Complete the following by choosing the correct answers from the bracket :

(a) A …………… [class I/class II/Class III] lever will always have M.A. > 1.

(b) In a block and tackle system, increase in the weight of the movable block …………… [decreases/does not affect/increases] the efficiency of the pulley system.

(c) If the mass as well as the velocity of a body is doubled then the kinetic energy of the body …………… [is doubled/becomes eight times/becomes four times] the initial kinetic energy.

(d) Unit of power used in mechanical engineering is …………… . [watt/horse power/erg per second]

(e) Two copper wires can have the different …………… [resistivity/resistance] but will have same …………… .[resistance/resistivity]

(a) A class II lever will always have M.A. > 1.

(b) In a block and tackle system, increase in the weight of the movable block decreases the efficiency of the pulley system.

(c) If the mass as well as the velocity of a body is doubled then the kinetic energy of the body becomes eight times the initial kinetic energy.

(d) Unit of power used in mechanical engineering is horse power.

(e) Two copper wires can have the different resistance but will have same resistivity.