# Communication System (NEET Physics): Questions 9 - 11 of 42

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## Question number: 9

» Communication System » Sky and Space Wave Propagation

MCQ▾

### Question

In a screw gauge, the zero of main scale coincides with fifth division of circular scale in figure (i). The circular divisions of screw gauge are 50. It moves 0.5 mm on main scale in one rotation. The diameter of the ball in figure (ii)

### Choices

Choice (4) Response

a.

1.25mm

b.

1.20mm

c.

1.25rnm

d.

2.20mm

## Question number: 10

» Communication System » Bandwidth of Signals

MCQ▾

### Question

In an experiment for measurement of young’s modulus, following readings are taken. Load = 3.00 kg, length = 2.820 m, diameter - 0.041 cm and extension = 0.87. Determine the percentage error in the measurement of Y.

### Choices

Choice (4) Response

a.

+ 15%

b.

+ 6.5%

c.

+ 5%

d.

+ 5.5%

## Question number: 11

» Communication System » Need for Modulation

MCQ▾

### Question

Students I, II and III perform an experiment for measuring the acceleration due to gravity (g) using a simple pendulum. They use different lengths of the pendulum and/or record time for different number of oscillations. The observations are shown in the table. Least count for length = 0.1 cm

 Student Length of the pendulum (cm) No. of oscillations (n) Total time for (n) oscillations (s) Time Period (s) I 64.0 8 128.0 16.0 II 64.0 4 64.0 16.0 III 20.0 4 36.0 9.0

If E I, E II and E III are the percentage errors in g, i. e. , ( for students, I, II and III, respectively, then

### Choices

Choice (4) Response

a.

E I = 0

b.

E I = E II

c.

E I is minimum

d.

E II is maximum

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