Physics Past Questions and Answers

Which of the following can be described as high tension transmission?

A High resistance and low voltage
B Low current and high voltage
C High current and low voltage
D High voltage and zero current
E High current and low resistance

Question 12:

All the heat generated in a 5\(\Omega\) resistor by 2A flowing for 30 seconds is used to evaporate 5g of a liquid at its boiling point. Which of the following is the correct value of the specific latent heat of the liquid?

A 120J
B 60Jg^-1
C 120Jg^-1
D 1500J
E 1500Jg^-1

Question 13:

When vibration occurs in air column, the distance between a node and an antinode is equal to

A One-quarter of the wavelength
B One-hall of the wavelength
C The wave length
D Twice the wavelength
E Four-times the wavelength

Question 14:

Which of the following statements is (are) NOT correct? i. pressure changes do not affect the speed of sound in air ii. the velocity of sound increases with temperature iii. the quality of the note depends only on its frequency

A I only
B Ii only
C Iii only
D I and iii
E Ii and iii

Question 15:

Of two identical tuning forks with natural frequency 256Hz, one is loaded so that 4 beats per second are heard when they are sounded together. What is the frequency of the loaded tuning fork?

A 260Hz
B 252Hz
C 248Hz
D 264Hz
E 258Hz