A ball is thrown towards the earth and bounce back. During this process:
A. Direction of velocity and acceleration changes
B. Direction of Displacement and acceleration changes
C. Direction of Displacement and Velocity changes
D. Direction of Displacement, Velocity and acceleration changes
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