In metals, some electrons from the outer shells of atoms are shared with other atoms, with the result that electrons can freely move from atom to atom through the material. because of this, metals are question 5 options: a) good electrical insulators b) good heat insulators c) good electrical conductors d) good heat conductors e) both a and b f) both c and d

Explanation:

Metals have few number of electrons in their valence shell.

The force with which the nucleus of the metal atom is pulling the electron towards itself is lower on the valence shell because the distance between the nucleus an valence shell is large.

So,there are a lot of free electrons in metals.

When the ends of metals are at different potential,electrons flow from one end to another to balance the potential.This feature of metals allows them to conduct electricity.

Similarly,when the ends of metals are at different temperatures,conduction will take place and electrons are the carriers of conduction.This feature of metals allows them to conduct heat.

So,metals are good conductors of heat and electricity.

it would be c. predictability

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.