Physics Past Questions and Answers

A train with an initial velocity of 20ms^-1 is subjected to a uniform deceleration of 2ms^-2. The time required to bring the train to a complete halt is

A 40s
B 10s
C 20s
D 5s

Question 1922:

Which of the following electromagnetic waves has the shortest wavelength?

A Visible Light
B Ultraviolet rays
C Infrared rays
D Gamma rays

Question 1923:

A radioactive isotope has a decay constant of 10^-6s^-1.
Calculate its half - life?

A 5.93 x 10⁶s
B 6.93 x 10⁷s
C 6.93 x 10⁹s
D 5.93 x 10⁷s

Question 1924:

Which of the following waves is both transverse and mechanical?

A Water waves
B Radio waves
C Sound waves
D X-rays

Question 1925:

Calculate the temperature of 6 moles of an ideal gas at a pressure of 7.6 x 10⁶Nm^-2 with a volume of 10^-3m³.
[R = 8.3jmol^-1K^-1]

A 201^oC
B 126^oC
C 153^oC
D 185^oC