Can you ace these Cross River state Civil Service Past Questions? Start honing your skills with some past questions practice and get a preview of what you can expect on test day.
We pulled these Cross River State Civil Service questions from our study pack Cross River State Civil Service Past Question And Answers study pack Each sample question includes correct answers, so you can see how to crack it!
- Mathematics,
- English Language
- General paper/ Current Affairs
Free Sample Cross River state civil service Practice questions and answers
1. The arithmetic mean of all possible outcomes is known as
(A) expected value
(B) critical value
(C) variance
(D) standard deviation
Answer: A
Expectation (or expected value) is the arithmetic mean of all possible outcomes of a random variable.
2. Which of the following cannot be the value of a correlation coefficient?
(A) –1
(B) –0.75
(C) 0
(D) 1.2
Answer: D
The value of a correlation coefficient is always between –1 and 1, including –1 and 1.
3. Var (X) = ?
(A) E[X2] (B) E[X2] – E[X] (C) E[X2] + E[X]2
(D) E[X2] – E[X]2
Answer: D
By definition, Var (X) = E[X2] – E[X]2
4. Var (X + Y) = ?
(A) E[X/Y] + E[Y] (B) E[Y/X] + E[X] (C) Var(X) + Var(Y) + 2 Cov(X, Y)
(D) Var(X) + Var(Y) – 2 Cov(X, Y)
Answer: C
By definition, Var (X + Y) = Var(X) + Var(Y) + 2 Cov(X, Y)
5. What is variance of the data set: 2, 10, 1, 9, and 3?
(A) 15.5
(B) 17.5
(C) 5.5
(D) 7.5
Answer: B
First calculate the mean
Now calculate the variance,
ENGLISH
1. Tunde and Tania went shopping, but __________ couldn’t find anything __________ liked.
(A) they, those
(B) they, them
(C) those, they
(D) they, they
The answer is: (D)
2. Nuclear energy is __________ dangerous to be used widely.
(A) so
(B) such
(C) too
(D) that
The answer is: (C)
3. If I have money, I __________ it tomorrow.
(A) will purchase
(B) would purchase
(C) have purchase
(D) have purchased
The answer is: (A)
4. Cannon had __________ unique qualities _________ it was used widely in ancient times.
(A) such, that
(B) such, so
(C) that, since
(D) that, that
The answer is: (A)
GENERAL
1. The oldest news agency in the world is
(A) AFP
(B) WAFA
(C) BBC
(D) CNN
The answer is: (A)
2. AFP is a renowned news agency of which country?
(A) Switzerland
(B) France
(C) Germany
(D) Sweden
The answer is: (B)
3. How many electoral votes are required in the US presidential elections to become president of the United States?
(A) 250
(B) 270
(C) 350
(D) 370
The answer is: (B)
4. Currently, the largest economy in the world is the economy of
(A) China
(B) Russia
(C) Germany
(D) United States
The answer is: (D)
5. Which state of the United States shares marine border with Russia?
(A) Florida
(B) Hawaii
(C) Georgia
(D) Alaska
The answer is: (D)
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