NEET Physics: Questions 737 - 740 of 2099

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2099 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 550.00 or

Question number: 737

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

In an L - R circuit, the value of L is (0.4π) henry and the value of R is 30 ohm. If in the circuit, an alternating e. m. f. of 200 volt at 50 cycles per sec is connected, the impedance of the circuit and current will be

Choices

Choice (4) Response
a.

40.4 Ω, 5A

b.

30.7 Ω, 6.5A

c.

11.4Ω, 17.5A

d.

50 Ω, 4A

Question number: 738

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

In the circuit, E = 10 volt, R1 = 5.0 ohm, R 2 = 10 ohm and L = 5.0 henry. The current just after the switch S is pressed is.

 A diagram consists of resistors, inductor, switch and battery

a Diagram Consists of Resistors, Inductor, Switch and Battery

In figure, inductor L, and resistors R1 and R2 are connected with battery E and switch S.

Choices

Choice (4) Response
a.

3.0A

b.

5.0A

c.

2.0A

d.

6.0A

Question number: 739

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

An alternating current of frequency is flowing in a circuit containing a resistor of resistance R and a choke of inductance L in series. The impedance of this circuit is

Choices

Choice (4) Response
a.

R+2πfL

b.

R2+4π2f2L2

c.

R2+2πfL

d.

R2+L2

Question number: 740

» Electromagnetic Induction & Alternating Currents » Alternating Currents

Assertion-Reason▾

Assertion (Ꭺ)

The alternating current lags behind the emf by a phase angle of π2 , when ac flows through an inductor.

Reason (Ꭱ)

The inductive reactance increases as the frequency of ac source decreases.

Choices

Choice (4) Response
a. Both Ꭺ and Ꭱ are false
b. Ꭺ is true but Ꭱ is false
c. Ꭺ is false but Ꭱ is true
d. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Sign In