Civil Engineering MCQs

Page No. 160

A shell travelling with a horizontal velocity of 100 m/sec explodes and splits into two parts, one of mass 10 kg and the other of 15 kg. The 15 kg mass drops vertically downward with initial velocity of 100 m/sec and the 10 kg mass begins to travel at an angle to the horizontal of tan”1 x, where x is______________________?


a3/4

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b4/5

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c 5/3

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d3/5

✓


View Answer 3/5

A shell of mass 100 kg travelling with a velocity of 10 m/sec breaks into two equal pieces during an explosion which provides an extra kinetic energy of 20000 Joules. If the pieces continue to move in the same direction as before, then the speed of the faster one must be____________________?


a20 m/sec

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b30 m/sec

✓


c40 m/sec

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d 50 m/sec

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View Answer 30 m/sec

Two objects moving with uniform speeds are 5 m apart after 1 second when they move towards each other and are 1 m apart when they move in the same direction. The speeds of the objects are____________________?


a2 m/sec and 2 m/sec

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b3 m/sec and 2 m/sec

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c3 m/sec and 3 m/sec

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d4 m/sec and 6 m/sec

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View Answer 3 m/sec and 2 m/sec

The angular speed of a car taking a circular turn of radius 100 m at 36 km/hr will be___________________?


a0.1 rad/sec

✓


b 1 rad/sec

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c 10 rad/sec

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d100 rad/sec

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View Answer 0.1 rad/sec

The condilion for a lifting machine to be reversible is that its efficiency should be_________________?


aless than 50%

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b more than 50%

✓


cmore than 66.67%

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dequal to 100%

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View Answer more than 50%

In a lifting machine with efficiency 60%, an effort of 200 N is required to raise a load of 6 kN. The velocity ratio of the machine is_____________________?


a30

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b 50

✓


c 60

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d80

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View Answer 50

A system of copianar forces acting on a rigid body can be reduced to________________?


aone force only

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bone couple only

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cone force and one couple only

✓


d none of the above

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Force polygon method is applicable for_____________________?


a any copianar force system

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ba system of parallel forces only

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c concurrent copianar force system

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dnon-concurrent copianar force system

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The diagram showing the point of application and line of action of forces in their plane is called____________________?


avector diagram

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bspace diagram

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cforce diagram

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dfunicular diagram

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View Answer space diagram

The bending moment in an arch is proportional to___________________?


avertical ordinate of funicular polygon

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bvertical ordinate of the arch

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c intercept between the arch axis and the funicular polygon

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d none of these

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