Practice Pakistan's most useful MCQs for competitive exams

Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is______________?

• (A)  12.5 Ω
• (B)  200 Ω
• (C)  20 KΩ
• (D)  50 Ω

Answer

Submitted By :Ali Uppal

In an LC oscillator, the frequency of oscillator is____________L or C?

• (A)  Proportional to square of
• (B)  Directly proportional to
• (C)  Independent of the values of
• (D)  Inversely proportional to square root of

Answer

Submitted By :Ali Uppal

When a 1.6 kΩ resistor and a 120Ω resistor are connected in parallel, the total resistance is____________?

• (A)  greater than 1.6 kΩ
• (B)  greater than 120 but less than 1.6 kΩ
• (C)  less than 120 but greater than 100 Ω
• (D)  less than 100 Ω

Answer

Submitted By :Ali Uppal

An ammeter has an internal resistance of 50 Ω. The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, RSH1, is approximately___________?

• (A)  55 Ω
• (B)  5.5 Ω
• (C)  50 Ω
• (D)  9 Ω

Answer

Submitted By :Ali Uppal

Four 8 Ω speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers_____________?

• (A)  18 W
• (B)  1.5 W
• (C)  48 W
• (D)  72 W

Answer

Submitted By :Ali Uppal

A sudden increase in the total current into a parallel circuit may indicate______________?

• (A)  a drop in source voltage
• (B)  an open resistor
• (C)  an increase in source voltage
• (D)  either a drop in source voltage or an open resistor

Answer

Submitted By :Ali Uppal

Six resistors are in parallel. The two lowest-value resistors are both 1.2 kΩ. The total resistance______________?

• (A)  is less than 6 kΩ
• (B)  is greater than 1.2 kΩ
• (C)  is less than 1.2 kΩ
• (D)  is less than 600 Ω

Answer

Submitted By :Ali Uppal

Six resistors are in parallel. The two lowest-value resistors are both 1.2 kΩ. The total resistance_____________?

• (A)  is less than 6 kΩ
• (B)  is greater than 1.2 kΩ
• (C)  is less than 1.2 kΩ
• (D)  is less than 600 Ω

Answer

Submitted By :Ali Uppal

The following resistors are in parallel across a voltage source: 220Ω , 470Ω , and 560Ω . The resistor with the least current is______________?

• (A)  220 Ω
• (B)  470 Ω
• (C)  560 Ω
• (D)  impossible to determine without knowing the voltage

Answer

Submitted By :Ali Uppal

For an oscillator to properly start, the gain around the feedback loop must initially be_________?

• (A)  1
• (B)  Greater than 1
• (C)  Less than 1
• (D)  Equal to attenuation of feedback circuit

Answer

Submitted By :Ali Uppal