Electricity and Circuits Test

Result

Electricity and Circuits Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

The given diagram is a torch containing cells. The torch is not glowing when the switch is ON. Now, it is opened to know the reasons. Which of the following statements are correct regarding the reasons?
(i) Bulb of the torch is fused.
(ii) Cells are not connected properly.
(iii) The metal parts of the torch do not make proper contact with the cell.

A
Only (i) and (ii)

B
Only (ii) and (iii)

C
Only (i) and (iii)

D
All (i), (ii) and (iii)

Solution

The torch is not glowing because either its bulb is fused or cells are connected wrongly or metal spring of torch does not make proper contact with the cell.
Question 2
1 / -0

In the circuit shown in figure bulb will become suddenly bright if:

A
contact is made or broken

B
contact is made

C
contact is broken

D
Would not become bright

Solution

When a circuit is broken$$,$$ the induced $$e.m.f$$ is largest$$.$$
Hence,
option $$C$$ is correct answer.
When contact is broken, current in the circuit decreases. To oppose this inductor releases current and emf is induced. This induced emf is having high value hence bulb will become suddenly bright.
Question 3
1 / -0

Two cells of each I5 V and third cell of $$1\space V$$ arc connected in series. Find the battery voltage.

A
$$30\space V$$

B
$$15\space V$$

C
$$31\space V$$

D
None of these

Solution
Question 4
1 / -0

Choose from the options a, b, c and d given in the figure which shows the correct direction of current.

A

B

C

D

Solution

The correct answer is option (b). The direction of current is considered from the positive terminal to the negative terminal of the electric cell in an electric circuit outside the cell.
Question 5
1 / -0

Paheli is running short of connecting wires. To complete an electric circuit. she may use a

A
Glass bangle.

B
Thick thread.

C
Rubber pipe.

D
Steel spoon.

Solution

The correct answer is option (d) Steel spoon. Steel is a good conductor of electricity.
Question 6
1 / -0

When a switch is in OFF position,
i) Circuit starting from the positive terminal of the cell stops at the switch.
ii) Circuit is open.
iii) No current flows through it.
iv) Current flows after some time.
Choose the combination of correct answer from the following.

A
all are correct

B
(ii) and (iii) are correct

C
only (iv) is correct

D
only (i) and (ii) are correct

Solution

When the switch of a circuit is in off position, the circuit will remain open and in this condition, the current does not flow through the circuit.

So, option (II) and (III) are correct.
Question 7
1 / -0

Three bulbs A, B, C are connected in a circuit as shown in Figure 14.2. When the switch is ON

A
Bulb C will glow first.

B
Bulb B and C will glow simultaneously and bulb A will glow after some time.

C
All the bulbs A, B, and C will glow at the same time.

D
The bulbs will glow in the order A, B and C.

Solution

All the three bulbs are connected in series to the battery so as soon as the bulb is switched on, all the three bulbs will glow at the same time.
Question 8
1 / -0

Which is not a component of electric cell ?

A
strip of iron

B
coil

C
contact nut

D
magnetic needle

Solution
Question 9
1 / -0

Electric cell (Battery) as shown in the figure points 'B' indicate

A
Filament

B
Holder

C
Positive terminal

D
Negative terminal

Solution

Point B indicates the Negative Terminal of the battery.
The negative Terminal generates the electrons, which is doing the actual movement in a circuit and produces current.
Question 10
1 / -0

For the electric cell (Battery) shown in the figure. Point 'A' indicate

A
Filament

B
Holder

C
Positive terminal

D
Negative terminal

Solution

An electric cell has two terminals, one positive and one negative.
The point A indicates the positive terminal of the battery.
The point B indicates the negative terminal of the battery.