$1)$ A Counter is Reset when

$$a$)$ Its input transitions from Off to ON

b$)$ When the counter gets done

c$)$ When a Reset input is supplied

d$.)$When the Preset equals its Accumulated value

$2)$ Reynolds number is a factor that determines

$$a$)$The density of a liquid

b$)$ The flammability of a liquid

c$.)$ The ease by which a liquid flows through a pipe

d$.)$All of the above

$.$

$3)$ Density of a liquid is affected by

$$a$)$ Temperature

$$b$)$ Compressibility

c$)$ Flow rate

d$)$ All of the above

$$

$4)$ An ultra sonic sensor can measure a level in a container

$$a$)$ By optical means

b$)$ By sending and receiving sound waves

c$)$ Both of the above

$$