RRB JE electrical practice paper-2 | RRB JE Electrical

Ques.141. Find the projection of

a = i + 2j + k
b = 4i − 4j + 7k

1. 20/12
2. 19/10
3. 19/9
4. 11/12

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Ques.142. If a = i − 2j + 3k and b = 2i − 3j + 5k, then find a × b

1. 4
2. 3
3. 2
4. 0

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Ques.143. Find the centre of the sphere x² + y² + z² + 4x – 8y + 2z = 5

1. (2, 4, 1)
2. (−2, 4, 1)
3. (1, 2, 3)
4. (−1, 2, 4)

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Ques.144. The point (2, 0, −3), (3, 2, −1) and (1, −2, −5) are

1. Straight line
2. Collinear
3. Circle
4. Ellipse

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Ques.145. At 4.40, the hour and the minute’s hand of a clock form an angle of

1. 100°
2. 110°
3. 140°
4. 220°

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Ques.146. An article was bought for Rs.2000 and sold for Rs. 2200. Find the gain%

1. 10%
2. 20%
3. 30%
4. 40%

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Ques.147. √2 + 1/√2 − 1 = ?

1. 3√2
2. √2 + 2
3. 3 + 2√2
4. 2

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Ques.148. Find the value of sin 60° cos 30° + cos 60° sin 30°

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

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Ques.149. The value of cos 30° + sin 60°/1 + cos60° + sin30° is

1. 1
2. 3/2
3. 5/4
4. 9/4

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Ques.150. The value of 2(cos⁴60° + sin⁴30°) − (tan²60 + cot²45°) + 3 sec² 30° is

1. 1/2
2. 1/4
3. 3/2
4. 5/2

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