Thermocouples convert___________________?
(A) heat energy into electrical energy
(B) heat energy into light energy
(C) heat energy into mechanical energy
(D) mechanical energy into heat energy
Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f ?
(A) 40 W
(B) 90W
(C) 100W
(D) 120W
Production of heat due to an electric current flowing through a conductor is given by _________________?
(A) Joule effect
(B) Joule Thomsons effect
(C) Comptons effect
(D) Feed back effect
A wire having very high value of conductance is said to be____________________?
(A) very good conductor
(B) moderately good conductor
(C) an insulator
(D) no specific criterion available
The current through a metallic conductor is due to the motion of _________________?
(A) free electrons
(B) protons
(C) neutrons
(D) still under controversy
Fundamental frequency of stationary waves in open pipe is ______________ times the frequency in closed pipe?
(A) One
(B) Two
(C) Four time
(D) None of these
The beats frequency (sensible) for a human car is _____________________?
(A) 42Hz
(B) 7 Hz
(C) 256Hz
(D) 262Hz
Laplace found that the alternate compressions and rarefactions produced in sound waves follows ________________?
(A) isothermal law
(B) adiabatic law
(C) isochoric law
(D) all of the above
Waves produced at the surface of water by a pencil executing vibrating motion if held vertically at a frequency of 50Hz are__________________?
(A) Longitudinal
(B) Transverse
(C) Periodic
(D) both A and C
The dimension of elastic modulus is ___________________ ?
(A) ML-1T-2
(B) ML-2T-2
(C) MLT-2
(D) ML2T-2