Physics Past Questions and Answers

Heat may be transferred by conduction, convention and radiation. By which of these methods does heat travel through vacuum?

A Conduction only
B Convection only
C Radiation only
D All these methods

Question 2167:

The part of the human eye that does similar work as the diaphragm of a camera lens is the

A Ciliary muscles
B Pupil
C Iris
D Retina

Question 2168:

A projectile of mass 4kg is fired vertically and reaches a maximum height of 1m. Calculate the potential energy at the highest point<br/>(g = 10ms\(^{-2}\)

A 1800J
B 1600J
C 600J
D 440J

Question 2169:

The length of the seconds hand of laboratory clock is 0.1m. Calculate the speed at the top of the seconds hand

A 1.05 à— 10\(^{-2}\)ms\(^{-1}\)
B 1.85 × 10\(^{-4}\)ms\(^{-1}\)
C 9.50 à— 10\(^{-1}\)ms\(^{-1}\)
D 5.25 à— 10\(^{-3}\)ms\(^{-1}\)

Question 2170:

Workdone on an object to bring it to a certain point in space is called

A Gravitational potential energy
B Potential energy
C Kinetic energy
D Mechanical energy