Indian Army Nursing Assistant Mock Test - 10 - Indian Army Nursing Assistant MCQ

• The radioactivity of uranium was discovered in 1896 by Henri Becquerel.
• Though it was Henri Becquerel that discovered radioactivity, it was Marie Curie who coined the term.

Additional Information: Marie Curie became the first woman to be awarded the Nobel prize and the first person to obtain two Nobel prizes when she won the prize for the discovery of Polonium and Radium in 1911.

Here, u = 0

We have, v² = u² + 2gh

= 20 m/s

Let the total distance covered by the particle be 2s. Then

Change in momentum = 0.15 x 12 - (-0.15 x 12)
= 3.6 N s

We can derive Newton’s third and first laws from the second law.

The correct option is C third and first laws from the second law
We can derive Newton's third and first laws from second law. If force on particle is zero, then according to Newton's second law

F=ma

0=ma

a=0 (Since mass cannot be zero)
So, this shows that the body moves with constant velocity or remains at rest if no external force on the system. This is the statement of first law itself.

Suppose an isolated system of two bodies A and B. Suppose A exerts force F₁ on B and B exerts F₂ on A. Now, rate of change of momentum of A is dp₁/dt and that of B is dp₂/dt. Therefore, from second law,

F₁=dp₁/dt …(i)

F₂=dp₂/dt …(ii)

Adding (��) and (����), we get

F₁+F₂=dp₁/dt+dp₂/dt

Since the system is isolated, so the total change in momentum or rate of change of momentum dp₁/dt+dp₂/dt should be zero. Thus, F₁+F₂=0 or F₁=−F₂.This is the statement of third law.

Rusting of iron is a chemical change because it happens due to a chemical reaction between iron and air in presence of moisture.

Rusting of iron is an example of a chemical change because it involves a chemical reaction between iron, oxygen, and moisture to form a new substance, iron oxide (rust). This process changes the chemical composition of the iron, and the change is irreversible under normal conditions.

In contrast:

• Heating of an iron rod (1) is a physical change as it only increases the temperature of the iron without changing its chemical structure.
• Melting of wax (2) is also a physical change as it changes the state of the wax from solid to liquid without altering its chemical composition.
• Woollen yarn to knitted sweater (4) is a physical change as it involves changing the shape and form of the yarn without changing its chemical properties.

When a metal react with acid then hydrogen gas evolve, in this way evolution of gas occurs during chemical reaction. When sodium react with cold water then hear is released, even it also catch fire. Wgen iron react with copper sulphate then copper is displaced by iron and change the colour of solution.

Law of conservation of mass states that mass can neither be created nor be destroyed in a chemical reaction. Or we can say that the total mass present in LHS must be equal to the RHS.

River and lake are common source of drinking water. Sea and ocean water are salty and cannot be used for drinking purpose.

The hydride of Oxygen, i.e., H₂O is a colourless, odourless liquid while the hydrides of all the other group 16 elements are unpleasant, foul smelling, poisonous gases. H₂O has the highest boiling point of 373 K amongst the hydrides of group 16 elements.

The substance that loses electrons in a redox reaction is called the reducing agent.

The process of converting vegetable oils into solid fats is called hydrogenation. It involves the addition of hydrogen gas to unsaturated fats to make them more saturated and solid at room temperature.

Isobars are the atoms with same mass number but different atomic number.

2H₂O → 2H₂ + O₂
2 x 18 = 36g
36 g of water produces 1 mole of O₂ gas.
180 g of water will produce 180/36 = 5 moles of O₂ gas.

A sigma bond is always stronger than the pi bond. As we know that the bond strength is decided by the extent of orbital’s overlapping. The extent of overlapping is more in sigma bond than in a pi-bond.

Sodium hydroxide (NaOH) is used in the manufacture of soap. It is a strong base that reacts with fats and oils to produce soap through a process called saponification.

The glycocalyx (cell coat) is associated with the outer leaflet of the plasma membrane. It is composed primarily of proteoglycans, which possess polysaccharide side chains. 

• Penguin is a flightless bird which cannot fly at all.
• It move on earth with its legs.

The leaves of mimosa commonly known as touch- me-not plant fold up quickly when touched with a hand. This is an example of response of plants towards changes in their surroundings.

Scurvy is caused due to deficiency of vitamin C. It causes bleeding of gums, tiredness, swelling of joints etc.

Goiter is a deficiency disorder caused by the lack of iodine in the diet. Iodine is required for the production of thyroid hormones, which regulate the body's metabolism. Insufficient iodine leads to an enlarged thyroid gland, resulting in the development of a goiter.