NEET Physics: Questions 1852 - 1855 of 2098

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Passage

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

The electron density of a layer of ionosphere at a height 150 km from the earth’s surface is 9 ⨯ 10 9 per m 3. For the sky transmission from this layer up to a range of 250 km,

Question number: 1852 (2 of 3 Based on Passage) Show Passage

» Communication System » Sky and Space Wave Propagation

MCQ▾

Question

The critical frequency of the layer is

Choices

Choice (4) Response

a.

2.7 Hz

b.

2 Hz

c.

2.7 MHz

d.

2.78 kHz

Question number: 1853 (3 of 3 Based on Passage) Show Passage

» Communication System » Bandwidth of Signals

MCQ▾

Question

Maximum usable frequency is,

Choices

Choice (4) Response

a.

3.5 Hz

b.

3.5 ⨯ 10 6 HZ

c.

3.5 ⨯ 10 10 Hz

d.

3.5 ⨯ 10 3 Hz

Question number: 1854

» Experimental Skills » P-N Junction Diode

MCQ▾

Question

Four diodes shown in the following diagrams, which one is reverse biased?

Choices

Choice (4) Response

a.

Diagram of diode and resistance choice A

Diagram of Diode and Resistance Choice A

Figure shows the circuit diagram, in which pn-junction diode connected with resistance between two different potential.

b.

Diagram of diode and resistance choice B

Diagram of Diode and Resistance Choice B

Figure shows the circuit diagram, in which pn-junction diode connected with resistance between two different potential.

c.

Diagram of diode and resistance choice C

Diagram of Diode and Resistance Choice C

Figure shows the circuit diagram, in which pn-junction diode connected with resistance between two different potential.

d.

 Diagram of diode and resistance choice D

Diagram of Diode and Resistance Choice D

Figure shows the circuit diagram, in which pn-junction diode connected with resistance between two different potential.

Question number: 1855

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

A source of sound of frequency n is moving towards a stationary observer with a speed S. If the speed of sound in air is V and the frequency heard by the observer is n 1, the value of n1n is,

Choices

Choice (4) Response

a.

VV+S

b.

V+SV

c.

VVS

d.

VSV

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