Physics Mcqs

An object travels at constant speed around a circle of radius 1.0 m in 2.0 seconds. What is the magnitude of its acceleration?A. 0
B. π2
C. 2 π2
D. 4 π2

 

A football is kicked at 45 degrees with horizontal with K.E of E. Its K.E. at highest point isA. Zero
B. E/2
C. E
D. E/(2)1/2

 

The internal energy of the system increases__________?A. in adiabatic expansion
B. in adiabatic compression
C. in isothermal expansion
D. in isothermal compression

 

What is the ratio of the velocity of sound at 4 atmosphere to that at 1 atmosphere?A. 4 : 1
B. 1 : 1
C. 2 : 1
D. 1 : 2

 

The first overtone of a stretched string of given length is 320 Hz. The first harmonic is_________?A. 320 Hz
B. 640 Hz
C. 160 Hz
D. 480 Hz

 

Two identical metal balls with charges + 2Q and – Q are separated by some distance, and exert a force F on each other. They are joined by a conducting wire, which is then removed. The force between them will now be_________?A. F
B. F/2
C. F/4
D. F/8

 

A million electron are added to a pith ball. Its charge is________?A. – 1.6 × 10–12 coulomb
B. – 1.6 × 10–13 coulomb
C. – 1.6 × 10 –18 coulomb
D. – 1.6 × 10 coulomb

 

A cube of side 5 cm has a charge of 6 C. The surface density of charge is_________?A. 100 C m–2
B. 200 C m–2
C. 300 C m–2
D. 400 C m–2

 

In bringing an electron towards the second electron, the electrostatic potential energy of the systemA. Decreases
B. increases
C. remains the same
D. becomes zero

 

How many electrons per second constitute a current of one micro ampere?A. one electron
B. 10 –6 electrons
C. 106 electrons
D. 6.25 × 1012 electrons