PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 3 - Matter : Structure and Properties>EXERCISE>Q 4.1.

MEDIUM

9th West Bengal Board

IMPORTANT

Earn 100

Derive an expression for the pressure inside a liquid.

Important Questions on Matter : Structure and Properties

MEDIUM

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 3 - Matter : Structure and Properties>EXERCISE>Q 4.2.

State Archimedes' principle. Name the factors on which the buoyant force depends on.

MEDIUM

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 3 - Matter : Structure and Properties>EXERCISE>Q 4.3.

Name and explain the factors which affect the surface tension of a liquid?

MEDIUM

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 3 - Matter : Structure and Properties>EXERCISE>Q 4.4.

What is terminal velocity? Using its idea, explain the safe jumping from an aeroplane using parachute.

HARD

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 3 - Matter : Structure and Properties>EXERCISE>Q 4.5.

The base area of a bottle is

10 {cm}^{2}

. Water is filled in it up to a height of

20 cm

. If its density be

1000 {kgm}^{- 3}

. Calculate the pressure and thrust exerted by water at the bottom of the bottle. Assume that

g = 9.8 {ms}^{- 2}

.

MEDIUM

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 3 - Matter : Structure and Properties>EXERCISE>Q 4.6.

A wire of length $8 m$ has a cross-sectional area of $1 {mm}^{2}$ . A load of $10 kg$ Weight is applied to it. If the strain be $1 %$ of $0.1$ , then the calculated ratio of stress and strain is $X \times 10^{11} N m^{- 2}$ . The value of X is,