A. 0
B. π2
C. 2 π2
D. 4 π2
Physics
A football is kicked at 45 degrees with horizontal with K.E of E. Its K.E. at highest point is
A. 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
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 system
A. 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