# Physics [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 234 - 239 of 285

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## Passage

A train is moving between A and B. The distance – time graph of journey of train is shown as below.

## Question number: 234 (3 of 3 Based on Passage) Show Passage

Physics
Edit

### Question

MCQ▾

The distance travelled by the train in end of 15 min is:

### Choices

Choice (4)Response

a.

b.

c.

d.

Cannot determined

## Question number: 235

Edit

### Question

MCQ▾

Two objects are placed apart, then the gravitational force between them is . After some time they are placed apart, then the gravitational force between them is . Find the ratio of these gravitational forces .

### Choices

Choice (4)Response

a.

9

b.

c.

d.

3

## Question number: 236

Physics
Edit

### Question

MCQ▾

A speed of a sound is and its wavelength is . Then sound is:

### Choices

Choice (4)Response

a.

Ultrasonic

b.

Infrasonic

c.

Audible

d.

None of the above

## Question number: 237

Edit

### Question

MCQ▾

If two forces of and act on a body in opposite direction in a straight line as shown in figure, then the resultant force is:

### Choices

Choice (4)Response

a.

in the direction from to

b.

in the direction from to

c.

in the direction from to

d.

in the direction from to

## Question number: 238

Edit

### Question

MCQ▾

The SI unit of the universal constant of gravitation is:

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 239

Physics
Edit

### Question

MCQ▾

The speed of a sound wave in air is at temperature of air and speed of same sound wave in air is at temperature of air . If the temperature is more than temperature , then which of the following is correct?

### Choices

Choice (4)Response

a.

b.

c.

d.

All of the above