An electric motor converts: MCQ with Answer and Explanation

An electric motor converts:
A. Magnetic energy into electrical energy
B. Mechanical energy into electrical energy
C. Chemical energy into mechanical energy
D. Electrical energy into mechanical energy
Answer: Option D
Solution (By JKSSB Mock Tests)
An electric motor is a device that utilizes the magnetic effect of electric current. When a current-carrying coil is placed in a magnetic field, it experiences a force (Fleming's Left-Hand Rule) that causes it to rotate. Therefore, it continuously converts electrical energy into mechanical energy. A generator does the reverse.

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Practice More Physics Questions

Question #1
Identify the logic gate that gives a HIGH (1) output only when both of its inputs are HIGH (1).
A. AND gate
B. OR gate
C. NOR gate
D. NAND gate

Correct Answer: Option A


Explanation:
Logic gates process digital signals. An AND gate acts like two switches in series. Current (a logic HIGH or 1) will only flow to the output if Switch A AND Switch B are closed (HIGH). The truth table for an AND gate shows output = 1 solely when Input A = 1 and Input B = 1. In all other combinations, the output is strictly 0.

This question belongs to: Science Physics
Question #2
The density of a substance is 8 g/cm³. In SI, it is
A. 80 kg/m³
B. 8000 kg/m³
C. 800 kg/m³
D. 8 kg/m³

Correct Answer: Option B


Explanation:
1 g/cm³ = 1000 kg/m³, so 8 g/cm³ = 8000 kg/m³.

This question belongs to: Science Physics
Question #3
The unit of specific heat capacity is
A. J/kg°C
B. J/°C
C. J/kg
D. J

Correct Answer: Option A


Explanation:
Q = m c ΔT => c = Q/(m ΔT), unit J/(kg °C).

This question belongs to: Science Physics