NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1078 - 1080 of 2184

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Question number: 1078

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

Edit
Assertion-Reason▾

Question

Assertion (Ꭺ)

Choke coil is preferred over a resistor to adjust current in an ac circuit.

Reason (Ꭱ)

Power factor for inductance is zero.

Choices

Choice (4) Response

a.

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

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

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

Question number: 1079

» Ray Optics » Snell's Law

Edit
MCQ▾

Question

A ray of monochromatic light is incident on the plane surface of separation between two media x and y with angle of incidence i in the medium x and angle of refraction r in the medium y. The graph shows the relation between sin i and sin r.

Graph of sin r→sin i

Graph of Sin R→Sin I

In figure the graph shows the relation between sin i and sin r.

(1) The speed of light in the medium y is times than in medium x

(2) The speed of light in the medium y is times than in medium x.

(3) The total internal reflection can take place when the incidence is in x.

(4) The total internal reflection can take place when the incidence is in y

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

Question number: 1080

» Ray Optics » Magnification

Edit
MCQ▾

Question

A 0.2 cm high object is placed 15 cm from a concave mirror of focal length 5 cm. Find position and size of the image.

Choices

Choice (4) Response

a.

7.5 cm, 0.4 cm.

b.

10.0 cm, 0.5 cm.

c.

7.5 cm, 0.4. cm.

d.

7.5 cm, 0.1 cm.