Electric Current and its Effects Test

Result

Electric Current and its Effects Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

What is CFL ?

A
Compact Fluorescent Lamp

B
Compact Fluorescent Lamina

C
Complete Fluorescent Light

D
Controlled Fluorescent Light

Solution

CFL is Compact Fluorescent Lamp.

A compact fluorescent lamp, also called compact fluorescent light, energy-saving light, and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent light bulb; some types fit into light fixtures designed for incandescent bulbs.
Question 2
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 3
1 / -0

Choose the wrong option regarding miniature circuit breaker (MCB)?

A
MCB contains a metal that melts when the current passing through it exceeds a certain value and hence opens the circuit

B
Quick restoration of an MCB is possible just by switching on the operation when a breakdown occurs due to the current overload

C
MCB switches off the circuit automatically when the current passing through it exceeds a certain value

D
None of the above

Solution

In MCB, whenever continuous current flows, the bimetallic strips are heated and deflect by bending. This deflection of bimetallic strips releases the mechanical latch. It causes to open the miniature circuit breakers contact and the MCB turns of thereby stopping the current to flow in the circuit. Hence $$A$$ is the wrong statement.
Question 4
1 / -0

Shivam went for buying a CFL from D-mart, what safety mark he should look for?

A
Agmark

B
ISI mark

C
Trade mark

D
Brand logo

Solution

Shivam went for buying a CFL from D-mart,ISI safety mark he should look for
ISI mark is a certification mark for industrial products in India. The mark certifies that a product confirms to the Indian Standard(IS), mentioned as CM/L-xxxxxxx on top of the mark, developed by the Bureau of Indian Standards (BIS), the national standards body of India
Question 5
1 / -0

Which of the following circuits will the bulb glow?

A

B

C

D

Solution

In figure (A), both ends of the bulb are connected to the negative terminal of the cell. So, bulb will not glow while in figure (B) and (C), insulating objects like string and rubber band are used. So, the circuit is incomplete and bulb will not glow. Figure (D) represents the complete circuit with proper connection. Hence, the bulb glows in figure (D).
Question 6
1 / -0

An electric bell has a resistance of $$5 \Omega$$ and requires a current of $$0.25\ A$$ to work it. Assuming that the resistance of the bell wire is $$1 \Omega$$ per $$15m$$ and that the bell push is $$90m$$ distance from the bell. How many cells each of emf $$1.4V$$ and internal resistance $$2 \Omega$$, will be required to work the circuit.

A
$$3$$

B
$$4$$

C
$$5$$

D
$$Can't\ be\ determined$$

Solution

$$\textbf{Given}:$$ $$i=0.25A, E=1.4V$$

$$\textbf{Solution}:$$
Total resistance of the wire=$$5\Omega$$
Now, Resistance per unit length
$$\rho = \dfrac{1}{15}$$ $$\Omega/m$$
Also
$$R_W = \dfrac{1}{15}\times90$$ = $$6\Omega$$
And, let there be n cells
$$R_{eq} = [6+5+n(2)]$$

There are n cells, so

$$i= 0.25$$ $$=\frac{V_{eq}}{R_{eq}}=$$$$\dfrac{nE}{R_{eq}}$$

$$\dfrac{1}{4}=\dfrac{n\times 1.4}{11+2n}$$

$$\therefore n = 3.05\approx 3$$

$$\textbf{Hence C is the correct option}$$
Question 7
1 / -0

___________ is used to measure electric resistance in a circuit.

A
Voltmeter

B
Galvanometer

C
Ammeter

D
Ohm meter

Solution

$$\textbf{Step - Check all options}$$
Ohm meter is used to measure electric resistance in a circuit.
Galvanometer $$\rightarrow$$ used to measure small current in a circuit.
Voltmeter $$\rightarrow$$ used to measure voltage
Ammeter $$\rightarrow$$ used to measure current

Ans. option D.
Question 8
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 9
1 / -0

The purpose of armature in an electric bell is

A
to make and break the circuit

B
to produce sound

C
to produce magnetic field

D
to provide spring action

Solution

The purpose of armature in an electric bell is 1. to make and break the circuit 2. to produce sound.
Question 10
1 / -0

If the switch is connected to a bulb and the battery is kept in the on position what do you observe?

A
The bulb will glow

B
The bulb remains off

C
Cannot say

D
None of the above

Solution

When the switch is turned ON the circuit completes and the bulb starts to glow. When the switch is turned OFF the bulb does not glow. So circuit has two states on which the bulb depends. So we cannot determine by just connecting the switch in the circuit.