Natural Resources

Q.

Explain why sound cannot travel through vacuum.

Q.

An inflated balloon is heavier than a deflated balloon?

Q.

The volume of $50g$ of a substance is $20c{m}^3$. If the density of water is $1gc{m}^{-3}$, will the substance float or sink?

Q.

Water is an important natural resource because:

1. it maintains ecological balance.
2. it sustains life.
3. it is necessary for respiration in aquatic organisms.
4. it is essential for photosynthesis.

Q. Which of the following is an example of inexhaustible resources?

1. Coal
2. Petrol
3. Diesel
4. Wind

Q.

Water does not run out of a dropper unless its rubber bulb is pressed. Explain.

Q.

An astronaut cannot use a straw to sip a drink on the surface of the moon

1. True
2. False

Q.

The solid part of the earth consisting of the crust and outer mantle is considered as Lithosphere.

True

False

Q.

Law of conservation of energy states that elements can neither be created nor destroyed.

1. False

2. True

Q.

The combined mass of water found on, under and above the surface of the Earth is called as 'hydrosphere'. It includes:

1. Ocean water

2. Glaciers

3. Rivers

4. Ponds

Q.

Explain solute, solvent, and solution, taking salt and water as examples.

Q.

Density, mass of metals of equal volumes of iron and aluminium have __________________masses.

Q.

Air does not have mass.

1. True
2. False

Q.

From where do the following usually get water? In which form is water present in them?

1. Clouds
2. Plants
3. Mountain tops
4. Aquifer
5. Animals

Q.

$1{\mathrm{cm}}^3$ block of wood weighs lesser than $1{\mathrm{cm}}^3$ block of iron. Explain.

Q. How would you obtain clear water from a sample of muddy water? [4 marks]

Q.

Differentiate between

Solute and solvent.

Q.

The density of water is $1gc{m}^{-3}$

1. True
2. False

Q.

Sound can travel in a vacuum.

1. True
2. False

Q.

A living organism can be produced from non-living entities.

1. True

2. False

Q.

Some natural resources are given in a box. Classify them into the exhaustible and inexhaustible natural resources. air, coal, natural gas, sunlight, petroleum, minerals, forests, oxygen.

Q. There is a fluid flowing in a pipeline. A situation arrives where we are required to reduce the pressure in the pipe to prevent it from bursting. Which among the following is the best solution?

1. Decrease the velocity of flow
2. Increase the temperature of the fluid
3. Decrease the temperature of the fluid
4. Increase the velocity of flow

Q. Water when cools from $4^{\circ }$C to $0^{\circ }$C, contracts.

1. True
2. False

Q.

The biotic community interacts with its abiotic environment to form an ecosystem.

1. False

2. True

Q. The poisonous gases emit from the vehicle mainly includes carbon monoxide, nitrogen dioxide and _____________.

1. oxygen
2. hydrogen
3. sulfur dioxide
4. nitrogen

Q.

The elements which help maintain and regulate living life on earth are defined as environment regulators.

1. True

2. False

Q. The calorific values of wood, bituminous coal, natural gas and charcoal vary in the order:

1. Wood > Bituminous coal > Natural gas > Charcoal
2. Wood > Bituminous coal > Charcoal > Natural gas
3. Natural gas > Charcoal > Bituminous coal > Wood
4. Natural gas > Bituminous coal > Wood > Charcoal

Q.

Observe the given figure.

What is the purpose of this experiment?

1. air has mass
2. air has oxygen
3. we can only feel air
4. air is compressible

Q.

An iron needle _______ in water but a ship _________ on water.

Q.

Water from a dropper does not come out unless it is not pressed explain it?