Question: A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is_________________?

• 1. 0°
• 2. 30°
• 3. 45°
• 4. 60°

Question: A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t – 4), the acceleration of the particle will be given by the equation_________________?

• 1. 3t2-lt
• 2. 3t2+2t
• 3. 6f-8
• 4. 6f-4

Question: Pick up wrong statement about friction force for dry surfaces. Friction force is________________?

• 1. proportional to normal load between the surfaces
• 2. dependent on the materials of contact surface
• 3. proportional to velocity of sliding
• 4. independent of the area of contact surfaces

Question: Frictional force encountered after commencement of motion is called________________?

• 1. post friction
• 2. limiting friction
• 3. kinematic friction
• 4. dynamic friction

Question: On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be__________________?

• 1. towards the wall at its upper end
• 2. away from the wall at its upper end
• 3. upwards at its upper end
• 4. downwards at its upper end

Question: The ratio of limiting friction and normal reaction is known as_______________?

• 1. coefficient of friction
• 2. angle of friction
• 3. angle of repose
• 4. sliding friction

Question: The coefficient of friction depends on_________________?

• 1. area of contact
• 2. shape of surfaces
• 3. strength of surfaces
• 4. nature of surface

Question: The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, – ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be_________________?

• 1. 20 kg, – ve sense
• 2. 20 kg, + ve sense
• 3. 10 kg, + ve sense
• 4. 10 kg, – ve sense

Question: In the equation of virtual work, following force is neglected_______________?

• 1. reaction of any smooth surface with which the body is in contact
• 2. reaction of a rough surface of a body which rolls on it without slipping
• 3. reaction at a point or an axis, fixed in space, around which a body is con-strained to turn
• 4. all of the above

Question: A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span________________?

• 1. 2.5 cm
• 2. 3.0 cm
• 3. 4.0 cm
• 4. 5.0 cm