Physics - Mock Test 31

Question 301

A pure variable resistor is connected in series with a pure capacitor of fixed capacitance. The impedance of the circuit?

A) Remains B) Becomes infinite C) Becomes zero D) Increases

---

No Details

Question 302

If a glass plate is inserted in between the plate of a capacitor in series with a lighted bulb the brightness of the bulb?

A) Remains same B) Brightness increases C) Brightness decreases D) No light

---

No Details

Question 303

A 100?

A) 32? B) 62? C) 50? D) 100?

---

No Details

Question 304

In capacitive circuit the current?

A) Lags behind voltage by ?/2 B) Is in phase with voltage C) Opposite in phase of voltage by ? D) Leads forward the voltage by ?/2

---

No Details

Question 305

pure resistor circuit the voltage and current are 1⃣ Lagging each other 2⃣ They are at 90?

A) Lagging each other B) They are at 90? phase difference C) They have zero phase difference D) No phase difference

---

No Details

Question 306

An alternating current of r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing 10?

A) 20A B) 20.66A C) 6.66A D) 5.66A

---

No Details

Question 307

To find the r.m.s value of an alternating current mathematically we need to have?

A) Mean value of I2 B) Square root of mean value of I2 C) Square root of I2 D) Square of 1/2

---

No Details

Question 308

The value of the steady current which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current is?

A) Average current B) Sinusoidal current C) r.m.s current D) Net current

---

No Details

Question 309

A capacitor of 30μF charged to 100V is connected in parallel to capacitor of 20μF charged to 50V. The common potential is?

A) 75V B) 150V C) 50V D) 80V

---

No Details

Question 310

Electromagnetic waves emitted from antenna are?

A) Stationary B) Longitudinal C) Transverse D) All the above

---

No Details