NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1009 - 1012 of 2142

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Question number: 1009

» Electromagnetic Induction & Alternating Currents » Resonance

MCQ▾

Question

The coefficient of induction of a choke coil is 0.1 H and resistance is 12Ω. If it is connected to an alternating current source of frequency 60 Hz, then power factor is approximately

Choices

Choice (4) Response

a.

0.1

b.

0.30

c.

0.2

d.

0.4

Question number: 1010

» Electromagnetic Induction & Alternating Currents » Power in AC Circuits

Assertion-Reason▾

Assertion (Ꭺ)

For an electric lamp connected in series with a variable capacitor and ac source, its brightness increases with increase in capacitance.

Reason (Ꭱ)

Capacitive reactance decreases with increase in capacitance of capacitor.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are false

Question number: 1011

» Ray Optics » Magnification

MCQ▾

Question

The relation between the linear magnification m, the object distance u and the focal length f for a spherical mirror is

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1012

» Ray Optics » Reflection and Refraction of Light » Spherical Surface

MCQ▾

Question

A plane mirror reflecting a ray of incident light is rotated through an angle θ about an axis through the point of incidence in the plane of the mirror perpendicular to the plane of incidence, then

(1) The reflected ray rotates through an angle 2θ

(2) The incident ray is fixed

(3) The reflected ray does not rotate

(4) The reflected ray rotates through an angle 0

Select the correct answers and mark it according to the following codes:

Codes:

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1 and 3 are correct

c.

1, 2 and 3 are correct

d.

1 and 2 are correct

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