NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1870 - 1873 of 2184

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Question number: 1870

» Experimental Skills » Focal Length

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MCQ▾

Question

In an experiment to determine the focal length (f) of a concave mirror by the u - v method, a student places the object pin O on the principal axis at a distance x from the pole P. The student looks at the pin and its inverted image at I on principal axis from a distance keeping his/her eye in line with PO. When the student shifts his/her eye towards left, the image appears to the right of the object pin. Then,

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1871

» Gravitation » Orbital Velocity of a Satellite

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MCQ▾

Question

A satellite is revolving in an orbit close to the earth’s surface. Taking the radius of the earth as 6.4 ⨯ 10 6 meter, the value of the orbital speed and the period of revolution of the satellite will respectively be (g = 9.8 meter/sec 2)

Choices

Choice (4) Response

a.

2.7 km/sec, 8.6 minutes

b.

0.72 km/sec, 84.6 minutes

c.

7.2 km/sec, 8.6 minutes

d.

7.2 km/sec, 84.6 minutes

Question number: 1872

» Communication System » Amplitude and Frequency Modulation

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MCQ▾

Question

In an amplitude modulated wave for audio frequency of 500 cycle/second, the appropriate carrier frequency will be,

Choices

Choice (4) Response

a.

500 cycles/sec

b.

50 cycles/sec

c.

100 cycles/sec

d.

50,000 cycles/sec

Question number: 1873

» Oscillations and Waves » Beats

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Assertion-Reason▾

Question

Assertion (Ꭺ)

Beats cannot be produced by light sources.

Reason (Ꭱ)

Light sources have constant phase difference.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false