4171: The average salary of skilled employees in a firm is Rs. 520 and that of the unskilled employees is Rs. 420. If the average salary of both the groups of employees is Rs. 500, then the percentage of skilled employees in the firm is
(a) 50
(b) 20
(c) 80
(d) 70
4172: For the measurement/estimation of which of the following are satellite images/remote sensing data used?
1. Chlorophyll content in the vegetation of a specific location
2. Greenhouse gas emissions from rice paddies of a specific location
3. Land surface temperatures of a specific location
Select the correct answer using the code given below.
(a) 1 Only
(b) 2 and 3 only
(c) 3 only
(d) 1, 2 and 3
4173: Which one of the following laser types is used in a laser printer ?
(a) Dye laser
(b) Gas laser
(c) Excimer laser
(d) Semiconductor laser
4174: What is the number of terms in the series 117, 120, 123, 126,......, 333 ?
(a) 73
(b) 72
(c) 76
(d) 79
4175: Which of the following statements is / are correct regarding vegetative propagation of plants ?
1. Vegetative propagation products clonal population.
2. Vegetative propagation helps in eliminating the virus.
3. Vegetative propagation can be practiced most of the year.
Select the correct answer using the code given below:
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3