The device that converts AC to DC is MCQ with Answer and Explanation

The device that converts AC to DC is
A. Oscillator
B. Transformer
C. Rectifier
D. Amplifier
Answer: Option C
Solution (By JKSSB Mock Tests)
Rectifier uses diodes to convert AC to pulsating DC. Filter capacitors smooth it. Used in power supplies. Inverter does DC to AC. Transformer changes AC voltage.

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Practice More Physics Questions

Question #1
Atom's nucleus contains:
A. Protons and neutrons
B. Only protons
C. Protons, neutrons, electrons
D. Electrons and protons

Correct Answer: Option A


Explanation:
Nucleus: protons (+) and neutrons (neutral); electrons orbit outside. Atomic number = proton count; mass number = protons + neutrons. Memory tip: 'Nucleus = nucleons (p+n); electrons in shells'. Basic atomic structure frequently tested in competitive modern physics sections.

This question belongs to: Science Physics
Question #2
A 10 μF capacitor is charged to 100 V. Energy stored is
A. 5 J
B. 0.05 J
C. 50 J
D. 0.5 J

Correct Answer: Option B


Explanation:
E = ½CV² = ½ × 10×10⁻⁶ × 10000 = 0.05 J.

This question belongs to: Science Physics
Question #3
Two masses, M1 = 3 kg and M2 = 2 kg, are connected by a light inextensible string passing over a frictionless pulley (Atwood machine). The acceleration of the system is (Take g = 10 m/s^2):
A. 10 m/s^2
B. 2 m/s^2
C. 5 m/s^2
D. 4 m/s^2

Correct Answer: Option B


Explanation:
For an Atwood machine, the common acceleration of both masses is given by the formula a = [(M1 - M2) / (M1 + M2)] * g. Substituting the given values: a = [(3 - 2) / (3 + 2)] * 10 = (1 / 5) * 10 = 2 m/s^2. The heavier mass accelerates downwards, the lighter one upwards.

This question belongs to: Science Physics