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

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2098 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 550.00 or

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)

 Screw Gauge – With 50 circular divisions

Screw Gauge – With 50 Circular Divisions

The zero main scale coincides with fifth division of circular scale.

Screw Gauge with Ball

Screw Gauge With Ball

Measuring diameter of the ball

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

Least count for time = 0.1 s

Table on length of pendulum and number of oscillations

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. , ( Δgg×100) 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

f Page
Sign In