

The magnitude and direction of current I (in A) indicated in the adjoining circuit is :

A
$$14 \rightarrow$$

B
$$8 \rightarrow$$

C
$$\leftarrow 4$$

D
$$\leftarrow 8$$

Solution

Correct option is (B)
Question 6
1 / -0

Calculate ratio of $${ i }_{ 1 }$$ and $$({ i }_{ 1 }+\quad { i }_{ 2 })$$.

A
$$\dfrac { 4 }{ 3 } $$

B
$$\dfrac { 4 }{ 9 } $$

C
$$\dfrac { 2 }{ 5 } $$

D
zero

Solution
Question 7
1 / -0

The emf of the battery shown in figure is

A
$$12$$ $$V$$

B
$$16$$ $$V$$

C
$$18$$ $$V$$

D
$$15$$ $$V$$

Solution
Question 8
1 / -0

In the given figure if $$i _ { 1 } = 3 \sin \omega t$$ and $$i _ { 2 } = 4 \cos \omega t$$ then $$i _ { 3 }$$

A
$$5 \sin \left( \omega t + 53 ^ { \circ } \right)$$

B
$$5 \sin \left( \omega t + 37 ^ { \circ } \right)$$

C
$$5 \sin \left( \omega t + 45 ^ { \circ } \right)$$

D
$$5 \cos \left( \omega t + 53 ^ { \circ } \right)$$

Solution
Question 9
1 / -0

A metre bridge cannot be used to determine

A
resistance of a wire.

B
specific resistance,

C
conductivity.

D
e.m.f of a cell.

Solution
Question 10
1 / -0

Two cells of e.m.f. $${ E }_{ 1 }$$ and $${ E }_{ 2}$$ are joined in series and the balancing length of the potentiometer wire is 625 cm. If the terminals of $${ E }_{ 1}$$ are reversed, the balancing length obtained is 125 cm. Given $${ E }_{ 2}>{ E }_{ 1}$$, the ratio $${ E }_{ 1}:{ E }_{ 2}$$ will be

A
2:3

B
5:1

C
3:2

D
1:5

Solution