Quiz: 03: General Agriculture for Competitive Exam

1. Heterorhabditis sp. Is used for the control of-
A) Rice stem bore
B) Pea leaf miner
C) White grub
D) Coriander aphid

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2. Pectinophora gossypilla is a pest of-
A) Cumin
B) Brinjal
C) Cotton
D) Spinach

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3. In storage major pest of rice is
A) Cercyra Cepnolenica
B) Tribolium castaneum
C) Callosobruhus sp
D) Systole albipennis

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4. The coefficient of correlation between X and Y is 0.6, their covariance is 4.8. The variance of X is 9. Then the standard deviation of Y is –
A) 4.8/3*0.6
B) 0.6/4.8*3
C) 4.8*0.6/3
D) 4.8/9*0.6

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5. The mean of 20 observations is 25. What will be the mean of a new set of observations, if 3 is added to each observation?
A) 26
B) 28
C) 30
D) 32

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6. Which of the following would you regard as a discrete variable
A) Height
B) Time
C) Wages paid to workers
D) Number of children in a family

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7. If Q1 = 5, Q2 = 10 and Q3 = 20, the quartile deviation will be
A) 15
B) 25
C) 7.5
D) 30

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8. When the value of one variable changes while another variable remains constant, it is known as
A) Negative correlation
B) Direct correction
C) Positive correction
D) Independent

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9. The average of the absolute deviations taken from the control value is called as
A) Mean deviation
B) Standard deviation
C) Coefficient of variation
D) Range

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10. Variance is –
A) The square root of variation of values
B) The coefficient of variation of values
C) The reciprocal of mean of standard deviation
D) The square of the standard deviation

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