RRB JE 2015-28-09-2015-3 RRB Question Paper

RRB JE 2015 Question Papers

RRB JE 2015-28-09-2015-3 RRB Questions

41.
Economic saving of time results by crashing
A.
Cheapest critical activity
B.
Cheapest non critical activity
C.
Costliest critical activity
D.
Costliest non critical activity
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ANSWER :
A. Cheapest critical activity
42.
Which one of the following does not react with concrete?
A.
Sewage water
B.
Sulphuric acid
C.
Vegetable oil
D.
Alcohol
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ANSWER :
D. Alcohol
43.
The porosity of a soil sample having its void ratio equal to unity would be
A.
33.34%
B.
50.0%
C.
66.66%
D.
75.0%
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ANSWER :
B. 50.0%
44.
What is the angle between two plane mirrors of an optical square?
A.
30
B.
60
C.
45
D.
90
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ANSWER :
C. 45
45.
Theodolite is an instrument used for
A.
Tightening the capstan-headed nuts of level tube
B.
Measurement of horizontal angles only
C.
Measurement of vertical angles only
D.
Measurement of both horizontal and vertical angles
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ANSWER :
D. Measurement of both horizontal and vertical angles
46.
An aeroplane works on
A.
Archimedes principle
B.
Pascal's law
C.
Bernoulli's principle
D.
Stoke's law
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ANSWER :
C. Bernoulli's principle
47.
In 3 phase power measurement by two wattmeter method, the reading of one wattmeter is zero. The power factor of load is
A.
1
B.
0.5
C.
0
D.
0.8
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ANSWER :
B. 0.5
48.
In a CRO which of the following is not a part of electron gun
A.
cathode
B.
grid
C.
accelerating anode
D.
X - Y plates
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ANSWER :
D. X - Y plates
49.
In a strain measuring device using a strain gauge, the output quantity is
A.
voltage
B.
resistance
C.
impedance
D.
Current
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ANSWER :
A. voltage
50.
Potentiometer method of dc voltage measurement is more accurate than direct measurement using a voltmeter because
A.
it loads the circuit to maximum extent
B.
it loads the circuit moderately
C.
it does not load the circuit at all
D.
it uses centre zero galvanometer instead of Voltmeters
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ANSWER :
C. it does not load the circuit at all