General Physics Questions And Answers


Q1. 
The efficiency of a transformer is the ratio of output power to input power.

Ans.
True


Q2. 
Which of the following is usually taken to make the core of a transformer?

Ans.
Soft iron


Q3. 
Current remains unchanged in a transformer.

Ans.
False


Q4. 
LED lights of chargers glow even after it is switched off. Which of the following causes this situation?

Ans.
LC Oscillations


Q5. 
Find the true statement.

Ans.
When a charged capacitor is connected to an inductor, the electric current in the circuit and charge on the capacitor undergoes LC oscillations


Q6. 
Find the true statement.

Ans.
Phasors for voltage and current are in the same direction when the phase angle between voltage and current is zero


Q7. 
Which value of the current do you measure with an a.c. ammeter?

Ans.
Root mean square value


Q8. 
Identify the principle behind the working of an a.c. generator.

Ans.
Electromagnetic induction


Q9. 
In an a.c. generator, electrical energy is converted to mechanical energy by electromagnetic induction.

Ans.
False


Q10. 
‘X’ is a rectangular coil consisting of a large number of turns of copper wire wound over a soft iron core in an a.c. generator. Identify X.

Ans.
Armature