# Physics (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 87 - 91 of 133

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 1042 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 450.00 or

## Question number: 87

» Physics » Motion and Force

MCQ▾

### Question

Bubbles of gas, escaping from the mud at the bottom of a deep lake, rise to the surface. As the bubbles rise, the bubble gets larger. Why is this?

### Choices

Choice (4) Response

a.

Water pressure on the bubbles increases

b.

Water pressure on the bubbles decreases

c.

Atmospheric pressure on the bubbles decreases

d.

Atmospheric pressure on the bubbles increases

## Question number: 88

» Physics » Motion and Force

MCQ▾

### Question

Consider the following statements the escape velocity depends on

1. Mass of the planet 2. Mass of the particles escaping

3. Temperature of the planet 4. Radius of the planet

Which of the above statement (s) is/are correct.

### Choices

Choice (4) Response

a.

I and II

b.

II and IV

c.

I and IV

d.

All of the above

## Question number: 89

» Physics » Magnetism & Electricity at Work

MCQ▾

### Question

The area enclosed by a hysteresis loop is a measure of

### Choices

Choice (4) Response

a.

permeability

b.

retentivity

c.

susceptibility

d.

energy loss per cycle

## Question number: 90

» Physics » Light

MCQ▾

### Question

A concave mirror of focal length (in air) is immersed in water Ki ). The focal length of the mirror in water will be

### Choices

Choice (4) Response

a.

b.

c.

d.

f

## Question number: 91

» Physics » Magnetism & Electricity at Work

MCQ▾

### Question

Magnetic lines of force due to a bar magnet do not intersect because

### Choices

Choice (4) Response

a.

the lines have similar charges and so repel each other

b.

a point always has a single net magnetic field

c.

the lines always diverge from a single point

d.

All of the above