padikam.in - AI-Powered Learning for Kerala Syllabus

Q1.

What is the SI unit of heat energy produced in an electrical conductor?

(A)

Watt (W)

(B)

Joule (J)

(C)

Ampere (A)

(D)

Volt (V)

Calculation / Rough Work Space

Q2.

According to Joule's Law, which equation represents heat energy $H$ produced by current $I$ through resistance $R$ in time $t$ ?

(A)

$H = V \times I$

(B)

$H = I^2 R t$

(C)

$H = \frac{V}{R} t$

(D)

$H = P t^2$

Calculation / Rough Work Space

Q3.

If the electric current flowing through a fixed resistor is doubled, how does the heat energy generated change?

(A)

Increases by 2 times

(B)

Increases by 4 times

(C)

Decreases to half

(D)

Remains unchanged

Calculation / Rough Work Space

Q4.

Which of the following is the correct formula for electric power $P$ in terms of voltage $V$ and resistance $R$ ?

(A)

$P = V \times R$

(B)

$P = \frac{V^2}{R}$

(C)

$P = I^2 V$

(D)

$P = V R t$

Calculation / Rough Work Space

Q5.

Why is a safety fuse wire constructed using a tin-lead alloy?

(A)

High melting point & zero resistance

(B)

Low melting point & appropriate resistance

(C)

High boiling point & high conductivity

(D)

Low ductility

Calculation / Rough Work Space

Q6.

What is the commercial unit of electrical energy consumed in households?

(A)

Watt-second

(B)

Kilowatt-hour (kWh)

(C)

Volt-Ampere

(D)

Ohm-metre

Calculation / Rough Work Space

Q7.

An electrical appliance rated $230\text{ V}$ consumes $920\text{ W}$ power. What is the current drawn by the appliance?

(A)

$2\text{ A}$

(B)

$4\text{ A}$

(C)

$6\text{ A}$

(D)

$10\text{ A}$

Calculation / Rough Work Space

Q8.

How are high-power electrical appliances connected in domestic distribution wiring?

(A)

Series connection

(B)

Parallel connection

(C)

Single line loop

(D)

Open circuit

Calculation / Rough Work Space

Q9.

What is the primary function of earthing in household electrical wiring?

(A)

Increase electrical voltage

(B)

Prevent electric shock during insulation leakage

(C)

Reduce electricity bill

(D)

Boost current frequency

Calculation / Rough Work Space

Q10.

An electric heater of $100\ \Omega$ resistance operates on a $200\text{ V}$ line for $10\text{ s}$ . Calculate heat $H$ generated.

(A)

$2,000\text{ J}$

(B)

$4,000\text{ J}$

(C)

$20,000\text{ J}$

(D)

$40,000\text{ J}$

Calculation / Rough Work Space

Effects of Electric Current — Joule's Law & Power