NEET Physics: Questions 1712 - 1716 of 2098

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Question number: 1712

» Electronic Devices » Logic Gates (Or, and, NOT, NAND and NOR)

MCQ▾

Question

The truth-table given below is for which ate?

Truth table with output C and inputs A and B

Here table describe the inputs (A & B) and output (C) truth table for logic gate.

A

B

C

0

0

1

0

1

1

1

0

1

1

1

0

Choices

Choice (4) Response

a.

AND

b.

NAND

c.

OR.

d.

XOR

Question number: 1713

» Electronic Devices » Logic Gates (Or, and, NOT, NAND and NOR)

MCQ▾

Question

Correct statement for ‘NOR’ gate is that, it gives

Choices

Choice (4) Response

a.

Low output when both the inputs are low

b.

High output when both the inputs are low

c.

High output when both the inputs are high

d.

All of the above

Question number: 1714

» Oscillations and Waves » Periodic Functions

MCQ▾

Question

The time period of a simple pendulum of length L as measured in an elevator descending with acceleration g3 is

Choices

Choice (4) Response

a.

π3Lg

b.

2π3L2g

c.

2π2L3g

d.

2π3Lg

Passage

Sound from a point isotropic source spreads equally in all directions in homogeneous medium. Therefore its intensity decreases with square of distance from the source. When distance between observer and the source changes, apart from changes in intensity, the observer listens sound of pitch higher or lower than actual pitch depending upon the fact that the distance between the observer and source is decreasing or increasing respectively. An observer O is at a distance 2R from center of a circle of radius R. A point isotropic sound source S moves on the circle with uniform angular velocity ω=π3rads . Initially observer, source and Centre of the circle are in same line.

Isotropic sphere of radius R.

Isotropic Sphere of Radius R.

In above fig we shows that Sound from a point isotropic source spreads equally in all directions in homogeneous medium

Question number: 1715 (1 of 3 Based on Passage) Show Passage

» Oscillations and Waves » Wave Motion

MCQ▾

Question

During a complete round trip of star on the circle, the observer listens a sound, whose -

Choices

Choice (4) Response

a.

Wavelength first increases to a maximum value then decreases to the original value

b.

Wavelength first decreases to maximum value then increases to the original value

c.

During the first half time wavelength increases then decreases to the original value

d.

Question does not provide sufficient data or is vague

Question number: 1716 (2 of 3 Based on Passage) Show Passage

» Oscillations and Waves » Wave Motion

MCQ▾

Question

Starting from initial moment, the source moves through an angular displacement 180°. Intensity of the sound as observed by the observer decreases by a factor of –

Choices

Choice (4) Response

a.

9

b.

4

c.

2

d.

3

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