(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

Name the physical quantities which are measured in the given units:

nm

Tick the most appropriate answer.

The surest test of magnetism is

The mass of an oxygen atom is 16.0 u. Express it in kg.

It takes time 8 min for light to reach from the sun to the earth surface . If speed of light is taken to be `3 xx 10^8   "m/s"^-1` , find the distance from the sun to the earth in km .

‘The distance of a star from the earth is 8.33 light minutes.’ What do you mean by this statement? Express the distance in metre.

Explain the meaning of the term 'least count of an instrument' by taking a suitable example.

A boy makes a ruler with graduations in cm on it, (i.e. 100 divisions in 1 m). To what accuracy  this  ruler can measure? How can this accuracy be increased?

What is backlash error? Why is it caused? How is it avoided?

A boy measures the length of a pencil and expresses it to be 2.6 cm. what is the accuracy of his measurement? Can he write it as 2.60 cm?

Differentiate between the scalar and vector quantities, giving two examples of each.

State whether the following quantity is a scalar or vector.

1. Pressure
2. Force
3. Momentum
4. Energy
5. Weight
6. Speed

When is a body said to be at rest?

Distinguish between average speed and average velocity.

'The value of g remains the same at all places on the Earth's surface'. Is this statement true? Give reason for your answer.

The vector quantity is :

18 km h^-1 is equal to _____________

The correct equation of motion is : ___________

Define the term thrust. State its S.I. unit.

What is meant by pressure? State its S.I. unit.

What physical quantity is measured in bar?