# NEET Physics: Questions 1877 - 1881 of 2142

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## Question number: 1877

MCQ▾

### Question

The semi-major axes of the orbits of mercury and mars are respectively 0.387 and 1.524 in astronomical unit. If the period of Mercury is 0.222 year, what is the period of Mars?

### Choices

Choice (4) Response

a.

1.73 years

b.

1.23 years

c.

3.24 years

d.

1.95 years

## Question number: 1878

MCQ▾

### Question

The speed of sound in air at a given temperature is 250 m/s. An engine blows whistle at a frequency of 810 cps. It is approaching the observer with velocity 25 m/s. The apparent frequency in cps heard by the observer will be

### Choices

Choice (4) Response

a.

1100

b.

800

c.

900

d.

1000

## Question number: 1879

MCQ▾

### Question

A satellite is revolving in an orbit close to the earth’s surface. Taking the radius of the earth as 5.8 ⨯ 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.

7.5 km/sec, 8.0 minutes

b.

2.7 km/sec, 8.51 minutes

c.

7.75 km/sec, 80.51 minutes

d.

7.5 km/sec, 80.51 minutes

## Question number: 1880

MCQ▾

### Question

A current of 5.5 A produces a deflection of 45° in the galvanometer. The figure of merit is

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1881

MCQ▾

### Question

A satellite has to revolve round the earth in a circular orbit of radius 6 ⨯ 10 3 km. The velocity of projection of the satellite in this orbit will be -

### Choices

Choice (4) Response

a.

b.

c.

d.

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