RRB JE Electrical solved question paper 2015 | RRB JE Electrical

Ques.101. In two vessel A and B the milk and water are in the ratio 5:4 and 3:5 respectively. The ratio in which these are mixed to obtain new mixture which contians half milk and half water is

1. 9:4
2. 4:9
3. 4:3
4. 3:4

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Ques.102. The speed of car is 54 km/h. The time taken but it in seconds, to cover a distance of 240 m is

1. 12
2. 15
3. 16
4. 18

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Ques.103. A train is moving at a speed of 72 km/h. In 40 seconds it will cover a distance of

1. 900 m
2. 800 m
3. 600 m
4. 550 m

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Ques.104. B can do a piece of work in 30 days. If A and B together can do same work in 12 days, then the number of days required for a alone to do the same work is

1. 20
2. 25
3. 30
4. 32

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Ques.105. P and Q can do a piece of work in 20 days. Q and R in 15 days and R and P in 12 days. The number of days required for P to do the same work is

1. 20
2. 30
3. 40
4. 60

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Ques.106. The average of the first seven whole number is

1. 8
2. 7
3. 3
4. 5

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Ques.107. The average 16 observation is 25 and the average of 24 observation is 30. The average of all 40 observation

1. 26
2. 27
3. 27.5
4. 28

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Ques.108. The sum of the first 21 terms of the AP −20, −18, −16 is

1. 0
2. −4
3. −8
4. 4

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Ques.109. The sum of infinite GP is 6. If the common ratio is 1/3 the first term is

1. 6
2. 4
3. 3
4. 2

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Ques.110. From the top of a tower, the angle of depression of a car on the ground is 60°.  If height of the tower is 40m, the distance of the car from the base of the tower is

1. 20√3
2. 30√3
3. 40√3
4. 40√3/3

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