Quiz: 03: General Agriculture for Competitive Exam

1. The entomopathogenic nematode *Heterorhabditis* sp. is used for the biological control of which pest?
Rice stem borer
Pea leaf miner
White grub
Coriander aphid
2. *Pectinophora gossypiella* is a well-known pest primarily of which crop?
Cumin
Brinjal
Cotton
Spinach
3. Which of the following is a major insect pest found in stored rice?
*Corcyra cephalonica*
*Tribolium castaneum*
*Callosobruchus* sp.
*Systole albipennis*
4. The coefficient of correlation (r) between X and Y is 0.6, their covariance (Cov(X,Y)) is 4.8, and the variance of X (Var(X)) is 9. What is the standard deviation of Y (SD(Y))?
4.8 / (3 * 0.6)
0.6 / (4.8 * 3)
(4.8 * 0.6) / 3
4.8 / (9 * 0.6)
5. The mean of 20 observations is 25. If 3 is added to each observation, what will the new mean be?
26
28
30
32
6. Which of the following options represents a discrete variable?
Height
Time
Wages paid to workers
Number of children in a family
7. If the first quartile (Q1) is 5, the second quartile (Q2/Median) is 10, and the third quartile (Q3) is 20, what is the Quartile Deviation?
15
25
7.5
30
8. When a change in the value of one variable does not cause any change in the value of another variable, the variables are described as:
Negatively correlated
Directly correlated
Positively correlated
Independent
9. The average of the absolute deviations of observations from a measure of central tendency (like mean or median) is known as the:
Mean deviation
Standard deviation
Coefficient of variation
Range
10. In statistics, variance is defined as:
The square root of the variation of values
The coefficient of variation of values
The reciprocal of the mean of the standard deviation
The square of the standard deviation

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  1. Raj rajni
    Planted on April 28, 2023 at 6:09 pm

    State Haryana ,district sirsa , City ellenabad,pincode 125102