Practice Pakistan's most useful MCQs for competitive exams

In which of the following trusses, the method of substitution is required for determining the forces in all the members of the truss by graphic statics ?

• (A)  howe truss
• (B)  king post truss
• (C)  fink truss
• (D)  warren truss

Answer

Submitted By :Ali Uppal

Coefficient of friction depends on__________________?

• (A)  nature of surfaces only
• (B)  area of contact only
• (C)  both (A) and (B)
• (D)  none of the above

Answer

Submitted By :Ali Uppal

A ladder of weight ‘w’ rests against a smooth vertical wall, and rests on rough horizontal ground, the coefficient of friction between the ladder and the ground being 1/4. The maximum angle of inclination of the ladder to the vertical, if a man of weight ‘w’ is to walk to the top of it safely, is tan’1 x, where x is___________________?

• (A)  1/4
• (B)  1/3
• (C)  3
• (D)  4

Answer

Submitted By :Ali Uppal

The shape of a suspended cable for a uniformly distributed load over it is__________________?

• (A)  circular
• (B)  parabolic
• (C)  catenary
• (D)  cubic parabola

Answer

Submitted By :Ali Uppal

A light rope is loaded with many equal weights at equal horizontal intervals. The points of suspension on the rope lie on a_____________________?

• (A)  parabola
• (B)  catenary
• (C)  cycloid
• (D)  ellipse

Answer

Submitted By :Ali Uppal

A ball moving on a smooth horizontal table hits a rough vertical wall, the coefficient of restitution between ball and wall being 1/3. The ball rebounds at the same angle. The fraction of its kinetic energy lost is___________________?

• (A)  1/3
• (B)  2/3
• (C)  1/9
• (D)  8/9

Answer

Submitted By :Ali Uppal

A ball is dropped from a height of 16 m on a horizontal floor. If it rebounds to a height of 9 m after striking the floor, the coefficient of restitution between ball and floor is_____________________?

• (A)  1/4
• (B)  2/3
• (C)  3/4
• (D)  4/3

Answer

Submitted By :Ali Uppal

When a body slides down an inclined surface, the acceleration of the body is given by__________________?

• (A)  g
• (B)  gsinG
• (C)  g cos 6
• (D)  g tan 6

Answer

Submitted By :Ali Uppal

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______________________?

• (A)  3/4
• (B)  4/5
• (C)  5/3
• (D)  3/5

Answer

Submitted By :Ali Uppal

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____________________?

• (A)  20 m/sec
• (B)  30 m/sec
• (C)  40 m/sec
• (D)  50 m/sec

Answer

Submitted By :Ali Uppal