Question 4701:

What of the camera corresponds to the iris of the eye?

A. Shutter
B. Film
C lens
C. Diaphragm
D. Focusing ring

Question 4702:

A car of mass 1000 kg travels with a velocity 45 km/h on a rough road and it is brought to a rest after 10s.
What is the force exerted on the car?

A. 1333 N
B. 1250 N
C. 1282 N
D. 1067 N

Question 4703:

A bridge 100m long weighs 500 kN. A lorry
weighing 100 KN is 25 m from one end of it. Find the force exerted at this support.

A. 350 kN
B. 300 kN
C. 330 KN
D. 325 KN

Question 4704:

What is the kinetic energy of a rock of mass 220 g after it has fallen freely for 5 seconds? g=10m/s².

A. 350J
B. 225 J
C. 275 J
D. 250 J

Question 4705:

When equal masses of iron and water are given equal quantity of heat, the piece of iron becomes much hotter than water after a shorter time because:

A. The specific heat of iron is higher than that of wate
B. The specific heat of iron is lower than that of wate
C. Iron is in solid state while water is in liquid state
D. Heat flows faster in solids