  ## Applied Mechanics MCQ Practice Questions (Civil Engineering) Set 6

##### When a body falls freely under gravitational force, it possesses:

Options are :

• No effect on its weight
• Maximum weight
• Minimum weight
• No weight

Options are :

• Pole
• Moon
• Earth
• Sun

##### The motion of a bicycle wheel is:

Options are :

• Rotary and translatory
• Curvilinear
• Translatory
• Rotary

Options are :

• C
• E
• A
• D
• B

Options are :

• b^(4)/8
• b^(3)/4
• b^(4)/3
• b^(4)/12
• b^(4)/36

Options are :

• D
• A
• C
• E
• B

Options are :

• A
• C
• D
• B

Options are :

• P + Q
• P/Q
• Q - P
• P - Q
• Q/P

##### The characteristic of a couple, is:

Options are :

• Algebraic sum of moments of forces, constituting a couple, about any poin, is same
• A couple can be never the balanced by a single force
• A couple can be balanced only by a couple but of opposite sense
• All the above
• Algebraic sum of forces, constituting a couple is zero

Options are :

• B
• A
• C
• D

##### A spring scale in a stationary lift shows a reading of 60 kg for a man standing on it. If the lift starts descending at an acceleration of g/5, the scale reading would be:

Options are :

• 60 kg
• 72 kg
• 48 kg
• None of these

##### Effect of a force on a body depends upon its:

Options are :

• Direction
• Position
• Magnitude
• All the above

Options are :

• C
• A
• D
• B

Options are :

• ?gr
• Infinite
• ?2gr
• Zero

Options are :

• 0.5 m/sec
• 1.5 m/sec
• 4.5 m/sec
• 3.5 m/sec
• 2.5 m/sec

##### For a body moving with simple harmonic motion, the number of cycles per second, is known as its:

Options are :

• Periodic time
• Frequency
• Amplitude
• Oscillation
• Beat

##### A 50 kg boy climbs up a 8 m rope in gymnasiam in 10 sec. The average power developed by the boy is approximately:

Options are :

• 4000 watts
• 400 watts
• 500 watts
• None of these

##### A Seconds pendulum executes:

Options are :

• 3 beats per second
• 2.5 beats per second
• 0.5 beat per second
• 2.0 beats per second
• 1.0 beat per second

Options are :

• 1.50
• 0.40
• 1.00
• 0.67
• 0.50

Options are :

• Momentum
• Interia
• Weight
• Mass

##### Ball A of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/s hits an identical stationary ball B on the tableIf the impact is perfectly elastic, the velocity of the ball B just after impact would be:

Options are :

• 10 m/sec
• None of these
• 5 m/sec
• Zero

Options are :

• 3 sec
• 4 sec
• 5 sec
• 6 sec
• 2 sec

##### For maximum range of a projectile, the angle of projection should be:

Options are :

• 45�
• None of these
• 60�
• 30�

Options are :

• 70%
• 25%
• 65%
• 60%

##### Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation:

Options are :

• bears a constant ratio to their velocity of approach
• is equal to the sum of their velocities of approach
• is inversely proportional to their velocity of approach
• is directly proportional to their velocity of approach

Answer :bears a constant ratio to their velocity of approach

##### Pick up the incorrect statement from the following. In case of suspension bridge due to rise in temperature:

Options are :

• Dip of the cable increases
• None of the these
• Dip of the cable decreases
• Length of the cable increases

Answer :Dip of the cable decreases

##### Which one of the following laws is not applicable to a simple pendulum ?

Options are :

• The time period is proportional to ?l where l is length
• The time period is inversely proportional to ?g where g is the acceleration due to gravity
• The time period does not depend on its magnitude
• The time period is proportional to its length /

Answer :The time period is proportional to its length /

Options are :

• A
• C
• D
• B

##### The following factor affects the orbit of a satellite up to an altitude of 720 km from the earth's surface:

Options are :

• Uneven distribution of the gravitational field
• Gravity of the sun and the moon
• None of these
• Aerodynamic forces

Options are :

• C
• A
• B
• D