# NSO Level 1- Science Olympiad (SOF) Class 9: Questions 967 - 971 of 1123

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## Question number: 967

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MCQ▾

### Question

If the driver accelerates a moving bus, the passengers move backwards. This is due to

### Choices

Choice (4) Response

a.

Inertia

b.

Frictional force

c.

Gravitation

d.

All of the above

## Question number: 968

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MCQ▾

### Question

A toy car of mass is moving with a velocity of along a smooth floor and comes to rest after covering a distance of 20m. The force of friction between the car and the floor will be

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 969

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MCQ▾

### Question

Two objects of masses and are moving along the same line in opposite direction with velocities and respectively. They collide each other and after collision, the velocity of the first object reduced to . The velocity of the second object would be

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 970

Edit
MCQ▾

### Question

Which of these statements are correct about sound?

### Choices

Choice (4) Response

a.

Sound needs a medium to travel

b.

Sound cannot travel in vaccum

c.

Sound travels faster than light

d.

Sound waves is longitudinal waves

## Question number: 971

Edit
MCQ▾

### Question

According to Newton’s first law of motion, an object continues motion unless it is compelled by an external force to stop it. But a ball moving on the ground stops itself after a certain time. The external force behind it is

### Choices

Choice (4) Response

a.

Gravitational force

b.

Frictional force

c.

None of the above

d.

All of the above

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