Explanation

The sentence should read: "The contractor insisted that he will complete the work before the end of March."

This indicates the contractor's commitment to finishing the work by the specified deadline.

Explanation

Let's calculate the number of skilled employees (x) and unskilled employees (y):

Total salary of skilled employees = 520x

Total salary of unskilled employees = 420y

Total salary of all employees = 500(x + y)

Since the average salary is Rs. 500, we can set up the equation:

520x + 420y = 500(x + y)

Solving for x and y, we get:

x = 0.6(x + y)

So, the percentage of skilled employees is:

(0.6(x + y) / (x + y)) × 100 = 60%

Therefore, 60% of the employees in the firm are skilled.

Explanation

The verb "rush" should be in the past tense ("rushed") to match the past tense of the sentence.

Correct sentence: "When the army realized that they had been fooled, they rushed back."

Explanation

WHO coordinates global vaccination efforts and campaigns.

WHO's immunization program aims to protect people of all ages against vaccine-preventable diseases.

It has been instrumental in global efforts to eradicate smallpox and polio.

Explanation

Herpes zoster vaccine is also known as Shingrix.

It is commonly given to prevent shingles, a viral infection that causes a painful rash.

It is caused by the reactivation of the varicella-zoster virus.

Explanation

A Vaccine Vial Monitor (VVM) is a small sticker or label attached to vaccine vials.

It indicates whether the vaccine has been stored at the correct temperature.

It helps healthcare workers determine the potency and safety of the vaccine.

Explanation

In the Expanded Program on Immunization (EPI), MMR vaccine is used to protect against measles, mumps, and rubella (German measles).

MMR vaccine is typically administered in two doses.

At 9-12 months and 16-24 months of age, to provide protection against these three diseases.

Explanation

IgM antibodies are produced in response to polysaccharide antigens, like pneumococcal bacteria, without prior exposure or immune activation.

Pneumococcal capsular polysaccharide is a T-independent antigen, stimulating an IgM-dominated response without T cell involvement.

Explanation

Penta vaccine is a combination of five vaccines: Diphtheria, Tetanus, Pertussis, Hib, and Hepatitis B.

If a child has received the first dose of Penta vaccine.

The second dose should also be Penta vaccine, as it is a primary immunization series.

Explanation

BCG (Bacille Calmette-Guérin) vaccine is administered intradermally.

It typically on the left upper arm, to children to protect against tuberculosis.

Intradermal administration means the vaccine is injected into the top layer of skin, which helps to stimulate an immune response.