SSC CGL Science – Electricity & Magnetism – Tier II Level · Marathon

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SSC CGL Science – Electricity & Magnetism – Tier II Level · Marathon – 11 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.  
A transformer steps 220 V down to 11 V. If the primary has 2000 turns, the secondary has:

Correct Answer: D [100 turns]

Explanation:

Answer: 100 turns. Nₛ = 2000 × 11/220.

2.  
A cell of emf 2 V and internal resistance 1 Ω is connected to a 3 Ω resistor. The terminal voltage is:

Correct Answer: B [1.5 V]

Explanation:

Answer: 1.5 V. I = 2/4 = 0.5 A; V = 0.5 × 3.

3.  
Two point charges repel with a force F. If the distance between them is halved, the force becomes:

Correct Answer: C [4F]

Explanation:

Answer: 4F. F ∝ 1/r².

4.  
The peak value of a 230 V (rms) AC supply is about:

Correct Answer: A [325 V]

Explanation:

Answer: 325 V. 230 × √2 ≈ 325 V.

5.  
A wire 2 m long carries 5 A at right angles to a magnetic field of 0.1 T. The force on it is:

Correct Answer: D [1 N]

Explanation:

Answer: 1 N. F = BIL = 0.1 × 5 × 2.

6.  
Power lost in transmission lines is reduced by transmitting at high voltage because:

Correct Answer: B [the current, and so I²R loss, becomes smaller]

Explanation:

P = VI fixed → higher V, lower I.

7.  
Four cells, each of emf 1.5 V and internal resistance 0.5 Ω, are joined in series to a 4 Ω resistor. The current is:

Correct Answer: D [1 A]

Explanation:

E = 6 V, r = 2 Ω → I = 6/(4 + 2).

8.  
According to Lenz's law, the direction of an induced current is such that it:

Correct Answer: C [opposes the change that produces it]

Explanation:

Consequence of energy conservation.

9.  
How many electrons make up a charge of 3.2 × 10⁻¹⁹ C?

Correct Answer: A [2]

Explanation:

n = q/e = 3.2/1.6 = 2 (charge is quantised).

10.  
Assertion–ReasonAssertion (A): An ammeter has a very low resistance.
Reason (R): It is connected in series and must not change the current it measures.

Correct Answer: B [Both A and R are true and R explains A]

Explanation:

Low resistance → negligible change in the circuit current.

11.  
Data tableV (volt): 1, 2, 4, 8; I (ampere): 0.25, 0.5, 1, 2. The resistance of the conductor is:

Correct Answer: D [4 Ω]

Explanation:

V/I = 4 Ω in every row – an ohmic conductor.

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

📘 SSC CGL 2026 – General Science (Tier I + Tier II)
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