NDA questions
2827 published questions with worked solutions.
- What is the degree of the following differential equation? x= 1+ d^2y dx^2
- Which one of the following differential equations has the general solution y=ae^x+be^ -x ?
- What is the solution of the following differential equation? ( dy dx )+y=x
- What is e^ (2 x+ x^2) dx equal to?
- Consider the following measures of central tendency for a set of N numbers : 1. Arithmetic mean 2. Geometric mean Which of the...
- The coefficient of correlation is independent of
- If M is the mean of n observations x_1-k, x_2-k, x_3-k, , x_n-k, where k is any real number, then what is the mean of x_1, x_2,...
- What is the sum of deviations of the variate values 73, 85, 92, 105, 120 from their mean?
- Let x be the HM and y be the GM of two positive numbers m and n. If 5x=4y, then which one of the following is correct?
- If the mean of a frequency distribution is 100 and the coefficient of variation is 45%, then what is the value of the variance?
- Let two events A and B be such that P(A)=L and P(B)=M. Which one of the following is correct?
- For which of the following sets of numbers do the mean, median and mode have the same value?
- The mean of 12 observations is 75. If two observations are discarded, then the mean of the remaining observations is 65. What is...
- If k is one of the roots of the equation x(x+1)+1=0, then what is its other root?
- The geometric mean of a set of observations is computed as 10. The geometric mean obtained when each observation x_i is replaced...
- If P(A B)= 5 6 , P(A B)= 1 3 and P( A )= 1 2 , then which of the following is/are correct? 1. A and B are independent events. 2....
- A coin is tossed twice. If E and F denote occurrence of head on first toss and second toss respectively, then what is P(E F)...
- If the mode of the scores 10, 12, 13, 15, 15, 13, 12, 10, x is 15, then what is the value of x?
- If A and B are two events such that P(A)= 3 4 and P(B)= 5 8 , then consider the following statements : 1. The minimum value of...
- If x^2+x+1=0, then what is the value of x^ 199 +x^ 200 +x^ 201 ?