SSC CGL Science – Electricity & Magnetism – Level 1 · Warm-up · Tier I Level

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SSC CGL Science – Electricity & Magnetism – Level 1 · Warm-up · Tier I Level – 12 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
One-line factThe SI unit of electric current is:

Correct Answer: D [ampere]

Explanation:

The ampere is one of the seven SI base units.

2.  
An ammeter is always connected:

Correct Answer: C [in series]

Explanation:

It must carry the whole current.

3.  
The commercial unit of electrical energy is:

Correct Answer: B [kilowatt-hour]

Explanation:

Answer: kilowatt-hour. 1 kWh = 3.6 × 10⁶ J.

4.  
Fill in the blankThe filament of an electric bulb is made of ____.

Correct Answer: A [tungsten]

Explanation:

Very high melting point (about 3422 °C).

5.  
A fuse wire should have:

Correct Answer: B [a low melting point]

Explanation:

It must melt quickly when the current becomes too large.

6.  
Electric motors convert:

Correct Answer: C [electrical energy into mechanical energy]

Explanation:

Answer: electrical energy into mechanical energy. A generator does the reverse.

7.  
Electromagnetic induction was discovered by:

Correct Answer: D [Michael Faraday]

Explanation:

Answer: Michael Faraday. 1831.

8.  
Odd one outOdd one out (by the effect of current used):

Correct Answer: A [electric fan]

Explanation:

The fan uses the magnetic effect (motor); the others use the heating effect.

9.  
Statement-basedConsider the statements:
I. Household appliances are connected in parallel.
II. The fuse is connected in the neutral wire.
Which is/are correct?

Correct Answer: B [Only I]

Explanation:

The fuse goes in the live wire.

10.  
The frequency of the AC mains supply in India is:

Correct Answer: A [50 Hz]

Explanation:

Answer: 50 Hz. Nominal 50 Hz.

11.  
Like magnetic poles:

Correct Answer: C [repel each other]

Explanation:

Like poles repel, unlike poles attract.

12.  
The device used to change AC voltage from low to high is the:

Correct Answer: D [transformer]

Explanation:

A step-up transformer raises the voltage.

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science

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