Physics Mcqs

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

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

The current through a metallic conductor is due to the motion of _________________?

• (A)  free electrons
• (B)  protons
• (C)  neutrons
• (D)  still under controversy

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

The beats frequency (sensible) for a human car is _____________________?

• (A)  42Hz
• (B)  7 Hz
• (C)  256Hz
• (D)  262Hz

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

The dimension of elastic modulus is ___________________ ?

• (A)  ML-1T-2
• (B)  ML-2T-2
• (C)  MLT-2
• (D)  ML2T-2

Answer

Submitted By :Ali Uppal