1. The principle of transmissibility of forces states that, when a force acts upon a body, its effect ?

same at every point on its line of action

different at different points on its line of action

minimum, if it acts at the centre of gravity of the body

maximum, if it acts at the centre of gravity of the body

Answer: minimum, if it acts at the centre of gravity of the body

Explanation:


2. A smooth cylinder lying on a .......... is in neutral equilibrium ?

curved surface

convex surface

horizontal surface

any surface

Answer: horizontal surface

Explanation:


3. The centre of gravity of a quadrant of a circle lies along its cent al radius (r) at a distance of ?

0.5 r

0.6r

0.7r

0.8r

Answer: 0.6r

Explanation:


4. Which of the following statement is correct ?

The algebraic sum of the forces, constituting the couple is zero

The algebraic sum of the forces, constituting the couple, about any point is the same.

A couple cannot be balanced by a single force but can be balanced only by a couple of opposite sense

all of the above

Answer: all of the above

Explanation:


5. If P is the force acting on the body, m is the mass of the body and a is the acceleration of the body, then according to Newton's second law of motion ?

P+ma=0

P-m.a=0

Pxm.a=0

P/m.a=0

Answer: P-m.a=0

Explanation:


6. If a body is acted upon by a number of coplaner non-concurrent forces, it may ?

rotate about itself without moving

move in any one direction rotating about itself

be completely at rest

all of these

Answer: all of these

Explanation:


7. A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act ?

towards the wall at its upper and

away from the wall at its upper end

downward at its upper end

upward at its upper end

Answer: upward at its upper end

Explanation:


8. Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base, is........than that passing through its C.G. and parallel to the base ?

nine times

six times

four times

two times

Answer: nine times

Explanation:


9. The total momentum of a system of masses (i.e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called ?

Newton's first law of motion

Newton's second law of motion

principle of conservation of energy

principle of conservation of momentum D

Answer: principle of conservation of momentum D

Explanation:


10. A differential pulley block has larger and smaller diameters of 100 mm and 80 mm respectively. Its velocity ratio is ?

5

10

20

40

Answer: 10

Explanation: