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Doctors Medicines MCQs Q&A

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Which of the following statement is correct about the immunity? Statement 1: Innate responses occur rapidly and can generate effector mechanisms that are effective within minutes or hours of infection.  Statement 2: Adaptive immunity takes much longer to become effective, usually over a few days. 
In the following sentence the word principal' occurs three times "The principal (1) aim of the principal (2) of the college was to help build new roads to link the area's principal (3)schools" Indicate the use(s) in which the meaning of the word “Principal is ‘chief or main',
You develop an enterprise application, called XYZApplication that includes a Windows Form presentation layer, middle-tier components for business logic and data access, and a Microsoft SQL Server database.
You are in the process of creating a middle-tier component that will execute the data access routines in your application. When data is passed to this component, the component will call several SQL Server stored procedures to perform database updates. All of these procedure calls run under the control of a single transaction.
The code for the middle-tier component will implement the following objects:
SqlConnection cn = new SqlConnection();
SqlTransaction tr;
If two users try to update the same data concurrently, inconsistencies such as phantom reads will occur. You must now add code to your component to specify the highest possible level of protection against such inconsistencies.
Which code segment should you use?
Read the given statement(s) and conclusions carefully and select which of the conclusions logically follow(s) from the statement(s). Statement: Increased use of medicines puts down the innate healing sense of the body. Conclusions: I) There is an innate healing sense in the body. II) Nowadays, we depend more on external medicine and do not allow the body to repair itself on its own.
Which of the following statements are true? (i) The principal focus of a converging lens is real. (ii) The principal focus of a diverging lens is virtual. (iii) The principal focus of a lens is always along the principal axis.
Given below are four statements- (p) The second principal focus of a lens is the position of the object, real or virtual whose image is at infinity. (q) The second principal focus of a lens is the position of the image, real or virtual whose object is at infinity. (r) The first principal focus of a lens is the position of the object, real or virtual whose image is at infinity. (s) The first principal focus of a lens is the position of the image, real or virtual whose object is at infinity.  Examine the above statements and find which among then are correct. 
The most popularly used dimensionality reduction algorithm is Principal Component Analysis (PCA). Which of the following is/are true about PCA?
1. PCA is an unsupervised method
2. It searches for the directions that data have the largest variance
3. Maximum number of principal components 4. All principal components are orthogonal to each other
Which of the following is NOT a barrier under innate immunity?
Which of the following does NOT contribute to the functions of innate immunity?
Which of the following barriers does not come under innate immunity?