NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 768 - 772 of 2184

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Passage

Read the passage given below and answer the questions that follow:

If the voltage in an a c circuit is represented by the eq. , , then

Question number: 768 (3 of 3 Based on Passage) Show Passage

» Electromagnetic Induction & Alternating Currents » Alternating Currents

Edit
MCQ▾

Question

Frequency of ac is

Choices

Choice (4) Response

a.

75 Hz

b.

c.

d.

50 Hz

Question number: 769

» Laws of Motion » Force and Inertia

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MCQ▾

Question

A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, the force exerted by the rope on the block will be

Choices

Choice (4) Response

a.

P

b.

c.

d.

Question number: 770

» Magnetic Effects of Current and Magnetism » Biot - Savart Law

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MCQ▾

Question

A current i is flowing in a conductor PQRST shaped as shown in the figure. The radius of curved part QRS is r and length of straight portions PQ and ST is very large. The magnetic field at the center O of the curved part is –

current flowing conductor PQRST

Current Flowing Conductor PQRST

A current i is flowing in a conductor PQRST shaped as shown in the figure. The radius of curved part QRS is r and length of straight portions PQ and ST is very large.

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 771

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

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MCQ▾

Question

One 10 V, 60 W bulb is to be connected to 100 V line. The required induction coil has self-inductance of value (f = 50Hz)

Choices

Choice (4) Response

a.

16.2 mH

b.

1.62 mH

c.

2.42 H

d.

0.052 H

Question number: 772

» Electromagnetic Induction & Alternating Currents » Power in AC Circuits

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Assertion-Reason▾

Question

Assertion (Ꭺ)

A capacitor of suitable capacitance can be used in an ac circuit in place of the choke coil.

Reason (Ꭱ)

A capacitor blocks dc and allows ac only.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are false