Physics Past Questions and Answers

The electrochemical equivalent of silver is 0.0012gC^-1. If 36.0g of silver is to be deposited by electrolysis on a surface by passing a steady current for 5.0mins, the current must be

A 6000A
B 100A
C 10A
D 1A

Question 32:

When a radiation strikes a metal surface, electrons may be ejected from the metal. The maximum kinetic energy which may be acquired by an ejected electron depend on the

A Intensity of the radiation
B Source of the radiation
C Wavelength of the radiation
D Detection device of the electron

Question 33:

Which of the following is TRUE of the particles emitted in radioactive disintegration?

A The alpha particle is the helium nucleus H
B The alpha particle is lighter than the beta particle
C The alpha particle is deflected more than the beta particle in a magnetic field
D The beta particle is deflected more than the alpha particle in a magnetic field

Question 34:

Eight alpha decays and six beta decays are necessary before an atom of 2 \(^{238}_{92}U\) achieves stability. The final product in the chain has an atomic number of

A 70
B 78
C 82
D 90

Question 35:

An object is placed at 5.6 x 10^-4m in front of a converging lens of focal length 1.0 x 10^-nm. The image formed is

A Real, Erect and magnified
B Virtual, erect and magnified
C Real, inverted and magnified
D Virtual, erect and diminished