# A particle having almost zero mass and exactly zero charge is

- Positron
- Electron
- Neutron
- Neutrino

# The angular momentum of the earth is about 10^{23} kg-m^{2}/sec. Approximately what is the angular momentum quantum number of the earth in its orbit around the sun? (h/2π ≈ 10 joules-sec)

# Zener diode work on

- Forward bias
- Reverse bias
- Zero bias
- Infinite bias

# Disregarding the type of atoms involved, in any gas held at the same temperature. The atoms will have the same value of

- Kinetic energy
- Potential energy
- Total energy
- Velocity

# Which of the following particle has the mass closest in value to that of the positron

- Proton
- Electron
- Photon
- Neutron

# If the length of a simple pendulum is reduced to half and mass is doubled then the time period of simple is

- Remains unchanged
- Halved
- Doubled
- Decreased by a factor of

# The center of mass of velocity is defined by

# A bob of mass m is moving in XY-plane as a simple pendulum. Its Lagrangian function is:

# At what speed the mass of a body will be almost doubled?

- 0.66 c
- 0.77 c
**0.87 c**- 0.97 c
- None of these