Saleha Pervez, Mansi Garg and, Poonam Singh Solutions for Chapter: Practice Set, Exercise 5: ANALYSE YOURSELF

Consider the following statements:

1. Taking into account, the fact that any object which floats must have an average density less than that of water during World War 1, a number of cargo vessels were made of concrete.

2. Concrete cargo vessels were filled with air.

3. A ship floats higher in the water on a high-pressure day than on a low-pressure day.

4. Floating of the ship in the water is not possible because of the buoyancy force which is present due to pressure difference.

Which of the statements given above are correct?

Which of the following is/are the source(s) of radioactive pollution?

1. Production of the nuclear weapon.

2. Decommissioning of nuclear weapons.

3. Mining of radioactive ore.

4. Coal ash.

Select the correct option.

Consider the following statements:

$1$. Rust is formed by the reaction of iron and oxygen in the presence of water or air moisture.

$2$. In saltwater, iron tends to rust more quickly.

Which of the statements given above is/are correct?

Middle-aged Indian women are most vulnerable to osteoporosis because:

1. they have genetically weaker bones.

2. of post-menopausal decline in levels of estrogens.

3. of the increase in levels of calcitonin.

4. deficiency of Ca++ in bones.

Select the correct option:

Transverse waves can propagate_____.

Consider the following gases:

1. Water vapour

2. Nitrous oxide

3. CFC

4. Methane

Which of the gases given above are Green House Gases(GHGs)?

The tissue that involved in transport of food materials in plants is called:

In 2015, the Nobel Prize in Medicine was given to discover a drug ‘Artemisinin’ that has significantly reduced the mortality rates for people suffering from malaria. It was discovered after the failure of which medicine?